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Life history elasticity and the population‐level effect of p ‐nonylphenol on Daphnia galeata by Yoshinari Tanaka; Junko Nakanishi is a Environmental Science article available to read on EtoBox.

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In order to evaluate population‐level effects of __p__‐nonylphenol on a cladoceran zooplankton (__Daphnia galeata__), the chronic effects on survival and reproduction were estimated with partial life table tests, which examined responses in life history characters until 3 weeks after birth. The observed responses in survival and reproduction were converted to reductions of the intrinsic rate of natural increase __r__. The population level EC~50~, which is defined as the exposure concentration that reduces __r__ by 50%, was estimated as 16.1 μg l^−1^. In order to examine the extent to which the population‐level effect in terms of __r__ is influenced by extra mortality in nature, which is induced by predation, starvation, etc., sensitivity (elasticity) measures of the intrinsic rate of natural increase to reductions in age‐specific survival and reproduction were calculated under hypothetical predation schemes. The sensitivities of the intrinsic rate to changes in survival and reproduction invariably decline rapidly after the onset of reproduction irrespective of predation schemes. This implies that partial life cycle tests until 21 days after birth can provide reliable estimates of t

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Author

Yoshinari Tanaka; Junko Nakanishi

Publisher

Springer; Wiley (Blackwell Publishing); Springer Verlag; Wiley (ISSN 0912-3814)

Published

2001

Language

EN

Field

Environmental Science (Physical Sciences)