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Prof. Leandro Juen
Universidade Federal do Pará, Brazil

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0 Amazon
0 Conservation Biology
0 Stream Ecology
0 Odonata
0 Beta diversity

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Odonata
Beta diversity

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Journal article
Published: 09 August 2021 in Forests
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Changes in natural habitats for human use can alter the distribution of biodiversity, favoring species that are more tolerant to environmental disturbance. Usually, these species comprise clades of habitat generalists, which have biological mechanisms to colonize environments with different environmental conditions. However, such effects are still poorly understood for most biological groups, such as the Amazon odonates. Therefore, this study aims to evaluate the effects of land use along an environmental gradient on the phylogenetic and taxonomic diversity of Odonata in the Amazon. We tested the following hypotheses: In deforested areas (e.g., pasture for cattle, palm plantation, and logging), the Odonata community will be more taxonomically and phylogenetically impoverished than in forested areas. We assume that the modification of the natural habitat causes loss of specialist forest species and favors specialist species of open areas and/or habitat generalists. Data sampling was performed in 195 streams under different land-use types: livestock areas, palm monoculture, timber exploitation, and forest areas taken as reference sites. Our results showed that anthropogenic impacts affected the phylogenetic diversity of odonates and the increase in shrub vegetation was related to the increase in the phylogenetic diversity of communities. On the other hand, shrub vegetation is indicative of disturbed areas, where secondary vegetation predominates, with less canopy cover due to the absence or discontinuity of the native tree cover in these habitats. Nonetheless, species richness and abundance were not related to the effects of anthropogenic land use. Finally, our results suggest that the phylogenetic diversity of Amazonian odonates is related to riparian vegetation structure.

ACS Style

Fernando Geraldo de Carvalho; Leandro Duarte; Gabriel Nakamura; Guilherme Dubal Dos Santos Seger; Leandro Juen. Changes of Phylogenetic and Taxonomic Diversity of Odonata (Insecta) in Response to Land Use in Amazonia. Forests 2021, 12, 1061 .

AMA Style

Fernando Geraldo de Carvalho, Leandro Duarte, Gabriel Nakamura, Guilherme Dubal Dos Santos Seger, Leandro Juen. Changes of Phylogenetic and Taxonomic Diversity of Odonata (Insecta) in Response to Land Use in Amazonia. Forests. 2021; 12 (8):1061.

Chicago/Turabian Style

Fernando Geraldo de Carvalho; Leandro Duarte; Gabriel Nakamura; Guilherme Dubal Dos Santos Seger; Leandro Juen. 2021. "Changes of Phylogenetic and Taxonomic Diversity of Odonata (Insecta) in Response to Land Use in Amazonia." Forests 12, no. 8: 1061.

Primary research paper
Published: 23 June 2021 in Hydrobiologia
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Initial Odonata larval distributions are primarily influenced by adult females at the moment of oviposition. However, after oviposition, the larvae are strongly associated with environmental conditions. In the case of both adults and larvae, anthropogenic disturbances that change these conditions may alter the composition and structure of Odonata assemblages. Therefore, based on the differing environmental requirements of Zygoptera and Anisoptera adults and larvae, together with their morphological and physiological differences, we suspected differing riparian preferences of larvae and adults for each suborder. We evaluated the richness and abundance of Odonata larvae. We hypothesized that Zygoptera larvae would have greater richness and abundance in streams with canopy shading, lower temperature ranges, and high physical habitat heterogeneity. On the other hand, Anisoptera larvae would be more abundant in streams without canopy cover. We sampled 186 headwater stream sites in the Neotropical Savanna along an anthropogenic disturbance gradient and used a model selection approach to test our hypotheses, correlating environmental metrics with Odonata larval richness and abundance. We found higher richness of Zygoptera larvae in shaded sites with canopy cover > 5 m high, whereas bare ground without riparian vegetation was important for Anisoptera richness and abundance. Our results indicated that Odonata larvae follow the same distribution, richness and abundance patterns as adults. Anthropogenic disturbances related to the removal or reduction of riparian vegetation can favor Anisoptera over Zygoptera larval assemblages in streams. Preserving riparian canopy cover is needed to maintain the richness of Zygoptera larvae in Neotropical Savanna streams.

ACS Style

Larissa F. R. Silva; Diego M. P. Castro; Leandro Juen; Marcos Callisto; Robert M. Hughes; Marcel G. Hermes. A matter of suborder: are Zygoptera and Anisoptera larvae influenced by riparian vegetation in Neotropical Savanna streams? Hydrobiologia 2021, 1 -11.

AMA Style

Larissa F. R. Silva, Diego M. P. Castro, Leandro Juen, Marcos Callisto, Robert M. Hughes, Marcel G. Hermes. A matter of suborder: are Zygoptera and Anisoptera larvae influenced by riparian vegetation in Neotropical Savanna streams? Hydrobiologia. 2021; ():1-11.

Chicago/Turabian Style

Larissa F. R. Silva; Diego M. P. Castro; Leandro Juen; Marcos Callisto; Robert M. Hughes; Marcel G. Hermes. 2021. "A matter of suborder: are Zygoptera and Anisoptera larvae influenced by riparian vegetation in Neotropical Savanna streams?" Hydrobiologia , no. : 1-11.

Journal article
Published: 22 June 2021 in Zootaxa
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The Brazilian fauna of Lestidae contains two genera (Archilestes Selys, 1862 and Lestes Leach in Brewster, 1815) with 14 species, many of which are poorly defined and/or known only by primary literature. To improve the knowledge of the Brazilian species of the genus Lestes we examined 97 specimens pertaining to 11 of the 13 described species. Additionally, a new species is described here in honor to Prof. Dr. Paulo De Marco Júnior: Lestes demarcoi (Holotype and Allotype: Brazil: Amazonas, Manaus, Reserva Adolpho Ducke, Acará trail, 02º55’46” S & 59º58’22” W, 62 m, 13.iv.2009, collected in tandem, U.G. Neiss leg. and deposited in FAAL). Diagnostic illustrations of all species are provided. Color photographs of live individuals of Lestes dichrostigma Calvert, 1909, Lestes forficula Rambur, 1842 and Lestes paulistus Calvert, 1909 are also presented.

