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Riparian zones (RZs) are transitional environments at the interface between land and freshwater ecosystems, which are important in terms of socioecological services. In this work, we report a bibliometric-based analysis to unveil the knowledge structure and actors of scientific production on riparian zones for the first 20 years of the 21st century. We performed a literature search, querying for riparian zones publications for the period 2001–2020. The selected 1171 bibliographic records were analyzed by extracting several bibliometric indices of reporting tendencies, location, collaboration dynamics, and top topics. Results show that RZs publications increased considerably from 2001 to 2020, and top journals publishing on the subject are from the water, environmental management, and ecology areas. The US, China, Brazil, and Canada were the most productive countries, while the institutions with higher productivity were the Chinese Academy of Sciences and Oregon University. In terms of impact, the US, Canada, and Australia led in citation number, while the country collaboration network showed that the strongest links occur between China and the US. Our results also show that few studies were produced in low-middle income countries, which suggests a need to funnel international funding to study riparian environments in these geographical contexts. According to analysis of frequency, top topics are related to water quality and focused on lotic environments. We here present the main knowledge structure of RZs studies globally for the first 20 years of the XXI century.
Sara Pedraza; Nicola Clerici; Jennifer Zuluaga Gaviria; Adriana Sanchez. Global Research on Riparian Zones in the XXI Century: A Bibliometric Analysis. Water 2021, 13, 1836 .
AMA StyleSara Pedraza, Nicola Clerici, Jennifer Zuluaga Gaviria, Adriana Sanchez. Global Research on Riparian Zones in the XXI Century: A Bibliometric Analysis. Water. 2021; 13 (13):1836.
Chicago/Turabian StyleSara Pedraza; Nicola Clerici; Jennifer Zuluaga Gaviria; Adriana Sanchez. 2021. "Global Research on Riparian Zones in the XXI Century: A Bibliometric Analysis." Water 13, no. 13: 1836.
Research Highlights: Seasonally flooded and terra firme forests are characteristic ecosystems of the Colombian Orinoco Basin and great importance in the maintenance of regional biodiversity and ecosystem function. These forests have a unimodal precipitation regime that can cause a temporal effect on the seedling regeneration niche. This could partly explain the high diversity and coexistence of plant species in these forests, as well as the similarity in composition of seedlings and trees. Background and Objectives: Seedlings are a key factor in the assembly of plant communities. We evaluated the effect of flooding and rains on the dissimilarity and compositional affinity between trees and seedlings of seasonally flooded and terra firme forests. Materials and Methods: the tree community of these forests in San Martín (Meta, Colombia) was characterized and compared with their respective seedling communities before (June) and after (December) rain and flooding (during the rainy season). We evaluated plant species diversity and abundance (Shannon diversity and the J de Pielou index), as well as the compositional dissimilarities of each tree community with their corresponding seedling community sampled at the beginning and end of rains and flooding (Bray–Curtis dissimilarity). We also compared sampling site composition using an NMDS analysis. Results: We found that the terra firme forest had higher diversity compared to the flooded forest. Seedling density decreased significantly in the seasonally flooded forest after the flood, in contrast to the non-significant decrease at the end of the rainy season in terra firme. The compositional dissimilarity in the seasonally inundated forest decreased significantly between trees and seedlings after the flood. However, this pattern was not evident in the terra firme forest. Conclusions: These results indicate that seasonal flooding generates a strong ecological filter that affects the realized niche of plants in these forests. Our results can contribute valuable information to the effective development of assisted restoration and conservation programs.
Brayan S. Polanía; Ana M. Aldana; Marius Bottin; Diana M. Cruz; Francisco Castro-Lima; Pablo R. Stevenson; Adriana Sanchez. Effect of Seasonal Rains and Floods on Seedling Recruitment and Compositional Similarity in Two Lowland Tropical Forests. Forests 2020, 11, 1297 .
AMA StyleBrayan S. Polanía, Ana M. Aldana, Marius Bottin, Diana M. Cruz, Francisco Castro-Lima, Pablo R. Stevenson, Adriana Sanchez. Effect of Seasonal Rains and Floods on Seedling Recruitment and Compositional Similarity in Two Lowland Tropical Forests. Forests. 2020; 11 (12):1297.
Chicago/Turabian StyleBrayan S. Polanía; Ana M. Aldana; Marius Bottin; Diana M. Cruz; Francisco Castro-Lima; Pablo R. Stevenson; Adriana Sanchez. 2020. "Effect of Seasonal Rains and Floods on Seedling Recruitment and Compositional Similarity in Two Lowland Tropical Forests." Forests 11, no. 12: 1297.
