Abstract
Daphnia pulex respond to water-borne chemicals released by predatory phantom midge larvae (Chaoborus spp.) with adaptive life-history and morphological responses. These responses can be modified by some classes of pesticides. The aim of this study was to measure the effects of a cyclodiene pesticide, endosulfan, on the Chaoborus-induced responses of D.pulex. Chaoborus induced the development of neckteeth, a faster growth rate, larger size at maturity, and higher fecundity in D.pulex. There was no evidence of any costs associated with neckteeth production except a small increase in age at maturity. Endosulfan was lethal to free-swimming D.pulex only at 300 μg l-1, but caused significant mortality to embryos at concentrations as low as 0.1 μg l-1. It inhibited the development of neckteeth at 100 μg l-1, and reduced the growth rate of the induced morph at concentrations ≥0.1 μg l-1. Endosulfan had a unimodal effect on the expression of neckteeth in maternally-exposed daphnids, with maximal inhibition at intermediate concentrations. Endosulfan increased the number of neckteeth only in the first instar of maternally-exposed neonates at 200 μg l-1. More generally, the results of this study suggest that anthropogenic pollution may inhibit phenotypic plasticity, indirectly limiting the temporal and spatial range of affected species.
| Original language | English |
|---|---|
| Pages (from-to) | 1705-1718 |
| Number of pages | 14 |
| Journal | Journal of Plankton Research |
| Volume | 22 |
| Issue number | 9 |
| Publication status | Published - 2000 |
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ASJC Scopus subject areas
- Aquatic Science
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Effects of endosulfan on Chaoborus-induced life-history shifts and morphological defenses in Daphnia pulex. / Barry, Michael J.
In: Journal of Plankton Research, Vol. 22, No. 9, 2000, p. 1705-1718.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of endosulfan on Chaoborus-induced life-history shifts and morphological defenses in Daphnia pulex
AU - Barry, Michael J.
PY - 2000
Y1 - 2000
N2 - Daphnia pulex respond to water-borne chemicals released by predatory phantom midge larvae (Chaoborus spp.) with adaptive life-history and morphological responses. These responses can be modified by some classes of pesticides. The aim of this study was to measure the effects of a cyclodiene pesticide, endosulfan, on the Chaoborus-induced responses of D.pulex. Chaoborus induced the development of neckteeth, a faster growth rate, larger size at maturity, and higher fecundity in D.pulex. There was no evidence of any costs associated with neckteeth production except a small increase in age at maturity. Endosulfan was lethal to free-swimming D.pulex only at 300 μg l-1, but caused significant mortality to embryos at concentrations as low as 0.1 μg l-1. It inhibited the development of neckteeth at 100 μg l-1, and reduced the growth rate of the induced morph at concentrations ≥0.1 μg l-1. Endosulfan had a unimodal effect on the expression of neckteeth in maternally-exposed daphnids, with maximal inhibition at intermediate concentrations. Endosulfan increased the number of neckteeth only in the first instar of maternally-exposed neonates at 200 μg l-1. More generally, the results of this study suggest that anthropogenic pollution may inhibit phenotypic plasticity, indirectly limiting the temporal and spatial range of affected species.
AB - Daphnia pulex respond to water-borne chemicals released by predatory phantom midge larvae (Chaoborus spp.) with adaptive life-history and morphological responses. These responses can be modified by some classes of pesticides. The aim of this study was to measure the effects of a cyclodiene pesticide, endosulfan, on the Chaoborus-induced responses of D.pulex. Chaoborus induced the development of neckteeth, a faster growth rate, larger size at maturity, and higher fecundity in D.pulex. There was no evidence of any costs associated with neckteeth production except a small increase in age at maturity. Endosulfan was lethal to free-swimming D.pulex only at 300 μg l-1, but caused significant mortality to embryos at concentrations as low as 0.1 μg l-1. It inhibited the development of neckteeth at 100 μg l-1, and reduced the growth rate of the induced morph at concentrations ≥0.1 μg l-1. Endosulfan had a unimodal effect on the expression of neckteeth in maternally-exposed daphnids, with maximal inhibition at intermediate concentrations. Endosulfan increased the number of neckteeth only in the first instar of maternally-exposed neonates at 200 μg l-1. More generally, the results of this study suggest that anthropogenic pollution may inhibit phenotypic plasticity, indirectly limiting the temporal and spatial range of affected species.
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UR - http://www.scopus.com/inward/citedby.url?scp=0033813336&partnerID=8YFLogxK
M3 - Article
VL - 22
SP - 1705
EP - 1718
JO - Journal of Plankton Research
JF - Journal of Plankton Research
SN - 0142-7873
IS - 9
ER -