2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/07/2017 | 9:45 AM - 10:00 AM | FOOD WEBS, COMMUNITY ASSEMBLAGES, AND ORGANISMAL STOICHIOMETRY ALONG ENVIRONMENTAL GRADIENTS IN TWO MESOAMERICAN RIVER NETWORKS | 306B

FOOD WEBS, COMMUNITY ASSEMBLAGES, AND ORGANISMAL STOICHIOMETRY ALONG ENVIRONMENTAL GRADIENTS IN TWO MESOAMERICAN RIVER NETWORKS

The Grijalva-Usumacinta watershed is a center of freshwater biodiversity and endemism in southern Mexico. Our objectives were to survey aquatic assemblages, examine feeding ecology of fishes, and investigate patterns in fish tissue stoichiometry in two large Mesoamerican rivers--the Grijalva and the Usumacinta. The rivers are subject to different types and intensities of development and drain diverse terrestrial ecosystems. Additionally, the Usumacinta is currently undammed, while the Grijalva has several large impoundments. We compared habitats in the main-stem rivers and in smaller tributaries. We observed remarkable fish diversity in the Usumacinta basin, whereas fish diversity was lower in reaches of the Grijalva basin. Furthermore, stable isotope analysis revealed fish production in the main stem of the Río Usumacinta was supported by a broader variety of food resources compared to the Río Grijalva. We did not document striking patterns in organismal stoichiometry in fishes with broad distributions in either river. Our results suggest the natural flow regime in the Usumacinta promoted resource diversity by maintaining habitat heterogeneity and providing connectivity to riparian forests and the natural flow regime of the Usumacinta supports the diversity and value of fisheries in the river.

S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems
C25 Food Webs
S09 The importance of environmental gradients for the advance of tropical stream ecology

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Presenters/Authors

Krista Capps (), University of Georgia, kcapps@uga.edu;