2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | INFLUENCE OF ABIOTIC VARIABLES ON THE DISTRIBUTION OF FUNCTIONAL FEEDING GROUPS IN A SMALL ORDER HIGHLAND RIVER, COSTA RICA | Virtual Platform
INFLUENCE OF ABIOTIC VARIABLES ON THE DISTRIBUTION OF FUNCTIONAL FEEDING GROUPS IN A SMALL ORDER HIGHLAND RIVER, COSTA RICA
Knowledge about functional feeding groups (FFG) facilitates our understanding on trophic dynamics and energy flow. Abiotic variables such as canopy cover, current velocity and pool area can affect the composition of freshwater communities. The objective of this study was to determine how the previously mentioned abiotic factors influenced the FFG of macroinvertebrates in a neotropical highland habitat in Costa Rica. We expected to find collectors and detritivores in dense canopy covered areas; filters associated with high current velocity and predators in wider pools and generalists in every context. Ten pools in a first order stream were sampled using physical disturbance for 2 minutes, macroinvertebrates were collected in a fine mesh (<2 µm) and sorted into their respective feeding functional group. We evaluated the relationship between FFG and abiotic factors (i.e., canopy cover, current velocity and pool area) using a RLQ analysis. We found a positive effect of canopy cover on herbivores and scrappers; current velocity on generalists and collectors; pool area on predators, detritivores and filters. Although most of the groups did follow the predicted patterns those who didn’t might be explained by adaptability to habitat pressures.
- Ecosystem functioning
- Female scientists
- Stream
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Presenters/Authors
Beatriz Antillón
(), Universidad de Costa Rica, beatriz.antillon@ucr.ac.cr;
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