Research Highlights: Functional diversity studies help to better understand how organisms respond to different environmental conditions. Conditions in tropical flooded forests are highly variable, including levels of nutrient availability, pH, and flood depth, but few studies have explored the impact of variation in these factors on plant functional diversity. Background and Objectives: In the Orinoco basin, as in the Amazon, floodplain forests have been classified into várzea (white-water rivers, with nutrient-rich soils) and igapó (black-water rivers, associated with nutrient-poor soils). We evaluated the functional diversity of plant species in várzea and igapó, as well as the influence of external and internal filters on the plant community assembly of each forest type, and compared our results with studies in the Amazon basin. Materials and Methods: Six functional traits were recorded in the várzea and igapó forests of the Colombian Orinoco basin (one-hectare plot for each forest type, with no replicates). We evaluated plant species diversity (richness, Fisher’s α, Shannon and Simpson indices), as well as functional diversity (functional richness, functional evenness, functional divergence, and functional dispersion) and the influence of external and internal filters, based on a comparison of variance at different organizational levels. Results: A high functional differentiation between várzea and igapó was found, as well as a high functional divergence within each forest type. We also observed a greater influence of internal filters on the community assembly of both forest types, compared to external filters. Functional traits such as wood density and leaf dry matter content, showed the same patterns as the várzea and igapó forests in the Amazon. Conclusions: Despite the low taxonomic and functional richness, there is high functional divergence within flooded forests. We also show that in forests under stress (e.g., from flooding), internal filters can be key in assembling communities and promote high functional divergence. Given that the functional diversity of the várzea and igapó in the Orinoco is largely unexplored, we highlight the need for more research for the effective conservation of these flooded forests.
Diana Bonilla; Ana Aldana; Sasha Cárdenas; Adriana Sanchez. Functional Divergence between Várzea and Igapó Forests: A Study of Functional Trait Diversity in the Colombian Orinoco Basin. Forests 2020, 11, 1172 .
AMA StyleDiana Bonilla, Ana Aldana, Sasha Cárdenas, Adriana Sanchez. Functional Divergence between Várzea and Igapó Forests: A Study of Functional Trait Diversity in the Colombian Orinoco Basin. Forests. 2020; 11 (11):1172.
Chicago/Turabian StyleDiana Bonilla; Ana Aldana; Sasha Cárdenas; Adriana Sanchez. 2020. "Functional Divergence between Várzea and Igapó Forests: A Study of Functional Trait Diversity in the Colombian Orinoco Basin." Forests 11, no. 11: 1172.
Paramo ecosystems are tropical alpine grasslands, located above 3000 m.a.s.l. in the Andean mountain range. Their unique vegetation and soil characteristics, in combination with low temperature and abundant precipitation, create the most advantageous conditions for regulating and storing surface and groundwater. However, increasing temperatures and changing patterns of precipitation due to greenhouse-gas-emission climate change are threatening these fragile environments. In this study, we used regional observations and downscaled data for precipitation and minimum and maximum temperature during the reference period 1960–1990 and simulations for the future period 2041–2060 to study the present and future extents of paramo ecosystems in the Chingaza National Park (CNP), nearby Colombia’s capital city, Bogotá. The historical data were used for establishing upper and lower precipitation and temperature boundaries to determine the locations where paramo ecosystems currently thrive. Our results found that increasing mean monthly temperatures and changing precipitation will render 39 to 52% of the current paramo extent in CNP unsuitable for these ecosystems during the dry season, and 13 to 34% during the wet season. The greatest loss of paramo area will occur during the dry season and for the representative concentration pathway (RCP) scenario 8.5, when both temperature and precipitation boundaries are more prone to be exceeded. Although our initial estimates show the future impact on paramos and the water security of Bogotá due to climate change, complex internal and external interactions in paramo ecosystems make it essential to study other influencing climatic parameters (e.g., soil, topography, wind, etc.) apart from temperature and precipitation.
Matilda Cresso; Nicola Clerici; Adriana Sanchez; Fernando Jaramillo. Future Climate Change Renders Unsuitable Conditions for Paramo Ecosystems in Colombia. Sustainability 2020, 12, 8373 .
AMA StyleMatilda Cresso, Nicola Clerici, Adriana Sanchez, Fernando Jaramillo. Future Climate Change Renders Unsuitable Conditions for Paramo Ecosystems in Colombia. Sustainability. 2020; 12 (20):8373.
Chicago/Turabian StyleMatilda Cresso; Nicola Clerici; Adriana Sanchez; Fernando Jaramillo. 2020. "Future Climate Change Renders Unsuitable Conditions for Paramo Ecosystems in Colombia." Sustainability 12, no. 20: 8373.
