2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2018 | 10:15 AM - 10:30 AM | DIFFERENTIAL EFFECTS OF BYTHOTREPHES LONGIMANUS ON POPULATION GROWTH RATES OF LAKE MICHIGAN ZOOPLANKTON SPECIES | 410 A

DIFFERENTIAL EFFECTS OF BYTHOTREPHES LONGIMANUS ON POPULATION GROWTH RATES OF LAKE MICHIGAN ZOOPLANKTON SPECIES

Aquatic food webs have been dramatically altered by the introduction of nonindigenous species. For instance, shortly after its introduction into the Great Lakes, the non-native predatory zooplankter, Bythotrephes longimanus, is thought to have significantly changed the community structure of mesozooplankton. However, ongoing effects of B. longimanus on zooplankton community structure and dynamics are not well understood and can be difficult to disentangle from other factors (e.g., seasonality). To address this gap, we used generalized additive models to examine the effects of B. longimanus on estimated specific growth rates for common species in Lake Michigan, generated from long-term, offshore time series data (1994-2012). Our results suggest that zooplankton species differ in the occurrence and magnitude of B. longimanus effects, with observed differences consistent with expectations based on experimental measurements of consumptive and nonconsumptive effects of B. longimanus. Estimated reductions in growth rate (e.g., estimated 20% reduction in Daphnia mendotae population growth) likely alter the availability of these species as prey for important prey fish. Our results thus provide valuable, field-based evidence for ongoing impacts of this invader in Lake Michigan, with potential consequences for ecosystem-scale processes.

Predator-prey
Population
Great Lakes

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Presenters/Authors

John Marino (), Bradley University, jmarino@fsmail.bradley.edu;