ACS Style

F.A.A. Lencioni; U.G. Neiss; S.L. Dutra; K.S. Furieri; L. Juen; J.D. Batista; Diogo S. Vilela. Synopsis of Lestes from Brazil with description of Lestes demarcoi sp. nov. (Zygoptera: Lestidae). Zootaxa 2021, 4990, 511 -541.

AMA Style

F.A.A. Lencioni, U.G. Neiss, S.L. Dutra, K.S. Furieri, L. Juen, J.D. Batista, Diogo S. Vilela. Synopsis of Lestes from Brazil with description of Lestes demarcoi sp. nov. (Zygoptera: Lestidae). Zootaxa. 2021; 4990 (3):511-541.

Chicago/Turabian Style

F.A.A. Lencioni; U.G. Neiss; S.L. Dutra; K.S. Furieri; L. Juen; J.D. Batista; Diogo S. Vilela. 2021. "Synopsis of Lestes from Brazil with description of Lestes demarcoi sp. nov. (Zygoptera: Lestidae)." Zootaxa 4990, no. 3: 511-541.

Article
Published: 25 May 2021 in Aquatic Ecology
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Climatic seasonality provokes considerable variability in the physical conditions of streams. Although few studies have assessed systematically the temporal effects of climate on aquatic communities, the diversity and structure of odonate larval assemblages (suborders Anisoptera and Zygoptera) are predicted to be influenced by seasonality. To evaluate this hypothesis, we tested the predictions that (1) the genera and abundance richness of zygopteran and anisopteran larvae will decrease during periods of high precipitation, (2) the genera richness and abundance of the two suborders will be associated inversely with temperature, and (3) the composition of the zygopteran assemblage will be more affected by seasonality, in particular precipitation, than that of the Anisoptera, whose composition will be influenced primarily by temperature. We collected odonate larvae every three months over a 6-year period at a stream located in the Cerrado–Amazon forest transition zone and compared these data with data on the local climate from the same period. Our results indicate that the seasonal variation in precipitation had a significant effect on the abundance of both odonate suborders, but that, while the anisopteran genera richness was affected by precipitation, the zygopteran richness was not. We showed that temperature affected the abundance of both suborders, but had no effect on genera richness. As we predicted, the composition of the zygopteran larval assemblage was affected more by the climatic variables than the Anisoptera. In addition, while the Zygoptera were affected primarily by precipitation, the Anisoptera were influenced most by temperature. The results indicate that the timing of the emergence of odonate larvae is synchronized with the months preceding the rainy season, when a high density of larvae are recorded, which may reflect a strategy for both the avoidance of the effects of fluctuations in water levels and the exploitation of the relatively abundant food sources found in the terrestrial environment. Temperature also appears to contribute to this synchrony, by either accelerating or delaying the process of larval emergence.

ACS Style

Bethânia Oliveira de Resende; Victor Rennan Santos Ferreira; Leandro Juen; Divino Silvério; Helena Soares Ramos Cabette. Seasonal fluctuations in the structure of the larval odonate community of a stream in the Cerrado–Amazon forest transition zone. Aquatic Ecology 2021, 55, 861 -873.

AMA Style

Bethânia Oliveira de Resende, Victor Rennan Santos Ferreira, Leandro Juen, Divino Silvério, Helena Soares Ramos Cabette. Seasonal fluctuations in the structure of the larval odonate community of a stream in the Cerrado–Amazon forest transition zone. Aquatic Ecology. 2021; 55 (3):861-873.

Chicago/Turabian Style

Bethânia Oliveira de Resende; Victor Rennan Santos Ferreira; Leandro Juen; Divino Silvério; Helena Soares Ramos Cabette. 2021. "Seasonal fluctuations in the structure of the larval odonate community of a stream in the Cerrado–Amazon forest transition zone." Aquatic Ecology 55, no. 3: 861-873.

Journal article
Published: 08 May 2021 in Science of The Total Environment
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The ongoing encroachment of agricultural activities into natural areas is a growing problem for the ecological condition of streams. Stream ecological condition is best measured using both biotic and abiotic parameters that reflect different channel, riparian zone and catchment aspects. Multiple physical-chemical measures of water quality have long been widely used to represent the environmental conditions of water bodies. More recently, physical habitat structure, catchment land use and land cover have been employed to better understand water body conditions. Both water quality and physical habitat structure metrics are usually measured in the field and often have strong predictive power to analyze biological assemblage conditions. On the other hand, remote sensing of catchment land use and land cover provide relatively low-cost environmental information at large spatial extents, minimizing the need for fieldwork and reducing analytical time. Given these considerations, our aim in the present study was to evaluate the degree to which stream environmental conditions could be measured reliably via remote sensing. In particular, we assessed whether a remote sensing index (Normalized Difference Vegetation Index) and land use can be used as reliable surrogates for site habitat condition, channel dimensions, and water quality. We found that our remote sensing variables were not sufficient for predicting stream water quality or habitat structure. Therefore, we recommend using remote sensing indicators only when it is impossible to measure water quality and habitat structure in the field directly.

ACS Style

Karina Dias-Silva; Thiago Bernardi Vieira; Talissa Pio de Matos; Leandro Juen; Juliana Simião-Ferreira; Robert M. Hughes; Paulo De Marco Júnior. Measuring stream habitat conditions: Can remote sensing substitute for field data? Science of The Total Environment 2021, 788, 147617 .

AMA Style

Karina Dias-Silva, Thiago Bernardi Vieira, Talissa Pio de Matos, Leandro Juen, Juliana Simião-Ferreira, Robert M. Hughes, Paulo De Marco Júnior. Measuring stream habitat conditions: Can remote sensing substitute for field data? Science of The Total Environment. 2021; 788 ():147617.

