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Are fish populations in temperate streams affected by crayfish? - A field survey and prospects

Degerman, E; Nilsson, Anders LU ; Nyström, Per LU ; Nilsson, Erika LU and Olsson, Karin LU (2007) In Environmental Biology of Fishes 78(3). p.231-239
Abstract
Fish populations may be affected by predation and competition from various types of organisms, among which crayfish have been suggested as important actors. We here present results from stream surveys, suggesting that neither native noble, Astacus astacus, nor introduced signal crayfish, Pacifastacus leniusculus, necessarily affect fish population densities in temperate stream communities. Comparisons of fish densities within stream sites between years with absence and presence of crayfish showed no effect of either crayfish species. A further analysis of changes in fish densities between periods without and with crayfish in low, intermediate and high densities revealed that crayfish density did neither have an effect on fish densities.... (More)
Fish populations may be affected by predation and competition from various types of organisms, among which crayfish have been suggested as important actors. We here present results from stream surveys, suggesting that neither native noble, Astacus astacus, nor introduced signal crayfish, Pacifastacus leniusculus, necessarily affect fish population densities in temperate stream communities. Comparisons of fish densities within stream sites between years with absence and presence of crayfish showed no effect of either crayfish species. A further analysis of changes in fish densities between periods without and with crayfish in low, intermediate and high densities revealed that crayfish density did neither have an effect on fish densities. Our study is one of exceptionally few that consider the above aspects in long-term perspectives in natural systems, and we discuss that previously reported divergent results of cray. sh effects on. sh may be highly dependent on specific species and methods used, and that the effects of cray. sh on. sh populations deserve further attention to enable reliable predictions of community processes in streams. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Biology of Fishes
volume
78
issue
3
pages
231 - 239
publisher
Springer
external identifiers
  • wos:000244190500011
  • scopus:33846991582
ISSN
0378-1909
DOI
10.1007/s10641-006-0041-1
language
English
LU publication?
yes
id
af1e00de-bbb1-41d7-ab8e-6aae7cd66e8c (old id 167163)
date added to LUP
2007-06-28 13:04:58
date last changed
2017-10-29 03:43:33
@article{af1e00de-bbb1-41d7-ab8e-6aae7cd66e8c,
  abstract     = {Fish populations may be affected by predation and competition from various types of organisms, among which crayfish have been suggested as important actors. We here present results from stream surveys, suggesting that neither native noble, Astacus astacus, nor introduced signal crayfish, Pacifastacus leniusculus, necessarily affect fish population densities in temperate stream communities. Comparisons of fish densities within stream sites between years with absence and presence of crayfish showed no effect of either crayfish species. A further analysis of changes in fish densities between periods without and with crayfish in low, intermediate and high densities revealed that crayfish density did neither have an effect on fish densities. Our study is one of exceptionally few that consider the above aspects in long-term perspectives in natural systems, and we discuss that previously reported divergent results of cray. sh effects on. sh may be highly dependent on specific species and methods used, and that the effects of cray. sh on. sh populations deserve further attention to enable reliable predictions of community processes in streams.},
  author       = {Degerman, E and Nilsson, Anders and Nyström, Per and Nilsson, Erika and Olsson, Karin},
  issn         = {0378-1909},
  language     = {eng},
  number       = {3},
  pages        = {231--239},
  publisher    = {Springer},
  series       = {Environmental Biology of Fishes},
  title        = {Are fish populations in temperate streams affected by crayfish? - A field survey and prospects},
  url          = {http://dx.doi.org/10.1007/s10641-006-0041-1},
  volume       = {78},
  year         = {2007},
}