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El objetivo de este estudio fue evaluar la colonización de macroinvertebrados y el porcentaje de pérdida de masa seca de hojas de Eucalyptus sp. y Tibouchina lepidota en una quebrada afectada por la actividad minera ubicada en la parte alta de la cuenca del río Chinchiná (Manizales, Colombia). Se seleccionaron dos áreas de muestreo: una reconocida como de referencia al no mostrar evidencia de impactos antropogénicos, y otra con influencia de actividades mineras auríferas. Se utilizaron 192 bolsas con 5 g de hojas senescentes de las especies seleccionadas y de una mezcla (1:1), y se extrajeron cuatro réplicas por punto de muestreo en tiempos predeterminados (+3, 7, 15, 30, 45, 60, 75 y 90 días). Se recolectaron 8.070 individuos distribuidos en ocho órdenes, 24 familias y 34 géneros. En la zona de referencia se obtuvo, comparativamente, una mayor riqueza, densidad y diversidad de macroinvertebrados. Se aspira a que los resultados de este trabajo contribuyen al conocimiento de la dinámica de la colonización de macroinvertebrados acuáticos y su papel en la descomposición de hojas de especies exóticas y nativas en microcuencas altoandinas de Colombia.
Danae Salazar-Castellanos; Ana María Meza-Salazar; Giovany Guevara. Macroinvertebrados y pérdida de masa de hojas de Eucalyptus sp. y Tibouchina lepidota en una quebrada altoandina con influencia minera (Manizales, Colombia). Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales 2020, 44, 593 -605.
AMA StyleDanae Salazar-Castellanos, Ana María Meza-Salazar, Giovany Guevara. Macroinvertebrados y pérdida de masa de hojas de Eucalyptus sp. y Tibouchina lepidota en una quebrada altoandina con influencia minera (Manizales, Colombia). Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales. 2020; 44 (171):593-605.
Chicago/Turabian StyleDanae Salazar-Castellanos; Ana María Meza-Salazar; Giovany Guevara. 2020. "Macroinvertebrados y pérdida de masa de hojas de Eucalyptus sp. y Tibouchina lepidota en una quebrada altoandina con influencia minera (Manizales, Colombia)." Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales 44, no. 171: 593-605.
Here, we have presented a field device for sampling periphyton in lentic systems, with a tropical lowland wetland in Colombia as the model system. The periphyton sampler (PS) is composed of a central soft iron pole to which rectangular woody boxes and glass slides are attached to lateral iron axes, which can be distributed at different depths. Our PS can be used to evaluate changes in the richness and density of algal communities at different scales as well as in water quality studies.
Jonathan Gerardo Gordillo-Guerra; Giovany Guevara; Gladys Reinoso-Flórez. A practical device for evaluating periphyton colonization dynamics in tropical shallow wetlands. Limnologica 2020, 81, 125755 .
AMA StyleJonathan Gerardo Gordillo-Guerra, Giovany Guevara, Gladys Reinoso-Flórez. A practical device for evaluating periphyton colonization dynamics in tropical shallow wetlands. Limnologica. 2020; 81 ():125755.
Chicago/Turabian StyleJonathan Gerardo Gordillo-Guerra; Giovany Guevara; Gladys Reinoso-Flórez. 2020. "A practical device for evaluating periphyton colonization dynamics in tropical shallow wetlands." Limnologica 81, no. : 125755.
Morphological differences between the sexes are a common feature in many groups of animals and can have important ecological implications for courtship, mating, access to prey and, in some cases, intersex niche partitioning. In this study, we evaluated the role of sexual dimorphism in the performance of the two structures that mediate the ability to access prey, the pinchers or chelae and the venomous stinger, in two species of scorpions with contrasting morphologies: Chactas sp., which has marked sexual dimorphism in the chelae, and Centruroides sp., which does not have such marked dimorphism in the chelae. We evaluated aspects such as chela pinch force, toxicity to prey (LD50) and the volume of venom in males and females of each species. We found significant differences between males and females of Chactas sp. in the chela pinch force, volume of venom and LD50. In contrast, for Centruroides sp., no differences between males and females were found in any of these traits. We discuss several potential selective regimes that could account for the pattern observed.
