2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 8:30 AM - 10:30 AM | Persist or perish: studying the appropriate temporal scales of hydrologic disturbances in relation to an organism’s life cycle. | Virtual Platform
Persist or perish: studying the appropriate temporal scales of hydrologic disturbances in relation to an organism’s life cycle.
Running water species have evolved traits that enable them to survive, exploit and even depend on the spatial and temporal variability of natural flow regimes. Human impacts have, however, altered these natural flow regimes. Disturbances outside the predictable flow regime to which stream organisms were originally adapted, can therefore reduce population densities. We hypothesized that a specific hydrologic disturbance leads to different ecological responses depending on the life stage of the exposed organism, as each life stage has different sensitivities to each specific stressor. To test this hypothesis, a two-year field study was performed in which we measured the discharge dynamics and population development of the caddisfly Agapetus fuscipes in four lowland streams. A stage-structured population model was used to test the impact of peak discharge on the different life stages. We showed that high discharge peaks during the early life stage of this caddisfly species can be fatal. To determine the impact of hydrologic changes on invertebrate population densities, it is thus crucial to study the appropriate temporal scales of the disturbances in relation to the critical periods in the life cycle of the exposed species.
- Stream
- Biological effects
- Anthropogenic
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Presenters/Authors
Gea van der Lee
(), Wageningen Environmental Research, gea.vanderlee@wur.nl;
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Michiel Kraak
(), Institute of Biodiversity and Ecosystem Dynamics, M.H.S.Kraak@uva.nl;
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Ralf C.M. Verdonschot
(), Wageningen Environmental Research, ralf.verdonschot@wur.nl;
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Piet F.M. Verdonschot
(), University of Amsterdam / Wageningen Environmental Research , piet.verdonschot@wur.nl;
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