Chicago/Turabian Style

Karina Dias-Silva; Thiago Bernardi Vieira; Talissa Pio de Matos; Leandro Juen; Juliana Simião-Ferreira; Robert M. Hughes; Paulo De Marco Júnior. 2021. "Measuring stream habitat conditions: Can remote sensing substitute for field data?" Science of The Total Environment 788, no. : 147617.

Original article
Published: 22 April 2021 in Austral Entomology
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Interspecific interactions, such as competition, are among the key factors that determine the distribution, abundance and diversity of organisms in natural communities of aquatic ecosystems. However, a marked reduction in the environmental integrity of streams may lead to modifications of the natural dynamics of these communities, including co‐occurrence patterns and body size. In the Amazon, the replacement of forests by production systems is one of the leading causes of alterations to riverine ecosystem. The insects of the order Odonata (dragonflies and damselflies) are predators known to compete for environmental resources but are also sensitive to environmental changes such as those caused by shifts in land use. In this scenario, the present study evaluated species co‐occurrence and body size patterns in adult odonates found at preserved and altered Amazonian streams, to determine whether there are morphological differences among the species that enable their coexistence. During the study, 98 streams in the eastern Amazon region were sampled, and a habitat integrity index (HII) was used to evaluate the integrity of each stream (based on variables such as the condition of the riparian vegetation and channel, and land use). Ten male individuals were selected from each species, and nine morphometric measurements were taken from each individual. A total of 3588 specimens were collected and distributed in nine families, 49 genera and 134 species. We found a non‐random pattern of co‐occurrence in the species of the odonate suborder Zygoptera and a random pattern in the suborder Anisoptera, in both preserved and altered streams. We found morphological divergence between pairs of zygopteran species, in the whole sample and both categories of stream integrity separately. No such morphological divergence was found in the pairs of anisopteran species. The distribution patterns of odonate species are limited by specific environmental processes, especially in preserved environments and in specialists, such as most zygopterans. Zygopteran species have more specific microhabitat requirements, which could explain this pattern, whereas anisopterans prefer open environments, which usually have a greater supply of resources, although there tends to be less microhabitat heterogeneity, which leads to reduced competition. Given this, future studies should use limiting similarity (e.g. morphological attributes) in addition to environmental and spatial factors to better understand the factors structuring these communities. Among these mechanisms, the effects of common ancestry (phylogenetic inertia) and biogeography are important factors that should also be considered in future studies.

ACS Style

José Max B Oliveira‐Junior; Maria Alexandra Teodósio; Leandro Juen. Patterns of co‐occurrence and body size in dragonflies and damselflies (Insecta: Odonata) in preserved and altered Amazonian streams. Austral Entomology 2021, 60, 436 -450.

AMA Style

José Max B Oliveira‐Junior, Maria Alexandra Teodósio, Leandro Juen. Patterns of co‐occurrence and body size in dragonflies and damselflies (Insecta: Odonata) in preserved and altered Amazonian streams. Austral Entomology. 2021; 60 (2):436-450.

Chicago/Turabian Style

José Max B Oliveira‐Junior; Maria Alexandra Teodósio; Leandro Juen. 2021. "Patterns of co‐occurrence and body size in dragonflies and damselflies (Insecta: Odonata) in preserved and altered Amazonian streams." Austral Entomology 60, no. 2: 436-450.

Journal article
Published: 14 April 2021 in Aquatic Conservation: Marine and Freshwater Ecosystems
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ACS Style

Leandro Schlemmer Brasil; André Felipe Alves Andrade; Bruno R. Ribeiro; Zander A. Spigoloni; Leandro Juen; Paulo De Marco. A niche‐based gap analysis for the conservation of odonate species in the Brazilian Amazon. Aquatic Conservation: Marine and Freshwater Ecosystems 2021, 31, 1150 -1157.

AMA Style

Leandro Schlemmer Brasil, André Felipe Alves Andrade, Bruno R. Ribeiro, Zander A. Spigoloni, Leandro Juen, Paulo De Marco. A niche‐based gap analysis for the conservation of odonate species in the Brazilian Amazon. Aquatic Conservation: Marine and Freshwater Ecosystems. 2021; 31 (5):1150-1157.

Chicago/Turabian Style

Leandro Schlemmer Brasil; André Felipe Alves Andrade; Bruno R. Ribeiro; Zander A. Spigoloni; Leandro Juen; Paulo De Marco. 2021. "A niche‐based gap analysis for the conservation of odonate species in the Brazilian Amazon." Aquatic Conservation: Marine and Freshwater Ecosystems 31, no. 5: 1150-1157.

Research article
Published: 09 March 2021 in PLOS ONE
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Odonata can be sampled following different types of protocols. In Brazil, the most used protocol is the scanning in fixed areas method, where a 100-meter transect is delimited in one of the stream margins, subdivided into 20 segments measuring 5 meters. Despite being universally used, the methodological efficiency or limitations of this protocol for Odonata has never been tested. In this scenario, our objective was to assess the efficiency of the sampling protocol to measure the richness and composition of Odonata in three fundamental aspects: the time of sampling and sampling effort over time and space. We show that the best sampling efficiency was achieved in collections performed at noon, in transects measuring 100 meters, requiring at least two samplings in the same location, supporting the procedures traditionally adopted by many studies with the group. While comparing species composition, we did not see any implication between the different treatments on the capture of the local species pool. However, we highlight and discuss some possible methodological flaws when using this protocol to sample specific Odonata groups. We believe the results obtained are fundamental in the inventory of species and to conduct future studies, as well as to aid conservative measures that use the order Odonata as a tool for environmental monitoring.

ACS Style

Joana Darc Batista; Victor Rennan Santos Ferreira; Helena Soares Ramos Cabette; Lourivaldo Amancio de Castro; Paulo De Marco; Leandro Juen. Sampling efficiency of a protocol to measure Odonata diversity in tropical streams. PLOS ONE 2021, 16, e0248216 .

