Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity
Information on animal abundance and distribution is at the cornerstone of many wildlife and conservation strategies. However, these data can be difficult and costly to obtain for cetacean species. The expense of sufficient ship time to conduct design-unbiased line transect surveys may be simply out...
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/modeling-distribution-and-abundance-of-antarctic-baleen-whales-using-ships-of-opportunity(4f9117c1-fcc6-4b0c-907c-2d357191ac7b).html https://research-repository.st-andrews.ac.uk/bitstream/10023/2857/1/WilliamsES2006ModelingDistribution.pdf http://www.scopus.com/inward/record.url?scp=33745892375&partnerID=8YFLogxK http://www.ecologyandsociety.org/vol11/iss1/art1/ |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/4f9117c1-fcc6-4b0c-907c-2d357191ac7b 2023-05-15T13:35:45+02:00 Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity Williams, Robert Hedley, Sharon L. Hammond, Philip Steven 2006-06 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/modeling-distribution-and-abundance-of-antarctic-baleen-whales-using-ships-of-opportunity(4f9117c1-fcc6-4b0c-907c-2d357191ac7b).html https://research-repository.st-andrews.ac.uk/bitstream/10023/2857/1/WilliamsES2006ModelingDistribution.pdf http://www.scopus.com/inward/record.url?scp=33745892375&partnerID=8YFLogxK http://www.ecologyandsociety.org/vol11/iss1/art1/ eng eng info:eu-repo/semantics/openAccess Williams , R , Hedley , S L & Hammond , P S 2006 , ' Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity ' , Ecology and Society , vol. 11 , no. 1 , 1 . Abundance Antarctic Baleen whale Cetacean Distance sampling Distribution Line transect Platform of opportunity Spatial model Coastal British Columbia Line transect surveys Social-organization Relative abundance Harbor porpoises South Georgia Jackknife Cetaceans Mortality Patterns article 2006 ftunstandrewcris 2021-12-26T14:16:13Z Information on animal abundance and distribution is at the cornerstone of many wildlife and conservation strategies. However, these data can be difficult and costly to obtain for cetacean species. The expense of sufficient ship time to conduct design-unbiased line transect surveys may be simply out of reach for researchers in many countries, which nonetheless grapple with problems of conservation of endangered species, by-catch of small cetaceans in commercial fisheries, and progression toward ecosystem-based fisheries management. Recently developed spatial modeling techniques show promise for estimating wildlife abundance using non-randomized surveys, but have yet to receive much field-testing in areas where designed surveys have also been conducted. Effort and sightings data were collected along 9 650 km of transects aboard ships of opportunity in the Southern Ocean during the austral summers of 2000 - 2001 and 2001 - 2002. Generalized additive models with generalized cross-validation were used to express heterogeneity of cetacean sightings as functions of spatial covariates. Models were used to map predicted densities and to estimate abundance of humpback, minke, and fin whales in the Drake Passage and along the Antarctic Peninsula. All species' distribution maps showed strong density gradients, which were robust to jackknife resampling when each of 14 trips was removed sequentially with replacement. Looped animations of model predictions of whale density illustrate uncertainty in distribution estimates in a way that is informative to non-scientists. The best abundance estimate for humpback whales was 1 829 (95% CI: 978- 3 422). Abundance of fin whales was 4 487 ( 95% CI: 1 326 - 15 179) and minke whales was 1,544 ( 95% CI: 1,221 - 1,953). These estimates agreed roughly with those reported from a designed survey conducted in the region during the previous austral summer. These estimates assumed that all animals on the trackline were detected, but preliminary results suggest that any negative bias due to ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula baleen whale baleen whales Drake Passage Southern Ocean University of St Andrews: Research Portal Antarctic Antarctic Peninsula Austral Drake Passage Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Abundance Antarctic Baleen whale Cetacean Distance sampling Distribution Line transect Platform of opportunity Spatial model Coastal British Columbia Line transect surveys Social-organization Relative abundance Harbor porpoises South Georgia Jackknife Cetaceans Mortality Patterns |
