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Escape from UV threats in zooplankton: A cocktail of behavior and protective pigmentation

Author:
  • Lars-Anders Hansson
  • Samuel Hylander
  • Ruben Sommaruga
Publishing year: 2007
Language: English
Pages: 1932-1939
Publication/Series: Ecology
Volume: 88
Issue: 8
Document type: Journal article
Publisher: Ecological Society of America

Abstract english

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.

Keywords

  • Ecology
  • ultraviolet
  • trait compensation
  • pigment
  • phenotypic plasticity
  • acid
  • mycosporine-like amino
  • limnology
  • lakes
  • Daphnia
  • carotenoid
  • copepod
  • radiation
  • UV radiation
  • zooplankton

Other

Published
  • ISSN: 0012-9658
Lars-Anders Hansson
E-mail: lars-anders [dot] hansson [at] biol [dot] lu [dot] se

Professor

Aquatic ecology

+46 46 222 41 69

E-C140

50

Professor

NanoLund

14

Research group

Aquatic Ecology

Other projects I´m involved in

Doctoral students and postdocs

PhD students, main supervisor

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