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Title: Biochemical adaptation for dormancy in subitaneous and dormant eggs of Daphnia magna
Authors: Pauwels, Kevin ×
Stoks, Robby
Verbiest, Anne
De Meester, Luc #
Issue Date: Dec-2007
Publisher: Springer
Series Title: Hydrobiologia vol:594 pages:91-96
Abstract: Daphnia can reproduce through subitaneous and dormant eggs. The production of dormant eggs is induced by stimuli associated with deteriorating growth conditions, and enable Daphnia populations to survive temporarily harsh environmental conditions. Dormant eggs are expected to have developed special biochemical adaptations to bridge this long unfavourable period, but little comparative biochemical data are available for dormant and subitaneous eggs. We compared levels of the following molecules between subitaneous and dormant eggs: (a) triglycerides, which are the most abundant energy storage molecules in Daphnia, (b) glycerol, a cryoprotectant also involved in energy storage, and (c) the heat shock protein Hsp60, a molecular chaperone that may assist in maintaining protein structural integrity and inhibiting cell metabolism during diapause. Unexpectedly, no difference in triglycerides content between egg types was found. As expected, dormant eggs contained more glycerol and relatively more Hsp60 than subitaneous eggs. The biochemical composition of dormant eggs can therefore be seen as an adaptation to the harsh environmental conditions these eggs encounter.
URI: 
ISSN: 0018-8158
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Aquatic Ecology and Evolutionary Biology (-)
Ecology, Evolution and Biodiversity Conservation Section
× corresponding author
# (joint) last author

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