AMA Style

Joana Darc Batista, Victor Rennan Santos Ferreira, Helena Soares Ramos Cabette, Lourivaldo Amancio de Castro, Paulo De Marco, Leandro Juen. Sampling efficiency of a protocol to measure Odonata diversity in tropical streams. PLOS ONE. 2021; 16 (3):e0248216.

Chicago/Turabian Style

Joana Darc Batista; Victor Rennan Santos Ferreira; Helena Soares Ramos Cabette; Lourivaldo Amancio de Castro; Paulo De Marco; Leandro Juen. 2021. "Sampling efficiency of a protocol to measure Odonata diversity in tropical streams." PLOS ONE 16, no. 3: e0248216.

Original paper
Published: 05 March 2021 in Biodiversity and Conservation
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The changes in land use caused by human activities have directly impacted aquatic ecosystems, making these environments some of the most threatened places on the planet. It is increasingly necessary and urgent to develop tools to identify and assess the effects of human impacts on ecosystems and biodiversity. This study aimed to evaluate whether the Zygoptera/Anisoptera ratio can be an effective tool to measure ecological changes in Atlantic Forest streams. Adult Odonata were collected in 42 streams. An environmental integrity index was used as a measure of environmental change. The Zygoptera/Anisoptera ratio was efficient in classifying the state of preservation of streams; therefore, habitats with a proportion equal to or greater than 67 and 52% of richness and abundance of the suborder Anisoptera can be considered altered. Meanwhile, streams representing a proportion of 54 and 67% of richness and abundance of the suborder Zygoptera can be considered little altered or preserved. The proportions of responses were close to the proposals for streams in the Amazon rainforest region. The ease of identifying the specimens in the different suborders of Odonata is practical, enabling the implementation of participatory monitoring with quick responses for monitoring in the aquatic ecosystems assessed in the region. It is important to test the Zygoptera/Anisoptera ratio for a broader validation in biomes where this evaluation has not yet been carried out. In the future, this will enable the implementation of networks for monitoring the integrity of aquatic environments quickly, effectively and at a low cost.

ACS Style

Cintia Ribeiro; Leandro Juen; Marciel E. Rodrigues. The Zygoptera/Anisoptera ratio as a tool to assess anthropogenic changes in Atlantic Forest streams. Biodiversity and Conservation 2021, 30, 1315 -1329.

AMA Style

Cintia Ribeiro, Leandro Juen, Marciel E. Rodrigues. The Zygoptera/Anisoptera ratio as a tool to assess anthropogenic changes in Atlantic Forest streams. Biodiversity and Conservation. 2021; 30 (5):1315-1329.

Chicago/Turabian Style

Cintia Ribeiro; Leandro Juen; Marciel E. Rodrigues. 2021. "The Zygoptera/Anisoptera ratio as a tool to assess anthropogenic changes in Atlantic Forest streams." Biodiversity and Conservation 30, no. 5: 1315-1329.

Journal article
Published: 22 February 2021 in Ecologies
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The accelerated and disordered growth of large urban centers has caused a significant loss of biodiversity and the negative effects are more significant in aquatic environments. Thus, the objective of this study is to assess the effects of environmental change due to urbanization in the abundance and biomass patterns of species belonging to the Zygoptera suborder. We tested the hypothesis that, in altered streams, there will be a predominance of organisms with fast growth and small biomass (r-strategists), and intermediate streams will have an overlapping of r and k-strategists. In control streams, there will be a predominance of k-strategists, with slow growth, decreased abundance, and high biomass. Urban expansion in Amazonian streams will cause loss of Zygoptera species richness. Streams draining urban areas will have higher air temperatures than control streams. Thus, small-sized and less abundant species will be favored. We sampled 15 streams in the metropolitan area of Belém. Sites were classified, using the index of physical habitat integrity, as control, intermediate and altered. Comparisons between biomass and abundance were analyzed using W Statistics. Our analyses showed that: the effects of urbanization cause loss of k-strategists and favors r-strategists, once abundance was placed above biomass; in intermediate environments, contrary to what we expected, there was no overlapping of strategies, once r-strategists were also placed above k-strategists; in control environments, biomass was placed above abundance, suggesting these environments have a predominance of k-strategist species, as we suggested; and we observed increased levels of temperature favor the most abundant species, the ones having generalist biological mechanisms; however, contrary to what we expected, there was no difference in richness. With these results, we reinforce the need for public policies to create or maintain the riparian forest along streams running through urban areas and create or maintain urban parks.

ACS Style

Jhose Brito; Fernando Carvalho; Leandro Juen. Response of the Zygopteran Community (Odonata: Insecta) to Change in Environmental Integrity Driven by Urbanization in Eastern Amazonian Streams. Ecologies 2021, 2, 150 -163.

AMA Style

Jhose Brito, Fernando Carvalho, Leandro Juen. Response of the Zygopteran Community (Odonata: Insecta) to Change in Environmental Integrity Driven by Urbanization in Eastern Amazonian Streams. Ecologies. 2021; 2 (1):150-163.

Chicago/Turabian Style

Jhose Brito; Fernando Carvalho; Leandro Juen. 2021. "Response of the Zygopteran Community (Odonata: Insecta) to Change in Environmental Integrity Driven by Urbanization in Eastern Amazonian Streams." Ecologies 2, no. 1: 150-163.

Primary research paper
Published: 07 February 2021 in Hydrobiologia
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The present study evaluated the effects of habitat quality on the alpha and beta diversity of odonate larvae under conditions of reduced impact and conventional logging. We hypothesized that the variation in the abiotic conditions found in areas of conventional logging would result in a greater loss of alpha and beta diversity in these areas in comparison with areas of reduced-impact logging and native forest. The study area was located in northeastern Pará state, in northern Brazil. We analyzed data from 10 control streams, located in areas of preserved native forest, 11 streams in forest harvested by reduced-impact logging, and nine streams in areas that had been logged conventionally. Environmental factors such as dissolved oxygen, woody debris, water temperature, sediments, and canopy cover were the principal predictors of the diversity of the Odonata. Our results showed that turnover was the principal component structuring beta diversity in the three areas (native forest, reduced impact and conventional logging). The results of the present study indicate that management initiatives based on reduced-impact logging techniques could be adopted to guarantee socio-economic benefits while minimizing the impacts of logging on local biodiversity.

