Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics
Climate change is modifying the structure of marine ecosystems, including that of fish communities. Alterations in abiotic and biotic conditions can decrease fish size and change community spatial arrangement, ultimately impacting predator species which rely on these communities. To conserve predato...
Published in: | Journal of Animal Ecology |
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2022
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Online Access: | https://pure.au.dk/portal/da/publications/energymediated-responses-to-changing-prey-size-and-distribution-in-marine-top-predator-movements-and-population-dynamics(a03e8c16-0f26-406e-8576-d6a7a863a5f7).html https://doi.org/10.1111/1365-2656.13627 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/a03e8c16-0f26-406e-8576-d6a7a863a5f7 2023-07-30T04:04:00+02:00 Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics Gallagher, Cara Alyse Chimienti, Marianna Grimm, Volker Nabe-Nielsen, Jacob 2022-01 https://pure.au.dk/portal/da/publications/energymediated-responses-to-changing-prey-size-and-distribution-in-marine-top-predator-movements-and-population-dynamics(a03e8c16-0f26-406e-8576-d6a7a863a5f7).html https://doi.org/10.1111/1365-2656.13627 eng eng info:eu-repo/semantics/closedAccess Gallagher , C A , Chimienti , M , Grimm , V & Nabe-Nielsen , J 2022 , ' Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics ' , Journal of Animal Ecology , vol. 91 , no. 1 , pp. 241-254 . https://doi.org/10.1111/1365-2656.13627 ANIMAL MOVEMENT BODY-SIZE CLIMATE-CHANGE FOOD HARBOR PORPOISES HIDDEN MARKOV-MODELS MULTIPLE STRESSORS NORTH-SEA OCEAN PORPOISES PHOCOENA-PHOCOENA agent-based model climate change effects energy budgets harbour porpoise hidden Markov modelling marine mammal physiological ecology predictive ecology article 2022 ftuniaarhuspubl https://doi.org/10.1111/1365-2656.13627 2023-07-12T22:58:20Z Climate change is modifying the structure of marine ecosystems, including that of fish communities. Alterations in abiotic and biotic conditions can decrease fish size and change community spatial arrangement, ultimately impacting predator species which rely on these communities. To conserve predators and understand the drivers of observed changes in their population dynamics, we must advance our understanding of how shifting environmental conditions can impact populations by limiting food available to individuals. To investigate the impacts of changing fish size and spatial aggregation on a top predator population, we applied an existing agent-based model parameterized for harbour porpoises Phocoena phocoena which represents animal energetics and movements in high detail. We used this framework to quantify the impacts of shifting prey size and spatial aggregation on porpoise movement, space use, energetics and population dynamics. Simulated individuals were more likely to switch from area-restricted search to transit behaviour with increasing prey size, particularly when starving, due to elevated resource competition. In simulations with highly aggregated prey, higher prey encounter rates counteracted resource competition, resulting in no impacts of prey spatial aggregation on movement behaviour. Reduced energy intake with decreasing prey size and aggregation level caused population decline, with a 15% decrease in fish length resulting in total population collapse Increasing prey consumption rates by 42.8 ± 4.5% could offset population declines; however, this increase was 21.3 ± 12.7% higher than needed to account for changes in total energy availability alone. This suggests that animals in realistic seascapes require additional energy to locate smaller prey which should be considered when assessing the impacts of decreased energy availability. Changes in prey size and aggregation influenced movements and population dynamics of simulated harbour porpoises, revealing that climate-induced changes in prey ... Article in Journal/Newspaper Harbour porpoise Phocoena phocoena Aarhus University: Research Journal of Animal Ecology 91 1 241 254 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
ANIMAL MOVEMENT BODY-SIZE CLIMATE-CHANGE FOOD HARBOR PORPOISES HIDDEN MARKOV-MODELS MULTIPLE STRESSORS NORTH-SEA OCEAN PORPOISES PHOCOENA-PHOCOENA agent-based model climate change effects energy budgets harbour porpoise hidden Markov modelling marine mammal physiological ecology predictive ecology |