Julio César González-Gómez; Juan Carlos Valenzuela-Rojas; Luis Fernando García; Lida Marcela Franco Pérez; Giovany Guevara; Sandra Buitrago; Allison Cubillos; Arie Van Der Meijden. Sexual dimorphism in the biomechanical and toxicological performance in prey incapacitation of two morphologically distinct scorpion species (Chactas sp. and Centruroides sp.). Biological Journal of the Linnean Society 2019, 1 .
AMA StyleJulio César González-Gómez, Juan Carlos Valenzuela-Rojas, Luis Fernando García, Lida Marcela Franco Pérez, Giovany Guevara, Sandra Buitrago, Allison Cubillos, Arie Van Der Meijden. Sexual dimorphism in the biomechanical and toxicological performance in prey incapacitation of two morphologically distinct scorpion species (Chactas sp. and Centruroides sp.). Biological Journal of the Linnean Society. 2019; ():1.
Chicago/Turabian StyleJulio César González-Gómez; Juan Carlos Valenzuela-Rojas; Luis Fernando García; Lida Marcela Franco Pérez; Giovany Guevara; Sandra Buitrago; Allison Cubillos; Arie Van Der Meijden. 2019. "Sexual dimorphism in the biomechanical and toxicological performance in prey incapacitation of two morphologically distinct scorpion species (Chactas sp. and Centruroides sp.)." Biological Journal of the Linnean Society , no. : 1.
Background Behavior and activity patterns largely determine animal’s fitness and their ecological roles. Those patterns depend on many factors, being body mass, sex and age the most relevant in mammals. Particularly, those factors altogether with environmental conditions could influence movement behavior of mammals that hibernate, such as the Monito del monte (Dromiciops gliroides). Methods To evaluate its movement behavior and activity we radio-tracked D. gliroides 12 individuals (8 females and 4 males, corresponding to 5 adults and 7 sub-adults) during the austral summer. With the estimated locations we estimated home ranges, core areas and their relationship with body mass. We also assessed movement speed during early (19:00 to 01:00 h), peak (01:00 to 03:00 h) and late (03:00 to 07:00 h) activity periods. This study was conducted at the San Martín experimental forest (Valdivia, southern Chile). Results Estimated home range areas were 1.04 ± 0.20 ha, and core areas were 0.27 ± 0.06 ha; we found no significant differences between males and females, nor between adults and sub-adults. Home range and core areas were independent of body mass in females but showed positive relationships in males. Core area overlap was larger between sub-adult and adult individuals (35%) than between adult males and females (13%). Average movement D. gliroides speed was 1.45 m/min, reaching its lowest value during the peak activity period (01:00 to 03:00 h), but being faster during early and late activity periods. Those speed differences may be related to travelling and foraging activities. Conclusion Home range and core areas estimated here showed a large variability, which can be related to environmental factors. Home range size was positively correlated with body mass on males but not on females. Also, lower movement speeds at the peak activity period suggest that D. gliroides concentrates feeding activities at this time. As D. gliroides disperses the seeds of at least 16 native plant species, its movement behavior also has important consequences at the community level.
Lida M. Franco; Francisco E. Fontúrbel; Giovany Guevara; Mauricio Soto-Gamboa. Movement behavior of the Monito del monte (Dromiciops gliroides): new insights into the ecology of a unique marsupial. Revista Chilena de Historia Natural 2019, 92, 1 -7.
AMA StyleLida M. Franco, Francisco E. Fontúrbel, Giovany Guevara, Mauricio Soto-Gamboa. Movement behavior of the Monito del monte (Dromiciops gliroides): new insights into the ecology of a unique marsupial. Revista Chilena de Historia Natural. 2019; 92 (1):1-7.