ACS Style

Thiago Pereira Mendes; Luciano Fogaça De Assis Montag; Swanni T. Alvarado; Leandro Juen. Assessing habitat quality on alpha and beta diversity of Odonata larvae (Insect) in logging areas in Amazon forest. Hydrobiologia 2021, 848, 1147 -1161.

AMA Style

Thiago Pereira Mendes, Luciano Fogaça De Assis Montag, Swanni T. Alvarado, Leandro Juen. Assessing habitat quality on alpha and beta diversity of Odonata larvae (Insect) in logging areas in Amazon forest. Hydrobiologia. 2021; 848 (5):1147-1161.

Chicago/Turabian Style

Thiago Pereira Mendes; Luciano Fogaça De Assis Montag; Swanni T. Alvarado; Leandro Juen. 2021. "Assessing habitat quality on alpha and beta diversity of Odonata larvae (Insect) in logging areas in Amazon forest." Hydrobiologia 848, no. 5: 1147-1161.

Journal article
Published: 01 January 2021 in International Journal of Odonatology
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Our study evaluated the effects of environmental variables on the assemblages of the suborder Zygoptera, and tested the hypothesis that environmental variables are more important determinants of the structure of these assemblages than limnological variables in streams. We sampled 17 streams in the Carajás National Forest and tested our hypothesis using a linear regression analysis, with the zygopteran species composition, richness, and abundance as the response variables. Our findings indicate that both limnological and physical variables influence, independently, the characteristics of the zygopteran assemblages. The riparian forest maintains the stability of the environment and provides dispersal corridors, along which the zygopterans can reach alternative, suitable environments. The small scale of this study also implies that the continuity of the vegetation is essential for the dispersal of the zygopterans among different landscapes. The high levels of abundance recorded in the better-preserved environments may reflect the maintenance of specific habitats and resource availability. Riparian forest is crucial to the ecological equilibrium of the stream systems, although further research at a broader spatial scale that focuses on a greater diversity of variables should provide more robust insights into the phenomenon.

ACS Style

Joás Brito; Lenize Calvao; Erlane Cunha; Leandro Maioli; Mayla Barbirato; Samir Rolim; Leandro Juen. Environmental variables affect the diversity of adult damselflies (Odonata: Zygoptera) in western Amazonia. International Journal of Odonatology 2021, 108 -121.

AMA Style

Joás Brito, Lenize Calvao, Erlane Cunha, Leandro Maioli, Mayla Barbirato, Samir Rolim, Leandro Juen. Environmental variables affect the diversity of adult damselflies (Odonata: Zygoptera) in western Amazonia. International Journal of Odonatology. 2021; ():108-121.

Chicago/Turabian Style

Joás Brito; Lenize Calvao; Erlane Cunha; Leandro Maioli; Mayla Barbirato; Samir Rolim; Leandro Juen. 2021. "Environmental variables affect the diversity of adult damselflies (Odonata: Zygoptera) in western Amazonia." International Journal of Odonatology , no. : 108-121.

Research paper
Published: 04 November 2020 in Limnology
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Understanding the role of abiotic and biotic factors on biological communities is a challenge for ecologists. Individuals of the order Odonata have a close connection with these factors, which can influence the establishment of each stages of live. This study evaluated the relationship between habitat complexity and limnological variables on the diversity of Libellulidae larvae and adults. Our hypotheses were that (i) limnological variables would have a greater influence than habitat complexity on larvae and (ii) habitat complexity would influence more adults. Forty-six sampling sites were evaluated in the Brazilian Amazon region. Our results indicated the effects of limnological variables and habitat complexity on both life stages, with higher influence of the first on larvae and the second on adults, mainly for species composition. The abundance of the Eichhornia azurea, which has enormous morphological plasticity, together with the presence of a range of other macrophyte species provides different habitat architectures, with more suitable microhabitats for different odonates. The habitat complexity metrics had combined effects on the larvae, presumably because of the greater availability of refuges from predators and food sources. In contrast, in the adults, the relationship with habitat complexity is associated with the availability of ovipositing sites and perches.

ACS Style

Joás Silva Brito; Thaisa Sala Michelan; Leandro Juen. Aquatic macrophytes are important substrates for Libellulidae (Odonata) larvae and adults. Limnology 2020, 22, 139 -149.

AMA Style

Joás Silva Brito, Thaisa Sala Michelan, Leandro Juen. Aquatic macrophytes are important substrates for Libellulidae (Odonata) larvae and adults. Limnology. 2020; 22 (1):139-149.

Chicago/Turabian Style

Joás Silva Brito; Thaisa Sala Michelan; Leandro Juen. 2020. "Aquatic macrophytes are important substrates for Libellulidae (Odonata) larvae and adults." Limnology 22, no. 1: 139-149.

Report
Published: 01 October 2020 in Science
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Conservation initiatives overwhelmingly focus on terrestrial biodiversity, and little is known about the freshwater cobenefits of terrestrial conservation actions. We sampled more than 1500 terrestrial and freshwater species in the Amazon and simulated conservation for species from both realms. Prioritizations based on terrestrial species yielded on average just 22% of the freshwater benefits achieved through freshwater-focused conservation. However, by using integrated cross-realm planning, freshwater benefits could be increased by up to 600% for a 1% reduction in terrestrial benefits. Where freshwater biodiversity data are unavailable but aquatic connectivity is accounted for, freshwater benefits could still be doubled for negligible losses of terrestrial coverage. Conservation actions are urgently needed to improve the status of freshwater species globally. Our results suggest that such gains can be achieved without compromising terrestrial conservation goals.

