Title: Pesticide exposure impacts not only hatching of dormant eggs, but also hatchling survival and performance in the water flea Daphnia magna
Authors: Navis, Sabine ×
Waterkeyn, Aline
Voet, Tom
De Meester, Luc
Brendonck, Luc #
Issue Date: 10-May-2013
Publisher: Chapman & Hall
Series Title: Ecotoxicology vol:22 pages:804-814
Abstract: Laboratory ecotoxicity tests and biomonitoring
in aquatic systems are currently based on the active com-
ponent of invertebrate communities. Even though dormant
egg banks are crucial for the long term survival and com-
munity dynamics of many aquatic organisms, the effects of
anthropogenic activities on dormant egg bank dynamics
have rarely been studied. In this study we investigated the
effects of two pesticides with a different mode of action
(carbaryl and fenoxycarb) on hatching of Daphnia magna
dormant eggs (ephippia) as well as on survival, growth and
reproduction of the hatched neonates. Dormant eggs were
exposed to the pesticides simultaneously to incubation
under conditions that induce hatching (long daylight and
20°C). Carbaryl had no negative effects on embryonic
development or hatching rate up to concentrations almost
1,000 times the median effect concentration (EC50)of
neonate survival in acute tests. Fenoxycarb, however, had a
significant dose-related effect by delaying or completely
stopping the hatching process and caused severe abnor-
malities in developing individuals. Both pesticides had
significant negative effects on survival and reproduction of
the hatchlings. These results indicate that, in addition to
inducing mortality of active individuals, pesticides can
affect zooplankton communities by altering hatching
dynamics and life history traits of hatched individuals. We
briefly discuss how such pollution induced changes in
the benthic–pelagic coupling could translate into trans-
generational effects impacting ecological and evolutionary
ISSN: 0963-9292
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Ecology, Evolution and Biodiversity Conservation Section
× corresponding author
# (joint) last author

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