Chicago/Turabian StyleLida M. Franco; Francisco E. Fontúrbel; Giovany Guevara; Mauricio Soto-Gamboa. 2019. "Movement behavior of the Monito del monte (Dromiciops gliroides): new insights into the ecology of a unique marsupial." Revista Chilena de Historia Natural 92, no. 1: 1-7.
Spiders rely on venom to catch prey and few species are even capable of capturing vertebrates. The majority of spiders are generalist predators, possessing complex venom, in which different toxins seem to target different types of prey. In this study, we focused on the trophic ecology and venom toxicity of Phoneutria boliviensis F. O. Pickard-Cambridge, 1897, a Central American spider of medical importance. We tested the hypothesis that its venom is adapted to catch vertebrate prey by studying its trophic ecology and venom toxicity against selected vertebrate and invertebrate prey. We compared both trophic ecology (based on acceptance experiments) and toxicity (based on bioassays) among sexes of this species. We found that P. boliviensis accepted geckos, spiders, and cockroaches as prey, but rejected frogs. There was no difference in acceptance between males and females. The venom of P. boliviensis was far more efficient against vertebrate (geckos) than invertebrate (spiders) prey in both immobilization time and LD50. Surprisingly, venom of males was more efficient than that of females. Our results suggest that P. boliviensis has adapted its venom to catch vertebrates, which may explain its toxicity to humans.
Juan Carlos Valenzuela-Rojas; Julio César González-Gómez; Arie Van Der Meijden; Juan Nicolás Cortés; Giovany Guevara; Lida Marcela Franco; Stano Pekár; Luis Fernando García. Prey and Venom Efficacy of Male and Female Wandering Spider, Phoneutria boliviensis (Araneae: Ctenidae). Toxins 2019, 11, 622 .
AMA StyleJuan Carlos Valenzuela-Rojas, Julio César González-Gómez, Arie Van Der Meijden, Juan Nicolás Cortés, Giovany Guevara, Lida Marcela Franco, Stano Pekár, Luis Fernando García. Prey and Venom Efficacy of Male and Female Wandering Spider, Phoneutria boliviensis (Araneae: Ctenidae). Toxins. 2019; 11 (11):622.
Chicago/Turabian StyleJuan Carlos Valenzuela-Rojas; Julio César González-Gómez; Arie Van Der Meijden; Juan Nicolás Cortés; Giovany Guevara; Lida Marcela Franco; Stano Pekár; Luis Fernando García. 2019. "Prey and Venom Efficacy of Male and Female Wandering Spider, Phoneutria boliviensis (Araneae: Ctenidae)." Toxins 11, no. 11: 622.
Planted forests are becoming increasingly common worldwide, replacing natural forests and compromising their associated biodiversity. However, not all forest plantations are the same. Aiming to identify key plantation features that could be managed to improve bird diversity, we conducted a meta-analysis examining the differential effects of several kinds of plantations on bird species richness and abundance. Our literature survey provided 123 case studies (68 cases for species richness and 55 for abundance), which showed that, although forest plantations have negative effects on both richness and abundance, there is a large heterogeneity of responses among plantation types. The least negative effects were found at plantations established with native tree species and mixed arrangements, along with those intended for protective uses. Moreover, exotic monocultures for commercial purposes were found to be the most negative plantations for bird diversity. Likewise, small (<36 ha) stands, those with large rotation times, as well as plantations connected with native forest remnants at the landscape level were more avifauna-friendly. However, the presence of understory vegetation and the lack of management were not beneficial to bird diversity, as was also previously suggested by local studies. These global patterns of change in bird diversity in forest plantations hint which features could be managed to reduce their negative effects on bird diversity, making these productive lands friendlier to biodiversity in the long-term.
Gabriel J. Castaño-Villa; Jaime V. Estevez; Giovany Guevara; Mauricio Bohada Murillo; Francisco E. Fontúrbel. Differential effects of forestry plantations on bird diversity: A global assessment. Forest Ecology and Management 2019, 440, 202 -207.