ACS Style

Cecília G. Leal; Gareth D. Lennox; Silvio F. B. Ferraz; Joice Ferreira; Toby A. Gardner; James R. Thomson; Erika Berenguer; Alexander C. Lees; Robert M. Hughes; Ralph Mac Nally; Luiz E. O. C. Aragão; Janaina G. de Brito; Leandro Castello; Rachael D. Garrett; Neusa Hamada; Leandro Juen; Rafael P. Leitão; Julio Louzada; Thiago F. Morello; Nárgila G. Moura; Jorge L. Nessimian; José Max B. Oliveira-Junior; Victor Hugo F. Oliveira; Vívian C. de Oliveira; Luke Parry; Paulo S. Pompeu; Ricardo R. C. Solar; Jansen Zuanon; Jos Barlow. Integrated terrestrial-freshwater planning doubles conservation of tropical aquatic species. Science 2020, 370, 117 -121.

AMA Style

Cecília G. Leal, Gareth D. Lennox, Silvio F. B. Ferraz, Joice Ferreira, Toby A. Gardner, James R. Thomson, Erika Berenguer, Alexander C. Lees, Robert M. Hughes, Ralph Mac Nally, Luiz E. O. C. Aragão, Janaina G. de Brito, Leandro Castello, Rachael D. Garrett, Neusa Hamada, Leandro Juen, Rafael P. Leitão, Julio Louzada, Thiago F. Morello, Nárgila G. Moura, Jorge L. Nessimian, José Max B. Oliveira-Junior, Victor Hugo F. Oliveira, Vívian C. de Oliveira, Luke Parry, Paulo S. Pompeu, Ricardo R. C. Solar, Jansen Zuanon, Jos Barlow. Integrated terrestrial-freshwater planning doubles conservation of tropical aquatic species. Science. 2020; 370 (6512):117-121.

Chicago/Turabian Style

Cecília G. Leal; Gareth D. Lennox; Silvio F. B. Ferraz; Joice Ferreira; Toby A. Gardner; James R. Thomson; Erika Berenguer; Alexander C. Lees; Robert M. Hughes; Ralph Mac Nally; Luiz E. O. C. Aragão; Janaina G. de Brito; Leandro Castello; Rachael D. Garrett; Neusa Hamada; Leandro Juen; Rafael P. Leitão; Julio Louzada; Thiago F. Morello; Nárgila G. Moura; Jorge L. Nessimian; José Max B. Oliveira-Junior; Victor Hugo F. Oliveira; Vívian C. de Oliveira; Luke Parry; Paulo S. Pompeu; Ricardo R. C. Solar; Jansen Zuanon; Jos Barlow. 2020. "Integrated terrestrial-freshwater planning doubles conservation of tropical aquatic species." Science 370, no. 6512: 117-121.

Preprint content
Published: 16 September 2020
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We investigated how components of beta diversity (i.e., the turnover and nestedness and functional compositional) aquatic insect assemblages change among sites and are influenced by environmental and spatial drivers. For this, we analyzed beta-diversity and functional composition of Ephemeroptera, Plecoptera, and Trichoptera in 16 streams in two Amazonian basins with distinct environmental conditions (the Carajás and Tapajós regions). We performed Multiple regression on dissimilarity matrices (MRM) and Procrustes analysis to test spatial and environmental influences on the taxonomic and functional composition of communities. Community dissimilarity was most related to variations in geographic distance and topography, which highlighted the environmental distances shaping the communities. Variation in functional composition could be mostly attributed to the replacement of species by those with similar traits, indicating trait convergence among communities. Environmental predictors best-explained species replacement and trait congruence within and between the regions evaluated. In summary, among communities with different taxonomic compositions, the high species replacement observed appears to be leading them to have similar community structure, with species having the same functional composition, even in communities separated by both small and large geographic distances.

ACS Style

Gilberto Nicacio; Erlane José Cunha; Neusa Hamada; Leandro Juen. Contrasting beta diversity and functional composition of aquatic insect communities across local to regional scales in Amazonian streams. 2020, 1 .

AMA Style

Gilberto Nicacio, Erlane José Cunha, Neusa Hamada, Leandro Juen. Contrasting beta diversity and functional composition of aquatic insect communities across local to regional scales in Amazonian streams. . 2020; ():1.

Chicago/Turabian Style

Gilberto Nicacio; Erlane José Cunha; Neusa Hamada; Leandro Juen. 2020. "Contrasting beta diversity and functional composition of aquatic insect communities across local to regional scales in Amazonian streams." , no. : 1.

Journal article
Published: 21 August 2020 in Aquaculture Reports
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The objective of this study was to assess the effect of environmental factors on the microbiological quality of water and oyster flesh (Crassostrea gasar) farmed in two Amazon estuaries in Pará, Brazil. The estuaries were located in the Nova Olinda community in Augusto Corrêa (site 1) and the Lauro Sodré community in Curuçá (site 2). Physicochemical water parameters (the rainfall, salinity, temperature and pH) were evaluated over a one-year period. A total of six liters of water and 720 oyster samples from oyster farms were used to analyze coliforms, Escherichia coli, coagulase-positive staphylococci, molds, yeasts and Salmonella spp. The rainfall and salinity were the environmental factors that most strongly influenced the microbiological quality of the water and oyster flesh. The mean total and thermotolerant coliforms were higher in the farming water from site 2 (Curuçá) than from site 1. The oyster flesh from site 1 (Augusto Corrêa) had higher mean levels of total and thermotolerant coliforms, coagulase-positive staphylococci and molds and yeasts than that from site 2. E. coli was absent from the water and oyster flesh of both sites. Salmonella spp. was found in 38.33 % of oyster flesh with no significant differences across sites and seasonal periods. The water quality was considered good for farming bivalve mollusks. However, the presence of Salmonella spp. in the oyster flesh compromised the sanitary quality and represents a threat to public health. Therefore, depuration facilities and microbiological monitoring are required.

ACS Style

Osnan Lennon Lameira Silva; Samara Maria Modesto Veríssimo; Adrianne Maria Brito Pinheiro da Rosa; Yuri Barbosa Iguchi; Emilia Do Socorro Conceição De Lima Nunes; Carina Martins de Moraes; Carlos Alberto Martins Cordeiro; Diego De Arruda Xavier; Anne Suellen Oliveira Pinto; Maria Regina Sarkis Peixoto Joele; Joás Da Silva Brito; Leandro Juen; Rossineide Martins da Rocha. Effect of environmental factors on microbiological quality of oyster farming in Amazon estuaries. Aquaculture Reports 2020, 18, 100437 .

