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Condition-dependent individual decision-making determines cyprinid partial migration

Brodersen, Jakob LU ; Brönmark, Christer LU ; Nilsson, Anders LU ; Skov, Christian LU and Hansson, Lars-Anders LU (2008) In Ecology 89(5). p.1195-1200
Abstract
Partial migration is a common phenomenon among many animals and occurs in many types of ecosystems. Understanding the mechanisms behind partial migration is of major importance for the understanding of population dynamics and, eventually, ecosystem processes. We studied the effects of food availability on the seasonal partial migration of cyprinid fish from a lake to connected streams during winter by the use of passive telemetry. Fish with increased access to food were found to migrate in higher proportion, earlier in the season, and to reside in the streams for a longer period compared to fish with decreased access to food. Furthermore, fewer unfed migrants returned to the lake, indicating higher overwinter mortality. Our results suggest... (More)
Partial migration is a common phenomenon among many animals and occurs in many types of ecosystems. Understanding the mechanisms behind partial migration is of major importance for the understanding of population dynamics and, eventually, ecosystem processes. We studied the effects of food availability on the seasonal partial migration of cyprinid fish from a lake to connected streams during winter by the use of passive telemetry. Fish with increased access to food were found to migrate in higher proportion, earlier in the season, and to reside in the streams for a longer period compared to fish with decreased access to food. Furthermore, fewer unfed migrants returned to the lake, indicating higher overwinter mortality. Our results suggest that individual fish trade off safety from predation and access to food differently depending on their body condition, which results in a condition-dependent partial migration. Hence, our main conclusion is that individual decision-making is based on assessment of own condition which offers a mechanistic explanation to partial migration. Moreover, this may be of high importance for understanding population responses to environmental variation as well as ecosystem dynamics and stability. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ecology
volume
89
issue
5
pages
1195 - 1200
publisher
Ecological Society of America
external identifiers
  • wos:000256101200003
  • scopus:46749094637
ISSN
0012-9658
DOI
10.1890/07-1318.1
project
CAnMove
language
English
LU publication?
yes
id
b0217922-5eab-4bac-b266-0351cbeaba08 (old id 934116)
date added to LUP
2008-01-17 13:43:13
date last changed
2017-08-27 04:38:11
@article{b0217922-5eab-4bac-b266-0351cbeaba08,
  abstract     = {Partial migration is a common phenomenon among many animals and occurs in many types of ecosystems. Understanding the mechanisms behind partial migration is of major importance for the understanding of population dynamics and, eventually, ecosystem processes. We studied the effects of food availability on the seasonal partial migration of cyprinid fish from a lake to connected streams during winter by the use of passive telemetry. Fish with increased access to food were found to migrate in higher proportion, earlier in the season, and to reside in the streams for a longer period compared to fish with decreased access to food. Furthermore, fewer unfed migrants returned to the lake, indicating higher overwinter mortality. Our results suggest that individual fish trade off safety from predation and access to food differently depending on their body condition, which results in a condition-dependent partial migration. Hence, our main conclusion is that individual decision-making is based on assessment of own condition which offers a mechanistic explanation to partial migration. Moreover, this may be of high importance for understanding population responses to environmental variation as well as ecosystem dynamics and stability.},
  author       = {Brodersen, Jakob and Brönmark, Christer and Nilsson, Anders and Skov, Christian and Hansson, Lars-Anders},
  issn         = {0012-9658},
  language     = {eng},
  number       = {5},
  pages        = {1195--1200},
  publisher    = {Ecological Society of America},
  series       = {Ecology},
  title        = {Condition-dependent individual decision-making determines cyprinid partial migration},
  url          = {http://dx.doi.org/10.1890/07-1318.1},
  volume       = {89},
  year         = {2008},
}