The prediction of water temperatures in chalk streams from air temperatures |
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Authors: | A P Mackey A D Berrie |
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Institution: | (1) Department of Zoology, University of Otago, Dunedin, New Zealand;(2) Present address: Department of Biology, Nankai University, Tianjin, China |
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Abstract: | The transmission of Epistylis daphniae infection among Boeckella triarticulata and the effect of peritrich epizoites on the copepod hosts were examined at 15 °C in the laboratory. After being paired with carrier copepodites, 97.5% of non-carrier adults became hosts to E. daphniae. When food was present there was no difference between carriers and non-carriers in growth of copepodites, and in survival and reproduction of adults. When food was absent, copepods infected with E. daphniae survived for shorter periods than non-carriers (p < 0.002). Therefore, colonial peritrichs may contribute to the decline of copepod populations when they are in a food-limited environment. |
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Keywords: | Epistylis daphniae Boeckella triarticulata peritrich epizoites freshwater copepod infection |
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