NDLI: Life history trade-offs and stress tolerance in green hydra (Hydra viridissima Pallas 1766): the importance of nutritional status and perceived population density

Content Provider	Springer Nature Link
Author	Tökölyi, Jácint Rosa, Márta E. Bradács, Flóra Barta, Zoltán
Copyright Year	2014
Abstract	Clonally reproducing animals, such as freshwater hydra, can achieve very quick population growth, potentially resulting in high density when dispersal is limited. The reproductive value of any offspring produced clonally in such a high density population is low because of the strong competition for food. Therefore, animals experiencing such conditions should allocate their resources to self-maintenance, to increase survival chances. Increased allocation to self-maintenance in turn should enable animals to withstand higher levels of genotoxic stress. To test this prediction, we exposed green hydra (Hydra viridissima Pallas 1766) to a perceived high density (by keeping them in crowded culture medium) or low density (fresh culture medium) without altering food availability. We also manipulated nutritional status (by starving animals for different time periods) and previous exposure to mild stress in a full factorial experimental design. At the end of the experiment we exposed animals to a high concentration of hydrogen-peroxide and scored stress tolerance. We found that stress tolerance is greatly elevated in animals perceiving high density, confirming our prediction. Stress tolerance decreased in animals starved for a few days, suggesting that the ability to maintain an elevated stress tolerance function has nutritional costs and is possible only when resource availability is high. On the other hand, previous exposure to mild stress had a small effect on the ability to tolerate subsequent exposure to stress, and only in the low density treatment group. Thus, stress tolerance in hydra is dynamically modulated in response to social, environmental and nutritional cues.
Starting Page	867
Ending Page	876
Page Count	10
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	29
Issue Number	5
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2014-07-02
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Asexual reproduction Density dependence Somatic maintenance Life-history evolution Oxidative stress Ecology Plant Sciences Zoology Evolutionary Biology Behavioural Sciences Forestry
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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