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Size-structured risk assessments govern Daphnia migration.

Hansson, Lars-Anders LU and Hylander, Samuel LU (2009) In Royal Society of London. Proceedings B. Biological Sciences 276(1655). p.331-336
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ultraviolet radiation, Daphnia, zooplankton, migration, risk, predation
in
Royal Society of London. Proceedings B. Biological Sciences
volume
276
issue
1655
pages
331 - 336
publisher
Royal Society
external identifiers
  • wos:000262005200018
  • scopus:58149242623
ISSN
1471-2954
DOI
10.1098/rspb.2008.1088
project
CAnMove
language
English
LU publication?
yes
id
172f90c1-f8d2-4af1-b32e-bbb8b031a344 (old id 1242697)
date added to LUP
2009-03-06 13:16:42
date last changed
2017-04-23 04:04:31
@article{172f90c1-f8d2-4af1-b32e-bbb8b031a344,
  abstract     = {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.},
  author       = {Hansson, Lars-Anders and Hylander, Samuel},
  issn         = {1471-2954},
  keyword      = {ultraviolet radiation,Daphnia,zooplankton,migration,risk,predation},
  language     = {eng},
  number       = {1655},
  pages        = {331--336},
  publisher    = {Royal Society},
  series       = {Royal Society of London. Proceedings B. Biological Sciences},
  title        = {Size-structured risk assessments govern Daphnia migration.},
  url          = {http://dx.doi.org/10.1098/rspb.2008.1088},
  volume       = {276},
  year         = {2009},
}