The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys
Line-transect distance sampling is a widely used method for estimating animal density from aerial surveys. Analysis of line-transect distance data usually relies on a requirement that the statistical distribution of distances of animal groups from the transect line is uniform. We show that this requ...
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CSIRO Publishing
2008
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Online Access: | http://era.daf.qld.gov.au/id/eprint/1062/ |
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ftqueenslanddeaf:oai:era.daf.qld.gov.au:1062 2024-06-23T07:46:58+00:00 The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys Fewster, R.M. Southwell, C. Borchers, D.L. Buckland, S.T. Pople, Anthony R. 2008-01 application/pdf http://era.daf.qld.gov.au/id/eprint/1062/ unknown CSIRO Publishing https://era.daf.qld.gov.au/id/eprint/1062/1/WR07077.pdf http://dx.doi.org/10.1071/WR07077 http://era.daf.qld.gov.au/id/eprint/1062/ Fewster, R.M., Southwell, C., Borchers, D.L., Buckland, S.T. and Pople, A. R. (2008) The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys. Wildlife Research, 35 (4). pp. 275-288. Statistics Zoology Article PeerReviewed 2008 ftqueenslanddeaf https://doi.org/10.1071/WR07077 2024-06-07T03:07:11Z Line-transect distance sampling is a widely used method for estimating animal density from aerial surveys. Analysis of line-transect distance data usually relies on a requirement that the statistical distribution of distances of animal groups from the transect line is uniform. We show that this requirement is satisfied by the survey design if all other assumptions of distance sampling hold, but it can be violated by consistent survey problems such as responsive movement of the animals towards or away from the observer. We hypothesise that problems with the uniform requirement are unlikely to be encountered for immobile taxa, but might become substantial for species of high mobility. We test evidence for non-uniformity using double-observer distance data from two aerial surveys of five species with a spectrum of mobility capabilities and tendencies. No clear evidence against uniformity was found for crabeater seals or emperor penguins on the pack-ice in East Antarctica, while minor non-uniformity consistent with responsive movement up to 30 m was found for Adelie penguins. Strong evidence of either non-uniformity or a failure of the capture-recapture validating method was found for eastern grey kangaroos and red kangaroos in Queensland. Article in Journal/Newspaper Antarc* Antarctica Crabeater Seals East Antarctica Emperor penguins eRA (eResearch Archive - Queensland Department of Agriculture and Fisheries) East Antarctica Queensland Wildlife Research 35 4 275 |
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Open Polar |
collection |
eRA (eResearch Archive - Queensland Department of Agriculture and Fisheries) |
op_collection_id |
ftqueenslanddeaf |
language |
unknown |
topic |
Statistics Zoology |
spellingShingle |
Statistics Zoology Fewster, R.M. Southwell, C. Borchers, D.L. Buckland, S.T. Pople, Anthony R. The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys |
topic_facet |
Statistics Zoology |
description |
Line-transect distance sampling is a widely used method for estimating animal density from aerial surveys. Analysis of line-transect distance data usually relies on a requirement that the statistical distribution of distances of animal groups from the transect line is uniform. We show that this requirement is satisfied by the survey design if all other assumptions of distance sampling hold, but it can be violated by consistent survey problems such as responsive movement of the animals towards or away from the observer. We hypothesise that problems with the uniform requirement are unlikely to be encountered for immobile taxa, but might become substantial for species of high mobility. We test evidence for non-uniformity using double-observer distance data from two aerial surveys of five species with a spectrum of mobility capabilities and tendencies. No clear evidence against uniformity was found for crabeater seals or emperor penguins on the pack-ice in East Antarctica, while minor non-uniformity consistent with responsive movement up to 30 m was found for Adelie penguins. Strong evidence of either non-uniformity or a failure of the capture-recapture validating method was found for eastern grey kangaroos and red kangaroos in Queensland. |
format |
Article in Journal/Newspaper |
author |
Fewster, R.M. Southwell, C. Borchers, D.L. Buckland, S.T. Pople, Anthony R. |
author_facet |
Fewster, R.M. Southwell, C. Borchers, D.L. Buckland, S.T. Pople, Anthony R. |
author_sort |
Fewster, R.M. |
title |
The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys |
title_short |
The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys |
title_full |
The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys |
title_fullStr |
The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys |
title_full_unstemmed |
The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys |
title_sort |
influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys |
publisher |
CSIRO Publishing |
publishDate |
2008 |
url |
http://era.daf.qld.gov.au/id/eprint/1062/ |
geographic |
East Antarctica Queensland |
geographic_facet |
East Antarctica Queensland |
genre |
Antarc* Antarctica Crabeater Seals East Antarctica Emperor penguins |
genre_facet |
Antarc* Antarctica Crabeater Seals East Antarctica Emperor penguins |
op_relation |
https://era.daf.qld.gov.au/id/eprint/1062/1/WR07077.pdf http://dx.doi.org/10.1071/WR07077 http://era.daf.qld.gov.au/id/eprint/1062/ Fewster, R.M., Southwell, C., Borchers, D.L., Buckland, S.T. and Pople, A. R. (2008) The influence of animal mobility on the assumption of uniform distances in aerial line-transect surveys. Wildlife Research, 35 (4). pp. 275-288. |
op_doi |
https://doi.org/10.1071/WR07077 |
container_title |
Wildlife Research |
container_volume |
35 |
container_issue |
4 |
container_start_page |
275 |
_version_ |
1802649666933751808 |