AMA StyleGabriel J. Castaño-Villa, Jaime V. Estevez, Giovany Guevara, Mauricio Bohada Murillo, Francisco E. Fontúrbel. Differential effects of forestry plantations on bird diversity: A global assessment. Forest Ecology and Management. 2019; 440 ():202-207.
Chicago/Turabian StyleGabriel J. Castaño-Villa; Jaime V. Estevez; Giovany Guevara; Mauricio Bohada Murillo; Francisco E. Fontúrbel. 2019. "Differential effects of forestry plantations on bird diversity: A global assessment." Forest Ecology and Management 440, no. : 202-207.
This paper describes the Photafish System, an innovative technique for capturing high-quality digital images of live freshwater fishes and other aquatic organisms in the field. This system may improve and facilitate the visual documentation of such organisms to illustrate guidebooks, populate online databases and support scientific papers, particularly taxonomic ones. The system was designed and tested to produce Taxonomically Informative Photos (TIPs) of living specimens and employs an Aquarium Assembly for Photography (AAP) distinguished by its portability and low cost. Using Neotropical freshwater fishes as a model, we propose an optimized protocol for documenting the morphology of live specimens to support taxonomy, as well as awareness and conservation of freshwater biodiversity. This paper addresses the technical aspects and challenges of field studio photography in remote locations. Tricks gleaned from personal experiences with nature photography are also shared. Finally, we briefly discuss the advantages and weaknesses of our approach.
Jorge E. García-Melo; Luís J. García-Melo; Jesús D. García-Melo; Diana K. Rojas-Briñez; Giovany Guevara; Javier A. Maldonado-Ocampo. Photafish system: An affordable device for fish photography in the wild. Zootaxa 2019, 4554, 141 -172.
AMA StyleJorge E. García-Melo, Luís J. García-Melo, Jesús D. García-Melo, Diana K. Rojas-Briñez, Giovany Guevara, Javier A. Maldonado-Ocampo. Photafish system: An affordable device for fish photography in the wild. Zootaxa. 2019; 4554 (1):141-172.
Chicago/Turabian StyleJorge E. García-Melo; Luís J. García-Melo; Jesús D. García-Melo; Diana K. Rojas-Briñez; Giovany Guevara; Javier A. Maldonado-Ocampo. 2019. "Photafish system: An affordable device for fish photography in the wild." Zootaxa 4554, no. 1: 141-172.
Giovany Guevara; Roberto Godoy; Marcela Franco. Linking riparian forest harvest to benthic macroinvertebrate communities in Andean headwater streams in southern Chile. Limnologica 2018, 68, 105 -114.
AMA StyleGiovany Guevara, Roberto Godoy, Marcela Franco. Linking riparian forest harvest to benthic macroinvertebrate communities in Andean headwater streams in southern Chile. Limnologica. 2018; 68 ():105-114.
Chicago/Turabian StyleGiovany Guevara; Roberto Godoy; Marcela Franco. 2018. "Linking riparian forest harvest to benthic macroinvertebrate communities in Andean headwater streams in southern Chile." Limnologica 68, no. : 105-114.
Jennifer Zapata-Ciro; Giovany Guevara; Gabriel Jaime Castaño-Villa. Conocimiento popular y perspectivas de conservación sobre las tortugas continentales en la parte baja del río La Miel (Colombia). Luna Azul 2016, 43, 15 -28.
AMA StyleJennifer Zapata-Ciro, Giovany Guevara, Gabriel Jaime Castaño-Villa. Conocimiento popular y perspectivas de conservación sobre las tortugas continentales en la parte baja del río La Miel (Colombia). Luna Azul. 2016; 43 ():15-28.
Chicago/Turabian StyleJennifer Zapata-Ciro; Giovany Guevara; Gabriel Jaime Castaño-Villa. 2016. "Conocimiento popular y perspectivas de conservación sobre las tortugas continentales en la parte baja del río La Miel (Colombia)." Luna Azul 43, no. : 15-28.