Question As a result of recent and substantial digitization efforts, herbaria are becoming important sources of data for vegetation scientists. Are such datasets appropriate to describe composition gradients and β‐diversity? When compared with phytosociological data, what are the differences in terms of composition (co‐occurrence) gradients depending on the considered scale? Location Páramos (Neo‐tropical alpine ecosystems) of Colombia. Methods We compared vegetation patterns from phytosociological relevés and reconstructed pseudo‐communities from herbarium collections in the Colombian high elevation páramo ecosystem using diversity partitioning and Mantel correlations. Results Species composition differed in the two datasets, which could be explained by taxonomic bias toward charismatic species and over‐representation of rare species in the herbarium dataset, whereas common species were more frequently represented in the phytosociological dataset. The two datasets showed a similarly preponderant importance of large‐scale differences when we looked at species accumulation across different scales. Small scale richness contributed more to total richness for the phytosociological dataset, while richness at intermediate scales was more important in the herbarium dataset. Finally, pairwise β‐diversity analyses did not show correlations between datasets, and common species showed similar ecological distribution patterns. Conclusions We recommend caution to researchers who wish to describe β‐diversity patterns in local communities using only herbarium data. However, since the two datasets showed some complementarity in their composition patterns, we suggest that combining data from relevés (or plots) and occurrence data (herbarium records, citizen science, etc.) could be an efficient strategy for describing broader diversity patterns. We discuss the circumstances under which it could be advantageous to work with such combined datasets, in particular in relation to conservation issues.
Marius Bottin; Gwendolyn Peyre; Carlos Vargas; Lauren Raz; James E. Richardson; Adriana Sanchez. Phytosociological data and herbarium collections show congruent large‐scale patterns but differ in their local descriptions of community composition. Journal of Vegetation Science 2019, 31, 208 -219.
AMA StyleMarius Bottin, Gwendolyn Peyre, Carlos Vargas, Lauren Raz, James E. Richardson, Adriana Sanchez. Phytosociological data and herbarium collections show congruent large‐scale patterns but differ in their local descriptions of community composition. Journal of Vegetation Science. 2019; 31 (1):208-219.
Chicago/Turabian StyleMarius Bottin; Gwendolyn Peyre; Carlos Vargas; Lauren Raz; James E. Richardson; Adriana Sanchez. 2019. "Phytosociological data and herbarium collections show congruent large‐scale patterns but differ in their local descriptions of community composition." Journal of Vegetation Science 31, no. 1: 208-219.
Aims The effects of clouds are now recognized as critically important to the understanding of climate change impacts on ecosystems. Regardless, few studies have focused specifically on the ecophysiological responses of plants to clouds. Most continental mountain ranges are characterized by common convective cloud formation in the afternoons, yet little is known regarding this influence on plant water and carbon relations. Here we compare the ecophysiology of two contrasting, yet ubiquitous growth forms, needle-leaf and broadleaf, under representative cloud regimes of the Snowy Range, Medicine Bow Mountains, southeastern Wyoming, USA. Methods Photosynthetic gas exchange, water use efficiency, xylem water potentials, and micrometereological data were measured on representative clear, overcast, and partly cloudy days during the summers of 2012 and 2013 for two indigenous broadleaf (Caltha leptosepala and Arnica parryi) and two needle-leaf species (Picea engelmannii and Abies lasiocarpa) that co-occur contiguously. Important Findings Reductions in sunlight with cloud cover resulted in more dramatic declines in photosynthesis for the two broadleaf species (ca. 50-70% reduction) versus the two conifers (no significant difference). In addition, the presence of clouds corresponded with lower leaf conductance, transpiration, and plant water status in all species. However, the more constant photosynthesis in conifers under all cloud conditions, coupled with reduced transpiration, resulted in greater water use efficiency (ca. 25 % higher) than the broadleaf species. These differences appear to implicate the potential importance of natural cloud patterns in the adaptive ecophysiology of these two contrasting, but common, plant growth forms.
Adriana Sanchez; Nicole M. Hughes; William K. Smith. Leaf/shoot level ecophysiology in two broadleaf and two needle-leaf species under representative cloud regimes at alpine treeline. Journal of Plant Ecology 2016, 9, 762 -772.
AMA StyleAdriana Sanchez, Nicole M. Hughes, William K. Smith. Leaf/shoot level ecophysiology in two broadleaf and two needle-leaf species under representative cloud regimes at alpine treeline. Journal of Plant Ecology. 2016; 9 (6):762-772.
Chicago/Turabian StyleAdriana Sanchez; Nicole M. Hughes; William K. Smith. 2016. "Leaf/shoot level ecophysiology in two broadleaf and two needle-leaf species under representative cloud regimes at alpine treeline." Journal of Plant Ecology 9, no. 6: 762-772.
