2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

5/20/2019 | 9:30 AM - 9:45 AM | WHEN FLOW FOOD WEBS GET FISHY: SOME CHALLENGES AND OPPORTUNITIES | 250 DE

WHEN FLOW FOOD WEBS GET FISHY: SOME CHALLENGES AND OPPORTUNITIES

Energy-flow food web (FFW) approaches were developed and principally applied to stream invertebrates. Extended to fishes they yield challenges and opportunities that we evaluate in the context of case studies. Challenges of perception occur with the fisheries discipline, and include the idea that the approach is too laborious, a lack of understanding of production measures, a drift-feeding framework driven by a focus on salmonid fishes, and an existing paradigm of single-species bioenergetic models that may not translate well to communities. Real challenges include the need to adapt FFW calculations to fishes whose net production efficiencies change with size/age, concerns regarding fish movement and spatial origin of food resources, weighing sources of error in population estimates vs. error in FFW calculations, and tension between instantaneous measures of species interactions versus those integrated over longer time-steps. Opportunities include potential to reveal foodweb mechanisms responsible for responses by fish populations to management actions, investigate the likelihood of food limitation of fish populations, estimate the distribution and dynamics of interaction strengths in food webs that include fishes, and test general ecological theory using more complete, complex freshwater food webs.

Fish
Organic Matter
Biodiversity

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Presenters/Authors

Colden Baxter (), Idaho State University, baxtcold@isu.edu;