The planthopper subfamily Asiracinae (Hemiptera: Auchenorrhyncha: Delphacidae) and the species Copicerus irroratus Swartz are reported for the first time for Colombia from an agricultural landscape at the Andean region (Villamaría, Caldas). Relevant diagnostic and biological features of the species are discussed. A key to the species of Copicerus is also provided. Se reporta por primera vez para Colombia un espécimen de la subfamilia Asiracinae (Hemiptera: Auchenorrhyncha: Delphacidae), Copicerus irroratus Swartz en un paisaje agrícola de la región Andina del país (Villamaría, Caldas). Se resaltan algunas características diagnósticas y biológicas de la especie. Adicionalmente, se propone una clave para las especies de Copicerus.
Camilo Andrés Llano; Charles Bartlett; Giovany Guevara. First Record of the Subfamily Asiracinae andCopicerus irroratus(Hemiptera: Auchenorrhyncha: Delphacidae) in Colombia. Florida Entomologist 2016, 99, 120 -122.
AMA StyleCamilo Andrés Llano, Charles Bartlett, Giovany Guevara. First Record of the Subfamily Asiracinae andCopicerus irroratus(Hemiptera: Auchenorrhyncha: Delphacidae) in Colombia. Florida Entomologist. 2016; 99 (1):120-122.
Chicago/Turabian StyleCamilo Andrés Llano; Charles Bartlett; Giovany Guevara. 2016. "First Record of the Subfamily Asiracinae andCopicerus irroratus(Hemiptera: Auchenorrhyncha: Delphacidae) in Colombia." Florida Entomologist 99, no. 1: 120-122.
We assessed the effect of forest management practices on temporal differences in riparian litterfall input and autumnal leaf litter processing of 3 evergreen plant species, using independently 2 mesh sizes (for two of the three species), between two contrasting headwater streams draining (a) near-pristine and (b) harvested evergreen old-growth forests in Chile (39° S). Additionally, we compared rainfall, streamflow, suspended sediment concentration, and the in-stream invertebrate community, collected two years after logging in the harvested microcatchment. The harvested forested stream had higher runoff, suspended sediment concentration and input of litter (3377 kg ha−1 yr−1) than the pristine stream (3166 kg ha−1 yr−1). However, leaf-litter decay rates were faster for the pristine (ranging from k = −0.0120 to −0.0024 day−1) than for the harvested forest stream (k = −0.0049 to −0.0023 day−1) depending on leaf species and litterbag type. Likewise, the pristine stream revealed higher shredder taxa richness than harvested stream, suggesting a higher correlation with the decomposition rate and leaf mass losses. Therefore, the results of our study suggest that despite the implementation of best management practices on riparian forests, there are detectable shifts in the structure and functioning of aquatic invertebrate community in the Andean streams of south-central Chile.
Giovany Guevara; Roberto Godoy; Pascal Boeckx; Carlos Jara; Carlos Oyarzún. Effects of riparian forest management on Chilean mountain in-stream characteristics. Ecohydrology & Hydrobiology 2015, 15, 160 -170.
AMA StyleGiovany Guevara, Roberto Godoy, Pascal Boeckx, Carlos Jara, Carlos Oyarzún. Effects of riparian forest management on Chilean mountain in-stream characteristics. Ecohydrology & Hydrobiology. 2015; 15 (3):160-170.
Chicago/Turabian StyleGiovany Guevara; Roberto Godoy; Pascal Boeckx; Carlos Jara; Carlos Oyarzún. 2015. "Effects of riparian forest management on Chilean mountain in-stream characteristics." Ecohydrology & Hydrobiology 15, no. 3: 160-170.
Giovany Guevara. Letter to the Editor regarding recent article by Brazeal [Extr. Ind. Soc. 1 (2014) 273–283]. The Extractive Industries and Society 2015, 2, 193 .
AMA StyleGiovany Guevara. Letter to the Editor regarding recent article by Brazeal [Extr. Ind. Soc. 1 (2014) 273–283]. The Extractive Industries and Society. 2015; 2 (2):193.
