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Size-structured risk assessments govern Daphnia migration.

In English

Författare

Summary, in English

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.

Publiceringsår

2009

Språk

Engelska

Sidor

331-336

Publikation/Tidskrift/Serie

Royal Society of London. Proceedings B. Biological Sciences

Volym

276

Issue

1655

Dokumenttyp

Artikel i tidskrift

Förlag

Royal Society Publishing

Ämne

  • Ecology

Nyckelord

  • ultraviolet radiation
  • Daphnia
  • zooplankton
  • migration
  • risk
  • predation

Status

Published

Forskningsgrupp

  • Aquatic Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1471-2954