2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 12:15 PM - 12:30 PM | NEOTROPICAL CLOUD-FOREST STREAMS: MACROINVERTEBRATE REGIME SHIFTS, FOOD WEBS, AND CONSEQUENCES OF NON-NATIVE RAINBOW TROUT | 420 A
NEOTROPICAL CLOUD-FOREST STREAMS: MACROINVERTEBRATE REGIME SHIFTS, FOOD WEBS, AND CONSEQUENCES OF NON-NATIVE RAINBOW TROUT
The structure and function of cloud-forest Neotropical streams is becoming clearer, and ongoing research is particularly relevant given their propensity for harboring unique, endemic species. However, there is much that remains unknown. For the past five years, we explored the shift in benthic macroinvertebrate communities in several headwater Neotropical cloud-forest streams in Ecuador, examined food web structure using stable-isotopes, and looked at the potential impacts from the presence of non-native rainbow trout (Oncorhynchus mykiss). Results indicated a significant yearly variation in the macroinvertebrate communities (% similarity ranged from 27-50) and significant variation in the most abundant taxa as well. Multivariate analysis indicated that there was not significant variation in physicochemical characteristics, suggesting natural variation in response to yearly differences in precipitation and/or highly dynamic communities. Analysis of functional attributes (feeding guilds) indicated a prevalence predators and low number of shredders-consistent with previous studies in the Neotropics, and stable isotope signatures suggested N-limitation and a closer overlap between scraping guilds and FPOM rather than periphyton. Finally, streams with vs. without trout farms had more pollution-tolerant macroinvertebrate taxa. Ongoing work explores the decomposition rates in rainbow trout vs. non-rainbow trout streams.
- Invertebrate
- Biodiversity
- Disturbance
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Presenters/Authors
Eric Snyder
(), Grand Valley State University, snydeeri@gvsu.edu;
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Anna Harris
(), Canadian Organization for Tropical Education & Rainforest Conservation, a.harrianna@gmail.com;
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Dana Wessels
(), Grand Valley State University, wesselsd@mail.gvsu.edu;
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