AMA Style

Osnan Lennon Lameira Silva, Samara Maria Modesto Veríssimo, Adrianne Maria Brito Pinheiro da Rosa, Yuri Barbosa Iguchi, Emilia Do Socorro Conceição De Lima Nunes, Carina Martins de Moraes, Carlos Alberto Martins Cordeiro, Diego De Arruda Xavier, Anne Suellen Oliveira Pinto, Maria Regina Sarkis Peixoto Joele, Joás Da Silva Brito, Leandro Juen, Rossineide Martins da Rocha. Effect of environmental factors on microbiological quality of oyster farming in Amazon estuaries. Aquaculture Reports. 2020; 18 ():100437.

Chicago/Turabian Style

Osnan Lennon Lameira Silva; Samara Maria Modesto Veríssimo; Adrianne Maria Brito Pinheiro da Rosa; Yuri Barbosa Iguchi; Emilia Do Socorro Conceição De Lima Nunes; Carina Martins de Moraes; Carlos Alberto Martins Cordeiro; Diego De Arruda Xavier; Anne Suellen Oliveira Pinto; Maria Regina Sarkis Peixoto Joele; Joás Da Silva Brito; Leandro Juen; Rossineide Martins da Rocha. 2020. "Effect of environmental factors on microbiological quality of oyster farming in Amazon estuaries." Aquaculture Reports 18, no. : 100437.

Journal article
Published: 03 August 2020 in Ecological Indicators
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The use of aquatic insects in ecological studies of oil palm plantations provides an effective evaluation of biodiversity loss caused by changes in habitat. Approaches at the population or community level associated with biomarker analyses might help in the management and conservation of impacted habitats. Our aim was to assess detoxification responses (Glutathione S-transferase activity) of three aquatic invertebrates (Mnesarete aenea, Cylindrostethus palmaris, and Campylocia anceps) in oil palm plantations and forested areas in the Eastern Brazilian Amazon. A total of 20 streams were sampled during the dry season of 2017, in the municipality of Tailândia, Pará – Brazil. The response of this exposure biomarker was related with water temperature, pH, dissolved oxygen, canopy cover and habitat integrity index. The species M. aenea and C. palmaris showed differences in detoxification response induction, with higher specific activity in oil palm areas than in forest areas. The conversion of natural landscape and use of agrochemicals in oil palm plantations might affect the dynamics of organisms that are sensitive to changes in habitat quality. We suggest that differences in Habitat Integrity Index between oil palm and Amazon forest areas is a determining factor in increased GST induction in M. aenea. This result indicates that this organism might act as a sentinel for biomarker evaluations, providing an early warning signal via its biochemical responses that could help to prevent changes at the population and community levels.

ACS Style

Thiago Pereira Mendes; Lílian Lund Amado; Leandro Juen. Glutathione S-transferase activity in Mnesarete aenea (Odonata), Campylocia anceps (Ephemeroptera), and Cylindrostethus palmaris (Hemiptera) from forest and oil palm plantation areas in the Eastern Amazon. Ecological Indicators 2020, 118, 106770 .

AMA Style

Thiago Pereira Mendes, Lílian Lund Amado, Leandro Juen. Glutathione S-transferase activity in Mnesarete aenea (Odonata), Campylocia anceps (Ephemeroptera), and Cylindrostethus palmaris (Hemiptera) from forest and oil palm plantation areas in the Eastern Amazon. Ecological Indicators. 2020; 118 ():106770.

Chicago/Turabian Style

Thiago Pereira Mendes; Lílian Lund Amado; Leandro Juen. 2020. "Glutathione S-transferase activity in Mnesarete aenea (Odonata), Campylocia anceps (Ephemeroptera), and Cylindrostethus palmaris (Hemiptera) from forest and oil palm plantation areas in the Eastern Amazon." Ecological Indicators 118, no. : 106770.

Primary research paper
Published: 02 August 2020 in Hydrobiologia
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Veredas environments play a critical role on the perennialization of streams in the Cerrado Biome, but alterations to their physiognomies are becoming increasingly more common, which directly affects abiotic variation and the structure of biological communities. Our study evaluates the effect of abiotic variations and environmental alterations upon the abundance, richness, and composition of species of semiaquatic bugs, where we test whether there are significant differences in conserved and altered veredas. Species richness was higher on altered veredas and there was no difference in abundance between altered and preserved veredas. The composition of conserved veredas was more homogeneous. Five species were associated with altered veredas and one to conserved areas. There were abiotic changes in the veredas that affected the abundance, richness, and/or composition of Gerromorpha. Ease of access to soil usage and to water for farming activities and pasture might be the main factors contributing to the alteration of veredas in this region. Gerromorpha community structure was modified by the environmental passive in areas of veredas, thus allowing to measure the degree of alterations to these systems, being a useful tool for monitoring and conservation.

ACS Style

Nubia França Da Silva Giehl; Helena Soares Ramos Cabette; Karina Dias-Silva; Leandro Juen; Felipe Ferraz Figueiredo Moreira; Lourivaldo Amâncio De Castro; Victor Rennan Santos Ferreira; Joana Darc Batista. Variation in the diversity of semiaquatic bugs (Insecta: Heteroptera: Gerromorpha) in altered and preserved veredas. Hydrobiologia 2020, 847, 3497 -3510.

AMA Style

Nubia França Da Silva Giehl, Helena Soares Ramos Cabette, Karina Dias-Silva, Leandro Juen, Felipe Ferraz Figueiredo Moreira, Lourivaldo Amâncio De Castro, Victor Rennan Santos Ferreira, Joana Darc Batista. Variation in the diversity of semiaquatic bugs (Insecta: Heteroptera: Gerromorpha) in altered and preserved veredas. Hydrobiologia. 2020; 847 (16):3497-3510.

