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  Life-history responses of Daphnia pulicaria to diets containing freshwater diatoms: Effects of nutritional quality versus polyunsaturated aldehydes

Carotenuto, Y., Wichard, T., Pohnert, G., & Lampert, W. (2005). Life-history responses of Daphnia pulicaria to diets containing freshwater diatoms: Effects of nutritional quality versus polyunsaturated aldehydes. Limnology and Oceanography, 50(2), 449-454.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D9E4-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D9E5-5
Genre: Journal Article

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carotenuto_2005.pdf (Publisher version), 83KB
 
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Carotenuto, Ylenia1, Author              
Wichard, Thomas, Author
Pohnert, Georg, Author
Lampert, Winfried1, Author              
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1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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 Abstract: Like marine diatoms, some freshwater diatoms produce alpha, beta, gamma, delta-polyunsaturated aldehydes (PUA) when damaged. Some of these oxylipins are suspected of impairing egg viability in marine copepods. To determine whether these compounds also play a role in influencing the trophic interactions in freshwater environments, we measured growth and reproduction of the cladoceran Daphnia pulicaria in response to diets composed of seven diatoms differing in PUA production. The juvenile growth rate of Daphnia varied with the diatom species, but was not related to oxylipin production. Egg hatching success was nearly 100% in all clutches for all diets, except with a diet of the decadienal producing Fragilaria sp., where it decreased dramatically in clutches 5-7. In vitro tests of egg hatching in the presence of PUA showed a dose-dependent inhibition for decadienal. Population parameters (i.e., life-time fecundity and instantaneous rate of population growth) were not affected by PUA, as the contribution of late clutches to them was negligible. Consequently, the wound-activated production of PUA by diatoms cannot be regarded as a defensive mechanism against Daphnia population recruitment.

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Language(s): eng - English
 Dates: 2005-03
 Publication Status: Published in print
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 Identifiers: eDoc: 217950
Other: 2379/S 38357
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Title: Limnology and Oceanography
  Alternative Title : Limnol. Oceanogr.
Source Genre: Journal
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Pages: - Volume / Issue: 50 (2) Sequence Number: - Start / End Page: 449 - 454 Identifier: ISSN: 0024-3590