Resultados de la búsqueda
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Foraging response of Antarctic fur seals to changes in the marine environment
Abstract: This study examined the relative contribution of environmental variation and the ... seasonal demands of pup rearing on the foraging behaviour of female Antarctic fur seals Arctocephalus ... recorders measured the diving behaviour of 72 individuals during a total of 385 foraging trips totalling ... 1964 d at sea. The frequencies of krill, fish and squid in the diet were estimated from prey items ...
Meeting Document : WG-EMM-99/35 : Autor(es): D.J. McCafferty, I.L. Boyd, T.R. Walker and R.I. Taylor (United Kingdom)
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ENTANGLEMENT OF ANTARCTIC FUR SEALS ARCTOCEPHALUS GAZELLA IN MAN-MADE DEBRIS AT BIRD ISLAND, SOUTH GEORGIA DURING THE 2007 WINTER AND 2007/08 BREEDING SEASON
Abstract: Results of the survey of entanglements of Antarctic fur seals Arctocephalus gazella at ... summer (November 2007 to March 2008) are reported here. During the reporting period of 1 April 2007 to 31 ... March 2008 a total of 36 entangled seals were observed. Sixteen and 20 entanglements were observed in ... for 25% of winter and 10% of summer entanglements. During winter, synthetic string/longline material ...
Meeting Document : WG-FSA-08/27 : Autor(es): E.W.J. Edwards (UK)
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DEVELOPMENT OF A METHODOLOGY FOR DATA QUALITY ASSESSMENT
Abstract: Measures are developed which aim to summarise the quality of fishing event, catch, and ... biological sampling data from a fishing trip. In particular these measures aim to quantify the prevalence of ... position or time reporting errors, the diversity of catch, the extent to which catch data follow Benford ... 's Law for the distribution of the first significant digit, whether length-frequency data have been ...
Meeting Document : WG-SAM-08/13 : Autor(es): D.A.J. Middleton and A. Dunn (New Zealand)
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Water mass distribution and circulation west of the Antarctic peninsula and including Bransfield Strait
Abstract: Historical hydrographic data from Bransfield Strait and the region west of the ... Antarctic Peninsula were analyzed to provide a description of water mass distributions and circulation ... patterns. Circumpolar Deep Water (CDW), which is characterized by temperatures above 1.0°C, salinities of ... this water mass floods the continental shelf west of the Antarctic Peninsula. CDW is also found in ...
Meeting Document : WG-EMM-95/67 : Autor(es): Smith, D.A., Lascara, C.M., Klinck, J.M., Hofmann, E.E.
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Spatial scales of benthic invertebrate habitats from fishery by catch and video transect data in the Ross Sea region
presence of sponge and/or gorgonian bycatch are identifiable, as are several areas of dense fishing effort ... with no evidence of sponge or gorgonian presence. Identifiable sponge and/or gorgonian habitats ... occurred at a typical scale of 10-30 km 2, though some sponge habitats appeared larger. Spatial analysis of ... these data allows the detectability of sponges and gorgonian corals to be estimated, along with changes ...
Meeting Document : WG-EMM-10/28 : Autor(es): S.J. Parker, R.G. Cole and S.M. Hanchet (New Zealand)
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A tale of two islands: contrasting fortunes for sub-Antarctic skuas at the Prince Edward Islands
Abstract: Subantarctic skuas Catharacta antarctica are key predators of burrowing petrels at sub ... -Antarctic islands, and can be used to monitor the health of burrowing petrel populations. A survey of skuas ... December 2001. Prince Edward Island (46 km 2) remains free of introduced mammals, whereas Marion Island ... (290 km 2) had a feral population of cats from the 1950s to 1980s, and still supports a large ...
Meeting Document : WG-EMM-10/P03 : Autor(es): P.G. Ryan, P.A. Whittington and R.J.M. Crawford
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Evaluating the impact of multi-year research catch limits on overfished toothfish populations
Abstract: In stocks that have been depleted by overfishing, the benefits of additional fisheries ... delaying the recovery of such stocks. Through simulating a Dissostichus eleginoides stock that has been ... subjected to varying levels of overfishing and research catches, this study show that stocks can take ... decades to recover even in the absence of fishing, and apparently low levels of research catches can ...
Meeting Document : WG-FSA-10/42 Rev. 1 : Autor(es): D.C. Welsford (Australia)
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A von Bertalanffy growth model for Division 58.5.2 fitted to length-at-age data and a comparison of predicted with observed growth from mark–recapture data
variable probability (VP) sampling of fish that were aged. Sub-sampling of random length frequency (LF ... ) data used to obtain the samples of fish for ageing used length-bin sampling involving a fixed sample ... size per bin. Estimation of the VB parameters used a definition of the maximum likelihood which took ... into account VP sampling due to length-dependent selectivity of trawl fishing and also accounted for ...
Meeting Document : WG-FSA-SAM-06/07 : Autor(es): S.G. Candy, A.J. Constable, T. Lamb and R. Williams (Australia)
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Development of an algorithm designed to assess observer data quality and performance
Abstract: As part of the Secretariat task to ensure the quality and consistency of the data ... observers in their logbooks. A first version of the algorithm was tested on four randomly selected longline ... , as well as value inconsistencies through a limited set of logical tests. For each logbook inspected ... , a text report indicating the locations of faulty entries, a set of figures to display length and ...
Meeting Document : WG-SAM-13/40 : Autor(es): Secretariat
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Collection, processing and potential use of sonar data from krill fishing vessels
vessels. The purpose of this paper is to stimulate discussion on the utility of sonars to describe krill ... Abstract: Omnidirectional sonars (herein sonars) are capable of providing an alternative view of ... Antarctic krill distribution, and potentially abundance. Data from sonars can be used independently of ... acoustic surveys. Sonars are capable of sampling large volumes of water and can image entire krill swarms ...
Meeting Document : SG-ASAM-14/01 : Autor(es): G. Skaret (Norway) and M.J. Cox (Australia)