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Predicting harvest of non-native signal crayfish in lakes —a role for changing climate?

Bohman, Patrik; Edsman, Lennart; Sandström, Alfred; Nyström, Per LU ; Stenberg, Marika LU ; Hertonsson, Pia LU and Johansson, Jacob LU (2016) In Canadian Journal of Fisheries and Aquatic Sciences 73(5). p.785-792
Abstract

The signal crayfish (Pacifastacus leniusculus) was introduced to Sweden in 1960, and it has a high commercial and recreational value, but it may also have negative effects on native ecosystems. To better predict how climate warming will affect population dynamics of this cool-water crayfish, we explored the role of temperature and density dependence as explanatory factors of the subsequent years’ catch rates of commercially sized signal crayfish in four Swedish lakes. We found air temperatures to be good proxies for water temperatures in all lakes, except during winter. We could only obtain water temperature data for Lake Vättern, and winter temperature data were therefore only included in the analysis of catch-per-unit-effort patterns... (More)

The signal crayfish (Pacifastacus leniusculus) was introduced to Sweden in 1960, and it has a high commercial and recreational value, but it may also have negative effects on native ecosystems. To better predict how climate warming will affect population dynamics of this cool-water crayfish, we explored the role of temperature and density dependence as explanatory factors of the subsequent years’ catch rates of commercially sized signal crayfish in four Swedish lakes. We found air temperatures to be good proxies for water temperatures in all lakes, except during winter. We could only obtain water temperature data for Lake Vättern, and winter temperature data were therefore only included in the analysis of catch-per-unit-effort patterns in this lake. Our results indicate that increasing mean air temperatures will potentially affect the population dynamics of coolwater freshwater crayfish species such as the signal crayfish. Based on data from four lakes, it seems that the population dynamics of signal crayfish are lake-specific and could be affected by either recruitment during the juvenile stage, the survival and growth of adults, or both. Increased fluctuations in water temperature during winter may potentially influence adult survival. To better predict the effects of global warming on the dynamics of cool-water crayfish populations, we suggest that future studies should investigate recruitment in crayfish along temperature gradients and the influence of variations in water temperature on winter mortality.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Canadian Journal of Fisheries and Aquatic Sciences
volume
73
issue
5
pages
8 pages
publisher
National Research Council Canada
external identifiers
  • scopus:84989227655
  • wos:000375425900006
ISSN
0706-652X
DOI
10.1139/cjfas-2015-0241
language
English
LU publication?
yes
id
6b701938-8c0b-482f-82ae-b714d52b80d5
date added to LUP
2017-02-16 11:25:22
date last changed
2017-09-24 05:07:19
@article{6b701938-8c0b-482f-82ae-b714d52b80d5,
  abstract     = {<p>The signal crayfish (Pacifastacus leniusculus) was introduced to Sweden in 1960, and it has a high commercial and recreational value, but it may also have negative effects on native ecosystems. To better predict how climate warming will affect population dynamics of this cool-water crayfish, we explored the role of temperature and density dependence as explanatory factors of the subsequent years’ catch rates of commercially sized signal crayfish in four Swedish lakes. We found air temperatures to be good proxies for water temperatures in all lakes, except during winter. We could only obtain water temperature data for Lake Vättern, and winter temperature data were therefore only included in the analysis of catch-per-unit-effort patterns in this lake. Our results indicate that increasing mean air temperatures will potentially affect the population dynamics of coolwater freshwater crayfish species such as the signal crayfish. Based on data from four lakes, it seems that the population dynamics of signal crayfish are lake-specific and could be affected by either recruitment during the juvenile stage, the survival and growth of adults, or both. Increased fluctuations in water temperature during winter may potentially influence adult survival. To better predict the effects of global warming on the dynamics of cool-water crayfish populations, we suggest that future studies should investigate recruitment in crayfish along temperature gradients and the influence of variations in water temperature on winter mortality.</p>},
  author       = {Bohman, Patrik and Edsman, Lennart and Sandström, Alfred and Nyström, Per and Stenberg, Marika and Hertonsson, Pia and Johansson, Jacob},
  issn         = {0706-652X},
  language     = {eng},
  number       = {5},
  pages        = {785--792},
  publisher    = {National Research Council Canada},
  series       = {Canadian Journal of Fisheries and Aquatic Sciences},
  title        = {Predicting harvest of non-native signal crayfish in lakes —a role for changing climate?},
  url          = {http://dx.doi.org/10.1139/cjfas-2015-0241},
  volume       = {73},
  year         = {2016},
}