2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | RIPARIAN VEGETATION STRUCTURE AND SEASONALITY INFLUENCE FUNCTIONAL DIVERSITY OF STREAM FISH ASSEMBLAGES IN THE COLOMBIAN AMAZON | Virtual Platform
RIPARIAN VEGETATION STRUCTURE AND SEASONALITY INFLUENCE FUNCTIONAL DIVERSITY OF STREAM FISH ASSEMBLAGES IN THE COLOMBIAN AMAZON
The Amazon rainforest has experienced extensive deforestation of riparian areas, putting at risk one of the most diverse freshwater fish assemblages on the planet. At nine study reaches distributed among three Colombian blackwater streams, we assessed how variability in riparian vegetation structure (i.e., canopy cover) influenced the taxonomic and functional diversity of fish assemblages during both dry and rainy seasons. We did not observe differences in taxonomic measures associated to changes in riparian canopy cover, including species richness and evenness. However, we observed that only 16% of species were observed in both rainy and dry seasons and that evenness was 8% greater in the dry season. Diet varied by riparian vegetation: 56% of fish stomach contents were of allochthonous origin in stream reaches with forest vegetation compared to 37% in streams with altered riparian vegetation. Both functional divergence and dispersion – measures of the variability of species’ traits – were higher in reaches with more intact vegetation during the rainy season. Our findings highlight the importance of the interaction of riparian vegetation and seasonality, and both longitudinal and lateral hydrological connectivity, for fish functional diversity of Amazonian streams.
- Ecosystem Dynamics
- Stream
- Ecosystem functioning
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Presenters/Authors
Angélica M. Torres Bejarano
(), Universidad Nacional de Colombia, angmtorresbej@unal.edu.co;
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S. Mažeika Patricio Sullivan
(), The Ohio State University, mazeika3@gmail.com ;
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Carlos Cáceres
(), The Ohio State University, carlos.l.caceres@gmail.com;
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Gabriel J. Colorado Z.
(), Universidad Nacional de Colombia, gjcoloradoz@unal.edu.co;
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