A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations
Incidental mortality (bycatch) in fisheries remains the greatest threat to many large marine vertebrates and is a major barrier to fisheries sustainability. Robust assessments of bycatch risk are crucial for informing effective mitigation strategies, but are hampered by missing information on the di...
Published in: | Journal of Applied Ecology |
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Online Access: | http://livrepository.liverpool.ac.uk/3043517/ https://doi.org/10.1111/1365-2664.13407 http://livrepository.liverpool.ac.uk/3043517/1/Clay_et_al-2019-Journal_of_Applied_Ecology.pdf |
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:3043517 2023-05-15T13:51:53+02:00 A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations Clay, Thomas A Small, Cleo Tuck, Geoffrey N Pardo, Deborah Carneiro, Ana PB Wood, Andrew G Croxall, John P Crossin, Glenn T Phillips, Richard A Paiva, Vitor 2019 text http://livrepository.liverpool.ac.uk/3043517/ https://doi.org/10.1111/1365-2664.13407 http://livrepository.liverpool.ac.uk/3043517/1/Clay_et_al-2019-Journal_of_Applied_Ecology.pdf en eng Wiley http://livrepository.liverpool.ac.uk/3043517/1/Clay_et_al-2019-Journal_of_Applied_Ecology.pdf Clay, Thomas A orcid:0000-0002-0644-6105 , Small, Cleo, Tuck, Geoffrey N, Pardo, Deborah, Carneiro, Ana PB, Wood, Andrew G, Croxall, John P, Crossin, Glenn T and Phillips, Richard A (2019) A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations. JOURNAL OF APPLIED ECOLOGY, 56 (8). pp. 1882-1893. Article NonPeerReviewed 2019 ftunivliverpool https://doi.org/10.1111/1365-2664.13407 2023-01-19T23:41:57Z Incidental mortality (bycatch) in fisheries remains the greatest threat to many large marine vertebrates and is a major barrier to fisheries sustainability. Robust assessments of bycatch risk are crucial for informing effective mitigation strategies, but are hampered by missing information on the distributions of key life-history stages (adult breeders and non-breeders, immatures and juveniles). Using a comprehensive biologging dataset (1,692 tracks, 788 individuals) spanning all major life-history stages, we assessed spatial overlap of four threatened seabird populations from South Georgia, with longline and trawl fisheries in the Southern Ocean. We generated monthly population-level distributions, weighting each life-history stage according to population age structure based on demographic models. Specifically, we determined where and when birds were at greatest potential bycatch risk, and from which fleets. Overlap with both pelagic and demersal longline fisheries was highest for black-browed albatrosses, then white-chinned petrels, wandering and grey-headed albatrosses, whereas overlap with trawl fisheries was highest for white-chinned petrels. Hotspots of fisheries overlap occurred in all major ocean basins, but particularly the south-east and south-west Atlantic Ocean (longline and trawl) and south-west Indian Ocean (pelagic longline). Overlap was greatest with pelagic longline fleets in May–September, when fishing effort south of 25°S is highest, and with demersal and trawl fisheries in January–June. Overlap scores were dominated by particular fleets: pelagic longline—Japan, Taiwan; demersal longline and trawl—Argentina, Namibia, Falklands, South Africa; demersal longline—Convention for Conservation of Antarctic Marine Living Resources (CCAMLR) waters, Chile, New Zealand. Synthesis and applications. We provide a framework for calculating appropriately weighted population-level distributions from biologging data, which we recommend for future fisheries bycatch risk assessments. Many regions of high spatial ... Article in Journal/Newspaper Antarc* Antarctic Southern Ocean The University of Liverpool Repository Antarctic Argentina Indian New Zealand Southern Ocean Journal of Applied Ecology 56 8 1882 1893 |
institution |
Open Polar |
collection |
The University of Liverpool Repository |
op_collection_id |
ftunivliverpool |
language |
English |
description |
