2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 11:00 AM - 11:15 AM | FOOD WEB DYNAMICS ON BRANCHING RIVER NETWORKS | 305A
FOOD WEB DYNAMICS ON BRANCHING RIVER NETWORKS
River geometry influences processes such as population persistence, genetic structure, and species diversity. Most related previous work has focused on within trophic-level dynamics, with less emphasis on food web interactions. Yet, river food webs are influenced by processes that may interact with network structure and position. Using spatially-explicit predator-prey models, we explore how trophic dynamics are influenced by the branching nature of river networks. Our models are capable of producing many patterns, including stability, fluctuations, and extinctions. In cases where the predator-prey interaction is prone to cycles and local extinctions, the influence of network structure and dispersal can increase regional persistence and community stability. Regional stability results from asynchrony among dynamics of local habitats: when asynchronous local fluctuations are averaged, predatory-prey dynamics and persistence become less variable at larger spatial scales. Fluctuations synchronize across clusters of linked local habitats; headwater branches typically vary independently of other patches and show high variability, while mainstem habitats show greater clustering and less variability. These patterns suggest than headwater versus mainstem locations in river networks may show differential responses to management and restoration efforts.
- C11 Community Ecology
- C25 Food Webs
- S21 Practical applications of metacommunity theory in stream and river management
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Presenters/Authors
Kurt Anderson
(), University of California, Riverside, kurt.anderson@ucr.edu;
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Sean Hayes
(), University of California, Riverside, sean.hayes@email.ucr.edu;
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