NDLI: Seasonal changes in lipid composition and glycogen storage associated with freeze-tolerance of the earthworm, Dendrobaena octaedra

Content Provider	Springer Nature Link
Author	Overgaard, Johannes Tollarova, Michaela Hedlund, Katarina Petersen, Søren O. Holmstrup, Martin
Copyright Year	2009
Abstract	The earthworm, Dendrobaena octaedra, is a common species in the uppermost soil and humus layers of coniferous forests and tundra in temperate and subarctic regions. The species is freeze-tolerant and may survive several months in a frozen state. Upon freezing, glycogen reserves are rapidly converted to glucose serving as a cryoprotectant and fuel for metabolism. In the present study we investigated the induction of freeze-tolerance under field conditions, and sought to find relationships between temperature, glycogen and fat reserves, membrane phospholipid composition and the degree of freeze-tolerance. Freeze-tolerance was induced when worms had experienced temperatures below 5°C for 2 weeks or more. Freeze-tolerance was linked to the magnitude of glycogen reserves, which also fluctuated with field temperatures being highest in autumn and winter. On the other hand fat reserves seemed not to be linked with freeze-tolerance at all. However, high glycogen alone did not confer freeze-tolerance; alterations in the membrane phospholipid fatty acid composition (PLFA) were also necessary in order to secure freeze-tolerance. The changes in PLFA composition were generally similar to changes occurring in other ectothermic animals during winter acclimation with an increased degree of unsaturation of the PLFAs.
Starting Page	569
Ending Page	577
Page Count	9
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	179
Issue Number	5
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-01-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Earthworms Freeze-tolerance Glycogen Membrane lipids Winter temperatures Animal Physiology Biomedicine general Zoology Human Physiology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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