In the Neotropics, colonies of the ant Pseudomyrmex dendroicus are found in the hollow stems of Triplaris americana. The ants are obligate inhabitants of the ant-plant and they nest and reproduce exclusively in this myrmecophyte. However, this mutualistic association often involves a third partner, scale insects (Coccoidea, Hemiptera). Established colonies of this ant are always associated with scale insects and ants appear to be dependent on the honeydew excretions of their trophobionts. Acquisition of scale insects is therefore an important step in the successful establishment of a new colony. Domatia of juvenile host-plants were dissected to determine (1) how colonies are founded, (2) if there was evidence of co-dispersal between trophobionts and foundress queens. Colony foundation is claustral. Founding queens of Pseudomyrmex chew their entrance holes at the prostoma and then close the hole with debris. 104 queens were located with few or no workers. Of the 104 foundresses, 69 were found dead and only 32 had at least a single trophobiont. Although the association with trophobionts may prove vital to the establishment of the colony, these results indicate that scale insects do not seem to co-disperse with the foundress queens.
A. Sanchez. Establishing an ant-plant mutualism: foundress queen mortality and acquiring the third partner. Insectes Sociaux 2015, 63, 155 -162.
AMA StyleA. Sanchez. Establishing an ant-plant mutualism: foundress queen mortality and acquiring the third partner. Insectes Sociaux. 2015; 63 (1):155-162.
Chicago/Turabian StyleA. Sanchez. 2015. "Establishing an ant-plant mutualism: foundress queen mortality and acquiring the third partner." Insectes Sociaux 63, no. 1: 155-162.
The association between the myrmecophyte Triplaris and ants of the genus Pseudomyrmex is an often-reported example of mutualism but no molecular studies have examined this association to date. In this study, the interspecific relationships of Triplaris were reconstructed using five molecular markers (two chloroplast and three nuclear), and the relationships of the associated Pseudomyrmex using two molecular regions (one mitochondrial and one nuclear). A data set including all known collections of plant hosts and resident ants was also compiled. The pattern of distribution of both organisms reveals that there are varying degrees of host specificity; most ants show broader host usage (promiscuous) but one species (P. dendroicus) is faithful to a single species of Triplaris. In most ant-plant interactions, host usage is not specific at the species level and preferences may result from geographical or ecological sorting. The specificity of P. dendroicus could be based on chemical recognition of the host they were raised on.
Adriana Sánchez. Fidelity and Promiscuity in an Ant-Plant Mutualism: A Case Study of Triplaris and Pseudomyrmex. PLoS ONE 2015, 10, e0143535 .
AMA StyleAdriana Sánchez. Fidelity and Promiscuity in an Ant-Plant Mutualism: A Case Study of Triplaris and Pseudomyrmex. PLoS ONE. 2015; 10 (12):e0143535.
Chicago/Turabian StyleAdriana Sánchez. 2015. "Fidelity and Promiscuity in an Ant-Plant Mutualism: A Case Study of Triplaris and Pseudomyrmex." PLoS ONE 10, no. 12: e0143535.
Herbivory significantly impacts the growth and reproduction of plants. Many plants have developed ways to defend against herbivores and one common strategy is to associate with ants. In many ant-plant interactions, ants are known to protect their host. However, in the Neotropical ant-plant genus Triplaris, the benefits provided by associated ants have never been tested. Many Pseudomyrmex spp. ants are obligate inhabitants of Triplaris spp. trees. In this study, Triplaris americana was studied in association with Pseudomyrmex dendroicus, an ant highly specific to its host (it has not been collected from any other species of Triplaris). Ant exclusion experiments were carried out to assess the protective effect of ants. In addition, ant behavior was monitored in control plants to study the mechanisms by which ants might confer protection against herbivory. Ant removal led to a more than 15-fold increase in herbivory. Pseudomyrmex dendroicus are active at all times of day and night and aggressively and efficiently remove insect herbivores from their host.
Adriana Sanchez; Edwin Bellota. Protection against herbivory in the mutualism between Pseudomyrmex dendroicus (Formicidae) and Triplaris americana (Polygonaceae). Journal of Hymenoptera Research 2015, 46, 71 -83.
AMA StyleAdriana Sanchez, Edwin Bellota. Protection against herbivory in the mutualism between Pseudomyrmex dendroicus (Formicidae) and Triplaris americana (Polygonaceae). Journal of Hymenoptera Research. 2015; 46 ():71-83.
Chicago/Turabian StyleAdriana Sanchez; Edwin Bellota. 2015. "Protection against herbivory in the mutualism between Pseudomyrmex dendroicus (Formicidae) and Triplaris americana (Polygonaceae)." Journal of Hymenoptera Research 46, no. : 71-83.
