Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation
Climate warming can affect ecological food chains directly by increasing the rates of physiological processes and indirectly by changing habitat use and altering predator–prey interactions. In Lake Maggiore, Italy, a greater than 10-fold increase in the mean annual population density of Bythotrephes...
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ftindianaunivpfw:oai:opus.ipfw.edu:biology_facpubs-1066 2023-05-15T17:35:38+02:00 Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation Manca, M. DeMott, William R., Ph.D. 2009-01-01T08:00:00Z application/pdf http://opus.ipfw.edu/biology_facpubs/67 http://opus.ipfw.edu/cgi/viewcontent.cgi?article=1066&context=biology_facpubs unknown Opus: Research & Creativity at IPFW Biology Faculty Publications Biology text 2009 ftindianaunivpfw 2016-12-27T07:40:15Z Climate warming can affect ecological food chains directly by increasing the rates of physiological processes and indirectly by changing habitat use and altering predator–prey interactions. In Lake Maggiore, Italy, a greater than 10-fold increase in the mean annual population density of Bythotrephes longimanus (Cladocera Onychopoda) was recorded between 1987 and 1993, when high values of the North Atlantic Oscillation winter index indicate warmer winter and spring temperatures across Europe. Bythotrephes remained abundant and further increased during the following 10 yr, as water temperature continued to increase. We analyzed changes in water temperature, timing of thermal stratification, and hypolimnion depth to test whether changes in the duration and thickness of a warm, low-light, deep-water refuge from fish predation can account for increases in the invertebrate predator’s abundance and seasonal duration. Using a 21-yr data set, we found that the sharpest increase in Bythotrephes abundance coincided with a shift from late August to May in its first appearance in the water column. The appearance of the planktonic population was, in turn, linked with earlier thermal stratification and earlier establishment of the predation refuge. The duration and thickness of the refuge increased as a result of earlier warming and deeper mixing, factors affected by climate rather than decreased water clarity. Daphnia hyalina galeata, the dominant grazer and a prey of Bythotrephes, decreased sharply as Bythotrephes increased. This study provides an example of how climate warming can indirectly affect the population density and phenology of a key invertebrate predator and, hence, the functioning of the pelagic food web. Text North Atlantic North Atlantic oscillation Indiana University - Purdue University Fort Wayne: Opus - Research & Creativity at IPFW |
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Indiana University - Purdue University Fort Wayne: Opus - Research & Creativity at IPFW |
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Biology |
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Biology Manca, M. DeMott, William R., Ph.D. Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation |
topic_facet |
Biology |
description |
Climate warming can affect ecological food chains directly by increasing the rates of physiological processes and indirectly by changing habitat use and altering predator–prey interactions. In Lake Maggiore, Italy, a greater than 10-fold increase in the mean annual population density of Bythotrephes longimanus (Cladocera Onychopoda) was recorded between 1987 and 1993, when high values of the North Atlantic Oscillation winter index indicate warmer winter and spring temperatures across Europe. Bythotrephes remained abundant and further increased during the following 10 yr, as water temperature continued to increase. We analyzed changes in water temperature, timing of thermal stratification, and hypolimnion depth to test whether changes in the duration and thickness of a warm, low-light, deep-water refuge from fish predation can account for increases in the invertebrate predator’s abundance and seasonal duration. Using a 21-yr data set, we found that the sharpest increase in Bythotrephes abundance coincided with a shift from late August to May in its first appearance in the water column. The appearance of the planktonic population was, in turn, linked with earlier thermal stratification and earlier establishment of the predation refuge. The duration and thickness of the refuge increased as a result of earlier warming and deeper mixing, factors affected by climate rather than decreased water clarity. Daphnia hyalina galeata, the dominant grazer and a prey of Bythotrephes, decreased sharply as Bythotrephes increased. This study provides an example of how climate warming can indirectly affect the population density and phenology of a key invertebrate predator and, hence, the functioning of the pelagic food web. |
format |
Text |
author |
Manca, M. DeMott, William R., Ph.D. |
author_facet |
Manca, M. DeMott, William R., Ph.D. |
author_sort |
Manca, M. |
title |
Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation |
title_short |
Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation |
title_full |
Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation |
title_fullStr |
Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation |
title_full_unstemmed |
Response of the Invertebrate Predator Bythotrephes to a Climate-Linked Increase in the Duration of a Refuge from Fish Predation |
title_sort |
response of the invertebrate predator bythotrephes to a climate-linked increase in the duration of a refuge from fish predation |
publisher |
Opus: Research & Creativity at IPFW |
publishDate |
2009 |
url |
http://opus.ipfw.edu/biology_facpubs/67 http://opus.ipfw.edu/cgi/viewcontent.cgi?article=1066&context=biology_facpubs |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Biology Faculty Publications |
_version_ |
1766134849224048640 |