Temperature effects on fish production across a natural thermal gradient
Global warming is widely predicted to reduce the biomass production of top predators, or even result in species loss. Several exceptions to this expectation have been identified, however, and it is vital that we understand the underlying mechanisms if we are to improve our ability to predict future...
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Online Access: | http://prodinra.inra.fr/ft/737AC412-1B01-463C-9A1B-3CB2DC1239A3 http://prodinra.inra.fr/record/388913 https://doi.org/10.1111/gcb.13233 |
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ftinraparis:oai:prodinra.inra.fr:388913 2023-05-15T15:13:45+02:00 Temperature effects on fish production across a natural thermal gradient Demars, Benoit O. L. Friberg, Nikolai Gudbergsson, Gudni Hannesdottir, Elisabet R. Jackson, Michelle C. Johansson, Liselotte S. Mc Laughlin, Orla Olafsson, Jon S. Woodward, Guy Gislason, Gisli M. O'Gorman, Eoin J. Olafsson, Olafur P. 2016 application/pdf http://prodinra.inra.fr/ft/737AC412-1B01-463C-9A1B-3CB2DC1239A3 http://prodinra.inra.fr/record/388913 https://doi.org/10.1111/gcb.13233 eng eng http://creativecommons.org/licenses/by-nd-nc/1.0/ CC-BY-ND-NC Global Change Biology 9 (22), 3206-3220. (2016) natural experiment;Arctic;Hengill;freshwater;Salmo trutta fario;PIT tag;mark-recapture;ecosystem services ARTICLE 2016 ftinraparis https://doi.org/10.1111/gcb.13233 2017-03-28T22:23:48Z Global warming is widely predicted to reduce the biomass production of top predators, or even result in species loss. Several exceptions to this expectation have been identified, however, and it is vital that we understand the underlying mechanisms if we are to improve our ability to predict future trends. Here, we used a natural warming experiment in Iceland and quantitative theoretical predictions to investigate the success of brown trout as top predators across a stream temperature gradient (4-25 degrees C). Brown trout are at the northern limit of their geographic distribution in this system, with ambient stream temperatures below their optimum for maximal growth, and above it in the warmest streams. A five-month mark-recapture study revealed that population abundance, biomass, growth rate, and production of trout all increased with stream temperature. We identified two mechanisms that contributed to these responses: (1) trout became more selective in their diet as stream temperature increased, feeding higher in the food web and increasing in trophic position; and (2) trophic transfer through the food web was more efficient in the warmer streams. We found little evidence to support a third potential mechanism: that external subsidies would play a more important role in the diet of trout with increasing stream temperature. Resource availability was also amplified through the trophic levels with warming, as predicted by metabolic theory in nutrient-replete systems. These results highlight circumstances in which top predators can thrive in warmer environments and contribute to our knowledge of warming impacts on natural communities and ecosystem functioning. Article in Journal/Newspaper Arctic Global warming Iceland Institut National de la Recherche Agronomique: ProdINRA Arctic Hengill ENVELOPE(-21.306,-21.306,64.078,64.078) Global Change Biology 22 9 3206 3220 |
institution |
Open Polar |
collection |
Institut National de la Recherche Agronomique: ProdINRA |
op_collection_id |
ftinraparis |
language |
English |
topic |
natural experiment;Arctic;Hengill;freshwater;Salmo trutta fario;PIT tag;mark-recapture;ecosystem services |
spellingShingle |
natural experiment;Arctic;Hengill;freshwater;Salmo trutta fario;PIT tag;mark-recapture;ecosystem services Demars, Benoit O. L. Friberg, Nikolai Gudbergsson, Gudni Hannesdottir, Elisabet R. Jackson, Michelle C. Johansson, Liselotte S. Mc Laughlin, Orla Olafsson, Jon S. Woodward, Guy Gislason, Gisli M. Temperature effects on fish production across a natural thermal gradient |
topic_facet |
natural experiment;Arctic;Hengill;freshwater;Salmo trutta fario;PIT tag;mark-recapture;ecosystem services |
description |
Global warming is widely predicted to reduce the biomass production of top predators, or even result in species loss. Several exceptions to this expectation have been identified, however, and it is vital that we understand the underlying mechanisms if we are to improve our ability to predict future trends. Here, we used a natural warming experiment in Iceland and quantitative theoretical predictions to investigate the success of brown trout as top predators across a stream temperature gradient (4-25 degrees C). Brown trout are at the northern limit of their geographic distribution in this system, with ambient stream temperatures below their optimum for maximal growth, and above it in the warmest streams. A five-month mark-recapture study revealed that population abundance, biomass, growth rate, and production of trout all increased with stream temperature. We identified two mechanisms that contributed to these responses: (1) trout became more selective in their diet as stream temperature increased, feeding higher in the food web and increasing in trophic position; and (2) trophic transfer through the food web was more efficient in the warmer streams. We found little evidence to support a third potential mechanism: that external subsidies would play a more important role in the diet of trout with increasing stream temperature. Resource availability was also amplified through the trophic levels with warming, as predicted by metabolic theory in nutrient-replete systems. These results highlight circumstances in which top predators can thrive in warmer environments and contribute to our knowledge of warming impacts on natural communities and ecosystem functioning. |
author2 |
O'Gorman, Eoin J. Olafsson, Olafur P. |
format |
Article in Journal/Newspaper |
author |
Demars, Benoit O. L. Friberg, Nikolai Gudbergsson, Gudni Hannesdottir, Elisabet R. Jackson, Michelle C. Johansson, Liselotte S. Mc Laughlin, Orla Olafsson, Jon S. Woodward, Guy Gislason, Gisli M. |
author_facet |
Demars, Benoit O. L. Friberg, Nikolai Gudbergsson, Gudni Hannesdottir, Elisabet R. Jackson, Michelle C. Johansson, Liselotte S. Mc Laughlin, Orla Olafsson, Jon S. Woodward, Guy Gislason, Gisli M. |
author_sort |
Demars, Benoit O. L. |
title |
Temperature effects on fish production across a natural thermal gradient |
title_short |
Temperature effects on fish production across a natural thermal gradient |
title_full |
Temperature effects on fish production across a natural thermal gradient |
title_fullStr |
Temperature effects on fish production across a natural thermal gradient |
title_full_unstemmed |
Temperature effects on fish production across a natural thermal gradient |
title_sort |
temperature effects on fish production across a natural thermal gradient |
publishDate |
2016 |
url |
http://prodinra.inra.fr/ft/737AC412-1B01-463C-9A1B-3CB2DC1239A3 http://prodinra.inra.fr/record/388913 https://doi.org/10.1111/gcb.13233 |
long_lat |
ENVELOPE(-21.306,-21.306,64.078,64.078) |
geographic |
Arctic Hengill |
geographic_facet |
Arctic Hengill |
genre |
Arctic Global warming Iceland |
genre_facet |
Arctic Global warming Iceland |
op_source |
Global Change Biology 9 (22), 3206-3220. (2016) |
op_rights |
http://creativecommons.org/licenses/by-nd-nc/1.0/ |
op_rightsnorm |
CC-BY-ND-NC |
op_doi |
https://doi.org/10.1111/gcb.13233 |
container_title |
Global Change Biology |
container_volume |
22 |
container_issue |
9 |
container_start_page |
3206 |
op_container_end_page |
3220 |
_version_ |
1766344274149900288 |