spellingShingle |
Abundance Antarctic Baleen whale Cetacean Distance sampling Distribution Line transect Platform of opportunity Spatial model Coastal British Columbia Line transect surveys Social-organization Relative abundance Harbor porpoises South Georgia Jackknife Cetaceans Mortality Patterns Williams, Robert Hedley, Sharon L. Hammond, Philip Steven Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity |
topic_facet |
Abundance Antarctic Baleen whale Cetacean Distance sampling Distribution Line transect Platform of opportunity Spatial model Coastal British Columbia Line transect surveys Social-organization Relative abundance Harbor porpoises South Georgia Jackknife Cetaceans Mortality Patterns |
description |
Information on animal abundance and distribution is at the cornerstone of many wildlife and conservation strategies. However, these data can be difficult and costly to obtain for cetacean species. The expense of sufficient ship time to conduct design-unbiased line transect surveys may be simply out of reach for researchers in many countries, which nonetheless grapple with problems of conservation of endangered species, by-catch of small cetaceans in commercial fisheries, and progression toward ecosystem-based fisheries management. Recently developed spatial modeling techniques show promise for estimating wildlife abundance using non-randomized surveys, but have yet to receive much field-testing in areas where designed surveys have also been conducted. Effort and sightings data were collected along 9 650 km of transects aboard ships of opportunity in the Southern Ocean during the austral summers of 2000 - 2001 and 2001 - 2002. Generalized additive models with generalized cross-validation were used to express heterogeneity of cetacean sightings as functions of spatial covariates. Models were used to map predicted densities and to estimate abundance of humpback, minke, and fin whales in the Drake Passage and along the Antarctic Peninsula. All species' distribution maps showed strong density gradients, which were robust to jackknife resampling when each of 14 trips was removed sequentially with replacement. Looped animations of model predictions of whale density illustrate uncertainty in distribution estimates in a way that is informative to non-scientists. The best abundance estimate for humpback whales was 1 829 (95% CI: 978- 3 422). Abundance of fin whales was 4 487 ( 95% CI: 1 326 - 15 179) and minke whales was 1,544 ( 95% CI: 1,221 - 1,953). These estimates agreed roughly with those reported from a designed survey conducted in the region during the previous austral summer. These estimates assumed that all animals on the trackline were detected, but preliminary results suggest that any negative bias due to ... |
format |
Article in Journal/Newspaper |
author |
Williams, Robert Hedley, Sharon L. Hammond, Philip Steven |
author_facet |
Williams, Robert Hedley, Sharon L. Hammond, Philip Steven |
author_sort |
Williams, Robert |
title |
Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity |
title_short |
Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity |
title_full |
Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity |
title_fullStr |
Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity |
title_full_unstemmed |
Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity |
title_sort |
modeling distribution and abundance of antarctic baleen whales using ships of opportunity |
publishDate |
2006 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/modeling-distribution-and-abundance-of-antarctic-baleen-whales-using-ships-of-opportunity(4f9117c1-fcc6-4b0c-907c-2d357191ac7b).html https://research-repository.st-andrews.ac.uk/bitstream/10023/2857/1/WilliamsES2006ModelingDistribution.pdf http://www.scopus.com/inward/record.url?scp=33745892375&partnerID=8YFLogxK http://www.ecologyandsociety.org/vol11/iss1/art1/ |
geographic |
Antarctic Antarctic Peninsula Austral Drake Passage Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Austral Drake Passage Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula baleen whale baleen whales Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula baleen whale baleen whales Drake Passage Southern Ocean |
op_source |
Williams , R , Hedley , S L & Hammond , P S 2006 , ' Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity ' , Ecology and Society , vol. 11 , no. 1 , 1 . |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766069930466213888 |