Chicago/Turabian Style

Nubia França Da Silva Giehl; Helena Soares Ramos Cabette; Karina Dias-Silva; Leandro Juen; Felipe Ferraz Figueiredo Moreira; Lourivaldo Amâncio De Castro; Victor Rennan Santos Ferreira; Joana Darc Batista. 2020. "Variation in the diversity of semiaquatic bugs (Insecta: Heteroptera: Gerromorpha) in altered and preserved veredas." Hydrobiologia 847, no. 16: 3497-3510.

Journal article
Published: 17 July 2020 in Ecological Indicators
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Wing polymorphism is common in insects and is generally associated with environmental variation, thus, this characteristic can express different phenotypes under different environmental cues. Thereby, organisms with a greater dispersal capacity are more related to heterogeneous environments, while wingless organisms have a greater investment in reproduction even in habitats with suboptimal conditions. This study evaluated the efficacy of wing dimorphism in semiaquatic bugs as a tool to assess altered streams in oil palm plantations. We sampled 27 streams in the Eastern Amazon, classified in preserved areas and oil palm plantation areas. The total matrix of sites x species was broken down in two derived matrices, deconstructed in wingless and winged individuals. We evaluated the concordance between the derived matrices and the total matrix by Procrustes analysis. For each dataset, we used the t-test to evaluate the richness loss and model selection to assess the effect of environmental variables on species richness. There was a greater number of winged phenotype organisms in the preserved areas. Only the wingless matrix had a structure congruent with the overall community matrix. However, species loss of both wingless and winged individuals was observed in oil palm plantation areas. Wingless species richness was higher in areas with lower water temperature and a more closed canopy. On the other hand, winged species richness was higher at streams with lower temperature, pH, and depth. Also, our results emphasized the relationship between the expression of the winged phenotype and land use in polymorphic species. The greater abundance of winged individuals in preserved areas points to species such as Cylindrostethus palmaris and Brachymetra lata as potential targets for stream monitoring in the Amazon, as they are easily located and identified with no need for collection. These results suggest the wing polymorphism as a good strategy in environmental monitoring due to the reduction of time and financial costs required, also reducing the diversity loss that occurs in conventional biological collections. Additionally, they highlighted the trade-off between dispersal and reproduction in these areas, thus indicating that the wing polymorphic species life-history strategies can explain the environmental changes and contribute to the management of conservation policies for Amazonian aquatic ecosystems.

ACS Style

Erlane José Cunha; Alana Patricia Meguy Guterres; Bruno Spacek Godoy; Leandro Juen. Wing dimorphism in semiaquatic bugs (Hemiptera, Heteroptera, Gerromorpha) as a tool for monitoring streams altered by oil palm plantation in the Amazon. Ecological Indicators 2020, 117, 106707 .

AMA Style

Erlane José Cunha, Alana Patricia Meguy Guterres, Bruno Spacek Godoy, Leandro Juen. Wing dimorphism in semiaquatic bugs (Hemiptera, Heteroptera, Gerromorpha) as a tool for monitoring streams altered by oil palm plantation in the Amazon. Ecological Indicators. 2020; 117 ():106707.

Chicago/Turabian Style

Erlane José Cunha; Alana Patricia Meguy Guterres; Bruno Spacek Godoy; Leandro Juen. 2020. "Wing dimorphism in semiaquatic bugs (Hemiptera, Heteroptera, Gerromorpha) as a tool for monitoring streams altered by oil palm plantation in the Amazon." Ecological Indicators 117, no. : 106707.

Articles
Published: 14 July 2020 in International Journal of Odonatology
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Nos riachos tropicais a sazonalidade tem forte influência sobre a heterogeneidade, alterando os recursos disponíveis e ocasionando o carreamento de organismos, substrato e matéria orgânica. Provocando mudanças nas variáveis limnológicas, bem como na composição de espécies. O objetivo de nosso trabalho foi avaliar a congruência de resposta da comunidade de Odonata em duas estações sazonais em riachos da transição entre Cerrado e Caatinga. Foram amostrados 10 riachos afluentes do rio Itapecuru em Caxias, no leste do Maranhão nos meses de julho a dezembro de 2017 (menor precipitação) e em janeiro a junho de 2018 (maior precipitação). Um total de 386 espécimes foram coletados sendo 160 na estação de menor precipitação e 226 para a estação de maior precipitação. Não houve congruência de resposta para a ordem Odonata entre as estações, no entanto, para as subordens separadamente, Zygoptera apresentou alta congruência de imaturo, mas não houve para Anisoptera. Assim, em ambientes que enfrentam um forte estresse hídrico e devido as diferenças ecofisiológicas das subordens, a amostragem de apenas um período sazonal não fornece dados consistentes sobre a composição das espécies (Zygoptera apresentou semelhança na composição entre os dois períodos, mas não para Anisoptera), perdendo informações importantes sobre a diversidade local. Se o foco é a biodiversidade, o uso de subordinados pode estabelecer padrões de diversidade e adaptação entre as estações, tendo em vista as diferenças ecofisiológicas existentes.

ACS Style

Lucas Pereira Moura; Sheyla Regina Marques Couceiro; Leandro Juen; Daniel Silas Veras. Congruence of the composition of Odonata between dry and rainy seasons in the Maranhense Cerrado. International Journal of Odonatology 2020, 23, 305 -314.

AMA Style

Lucas Pereira Moura, Sheyla Regina Marques Couceiro, Leandro Juen, Daniel Silas Veras. Congruence of the composition of Odonata between dry and rainy seasons in the Maranhense Cerrado. International Journal of Odonatology. 2020; 23 (4):305-314.

Chicago/Turabian Style

Lucas Pereira Moura; Sheyla Regina Marques Couceiro; Leandro Juen; Daniel Silas Veras. 2020. "Congruence of the composition of Odonata between dry and rainy seasons in the Maranhense Cerrado." International Journal of Odonatology 23, no. 4: 305-314.