Translating bioassay results to field population responses using a Leslie-matrix model for the marine amphipod Corophium volutator
| Autor: | Martine J. van den Heuvel-Greve, Belinda J. Kater, Mathijs G.D. Smit, Robbert G. Jak |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
reproductive-biology
wadden sea Population Leslie matrix Biology shorebird predation Predation Bioassay Population growth RIVO Centrum voor Schelpdierenonderzoek education substrate selection education.field_of_study Ecology Ecological Modeling life-history toxicity benthic amphipod biology.organism_classification arenarium crustacea Wageningen Marine Research contaminated dredged material Population model Natural population growth in-situ Corophium volutator |
| Zdroj: | Ecological Modelling, 196(3-4), 515-526 Ecological Modelling 196 (2006) 3-4 |
| ISSN: | 0304-3800 |
| DOI: | 10.1016/j.ecolmodel.2006.02.006 |
| Popis: | Bioassays can be used for the assessment of sediment contamination. The response is classified based on a statistical scale indicating a certain effect percentage being significantly different from the controls (e.g. mortality classes of 0–10%, 10–20% etc.). The ecological relevance of this statistical scale is low. Extrapolating the observed mortality to population success could facilitate the development of a more ecological relevant scale. By incorporating the results of bioassays in population models, the consequences of the presence of contaminants can be studied at the population level. Based on a Leslie matrix combined with mathematical modelling of important biological processes, a population model is developed for Corophium volutator , a marine amphipod used in sediment bioassays. A literature review is carried out to specify reproduction, growth, mortality and predation and the way these factors depend on temperature and food availability. This resulted in a model describing the population development (population growth rate) of C. volutator . Field data of the C. volutator population in the Oesterput, a location in the Dutch Eastern Scheldt estuary, are applied to study the capability of the model to describe a field population. For populations tested in bioassays, without food limitation and predation, increasing population sizes (population growth rate ( λ ) >1) are predicted between +6.5 °C and +30.0 °C. Mortality observed in bioassays will reduce λ . Using a realistic temperature profile, a maximum allowable bioassay response of 30.5% reducing λ to a value of 1 was determined. However, also external factors like predation and food limitation will reduce the value of λ . This hampers the definition of a generic threshold based on population effects. The developed model forms a useful intermediate in the translation of bioassay effects to population effects for C. volutator . Not only does the model provide new information about the sensitivity of test organisms and thus contributes to reducing uncertainty in test results, but it provides a means to increase the ecological relevance of bioassays responses. These latter capabilities are valuable to the regulation authorities. |
| Databáze: | OpenAIRE |
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