EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/07/2017 | 10:15 AM - 10:30 AM | INTRODUCED ONCHORYNCHUS MYKISS ALTER INSTREAM NUTRIENT CYCLING IN THE NAPO RIVER BASIN, ECUADOR | 306B
INTRODUCED ONCHORYNCHUS MYKISS ALTER INSTREAM NUTRIENT CYCLING IN THE NAPO RIVER BASIN, ECUADOR
Astroblepus a genus of catfish (order Siluriformes) and the sole genus of the family Astroblepidae, were historically abundant in highland streams throughout the tropical Andes up to elevations of 3500m. However, since the introduction of rainbow trout (Onchorynchus mykiss) into the region, Astroblepus have been displaced to lower elevations and are rarely found in sympatry with rainbow trout. Beyond the direct effect of displacing Astroblepus, rainbow trout introductions in the tropical highlands also indirectly affect ecosystem function through altered nutrient storage and cycling. We examined the influence of introduced rainbow trout populations on nutrient storage and cycling relative to native Astroblepus vaillanti populations along an elevational gradient (2500m-1000m) in the Napo River Basin of Ecuador. Our preliminary results indicate that rainbow trout populations contribute a significantly higher nitrogen subsidy relative to Astroblepus populations through excretion, indicating potential alteration of instream nitrogen cycling. We did not find a significant difference for soluble reactive phosphorus subsidies between the two populations.
- S09 The importance of environmental gradients for the advance of tropical stream ecology
- S09 The importance of environmental gradients for the advance of tropical stream ecology
- S09 The importance of environmental gradients for the advance of tropical stream ecology
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Presenters/Authors
Alexander Alexiades
(), Heritage University, alexiades_a@heritage.edu;
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Andrea C. Encalada
(), Instituto BIOSFERA, Universidad San Francisco de Quito, Cumbayá, Ecuador Biológicas y Ambientales, Universidad San Francisco de Quito, Cumbaya, Ecuador, aencalada@usfq.edu.ec;
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Alexander Flecker
(), Cornell University, Ithaca, NY, USA, asf3@cornell.edu;
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