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Induced tolerance expressed as relaxed behavioural threat response in millimetre-sized aquatic organisms
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (MPEA ; Zooplankton Ecology)ORCID iD: 0000-0002-3740-5998
Lund Univ.
Lund Univ.
Lund Univ.
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2014 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 281, no 1788, Article ID: 20140364- p.Article in journal (Refereed) Published
Abstract [en]

Natural selection shapes behaviour in all organisms, but this is difficult to study in small, millimetre-sized, organisms. With novel labelling and tracking techniques, based on nanotechnology, we here show how behaviour in zooplankton (Daphnia magna) is affected by size, morphology and previous exposure to detrimental ultraviolet radiation (UVR). All individuals responded with immediate downward swimming to UVR exposure, but when released from the threat they rapidly returned to the surface. Large individuals swam faster and generally travelled longer distances than small individuals. Interestingly, individuals previously exposed to UVR (during several generations) showed a more relaxed response to UVR and travelled shorter total distances than those that were naive to UVR, suggesting induced tolerance to the threat. In addition, animals previously exposed to UVR also had smaller eyes than the naive ones, whereas UVR-protective melanin pigmentation of the animals was similar between populations. Finally, we show that smaller individuals have lower capacity to avoid UVR which could explain patterns in natural systems of lower migration amplitudes in small individuals. The ability to change behavioural patterns in response to a threat, in this case UVR, adds to our understanding of how organisms navigate in the ‘landscape of fear’, and this has important implications for individual fitness and for interaction strengths in biotic interactions.

Place, publisher, year, edition, pages
2014. Vol. 281, no 1788, Article ID: 20140364- p.
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-35642DOI: 10.1098/rspb.2014.0364ISI: 000338637600006OAI: oai:DiVA.org:lnu-35642DiVA: diva2:729556
Available from: 2014-06-26 Created: 2014-06-26 Last updated: 2016-11-28Bibliographically approved

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Hylander, Samuel
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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  • asciidoc
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