Hernández-Ledesma P., Berendsohn W. G., Borsch Th., Mering S. von, Akhani H., Arias S., Castañeda-Noa I., Eggli U., Eriksson R., Flores-Olvera H., Fuentes-Bazán S., Kadereit G., Klak C., Korotkova N., Nyffeler R., Ocampo G., Ochoterena H., Oxelman B., Rabeler R. K., Sanchez A., Schlumpberger B. O. & Uotila P.: A taxonomic backbone for the global synthesis of species diversity in the angiosperm order Caryophyllales. — Willdenowia 45: 281–383. 2015. — Version of record first published online on 11 September 2015 ahead of inclusion in December 2015 issue; ISSN 1868-6397; © 2015 BGBM Berlin. DOI: http://dx.doi.org/10.3372/wi.45.45301 The Caryophyllales constitute a major lineage of flowering plants with approximately 12500 species in 39 families. A taxonomic backbone at the genus level is provided that reflects the current state of knowledge and accepts 749 genera for the order. A detailed review of the literature of the past two decades shows that enormous progress has been made in understanding overall phylogenetic relationships in Caryophyllales. The process of re-circumscribing families in order to be monophyletic appears to be largely complete and has led to the recognition of eight new families (Anacampserotaceae, Kewaceae, Limeaceae, Lophiocarpaceae, Macarthuriaceae, Microteaceae, Montiaceae and Talinaceae), while the phylogenetic evaluation of generic concepts is still well underway. As a result of this, the number of genera has increased by more than ten percent in comparison to the last complete treatments in the Families and genera of vascular plants” series. A checklist with all currently accepted genus names in Caryophyllales, as well as nomenclatural references, type names and synonymy is presented. Notes indicate how extensively the respective genera have been studied in a phylogenetic context. The most diverse families at the generic level are Cactaceae and Aizoaceae, but 28 families comprise only one to six genera. This synopsis represents a first step towards the aim of creating a global synthesis of the species diversity in the angiosperm order Caryophyllales integrating the work of numerous specialists around the world.
Patricia Hernández-Ledesma; Walter G. Berendsohn; Thomas Borsch; Sabine Von Mering; Hossein Akhani; Salvador Arias; Idelfonso Castañeda-Noa; Urs Eggli; Roger Eriksson; Hilda Flores-Olvera; Susy Fuentes-Bazán; Gudrun Kadereit; Cornelia Klak; Nadja Korotkova; Reto Nyffeler; Gilberto Ocampo; Helga Ochoterena; Bengt Oxelman; Richard K. Rabeler; Adriana Sanchez; Boris O. Schlumpberger; Pertti Uotila. A taxonomic backbone for the global synthesis of species diversity in the angiosperm orderCaryophyllales. Willdenowia 2015, 45, 281 .
AMA StylePatricia Hernández-Ledesma, Walter G. Berendsohn, Thomas Borsch, Sabine Von Mering, Hossein Akhani, Salvador Arias, Idelfonso Castañeda-Noa, Urs Eggli, Roger Eriksson, Hilda Flores-Olvera, Susy Fuentes-Bazán, Gudrun Kadereit, Cornelia Klak, Nadja Korotkova, Reto Nyffeler, Gilberto Ocampo, Helga Ochoterena, Bengt Oxelman, Richard K. Rabeler, Adriana Sanchez, Boris O. Schlumpberger, Pertti Uotila. A taxonomic backbone for the global synthesis of species diversity in the angiosperm orderCaryophyllales. Willdenowia. 2015; 45 (3):281.
Chicago/Turabian StylePatricia Hernández-Ledesma; Walter G. Berendsohn; Thomas Borsch; Sabine Von Mering; Hossein Akhani; Salvador Arias; Idelfonso Castañeda-Noa; Urs Eggli; Roger Eriksson; Hilda Flores-Olvera; Susy Fuentes-Bazán; Gudrun Kadereit; Cornelia Klak; Nadja Korotkova; Reto Nyffeler; Gilberto Ocampo; Helga Ochoterena; Bengt Oxelman; Richard K. Rabeler; Adriana Sanchez; Boris O. Schlumpberger; Pertti Uotila. 2015. "A taxonomic backbone for the global synthesis of species diversity in the angiosperm orderCaryophyllales." Willdenowia 45, no. 3: 281.
