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dc.contributor.authorØigård, Tor Arne
dc.contributor.authorHaug, Tore
dc.contributor.authorNilssen, Kjell Tormod
dc.contributor.authorSalberg, Arnt-Børre
dc.date.accessioned2011-06-23T11:44:29Z
dc.date.available2011-06-23T11:44:29Z
dc.date.issued2010-02-11
dc.identifier.issn0250-6408
dc.identifier.urihttp://hdl.handle.net/11250/108581
dc.description.abstractThe pup production of the Greenland Sea populations of hooded and harp seals were assessed in aerial surveys using two aircrafts for reconnaissance flights and photographic surveys along transects over the whelping areas from 14 March to 3 April 2007. One helicopter, operated from the applied expedition vessel, flew reconnaissance flights, monitored the distribution of seal patches and performed age-staging of the pups. The total estimate of hooded seal pup production was 16 140 (SE = 2 140, CV = 13.3%), which is similar to an estimate obtained for comparable surveys in 2005. The total pup production estimate obtained for harp seals was 110 530 (SE = 27 680, CV = 25.0%), which is slightly higher than an estimate obtained for a similar survey in 2002. The pup production and the uncertainty of the pup production estimate were estimated using a standard method for analyzing this type of survey data and a recently developed method that utilized Generalized Additive Models (GAMs). Using the two estimation methods on data from all three surveys (2002, 2005, 2007), comparable estimates of pup production were obtained. In scenarios where pups were clustered, the estimated uncertainty of the pup production estimate was much lower for the GAM method than for the conventional method. This resulted in a considerable reduction of the estimated coefficient of variation. In scenarios where pups were uniformly distributed, both methods performed the same.en_US
dc.language.isoengen_US
dc.publisherNorthwest Atlantic Fisheries Organizationen_US
dc.subjectstock assessmenten_US
dc.subjectbestandsberegningen_US
dc.subjectharp sealen_US
dc.subjectgrønlandsselen_US
dc.subjecthooded sealen_US
dc.subjectklappmyssen_US
dc.titleEstimation of Pup Production of Hooded and Harp Seals in the Greenland Sea in 2007: Reducing Uncertainty Using Generalized Additive Modelsen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921en_US
dc.source.pagenumber103–123en_US
dc.source.volume42
dc.source.journalJournal of Northwest Atlantic Fishery Science
dc.identifier.doihttp://dx.doi.org/10.2960/J.v42.m642


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