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Size-structured risk assessments govern Daphnia migration
Lunds universitet.
Lunds universitet. (MPEA ; Zooplankton Ecology)ORCID iD: 0000-0002-3740-5998
2009 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 276, no 1655, 331-336 p.Article in journal (Refereed) Published
Abstract [en]

One of the more fascinating phenomena in nature is animal mass migrations and in oceans and freshwaters, diel variations in depth distribution of zooplankton are a phenomenon that has intrigued scientists for more than a century. In our study, we show that zooplankton are able to assess the threat level of ultraviolet radiation and adjust their depth distribution to this level at a very fine tuned scale. Moreover, predation risk induces a size-structured depth separation, such that small individuals, which we show are less vulnerable to predation than larger, make a risk assessment and continue feeding in surface waters during day, offering a competitive release from down-migrating larger animals. Hence, we mechanistically show that such simple organisms as invertebrate zooplankton are able to make individual, size-specific decisions regarding how to compromise between threats from both predators and UV radiation, and adjust their diel migratory patterns accordingly.

Place, publisher, year, edition, pages
2009. Vol. 276, no 1655, 331-336 p.
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-28706DOI: 10.1098/rspb.2008.1088ISI: 000262005200018OAI: oai:DiVA.org:lnu-28706DiVA: diva2:650946
Available from: 2013-09-24 Created: 2013-09-05 Last updated: 2017-12-06Bibliographically approved

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Hylander, Samuel

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