Combined exposure to parasite and pesticide causes increased mortality in the water flea Daphnia
Organisms are exposed to multiple biotic and abiotic environmental stressors, which can influence the dynamics of individual populations and communities. Populations may also genetically adapt to both natural (e.g. disease) and anthropogenic (e.g. chemical pollution) stress. In the present study, we...
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Veröffentlicht in: | Aquatic ecology 2012-06, Vol.46 (2), p.261-268 |
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Sprache: | eng |
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Zusammenfassung: | Organisms are exposed to multiple biotic and abiotic environmental stressors, which can influence the dynamics of individual populations and communities. Populations may also genetically adapt to both natural (e.g. disease) and anthropogenic (e.g. chemical pollution) stress. In the present study, we studied fitness consequences of exposure to both a parasite (i.e. biotic) and a pesticide (i.e. abiotic) for the water flea
Daphnia.
In addition, we investigated whether these fitness consequences change through time as a population evolves. Thus, we exposed
Daphnia magna
clones, hatched from dormant eggs isolated from different time layers of a natural dormant egg bank, to the parasite
Pasteuria ramosa
and the insecticide diazinon in a multifactorial experiment. While our experimental treatments for unknown reasons failed to induce disease symptoms in the
Daphnia
, we did observe a reduced survival of
D. magna
when simultaneously exposed to both the parasite and the pesticide. No increased mortality upon exposure to individual stressors was observed. We did not observe an evolutionary change in fitness response of the
Daphnia
clones hatched from different time horizons upon exposure to stressors. |
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ISSN: | 1386-2588 1573-5125 |
DOI: | 10.1007/s10452-012-9397-9 |