Diversity patterns of aquatic macroinvertebrates in a tropical high-Andean catchment
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad de Costa Rica
2020
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| _version_ | 1876460795451146240 |
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| author | Rodrigo Espinosa |
| author_facet | Rodrigo Espinosa |
| contents | Diversity patterns of aquatic macroinvertebrates in a tropical high-Andean catchment Rodrigo Espinosa Patricio Andino Sophie Cauvy-Fraunié Olivier Dangles Dean Jacobsen Verónica Crespo-Pérez Biología kryal krenal rarity rhithral glacierised catchments Introduction: Glacierised catchments are remote and hostile environments, in which streams from different water sources (e.g., glacier melt, rain/snowmelt, groundwater) converge, creating a complex mosaic of stream sites with varying levels of glacial influence and environmental conditions. This environmental heterogeneity, in turn, influences the assemblage and composition of aquatic communities and produces complex patterns of species diversity at the catchment scale. Objectives: In this contribution, we assessed biodiversity and community composition of aquatic macroinvertebrate communities from 51 stream site types in a glacierised catchment in the tropical Andes. The aim of our study was to: (1) determine diversity, rarity, commonness and spatial distribution patterns of aquatic macroinvertebrate communities from sites with different water sources, and (2) identify which environmental variables influence the density and presence of macroinvertebrate taxa and, in particular, of the subfamilies of the ubiquitous chironomids.Methods: Our study sites were grouped according to their water source and to their percentage of glacier coverage in the catchment (GCC). At each site we sampled aquatic macroinvertebrates, measured environmental variables and assessed community differences and environmental influence with ordination analyses and generalized linear models.Results: Kryal and mixed sites had an important proportion of rare taxa. Mean richness was highest in the mixed sites and lowest in the sites with the highest glacier cover; while sites with an intermediate percentage of glacier cover, had the highest values of α and β diversity. We found that 13 taxa (15.9%) were common to all stream site types. SIMPER analysis showed that Orthocladiinae, Hyalella sp. and Andesiops sp. contributed the most to the dissimilarity between site types (˃ 45% of cumulative contribution). RDA showed that kryal sites were associated with high turbidity and density of Podonomids, and with low temperature, amount of CPOM and densities of both Anomalocosmoecus sp. and Andesiops sp. Orthocladinae was associated with high current velocity and chlorophyll a concentration, whereas Hyalella sp. had a positive relationship with higher pH and streambed stability. Generalized linear models showed that GCC was the main variable explaining all faunal metrics. Current velocity explained macroinvertebrate abundance, water temperature was related to chironomid density and chlorophyll a influenced Orthocladiinae presence-absence.Conclusions: Our results suggest that by favoring the presence of rare taxa and taxa turnover, glacier influence may increase biodiversity in glacierised catchments. In terms of biodiversity conservation, this study confirms an urgent need to increase knowledge of high-Andean stream biodiversity, especially in highly heterogenous glacierised catchments, to better describe regional biodiversity patterns and community composition of these highly vulnerable f 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44967850003 https://www.redalyc.org/journal/449/44967850003/ https://www.redalyc.org/journal/449/44967850003/html/ https://www.redalyc.org/journal/449/44967850003/44967850003.epub https://www.redalyc.org/journal/449/44967850003/movil 10.15517/RBT.V68IS2.44331 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.68 |
| format | Artículo científico |
| id | redalyc_44967850003 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Diversity patterns of aquatic macroinvertebrates in a tropical high-Andean catchment Rodrigo Espinosa Biología kryal krenal rarity rhithral glacierised catchments Diversity patterns of aquatic macroinvertebrates in a tropical high-Andean catchment Rodrigo Espinosa Patricio Andino Sophie Cauvy-Fraunié Olivier Dangles Dean Jacobsen Verónica Crespo-Pérez Biología kryal krenal rarity rhithral glacierised catchments Introduction: Glacierised catchments are remote and hostile environments, in which streams from different water sources (e.g., glacier melt, rain/snowmelt, groundwater) converge, creating a complex mosaic of stream sites with varying levels of glacial influence and environmental conditions. This environmental heterogeneity, in turn, influences the assemblage and composition of aquatic communities and produces complex patterns of species diversity at the catchment scale. Objectives: In this contribution, we assessed biodiversity and community composition of aquatic macroinvertebrate communities from 51 stream site types in a glacierised catchment in the tropical Andes. The aim of our study was to: (1) determine diversity, rarity, commonness and spatial distribution patterns of aquatic macroinvertebrate communities from sites with different water sources, and (2) identify which environmental variables influence the density and presence of macroinvertebrate taxa and, in particular, of the subfamilies of the ubiquitous chironomids.Methods: Our study sites were grouped according to their water source and to their percentage of glacier coverage in the catchment (GCC). At each site we sampled aquatic macroinvertebrates, measured environmental variables and assessed community differences and environmental influence with ordination analyses and generalized linear models.Results: Kryal and mixed sites had an important proportion of rare taxa. Mean richness was highest in the mixed sites and lowest in the sites with the highest glacier cover; while sites with an intermediate percentage of glacier cover, had the highest values of α and β diversity. We found that 13 taxa (15.9%) were common to all stream site types. SIMPER analysis showed that Orthocladiinae, Hyalella sp. and Andesiops sp. contributed the most to the dissimilarity between site types (˃ 45% of cumulative contribution). RDA showed that kryal sites were associated with high turbidity and density of Podonomids, and with low temperature, amount of CPOM and densities of both Anomalocosmoecus sp. and Andesiops sp. Orthocladinae was associated with high current velocity and chlorophyll a concentration, whereas Hyalella sp. had a positive relationship with higher pH and streambed stability. Generalized linear models showed that GCC was the main variable explaining all faunal metrics. Current velocity explained macroinvertebrate abundance, water temperature was related to chironomid density and chlorophyll a influenced Orthocladiinae presence-absence.Conclusions: Our results suggest that by favoring the presence of rare taxa and taxa turnover, glacier influence may increase biodiversity in glacierised catchments. In terms of biodiversity conservation, this study confirms an urgent need to increase knowledge of high-Andean stream biodiversity, especially in highly heterogenous glacierised catchments, to better describe regional biodiversity patterns and community composition of these highly vulnerable f 2020 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44967850003 https://www.redalyc.org/journal/449/44967850003/ https://www.redalyc.org/journal/449/44967850003/html/ https://www.redalyc.org/journal/449/44967850003/44967850003.epub https://www.redalyc.org/journal/449/44967850003/movil 10.15517/RBT.V68IS2.44331 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.68 |
| title | Diversity patterns of aquatic macroinvertebrates in a tropical high-Andean catchment |
| topic | Biología kryal krenal rarity rhithral glacierised catchments |
| url | https://www.redalyc.org/articulo.oa?id=44967850003 https://www.redalyc.org/journal/449/44967850003/ https://www.redalyc.org/journal/449/44967850003/html/ https://www.redalyc.org/journal/449/44967850003/44967850003.epub https://www.redalyc.org/journal/449/44967850003/movil |