Search results
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric parameter?
the sex of individuals, it is only able to correctly sex a certain proportion of birds. Two overlapping ... for a sex, and the apparent mean derived by sexing the birds using discriminant analysis. When discriminant ... functions are able to correctly determine the sex of birds with greater than 80% success the difference ... between the true and apparent mean is likely to be undetectable when fewer than 600 birds are sampled ...
Meeting Document : WG-CEMP-92/11 : Author(s): D.J. Agnew (Secretariat)
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CCAMLR ecosystem monitoring program standard methods: determination of sex of Adelie penguins
when more than 90% of the incubating birds were male and a 6- or 7-day period when more than 90 ... % of the birds were female. The dates of these peak periods of male or female presence overlapped by only ... and peak presence of females after 33–36 days from this date. In all three seasons male birds could ... or capturing the birds. Author(s): K.R. Kerry, J.R. Clarke and G.D. Else (Australia) Title: CCAMLR ecosystem ...
Meeting Document : WG-CEMP-94/08 : Author(s): K.R. Kerry, J.R. Clarke and G.D. Else (Australia)
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BIRDLIFE INTERNATIONAL GLOBAL PROCELLARIFORME TRACKING DATABASE – 2008 UPDATE
Abstract: Three GLS datasets were added to the BirdLife Global Procellariform Tracking Database ... in 2008. Author(s): B. Sullivan (BirdLife International) Title: BIRDLIFE INTERNATIONAL GLOBAL ... Three GLS datasets were added to the BirdLife Global ... B. Sullivan (BirdLife International) ...
Meeting Document : WG-IMAF-09/13 : Author(s): B. Sullivan (BirdLife International)
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Seabird mortality in the Patagonian toothfish longline fishery around the Prince Edward Islands, 1996–2000
(particularly grey-headed albatrosses Thalassarche chrysocome) were also killed. Birds were caught almost ... exclusively during their breeding seasons and most birds killed were breeding adult males from the Prince ... revenue by allowing these birds to access baited hooks. Rates of seabird bycatch in the sanctioned fishery ... decreased from 0.19 birds/1000 hooks to 0.034 birds/1000 hooks during the time of this study ...
Meeting Document : WG-FSA-01/8 : Author(s): D.C. Nel, P.G. Ryan and B.P. Watkins (South Africa)
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Seabird mortality and the Falkland Islands trawling fleet
on the Patagonian Shelf, north of the Islands. Birds were killed after being dragged underwater by the warp cable ... , while feeding on factory discharge at the stern of the vessel. An unknown proportion of these birds ... surface, and are subsequently hauled onboard. In over 600 observed hauls in 2001-03 no birds were observed ... Shelf, north of the Islands. Birds were killed after being dragged underwater by the warp cable, while ...
Meeting Document : WG-FSA-03/91 : Author(s): B.J. Sullivan, T.A. Reid, L. Bugoni and A.D. Black (United Kingdom)
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Seabird by-catch in the Patagonian toothfish longline fishery at the Prince Edward Islands: 2001–2002
birds: two White-chinned Petrels Procellaria aequinoctialis and one Grey Petrel P. cinerea. Average ... seabird bycatch rate by sanctioned vessels was 0.001 birds per 1 000 hooks which is a significant drop ... from the previous season when 0.009 birds were killed per 1000 hooks. Author(s): B.P. Watkins (South ... /2001 (Ryan & Watkins 2001). The number of seabirds reported killed by the observers was three birds ...
Meeting Document : WG-FSA-02/17 : Author(s): B.P. Watkins (South Africa)
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A generalized discriminant for sexing fulmarine petrels from external measurements
birds to predict the sex of unknown individuals in field studies. Geographic variation in size and shape ... , Daption capense; and Snow Petrel, Pagodroma nivea) assigned 81 to 98% of birds in the samples ... discriminant scores, without reference to sexed birds, by using a maximum-likelihood method. Depending ... populations of fulmarine petrels without requiring samples of birds of known sex. Author(s): J.A. van ...
Meeting Document : WG-CEMP-94/24 : Author(s): J.A. van Franeker and C.J.F. ter Braak (The Netherlands)
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Seabird interaction with long-lining operations for Dissostichus eleginoides around South Georgia, April and May 1994
for the twenty sets was 0.48 birds/1000 hooks and maximum mortality 3.12 birds/1000 hooks. Mortality ... and interactions of birds with operations varied with site and time of day, and due to behavioural interactions ... between birds. Setting only at night would dramatically reduce albatross deaths, but would substantially ... for the twenty sets was 0.48 birds/1000 hooks and maximum mortality 3.12 birds/1000 hooks. Mortality ...
Meeting Document : WG-IMALF-94/15 : Author(s): J.R. Ashford, J.P. Croxall (United Kingdom), P.S. Rubilar and C.A. Moreno (Chile)
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The incidence of plastic in the diets of Antarctic seabirds
below the sea surface contained little plastic, as expected; these birds live entirely on live prey ... and micronekton. This includes the majority of Southern Ocean flighted birds. Incidence of plastic among them ... the sea surface contained little plastic, as expected; these birds live entirely on live prey. Among ... . This includes the majority of Southern Ocean flighted birds. Incidence of plastic among them was a function ...
Meeting Document : SC-CAMLR-X/BG/18 : Author(s): Delegation of USA
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Diving pattern and performance in nonbreeding gentoo penguins (Pygoscelis papua) during winter
, and compared foraging behavior with that of breeding (chick-rearing) birds. Foraging was highly diurnal with 98 ... was 6-8 h, and birds spent 51-62% of the foraging trip diving. Dive depth and duration were bimodal. Shallow dives (30 ... and diel movements of Antarctic krill, the main winter prey of Gentoo Penguins (including study birds). We ... activity of non breeding Gentoo Penguins in winter is similar to that of chick-rearing birds. The only ...
Meeting Document : WG-CEMP-92/37 : Author(s): T.D. Williams (United Kingdom), A. Kato (Japan), J.P. Croxall (United Kingdom), Y. Naito (Japan), D.R. Briggs, S. Rodwell and T.R. Barton (United Kingdom)