Chicago/Turabian StyleGiovany Guevara. 2015. "Letter to the Editor regarding recent article by Brazeal [Extr. Ind. Soc. 1 (2014) 273–283]." The Extractive Industries and Society 2, no. 2: 193.
Álvaro Javier Martínez Ballesteros; Carlos Mario Plaza Rodríguez; Giovany Guevara. APORTE DE HOJARASCA DEL MANGLE NEGRO (Avicennia germinans L.) EN EL CARIBE COLOMBIANO. Luna Azul 2014, 218 -230.
AMA StyleÁlvaro Javier Martínez Ballesteros, Carlos Mario Plaza Rodríguez, Giovany Guevara. APORTE DE HOJARASCA DEL MANGLE NEGRO (Avicennia germinans L.) EN EL CARIBE COLOMBIANO. Luna Azul. 2014; (38):218-230.
Chicago/Turabian StyleÁlvaro Javier Martínez Ballesteros; Carlos Mario Plaza Rodríguez; Giovany Guevara. 2014. "APORTE DE HOJARASCA DEL MANGLE NEGRO (Avicennia germinans L.) EN EL CARIBE COLOMBIANO." Luna Azul , no. 38: 218-230.
River ecosystems, mainly those draining tropical dry forests, are among the most endangered tropical ecosystems and a major conservation priority in South America, as elsewhere. In this study, we assessed the influence of environmental factors (e.g., precipitation) and riparian vegetation on Trichoptera larval assemblages colonizing four substrates (rock, gravel, sand, and litter) in the Venadillo and Opia watersheds (Tolima, Colombia). In each river, five 20m reaches nested into two 100m segments (one at ~550 and another at ~250masl), were surveyed for benthic invertebrates in the above mentioned substrates. In addition, water samples were collected for physicochemical analyses and the QBR index (“qualitat del bosc de ribera” or riparian forest quality) was applied in both rivers. A total of 6 282 larvae were collected, belonging to 11 families and 22 genera, representing 73.30% and 43.13% of the Trichoptera fauna reported to Colombia, respectively. The most abundant families were Hydropsychidae (49.86%) and Philopotamidae (25.44%) and the least abundant Odontoceridae (0.16%) and Hydrobiosidae (0.06%). The genera Smicridea, Chimarra, Protoptila, Neotrichia, and Leptonema, were common during dry and rainy seasons. The main factors related to changes in composition, richness, and abundance of larval Trichoptera were seasonality and riparian vegetation, which can influence organic matter supply, availability and stability of substrates, and colonization and population dynamics. Trichoptera assemblages showed no significant differences among substrates. However sampling points located at high elevation and in non-urbanized areas offered the largest variety of substrates and richness. Our results indicate that Trichoptera larvae are an important biotic element in freshwater ecosystems and that they are sensitive to environmental changes. Hence, our study suggests that caddisflies may be used as potential organisms for the biomonitoring of tropical dry forest rivers. The implementation of these studies is urgent, considering that degradation of freshwater ecosystems tends to be severe and persistent in dry forest. Rev. Biol. Trop. 62 (Suppl. 2): 21-40. Epub 2014 April 01.
Jesús M. Vázquez-Ramos; Giovany Guevara-Cardona; Gladys Reinoso-Flórez. Factores ambientales asociados con la preferencia de hábitat de larvas de tricópteros en cuencas con bosque seco tropical (Tolima, Colombia). Revista de Biología Tropical 2014, 62, 21 -40.
AMA StyleJesús M. Vázquez-Ramos, Giovany Guevara-Cardona, Gladys Reinoso-Flórez. Factores ambientales asociados con la preferencia de hábitat de larvas de tricópteros en cuencas con bosque seco tropical (Tolima, Colombia). Revista de Biología Tropical. 2014; 62 ():21-40.
