Document Detail

Escape from UV threats in zooplankton: a cocktail of behavior and protective pigmentation.
MedLine Citation:
PMID:  17824423     Owner:  NLM     Status:  MEDLINE    
In order to avoid environmental threats, organisms may respond by altering behavior or phenotype. Using experiments performed in high-latitude Siberia and in temperate Sweden, we show for the first time that, among freshwater crustacean zooplankton, the defense against threats from ultraviolet radiation (UV) is a system where phenotypic plasticity and behavioral escape mechanisms function as complementary traits. Freshwater copepods relied mainly on accumulating protective pigments when exposed to UV radiation, but Daphnia showed strong behavioral responses. Pigment levels for both Daphnia and copepods were generally higher at higher latitudes, mirroring different UV threat levels. When released from the UV threat, Daphnia rapidly reduced (within 10 days) their UV protecting pigmentation-by as much as 40%--suggesting a cost in maintaining UV protective pigmentation. The evolutionary advantage of protective pigments is, likely, the ability to utilize the whole water column during daytime; conversely, since the amount of algal food is generally higher in surface waters, unpigmented individuals are restricted to a less preferred feeding habitat in deeper waters. Our main conclusion is that different zooplankton taxa, and similar taxa at different latitudes, use different mixes of behavior and pigments to respond to UV radiation.
Lars-Anders Hansson; Samuel Hylander; Ruben Sommaruga
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ecology     Volume:  88     ISSN:  0012-9658     ISO Abbreviation:  Ecology     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-09-10     Completed Date:  2007-10-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043541     Medline TA:  Ecology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1932-9     Citation Subset:  IM    
Institute of Ecology/Limnology, Lund University, Lund SE-223 62 Sweden.
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MeSH Terms
Adaptation, Physiological*
Feeding Behavior / physiology
Pigmentation / physiology*
Ultraviolet Rays / adverse effects*
Zooplankton / physiology*,  radiation effects*

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