Alpine plants experience high levels of insolation, as well as cold nighttime temperatures throughout the summer growth period. These two stress factors in combination are now recognized as potentially important limitations to photosynthetic carbon gain. Although likely candidates, the possible occurrence of photoinhibition in alpine plants has been reported infrequently. We measured photoinhibitory stress under natural field conditions and after high-light treatments in an herbaceous species (Caltha leptosepala DC) with structural traits that appeared especially susceptible to photoinhibition, i.e., large, broad, laminar leaves with a near-horizontal leaf orientation. Although photosynthesis declined gradually during the afternoon under natural field conditions, no evidence was found for photoinhibition of photosynthesis, despite incident sunlight levels of >2500 µmol m−2 s−1. Also, values of \({{F_{\text{v}}^{{\prime }} } \mathord{\left/ {\vphantom {{F_{\text{v}}^{{\prime }} } {F_{\text{m}}^{{\prime }} }}} \right. \kern-0pt} {F_{\text{m}}^{{\prime }} }}\) (an indicator of dynamic photoinhibition) changed little (−2 s−1) followed by unnaturally high (3500 µmol m−2 s−1) light levels, led to only small reductions in \({{F_{\text{v}}^{{\prime }} } \mathord{\left/ {\vphantom {{F_{\text{v}}^{{\prime }} } {F_{\text{m}}^{{\prime }} }}} \right. \kern-0pt} {F_{\text{m}}^{{\prime }} }}\) (20 % maximum). Also, afternoon declines in photosynthesis and other gas exchange parameters were associated with significant decreases in xylem water potentials. Thus, accumulating daily water stress appeared to be a possible, greater physiological limitation than photoinhibition, even in this common, hypothetically susceptible alpine species.
Adriana Sanchez; William K. Smith. No evidence for photoinhibition of photosynthesis in alpine Caltha leptosepala DC. Alpine Botany 2015, 125, 41 -50.
AMA StyleAdriana Sanchez, William K. Smith. No evidence for photoinhibition of photosynthesis in alpine Caltha leptosepala DC. Alpine Botany. 2015; 125 (1):41-50.
Chicago/Turabian StyleAdriana Sanchez; William K. Smith. 2015. "No evidence for photoinhibition of photosynthesis in alpine Caltha leptosepala DC." Alpine Botany 125, no. 1: 41-50.
Nicole M. Hughes; Kaylyn L. Carpenter; David K. Cook; Timothy S. Keidel; Charlene N. Miller; Junior L. Neal; Adriana Sánchez; William K. Smith. Effects of cumulus clouds on microclimate and shoot-level photosynthetic gas exchange in Picea engelmannii and Abies lasiocarpa at treeline, Medicine Bow Mountains, Wyoming, USA. Agricultural and Forest Meteorology 2015, 201, 26 -37.
AMA StyleNicole M. Hughes, Kaylyn L. Carpenter, David K. Cook, Timothy S. Keidel, Charlene N. Miller, Junior L. Neal, Adriana Sánchez, William K. Smith. Effects of cumulus clouds on microclimate and shoot-level photosynthetic gas exchange in Picea engelmannii and Abies lasiocarpa at treeline, Medicine Bow Mountains, Wyoming, USA. Agricultural and Forest Meteorology. 2015; 201 ():26-37.
Chicago/Turabian StyleNicole M. Hughes; Kaylyn L. Carpenter; David K. Cook; Timothy S. Keidel; Charlene N. Miller; Junior L. Neal; Adriana Sánchez; William K. Smith. 2015. "Effects of cumulus clouds on microclimate and shoot-level photosynthetic gas exchange in Picea engelmannii and Abies lasiocarpa at treeline, Medicine Bow Mountains, Wyoming, USA." Agricultural and Forest Meteorology 201, no. : 26-37.
The south-central Rocky Mountains, USA, are characterised by a dry, continental mesoclimate with typical convective cloud formation during the afternoon. Little is known about the specific influence of such predictable cloud patterns on the microclimate and ecophysiology of associated species. During the summer of 2012, days with afternoon clouds were most common (50% of all days) compared with completely clear (24%) or cloudy days (6.5%). In two representative alpine species, Caltha leptosepala DC. and Arnica parryi A. Gray, fully overcast days reduced mean daily photosynthesis (A) by nearly 50% relative to fully clear days. Mean afternoon A was significantly lower on fully cloudy days relative to days with afternoon clouds only or no clouds in both species. Notably, A did not differ during afternoon cloud days relative to clear afternoons. Afternoon clouds significantly reduced transpiration (E) in C. leptosepala relative to clear days, and both species showed mean reductions in plant water stress (i.e. higher Ψ), though this difference was not significant. Water use efficiency (WUE) (A/E) decreased from morning to afternoon, especially on cloudy days, and the presence of clouds had a positive effect on the light reactions of photosynthesis based on fluorescence measurements (Fv′/Fm′), in both species. Cloudy days were characterised by higher Fv/Fm than afternoon clouds and clear days during both the morning and the afternoon (especially for A. parryi) and recovery to near pre-dawn values for cloudy and afternoon cloud day types, but not clear days. Overall, similar ecophysiological advantages of this typical afternoon cloud pattern was apparent in both species, although their spatial microsite differences related to winter snow accumulation may also play an important role.
