Evidence for the role of climate in the local extinction of a cool-water triclad
Climate change is expected to alter freshwater communities and accelerate extinction, but the exact processes are poorly known. Here, we appraise interannual variation between 2 sympatric planarians (Crenobia alpina and Phagocata vitta) in upland Welsh streams over 25 y during which 1 of this pair (...
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/35598/ http://www.bioone.org/doi/abs/10.1899/09-159.1 https://doi.org/10.1899/09-159.1 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:35598 2023-05-15T17:35:05+02:00 Evidence for the role of climate in the local extinction of a cool-water triclad Durance, Isabelle Ormerod, Stephen James 2010 https://orca.cardiff.ac.uk/id/eprint/35598/ http://www.bioone.org/doi/abs/10.1899/09-159.1 https://doi.org/10.1899/09-159.1 unknown BioOne Durance, Isabelle https://orca.cardiff.ac.uk/view/cardiffauthors/A016469X.html orcid:0000-0002-4138-3349 orcid:0000-0002-4138-3349 and Ormerod, Stephen James https://orca.cardiff.ac.uk/view/cardiffauthors/A035757Z.html orcid:0000-0002-8174-302X orcid:0000-0002-8174-302X 2010. Evidence for the role of climate in the local extinction of a cool-water triclad. Journal of the North American Benthological Society 29 (4) , pp. 1367-1378. 10.1899/09-159.1 https://doi.org/10.1899/09-159.1 doi:10.1899/09-159.1 Q Science (General) Article PeerReviewed 2010 ftunivcardiff https://doi.org/10.1899/09-159.1 2022-10-27T22:32:18Z Climate change is expected to alter freshwater communities and accelerate extinction, but the exact processes are poorly known. Here, we appraise interannual variation between 2 sympatric planarians (Crenobia alpina and Phagocata vitta) in upland Welsh streams over 25 y during which 1 of this pair (C. alpina) disappeared. We tested 3 nonexclusive hypotheses involving: 1) long-term changes in stream chemistry, 2) interspecific competition, and 3) climatic variation or directional change to explain this apparent local extinction. Several lines of evidence revealed potential exploitation competition between C. alpina and P. vitta. Coexistence was confined to conditions with high prey abundance (recorded as the abundance of Ephemeroptera, Plecoptera, and Trichoptera) and summer temperatures <12.5°C, whereas P. vitta dominated at sites with higher temperature, greater discharge, and lower prey abundance. The loss of C. alpina in the Llyn Brianne experimental catchments coincided with the largest-ever positive amplification of the North Atlantic Oscillation (NAO) in 1989 to 1994, accompanied by increased stream temperature, increased winter discharge, 2 summer droughts, and markedly reduced prey abundance. We suggest that interspecific competition and this prolonged climatic event acted in concert to favor P. vitta over C. alpina. Since its local loss, summer stream temperatures have generally exceeded the favorable range for C. alpina and, coupled with weak dispersal ability, probably explain its continued absence. Our data are consistent with the prediction that extreme climatic events will affect small, fluctuating populations. Nevertheless, this case study demonstrates clear difficulties in identifying unequivocally the exact climatic processes causing extinction where: 1) evidence is confined to weak inference, 2) responses to complex climatic events are nonlinear, 3) interactions occur among species or between climate and ecological processes, and 4) assessments are made retrospectively following extinctions. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Cardiff University: ORCA (Online Research @ Cardiff) Journal of the North American Benthological Society 29 4 1367 1378 |
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Cardiff University: ORCA (Online Research @ Cardiff) |
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Q Science (General) Durance, Isabelle Ormerod, Stephen James Evidence for the role of climate in the local extinction of a cool-water triclad |
topic_facet |
Q Science (General) |
description |
Climate change is expected to alter freshwater communities and accelerate extinction, but the exact processes are poorly known. Here, we appraise interannual variation between 2 sympatric planarians (Crenobia alpina and Phagocata vitta) in upland Welsh streams over 25 y during which 1 of this pair (C. alpina) disappeared. We tested 3 nonexclusive hypotheses involving: 1) long-term changes in stream chemistry, 2) interspecific competition, and 3) climatic variation or directional change to explain this apparent local extinction. Several lines of evidence revealed potential exploitation competition between C. alpina and P. vitta. Coexistence was confined to conditions with high prey abundance (recorded as the abundance of Ephemeroptera, Plecoptera, and Trichoptera) and summer temperatures <12.5°C, whereas P. vitta dominated at sites with higher temperature, greater discharge, and lower prey abundance. The loss of C. alpina in the Llyn Brianne experimental catchments coincided with the largest-ever positive amplification of the North Atlantic Oscillation (NAO) in 1989 to 1994, accompanied by increased stream temperature, increased winter discharge, 2 summer droughts, and markedly reduced prey abundance. We suggest that interspecific competition and this prolonged climatic event acted in concert to favor P. vitta over C. alpina. Since its local loss, summer stream temperatures have generally exceeded the favorable range for C. alpina and, coupled with weak dispersal ability, probably explain its continued absence. Our data are consistent with the prediction that extreme climatic events will affect small, fluctuating populations. Nevertheless, this case study demonstrates clear difficulties in identifying unequivocally the exact climatic processes causing extinction where: 1) evidence is confined to weak inference, 2) responses to complex climatic events are nonlinear, 3) interactions occur among species or between climate and ecological processes, and 4) assessments are made retrospectively following extinctions. |
format |
Article in Journal/Newspaper |
author |
Durance, Isabelle Ormerod, Stephen James |
author_facet |
Durance, Isabelle Ormerod, Stephen James |
author_sort |
Durance, Isabelle |
title |
Evidence for the role of climate in the local extinction of a cool-water triclad |
title_short |
Evidence for the role of climate in the local extinction of a cool-water triclad |
title_full |
Evidence for the role of climate in the local extinction of a cool-water triclad |
title_fullStr |
Evidence for the role of climate in the local extinction of a cool-water triclad |
title_full_unstemmed |
Evidence for the role of climate in the local extinction of a cool-water triclad |
title_sort |
evidence for the role of climate in the local extinction of a cool-water triclad |
publisher |
BioOne |
publishDate |
2010 |
url |
https://orca.cardiff.ac.uk/id/eprint/35598/ http://www.bioone.org/doi/abs/10.1899/09-159.1 https://doi.org/10.1899/09-159.1 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Durance, Isabelle https://orca.cardiff.ac.uk/view/cardiffauthors/A016469X.html orcid:0000-0002-4138-3349 orcid:0000-0002-4138-3349 and Ormerod, Stephen James https://orca.cardiff.ac.uk/view/cardiffauthors/A035757Z.html orcid:0000-0002-8174-302X orcid:0000-0002-8174-302X 2010. Evidence for the role of climate in the local extinction of a cool-water triclad. Journal of the North American Benthological Society 29 (4) , pp. 1367-1378. 10.1899/09-159.1 https://doi.org/10.1899/09-159.1 doi:10.1899/09-159.1 |
op_doi |
https://doi.org/10.1899/09-159.1 |
container_title |
Journal of the North American Benthological Society |
container_volume |
29 |
container_issue |
4 |
container_start_page |
1367 |
op_container_end_page |
1378 |
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1766134131447562240 |