Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success
1. Prey aggregations, such as fish schools, attract numerous predators. This typically leads to the formation of multi-specific groups of predators. These aggregations can be seen both as a place of increased competition and as a place of possible facilitation between predators. Consequently, the fu...
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ftzenodo:oai:zenodo.org:4933869 2024-09-15T18:18:28+00:00 Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success Thiebault, Andréa Semeria, Magali Lett, Christophe Tremblay, Yann 2016-09-22 https://doi.org/10.5061/dryad.jv5f8 unknown Zenodo https://doi.org/10.1111/1365-2656.12455 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.jv5f8 oai:zenodo.org:4933869 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Delphinus capensis gannets Tursiops aduncus Carcharhinus brachyurus group-hunting Megaptera novaeangliae foraging sardine run Morus capensis Arctocephalus pusillus pusillus dolphins Holocene info:eu-repo/semantics/other 2016 ftzenodo https://doi.org/10.5061/dryad.jv5f810.1111/1365-2656.12455 2024-07-27T08:06:41Z 1. Prey aggregations, such as fish schools, attract numerous predators. This typically leads to the formation of multi-specific groups of predators. These aggregations can be seen both as a place of increased competition and as a place of possible facilitation between predators. Consequently, the functional role of such predator-prey aggregation is uncertain, and its effect on individual feeding success is virtually unknown. 2. Using underwater film footages of different predators feeding on fish schools during the sardine run in South Africa, we directly measured the in-situ feeding success of individual Cape gannets Morus capensis in different foraging situations. 3. We determined the types of Cape gannet attacks (direct plunge dive or plunge dive followed by underwater pursuit) and we measured the occurrences and timing of attacks from the different species (mostly Cape gannets and long-beaked common dolphins Delphinus capensis). We also estimated the size of the targeted fish schools. These observations were complemented with a simulation model to evaluate the cumulative effect of successive predator attacks on the prey aggregation structure. 4. The probability to capture a fish in one feeding attempt by Cape gannets averaged 0.28. It was lower when gannets engaged in underwater prey pursuit after the plunge compared to direct plunge (0.13 vs. 0.36). We found no effect of the number of prey on gannets' feeding success. However, the timing and frequency of attacks influenced strongly and positively the feeding success of individuals. The probability to capture a fish was the lowest (0.16) when no attack occurred in the few seconds (1-15 s) prior to a dive, and the highest (~0.4, i.e. more than twice) when one or two attacks occurred during this time window. The simulation model showed that a prey aggregation disorganized just after an attack, and that the maximum of disturbance was obtained a few seconds after the initiation of the successive attacks. 5. Our study suggests that, in multi-species predator ... Other/Unknown Material Megaptera novaeangliae Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Delphinus capensis gannets Tursiops aduncus Carcharhinus brachyurus group-hunting Megaptera novaeangliae foraging sardine run Morus capensis Arctocephalus pusillus pusillus dolphins Holocene |
spellingShingle |
Delphinus capensis gannets Tursiops aduncus Carcharhinus brachyurus group-hunting Megaptera novaeangliae foraging sardine run Morus capensis Arctocephalus pusillus pusillus dolphins Holocene Thiebault, Andréa Semeria, Magali Lett, Christophe Tremblay, Yann Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success |
topic_facet |
Delphinus capensis gannets Tursiops aduncus Carcharhinus brachyurus group-hunting Megaptera novaeangliae foraging sardine run Morus capensis Arctocephalus pusillus pusillus dolphins Holocene |
description |
1. Prey aggregations, such as fish schools, attract numerous predators. This typically leads to the formation of multi-specific groups of predators. These aggregations can be seen both as a place of increased competition and as a place of possible facilitation between predators. Consequently, the functional role of such predator-prey aggregation is uncertain, and its effect on individual feeding success is virtually unknown. 2. Using underwater film footages of different predators feeding on fish schools during the sardine run in South Africa, we directly measured the in-situ feeding success of individual Cape gannets Morus capensis in different foraging situations. 3. We determined the types of Cape gannet attacks (direct plunge dive or plunge dive followed by underwater pursuit) and we measured the occurrences and timing of attacks from the different species (mostly Cape gannets and long-beaked common dolphins Delphinus capensis). We also estimated the size of the targeted fish schools. These observations were complemented with a simulation model to evaluate the cumulative effect of successive predator attacks on the prey aggregation structure. 4. The probability to capture a fish in one feeding attempt by Cape gannets averaged 0.28. It was lower when gannets engaged in underwater prey pursuit after the plunge compared to direct plunge (0.13 vs. 0.36). We found no effect of the number of prey on gannets' feeding success. However, the timing and frequency of attacks influenced strongly and positively the feeding success of individuals. The probability to capture a fish was the lowest (0.16) when no attack occurred in the few seconds (1-15 s) prior to a dive, and the highest (~0.4, i.e. more than twice) when one or two attacks occurred during this time window. The simulation model showed that a prey aggregation disorganized just after an attack, and that the maximum of disturbance was obtained a few seconds after the initiation of the successive attacks. 5. Our study suggests that, in multi-species predator ... |
format |
Other/Unknown Material |
author |
Thiebault, Andréa Semeria, Magali Lett, Christophe Tremblay, Yann |
author_facet |
Thiebault, Andréa Semeria, Magali Lett, Christophe Tremblay, Yann |
author_sort |
Thiebault, Andréa |
title |
Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success |
title_short |
Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success |
title_full |
Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success |
title_fullStr |
Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success |
title_full_unstemmed |
Data from: How to capture fish in a school? Effect of successive predator attacks on seabird feeding success |
title_sort |
data from: how to capture fish in a school? effect of successive predator attacks on seabird feeding success |
publisher |
Zenodo |
publishDate |
2016 |
url |
https://doi.org/10.5061/dryad.jv5f8 |
genre |
Megaptera novaeangliae |
genre_facet |
Megaptera novaeangliae |
op_relation |
https://doi.org/10.1111/1365-2656.12455 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.jv5f8 oai:zenodo.org:4933869 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.jv5f810.1111/1365-2656.12455 |
_version_ |
1810456591210643456 |