Adriana Sánchez; Nicole M. Hughes; William K. Smith. Importance of natural cloud regimes to ecophysiology in the alpine species, Caltha leptosepala and Arnica parryi, Snowy Range Mountains, southeast Wyoming, USA. Functional Plant Biology 2015, 42, 186 -197.
AMA StyleAdriana Sánchez, Nicole M. Hughes, William K. Smith. Importance of natural cloud regimes to ecophysiology in the alpine species, Caltha leptosepala and Arnica parryi, Snowy Range Mountains, southeast Wyoming, USA. Functional Plant Biology. 2015; 42 (2):186-197.
Chicago/Turabian StyleAdriana Sánchez; Nicole M. Hughes; William K. Smith. 2015. "Importance of natural cloud regimes to ecophysiology in the alpine species, Caltha leptosepala and Arnica parryi, Snowy Range Mountains, southeast Wyoming, USA." Functional Plant Biology 42, no. 2: 186-197.
Adriana Sánchez; Juan M. Posada; William K. Smith. Dynamic Cloud Regimes, Incident Sunlight, and Leaf Temperatures inEspeletia grandifloraandChusquea tessellata, Two Representative Species of the Andean Páramo, Colombia. Arctic, Antarctic, and Alpine Research 2014, 46, 371 -378.
AMA StyleAdriana Sánchez, Juan M. Posada, William K. Smith. Dynamic Cloud Regimes, Incident Sunlight, and Leaf Temperatures inEspeletia grandifloraandChusquea tessellata, Two Representative Species of the Andean Páramo, Colombia. Arctic, Antarctic, and Alpine Research. 2014; 46 (2):371-378.
Chicago/Turabian StyleAdriana Sánchez; Juan M. Posada; William K. Smith. 2014. "Dynamic Cloud Regimes, Incident Sunlight, and Leaf Temperatures inEspeletia grandifloraandChusquea tessellata, Two Representative Species of the Andean Páramo, Colombia." Arctic, Antarctic, and Alpine Research 46, no. 2: 371-378.
During fall leaf senescence in deciduous species, photosynthesis nears completion due to chlorophyll breakdown and re-assimilation. However, several other processes such as leaf nutrient uptake, re-translocation, and storage, or tissue dehydration to avoid frost damage, may be important and dependent upon stomatal opening. We report here on measured changes in photosynthesis (A), leaf conductance to water vapor (g), and WUE (estimated by A/g) in three deciduous tree species (Acer saccharum, Cornus florida, and Ginkgo biloba) during the weeks of leaf senescence preceding abscission. Substantial decreases in A of 60 up to 80% were not matched quantitatively by similar declines in g (40 to 70%), resulting in corresponding decreases in WUE (estimated by A/g) from near 50% to over 300% among the three species. This shift to a lower WUE may reflect adaptive value in maintaining a higher g relative to A during the fall leaf senescence period.
Adriana Sánchez; Nicole M. Hughes; William K. Smith. Water-use efficiency declines during autumn leaf senescence in three deciduous tree species. International Journal of Plant Biology 2013, 4, e7 .
AMA StyleAdriana Sánchez, Nicole M. Hughes, William K. Smith. Water-use efficiency declines during autumn leaf senescence in three deciduous tree species. International Journal of Plant Biology. 2013; 4 (1):e7.
Chicago/Turabian StyleAdriana Sánchez; Nicole M. Hughes; William K. Smith. 2013. "Water-use efficiency declines during autumn leaf senescence in three deciduous tree species." International Journal of Plant Biology 4, no. 1: e7.
Recent phylogenetic studies have provided a revised hypothesis of the evolutionary relationships within Polygonaceae, particularly regarding placement of certain tropical taxa. Based on phylogenetic data, we recognize three subfamilies: Eriogonoideae, Polygonoideae, and Symmerioideae. Within the Eriogonoideae we accept six tribes, two of which, Leptogoneae and Gymnopodieae, are new.
Janelle M. Burke; Adriana Sánchez. Revised subfamily classification for Polygonaceae, with a tribal classification for Eriogonoideae. Brittonia 2011, 63, 510 -520.
AMA StyleJanelle M. Burke, Adriana Sánchez. Revised subfamily classification for Polygonaceae, with a tribal classification for Eriogonoideae. Brittonia. 2011; 63 (4):510-520.
Chicago/Turabian StyleJanelle M. Burke; Adriana Sánchez. 2011. "Revised subfamily classification for Polygonaceae, with a tribal classification for Eriogonoideae." Brittonia 63, no. 4: 510-520.