Chicago/Turabian StyleJesús M. Vázquez-Ramos; Giovany Guevara-Cardona; Gladys Reinoso-Flórez. 2014. "Factores ambientales asociados con la preferencia de hábitat de larvas de tricópteros en cuencas con bosque seco tropical (Tolima, Colombia)." Revista de Biología Tropical 62, no. : 21-40.
Non-invasive methodological approaches are highly recommended and commonly used to study the feeding ecology of elusive and threatened mammals. In this study, we use multiple lines of evidence to assess the feeding strategies of the endangered Southern river otter, by determining seasonal prey availability (electrofishing), analysis of undigested prey remains (spraints), and the use of stable isotopes (δ15N and δ13C) in otter spraints (n = 262) and prey in a wetland ecosystem of southern Chile (39°49′S, 73°15′W). Fecal and isotopic analyses suggest that the otter diet is restricted to a few prey items, particularly the less-mobile, bottom-living, and larger prey such as crayfish (Samastacus spinifrons, 86.11 %) and crabs (Aegla spp., 32.45 %), supplemented opportunistically by cyprinids (Cyprinus carpio, 9.55 %) and catfish (Diplomystes camposensis, 5.66 %). The results suggest that the river otter is highly specialized in bottom foraging. Isotopic signatures of food sources and feces revealed a mid-upper trophic position for the Southern river otter, with either higher or lower δ15N values than their potential prey items. δ13C values for river otters were less enriched than their potential food resources. We suggest that due to their narrow trophic niche and possible dependence on only a few food items, this species may be highly vulnerable to the reduction in its prey populations. Finally, maintaining the ecological interactions between Southern river otters and their prey is considered a central priority for the survival of this endangered carnivore mammal.
Marcela Franco; Giovany Guevara; Loreto Correa; Mauricio Soto-Gamboa. Trophic interactions of the endangered Southern river otter (Lontra provocax) in a Chilean Ramsar wetland inferred from prey sampling, fecal analysis, and stable isotopes. The Science of Nature 2013, 100, 299 -310.
AMA StyleMarcela Franco, Giovany Guevara, Loreto Correa, Mauricio Soto-Gamboa. Trophic interactions of the endangered Southern river otter (Lontra provocax) in a Chilean Ramsar wetland inferred from prey sampling, fecal analysis, and stable isotopes. The Science of Nature. 2013; 100 (4):299-310.
Chicago/Turabian StyleMarcela Franco; Giovany Guevara; Loreto Correa; Mauricio Soto-Gamboa. 2013. "Trophic interactions of the endangered Southern river otter (Lontra provocax) in a Chilean Ramsar wetland inferred from prey sampling, fecal analysis, and stable isotopes." The Science of Nature 100, no. 4: 299-310.
Giovany Guevara; Carlos Jara; Roberto Godoy; Pascal Boeckx. Importancia ecológica de parásitos (Nematomorpha: Gordiida) en arroyos de montaña. Revista chilena de historia natural 2013, 86, 107 -111.
AMA StyleGiovany Guevara, Carlos Jara, Roberto Godoy, Pascal Boeckx. Importancia ecológica de parásitos (Nematomorpha: Gordiida) en arroyos de montaña. Revista chilena de historia natural. 2013; 86 (1):107-111.
Chicago/Turabian StyleGiovany Guevara; Carlos Jara; Roberto Godoy; Pascal Boeckx. 2013. "Importancia ecológica de parásitos (Nematomorpha: Gordiida) en arroyos de montaña." Revista chilena de historia natural 86, no. 1: 107-111.