spellingShingle |
ANIMAL MOVEMENT BODY-SIZE CLIMATE-CHANGE FOOD HARBOR PORPOISES HIDDEN MARKOV-MODELS MULTIPLE STRESSORS NORTH-SEA OCEAN PORPOISES PHOCOENA-PHOCOENA agent-based model climate change effects energy budgets harbour porpoise hidden Markov modelling marine mammal physiological ecology predictive ecology Gallagher, Cara Alyse Chimienti, Marianna Grimm, Volker Nabe-Nielsen, Jacob Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics |
topic_facet |
ANIMAL MOVEMENT BODY-SIZE CLIMATE-CHANGE FOOD HARBOR PORPOISES HIDDEN MARKOV-MODELS MULTIPLE STRESSORS NORTH-SEA OCEAN PORPOISES PHOCOENA-PHOCOENA agent-based model climate change effects energy budgets harbour porpoise hidden Markov modelling marine mammal physiological ecology predictive ecology |
description |
Climate change is modifying the structure of marine ecosystems, including that of fish communities. Alterations in abiotic and biotic conditions can decrease fish size and change community spatial arrangement, ultimately impacting predator species which rely on these communities. To conserve predators and understand the drivers of observed changes in their population dynamics, we must advance our understanding of how shifting environmental conditions can impact populations by limiting food available to individuals. To investigate the impacts of changing fish size and spatial aggregation on a top predator population, we applied an existing agent-based model parameterized for harbour porpoises Phocoena phocoena which represents animal energetics and movements in high detail. We used this framework to quantify the impacts of shifting prey size and spatial aggregation on porpoise movement, space use, energetics and population dynamics. Simulated individuals were more likely to switch from area-restricted search to transit behaviour with increasing prey size, particularly when starving, due to elevated resource competition. In simulations with highly aggregated prey, higher prey encounter rates counteracted resource competition, resulting in no impacts of prey spatial aggregation on movement behaviour. Reduced energy intake with decreasing prey size and aggregation level caused population decline, with a 15% decrease in fish length resulting in total population collapse Increasing prey consumption rates by 42.8 ± 4.5% could offset population declines; however, this increase was 21.3 ± 12.7% higher than needed to account for changes in total energy availability alone. This suggests that animals in realistic seascapes require additional energy to locate smaller prey which should be considered when assessing the impacts of decreased energy availability. Changes in prey size and aggregation influenced movements and population dynamics of simulated harbour porpoises, revealing that climate-induced changes in prey ... |
format |
Article in Journal/Newspaper |
author |
Gallagher, Cara Alyse Chimienti, Marianna Grimm, Volker Nabe-Nielsen, Jacob |
author_facet |
Gallagher, Cara Alyse Chimienti, Marianna Grimm, Volker Nabe-Nielsen, Jacob |
author_sort |
Gallagher, Cara Alyse |
title |
Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics |
title_short |
Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics |
title_full |
Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics |
title_fullStr |
Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics |
title_full_unstemmed |
Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics |
title_sort |
energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics |
publishDate |
2022 |
url |
https://pure.au.dk/portal/da/publications/energymediated-responses-to-changing-prey-size-and-distribution-in-marine-top-predator-movements-and-population-dynamics(a03e8c16-0f26-406e-8576-d6a7a863a5f7).html https://doi.org/10.1111/1365-2656.13627 |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_source |
Gallagher , C A , Chimienti , M , Grimm , V & Nabe-Nielsen , J 2022 , ' Energy‐mediated responses to changing prey size and distribution in marine top predator movements and population dynamics ' , Journal of Animal Ecology , vol. 91 , no. 1 , pp. 241-254 . https://doi.org/10.1111/1365-2656.13627 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1111/1365-2656.13627 |
container_title |
Journal of Animal Ecology |
container_volume |
91 |
container_issue |
1 |
container_start_page |
241 |
op_container_end_page |
254 |
_version_ |
1772815159577804800 |