Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard” method
| dc.contributor.author | Branch, Trevor A | |
| dc.date.accessioned | 2016-05-16T09:40:23Z | |
| dc.date.available | 2016-05-16T09:40:23Z | |
| dc.date.issued | 2005 | |
| dc.date.updated | 2016-05-04T13:31:49Z | |
| dc.description.abstract | Simulated survey datasets provided by Palka and Smith were analysed using standard line transect methods that assume g(0)=1. Estimates of mean school size were generally positively biased by >10% when cue production was asynchronous, but otherwise typically unbiased. Overall estimates of whale density were negatively biased for nearly all scenarios considered, with mean bias of -23% for “2004” scenarios and -10% for “2005” scenarios. In the “2004” scenarios, bias was greatest when the detection function used to generate the simulated sightings included school size or weather as a covariate; in the “2005” scenarios, the greatest bias occurred when weather and whale density were correlated and when survey was in IO mode only. Implied values of g(0) ranged from 0.48 to 1.02 (mean 0.77) for the “2004” scenarios and from 0.78 to 1.03 (mean 0.90) for the “2005” scenarios, and were higher than previous estimates from the IDCR surveys (generally 0.5–0.7). | en_ZA |
| dc.identifier.apacitation | Branch, T. A. (2005). <i>Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard” method</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/19662 | en_ZA |
| dc.identifier.chicagocitation | Branch, Trevor A <i>Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard” method.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2005. http://hdl.handle.net/11427/19662 | en_ZA |
| dc.identifier.citation | Branch, T. A. (2005). Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard method”. IWC Paper SC/57/IA14: 16pp. | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Branch, Trevor A AB - Simulated survey datasets provided by Palka and Smith were analysed using standard line transect methods that assume g(0)=1. Estimates of mean school size were generally positively biased by >10% when cue production was asynchronous, but otherwise typically unbiased. Overall estimates of whale density were negatively biased for nearly all scenarios considered, with mean bias of -23% for “2004” scenarios and -10% for “2005” scenarios. In the “2004” scenarios, bias was greatest when the detection function used to generate the simulated sightings included school size or weather as a covariate; in the “2005” scenarios, the greatest bias occurred when weather and whale density were correlated and when survey was in IO mode only. Implied values of g(0) ranged from 0.48 to 1.02 (mean 0.77) for the “2004” scenarios and from 0.78 to 1.03 (mean 0.90) for the “2005” scenarios, and were higher than previous estimates from the IDCR surveys (generally 0.5–0.7). DA - 2005 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2005 T1 - Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard” method TI - Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard” method UR - http://hdl.handle.net/11427/19662 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/19662 | |
| dc.identifier.vancouvercitation | Branch TA. Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard” method. 2005 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19662 | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher.department | Marine Resource Assessment and Management Group | en_ZA |
| dc.publisher.faculty | Faculty of Science | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.subject.other | Antarctic minke whales | |
| dc.subject.other | IDCR/SOWER survey data | |
| dc.title | Estimated density of Antarctic minke whales obtained from simulated IDCR/SOWER survey data using the “standard” method | en_ZA |
| dc.type | Working Paper | en_ZA |
| uct.type.filetype | Text | |
| uct.type.filetype | Image | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Research paper | en_ZA |