Zooplankton community analyses can reveal valuable information about the trophic status and secondary production in reservoirs. The zooplankton seasonal distribution and important physical and chemical parameters in Prado Reservoir (Tolima, Central Colombia) were studied in monthly surveys throughout a hydrological cycle (February 2000–January 2001) in order to establish seasonal patterns and the biotic and abiotic relationships for the reservoir. Surface zooplankton collections at 1m depth were taken at six sampling stations with regard to reservoir morphometry, location of main tributaries and mixing areas of the incoming tributaries. Cladocerans numerically dominated (48.1%) the community throughout the study period followed by Copepoda (32.7%), Rotifera (19.1%), and Diptera larvae (0.01%). Among the cladocerans, there was a greater abundance of Bosmina longirostris (69.8%) than other crustaceans. Among the Rotifera, Brachionus falcatus was the most abundant with 23% and Keratella tropica was least abundant with 8%. The only cyclopoid species found was Thermocyclops decipiens. The phantom midge Chaoborus sp. was also part of the zooplankton community. Based on numbers, cladocerans represented a significant component of the zooplankton in both dry and rainy seasons. Four species (Brachionus spp., K. tropica, Diaphanosoma brachyurum, Ceriodaphnia cornuta, Moina sp., and T. decipiens) had never previously been found in the reservoir, but were recorded for other standing Colombian water bodies. The replacement of B. longirostris instead of Daphnia sp. as dominant species was observed. The results of the comparison of the different studies confirmed that the trophic state of this artificial lake may be classified as eutrophic, and in general, physical, and chemical homogeneity were observed both spatially and temporally
Giovany Guevara; Paola Lozano; Gladys Reinoso; Francisco Villa. Horizontal and seasonal patterns of tropical zooplankton from the eutrophic Prado Reservoir (Colombia). Limnologica 2009, 39, 128 -139.
AMA StyleGiovany Guevara, Paola Lozano, Gladys Reinoso, Francisco Villa. Horizontal and seasonal patterns of tropical zooplankton from the eutrophic Prado Reservoir (Colombia). Limnologica. 2009; 39 (2):128-139.
Chicago/Turabian StyleGiovany Guevara; Paola Lozano; Gladys Reinoso; Francisco Villa. 2009. "Horizontal and seasonal patterns of tropical zooplankton from the eutrophic Prado Reservoir (Colombia)." Limnologica 39, no. 2: 128-139.
Cattleya trianae is an endemic species from the tropical rainforest in the Colombian Andes. Its survival is currently threatened due to habitat loss and commercial overexploitation. This study evaluates ten substrates, some organic (pine bark, coconut fiber and wood shavings), some inert icopor (polystyrene foam), vegetable coal and their combinations, and the effects these have on morphometric and phenotypic traits in the hardening phase of 250 plants of C. trianae cultivated in vitro. Recorded data include percent survival, length of longest leaf, biomass (wet weight) and number of roots and leaves at the beginning and at the end of the experiment. After the hardening phase, the plants were taken to a greenhouse and later to the natural environment. Coconut fiber alone or mixed in equal parts with pine bark and coal was the most efficient substrate when percent survival (80+/-SE=0.3742), biomass, and leaf length were evaluated. Hardened plants displayed qualitative characteristics such as vigor, hardness and waxy texture, strength of green coloration in the leaves, and velamen formation. Under greenhouse conditions, plants grew better with filtered light, relative humidity bordering on 80 %, permanent aeration, misting with water, and an average temperature of 25+/-2 degrees C. Invigorated plants were firmly anchored on their host trees.
Marcela Franco; Giovany Guevara; Neftali Mesa; Gloria Urueña. Hardening of the national flower of Colombia, the threatened Cattleya trianae (Orchidaceae), from in vitro culture with previous invigoration phase. Revista de Biología Tropical 2007, 55, 1 .
AMA StyleMarcela Franco, Giovany Guevara, Neftali Mesa, Gloria Urueña. Hardening of the national flower of Colombia, the threatened Cattleya trianae (Orchidaceae), from in vitro culture with previous invigoration phase. Revista de Biología Tropical. 2007; 55 (2):1.
Chicago/Turabian StyleMarcela Franco; Giovany Guevara; Neftali Mesa; Gloria Urueña. 2007. "Hardening of the national flower of Colombia, the threatened Cattleya trianae (Orchidaceae), from in vitro culture with previous invigoration phase." Revista de Biología Tropical 55, no. 2: 1.