Incidental mortality (bycatch) in fisheries remains the greatest threat to many large marine vertebrates and is a major barrier to fisheries sustainability. Robust assessments of bycatch risk are crucial for informing effective mitigation strategies, but are hampered by missing information on the distributions of key life-history stages (adult breeders and non-breeders, immatures and juveniles). Using a comprehensive biologging dataset (1,692 tracks, 788 individuals) spanning all major life-history stages, we assessed spatial overlap of four threatened seabird populations from South Georgia, with longline and trawl fisheries in the Southern Ocean. We generated monthly population-level distributions, weighting each life-history stage according to population age structure based on demographic models. Specifically, we determined where and when birds were at greatest potential bycatch risk, and from which fleets. Overlap with both pelagic and demersal longline fisheries was highest for black-browed albatrosses, then white-chinned petrels, wandering and grey-headed albatrosses, whereas overlap with trawl fisheries was highest for white-chinned petrels. Hotspots of fisheries overlap occurred in all major ocean basins, but particularly the south-east and south-west Atlantic Ocean (longline and trawl) and south-west Indian Ocean (pelagic longline). Overlap was greatest with pelagic longline fleets in May–September, when fishing effort south of 25°S is highest, and with demersal and trawl fisheries in January–June. Overlap scores were dominated by particular fleets: pelagic longline—Japan, Taiwan; demersal longline and trawl—Argentina, Namibia, Falklands, South Africa; demersal longline—Convention for Conservation of Antarctic Marine Living Resources (CCAMLR) waters, Chile, New Zealand. Synthesis and applications. We provide a framework for calculating appropriately weighted population-level distributions from biologging data, which we recommend for future fisheries bycatch risk assessments. Many regions of high spatial ... |
author2 |
Paiva, Vitor |
format |
Article in Journal/Newspaper |
author |
Clay, Thomas A Small, Cleo Tuck, Geoffrey N Pardo, Deborah Carneiro, Ana PB Wood, Andrew G Croxall, John P Crossin, Glenn T Phillips, Richard A |
spellingShingle |
Clay, Thomas A Small, Cleo Tuck, Geoffrey N Pardo, Deborah Carneiro, Ana PB Wood, Andrew G Croxall, John P Crossin, Glenn T Phillips, Richard A A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations |
author_facet |
Clay, Thomas A Small, Cleo Tuck, Geoffrey N Pardo, Deborah Carneiro, Ana PB Wood, Andrew G Croxall, John P Crossin, Glenn T Phillips, Richard A |
author_sort |
Clay, Thomas A |
title |
A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations |
title_short |
A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations |
title_full |
A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations |
title_fullStr |
A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations |
title_full_unstemmed |
A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations |
title_sort |
comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations |
publisher |
Wiley |
publishDate |
2019 |
url |
http://livrepository.liverpool.ac.uk/3043517/ https://doi.org/10.1111/1365-2664.13407 http://livrepository.liverpool.ac.uk/3043517/1/Clay_et_al-2019-Journal_of_Applied_Ecology.pdf |
geographic |
Antarctic Argentina Indian New Zealand Southern Ocean |
geographic_facet |
Antarctic Argentina Indian New Zealand Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
http://livrepository.liverpool.ac.uk/3043517/1/Clay_et_al-2019-Journal_of_Applied_Ecology.pdf Clay, Thomas A orcid:0000-0002-0644-6105 , Small, Cleo, Tuck, Geoffrey N, Pardo, Deborah, Carneiro, Ana PB, Wood, Andrew G, Croxall, John P, Crossin, Glenn T and Phillips, Richard A (2019) A comprehensive large-scale assessment of fisheries bycatch risk to threatened seabird populations. JOURNAL OF APPLIED ECOLOGY, 56 (8). pp. 1882-1893. |
op_doi |
https://doi.org/10.1111/1365-2664.13407 |
container_title |
Journal of Applied Ecology |
container_volume |
56 |
container_issue |
8 |
container_start_page |
1882 |
op_container_end_page |
1893 |
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1766255931724660736 |