Adriana Sánchez; Kathleen A. Kron. Phylogenetic Relationships of Triplaris and Ruprechtia: Re-delimitation of the Recognized Genera and Two New Genera for Tribe Triplarideae (Polygonaceae). Systematic Botany 2011, 36, 702 -710.
AMA StyleAdriana Sánchez, Kathleen A. Kron. Phylogenetic Relationships of Triplaris and Ruprechtia: Re-delimitation of the Recognized Genera and Two New Genera for Tribe Triplarideae (Polygonaceae). Systematic Botany. 2011; 36 (3):702-710.
Chicago/Turabian StyleAdriana Sánchez; Kathleen A. Kron. 2011. "Phylogenetic Relationships of Triplaris and Ruprechtia: Re-delimitation of the Recognized Genera and Two New Genera for Tribe Triplarideae (Polygonaceae)." Systematic Botany 36, no. 3: 702-710.
The subfamily Polygonoideae has a world‐wide distribution and is an important component of many countries’ floras. In this study we present the most comprehensive sampling available to date, including data from three chloroplast genes (matK, ndhF, rbcL) for 82 species in Polygonaceae (54 from Polygonoideae). Based on our results, we propose a new taxonomic classification for Polygonoideae that includes five well‐supported tribes: Calligoneae, Fagopyreae, Persicarieae, Polygoneae, and Rumiceae. Overall, the results from molecular data represent significant progress in understanding the evolutionary relationships of major groups within the family. This classification also provides an assessment of diagnostic morphological characters for the tribes. The present work will promote reevaluation of morphological characters within this diverse group, especially synapomorphies for Polygonoideae, and for tribes with a particularly complex history such as Fagopyreae, Persicarieae, and Polygoneae. A new combination, Fagopyrum tibeticum, is proposed.
Adriana Sanchez; Tanja Schuster; Janelle M. Burke; Kathleen Kron. Taxonomy of Polygonoideae (Polygonaceae): A new tribal classification. TAXON 2011, 60, 151 -160.
AMA StyleAdriana Sanchez, Tanja Schuster, Janelle M. Burke, Kathleen Kron. Taxonomy of Polygonoideae (Polygonaceae): A new tribal classification. TAXON. 2011; 60 (1):151-160.
Chicago/Turabian StyleAdriana Sanchez; Tanja Schuster; Janelle M. Burke; Kathleen Kron. 2011. "Taxonomy of Polygonoideae (Polygonaceae): A new tribal classification." TAXON 60, no. 1: 151-160.
• Premise of the study: Taxonomic groups have often been recognized on the basis of geographic distinctions rather than accurately representing evolutionary relationships. This has been particularly true for temperate and tropical members from the same family. Polygonaceae exemplifies this problem, wherein the woody tropical genera were segregated from temperate members of the family and placed in the subfamily Polygonoideae as two tribes: Triplarideae and Coccolobeae. Modern phylogenetic studies, especially when inferred from many lines of evidence, can elucidate more probable hypotheses of relationships. This study builds on previous work in the family and aims to test the traditional classification of the tropical woody taxa, which have been understudied and undersampled compared to their temperate relatives.
Janelle M. Burke; Adriana Sanchez; Kathleen Kron; Melissa Luckow. Placing the woody tropical genera of Polygonaceae: A hypothesis of character evolution and phylogeny. American Journal of Botany 2010, 97, 1377 -1390.
AMA StyleJanelle M. Burke, Adriana Sanchez, Kathleen Kron, Melissa Luckow. Placing the woody tropical genera of Polygonaceae: A hypothesis of character evolution and phylogeny. American Journal of Botany. 2010; 97 (8):1377-1390.
Chicago/Turabian StyleJanelle M. Burke; Adriana Sanchez; Kathleen Kron; Melissa Luckow. 2010. "Placing the woody tropical genera of Polygonaceae: A hypothesis of character evolution and phylogeny." American Journal of Botany 97, no. 8: 1377-1390.
Adriana Sanchez; Tanja Schuster; Kathleen A. Kron. A Large‐Scale Phylogeny of Polygonaceae Based on Molecular Data. International Journal of Plant Sciences 2009, 170, 1044 -1055.
AMA StyleAdriana Sanchez, Tanja Schuster, Kathleen A. Kron. A Large‐Scale Phylogeny of Polygonaceae Based on Molecular Data. International Journal of Plant Sciences. 2009; 170 (8):1044-1055.
Chicago/Turabian StyleAdriana Sanchez; Tanja Schuster; Kathleen A. Kron. 2009. "A Large‐Scale Phylogeny of Polygonaceae Based on Molecular Data." International Journal of Plant Sciences 170, no. 8: 1044-1055.