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The influence of predator regime on the behaviour and mortality of a freshwater amphipod, Gammarus pulex

Ahlgren, Johan LU ; Åbjörnsson, Kajsa LU and Brönmark, Christer LU (2011) In Hydrobiologia 671(1). p.39-49
Abstract
In species with restricted dispersal, traits may become genetically fixed leading to local adaptations. Therefore, predator avoidance in a prey species may differ between populations experiencing different predator regimes, but also between sexes within a population due to different vulnerability to predators. In this study we used male and female Gammarus pulex from two different predator regimes: fishless ponds, where invertebrates are the dominant predators and ponds with predatory fish. In the laboratory we examined refuge use, mortality, leaf decomposition rate and pair-formation in G. pulex when exposed to predator cues from either invertebrate predators or fish. Individuals from fish ponds spent more time in refuge and had a higher... (More)
In species with restricted dispersal, traits may become genetically fixed leading to local adaptations. Therefore, predator avoidance in a prey species may differ between populations experiencing different predator regimes, but also between sexes within a population due to different vulnerability to predators. In this study we used male and female Gammarus pulex from two different predator regimes: fishless ponds, where invertebrates are the dominant predators and ponds with predatory fish. In the laboratory we examined refuge use, mortality, leaf decomposition rate and pair-formation in G. pulex when exposed to predator cues from either invertebrate predators or fish. Individuals from fish ponds spent more time in refuge and had a higher mortality than those from fishless ponds independent of predator cues. There was no effect of pond predator regime or predator cues on leaf decomposition rates. Further, fewer individuals formed pairs in G. pulex from fish ponds than from fishless ponds. Male G. pulex had a higher mortality and a higher decomposition rate than females independent of predator cues. However, there was no difference in refuge use between sexes. Our study shows that there are general differences in behaviour traits, both between predator regimes and sexes in G. pulex. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Local adaptations – Refuge use – Mortality – Predator regime – Pair-formation – Gammarus pulex
in
Hydrobiologia
volume
671
issue
1
pages
39 - 49
publisher
Springer
external identifiers
  • wos:000291740900004
  • scopus:79959254993
ISSN
0018-8158
DOI
10.1007/s10750-011-0702-8
language
English
LU publication?
yes
id
72eeb4b5-ae97-4825-8999-ecbb97a0c792 (old id 1980492)
date added to LUP
2011-08-22 12:50:36
date last changed
2017-01-01 04:15:59
@article{72eeb4b5-ae97-4825-8999-ecbb97a0c792,
  abstract     = {In species with restricted dispersal, traits may become genetically fixed leading to local adaptations. Therefore, predator avoidance in a prey species may differ between populations experiencing different predator regimes, but also between sexes within a population due to different vulnerability to predators. In this study we used male and female Gammarus pulex from two different predator regimes: fishless ponds, where invertebrates are the dominant predators and ponds with predatory fish. In the laboratory we examined refuge use, mortality, leaf decomposition rate and pair-formation in G. pulex when exposed to predator cues from either invertebrate predators or fish. Individuals from fish ponds spent more time in refuge and had a higher mortality than those from fishless ponds independent of predator cues. There was no effect of pond predator regime or predator cues on leaf decomposition rates. Further, fewer individuals formed pairs in G. pulex from fish ponds than from fishless ponds. Male G. pulex had a higher mortality and a higher decomposition rate than females independent of predator cues. However, there was no difference in refuge use between sexes. Our study shows that there are general differences in behaviour traits, both between predator regimes and sexes in G. pulex.},
  author       = {Ahlgren, Johan and Åbjörnsson, Kajsa and Brönmark, Christer},
  issn         = {0018-8158},
  keyword      = {Local adaptations – Refuge use – Mortality – Predator regime – Pair-formation – Gammarus pulex},
  language     = {eng},
  number       = {1},
  pages        = {39--49},
  publisher    = {Springer},
  series       = {Hydrobiologia},
  title        = {The influence of predator regime on the behaviour and mortality of a freshwater amphipod, Gammarus pulex},
  url          = {http://dx.doi.org/10.1007/s10750-011-0702-8},
  volume       = {671},
  year         = {2011},
}