An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross?
Summary Seabirds have been incidentally caught in distant‐water longline fleets operating in the Southern Ocean since at least the 1970s, and breeding numbers for some populations have shown marked trends of decline and recovery concomitant with longline fishing effort within their distributions. Ho...
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crwiley:10.1111/1365-2664.12462 2024-09-09T20:10:10+00:00 An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross? Tuck, Geoffrey N. Thomson, Robin B. Barbraud, Christophe Delord, Karine Louzao, Maite Herrera, Miguel Weimerskirch, Henri Votier, Steve 2015 http://dx.doi.org/10.1111/1365-2664.12462 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2664.12462 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.12462 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Applied Ecology volume 52, issue 4, page 950-959 ISSN 0021-8901 1365-2664 journal-article 2015 crwiley https://doi.org/10.1111/1365-2664.12462 2024-08-15T04:19:11Z Summary Seabirds have been incidentally caught in distant‐water longline fleets operating in the Southern Ocean since at least the 1970s, and breeding numbers for some populations have shown marked trends of decline and recovery concomitant with longline fishing effort within their distributions. However, lacking is an understanding of how forms of among‐individual heterogeneity may interact with fisheries bycatch and influence population dynamics. We develop a model that uses comprehensive data on the spatial and temporal distributions of fishing effort and seabird foraging to estimate temporal overlaps, fishery catchability and consequent bycatch. We apply a population model that is structured by age, sex, life stage and spatially to Crozet Island wandering albatross and explore how heterogeneity in susceptibility to capture may have influenced the population's demography over time. A model where some birds were assumed to be more susceptible to fisheries bycatch was able to successfully replicate the observed trend in breeding pairs. Considerably poorer fits were found without this assumption. Results suggested that the more susceptible birds may have been removed from the population by the 1990s. The model was also able to highlight areas, times and fleets prone to increased bycatch. Knowledge of these factors should assist fisheries and conservation management bodies to quantify and reduce seabird bycatch through spatial management and fleet‐specific mitigation efforts. Synthesis and application . Many seabirds show complex life histories that make them highly susceptible to additional incidental mortality from fishing vessels. By applying a population model that integrates key aspects of seabird and fishery dynamics, we were able to explain the observed trends in the breeding population of Crozet wandering albatross and identify key areas and fleets where further mitigation may be required. In addition, the potential removal of a category of birds that shows increased susceptibility to capture has ... Article in Journal/Newspaper Southern Ocean Wandering Albatross Wiley Online Library Southern Ocean Journal of Applied Ecology 52 4 950 959 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Summary Seabirds have been incidentally caught in distant‐water longline fleets operating in the Southern Ocean since at least the 1970s, and breeding numbers for some populations have shown marked trends of decline and recovery concomitant with longline fishing effort within their distributions. However, lacking is an understanding of how forms of among‐individual heterogeneity may interact with fisheries bycatch and influence population dynamics. We develop a model that uses comprehensive data on the spatial and temporal distributions of fishing effort and seabird foraging to estimate temporal overlaps, fishery catchability and consequent bycatch. We apply a population model that is structured by age, sex, life stage and spatially to Crozet Island wandering albatross and explore how heterogeneity in susceptibility to capture may have influenced the population's demography over time. A model where some birds were assumed to be more susceptible to fisheries bycatch was able to successfully replicate the observed trend in breeding pairs. Considerably poorer fits were found without this assumption. Results suggested that the more susceptible birds may have been removed from the population by the 1990s. The model was also able to highlight areas, times and fleets prone to increased bycatch. Knowledge of these factors should assist fisheries and conservation management bodies to quantify and reduce seabird bycatch through spatial management and fleet‐specific mitigation efforts. Synthesis and application . Many seabirds show complex life histories that make them highly susceptible to additional incidental mortality from fishing vessels. By applying a population model that integrates key aspects of seabird and fishery dynamics, we were able to explain the observed trends in the breeding population of Crozet wandering albatross and identify key areas and fleets where further mitigation may be required. In addition, the potential removal of a category of birds that shows increased susceptibility to capture has ... |
author2 |
Votier, Steve |
format |
Article in Journal/Newspaper |
author |
Tuck, Geoffrey N. Thomson, Robin B. Barbraud, Christophe Delord, Karine Louzao, Maite Herrera, Miguel Weimerskirch, Henri |
spellingShingle |
Tuck, Geoffrey N. Thomson, Robin B. Barbraud, Christophe Delord, Karine Louzao, Maite Herrera, Miguel Weimerskirch, Henri An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross? |
author_facet |
Tuck, Geoffrey N. Thomson, Robin B. Barbraud, Christophe Delord, Karine Louzao, Maite Herrera, Miguel Weimerskirch, Henri |
author_sort |
Tuck, Geoffrey N. |
title |
An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross? |
title_short |
An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross? |
title_full |
An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross? |
title_fullStr |
An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross? |
title_full_unstemmed |
An integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in Crozet wandering albatross? |
title_sort |
integrated assessment model of seabird population dynamics: can individual heterogeneity in susceptibility to fishing explain abundance trends in crozet wandering albatross? |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1111/1365-2664.12462 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2664.12462 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2664.12462 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean Wandering Albatross |
genre_facet |
Southern Ocean Wandering Albatross |
op_source |
Journal of Applied Ecology volume 52, issue 4, page 950-959 ISSN 0021-8901 1365-2664 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2664.12462 |
container_title |
Journal of Applied Ecology |
container_volume |
52 |
container_issue |
4 |
container_start_page |
950 |
op_container_end_page |
959 |
_version_ |
1809944563855392768 |