EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/20/2019 | 11:15 AM - 11:30 AM | TROPHIC STRUCTURE OF FISH ASSEMBLAGES ACROSS RIVER CONTINUA: CHALLENGES AND OPPORTUNITIES FOR BIOASSESSMENT | 151 G
TROPHIC STRUCTURE OF FISH ASSEMBLAGES ACROSS RIVER CONTINUA: CHALLENGES AND OPPORTUNITIES FOR BIOASSESSMENT
In large stream networks, feeding ecology of fish species and the breadth of food resources used by assemblages are influenced by a great deal of variation in physiography, climate, flow conditions and ecosystem size. Because assessments of trophic diversity are often used for evaluating ecological integrity of habitats, an understanding of this variation is essential. The River Continuum Concept and other theories regarding longitudinal shifts in food resource use provide expectations for trophic structure of fish assemblages that may apply across regions, but exceptions to these expectations have revealed important challenges. For example, natural climatic differences within large river basins may influence trophic diversity of fish assemblages in streams with similar network positions and elevations. In many systems, expected shifts in resources are interrupted by flow alteration, which causes discontinuities in spatial patterns of geomorphology, discharge, and food resource availability in ways that may be difficult to predict. Promising areas for future research to reveal patterns of trophic structure of fish assemblages across river continua include investigations in under-studied biomes, examinations of temporal variation, and measurements of the extent of individual specialization across habitats.
- Food Webs
- Bioassessment
- Aquatic-terrestrial Linkage
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Presenters/Authors
Allison Pease
(), Texas Tech University, allison.pease@ttu.edu ;
ASHA DISCLOSURE:
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