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Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000
. Krill densities had previously been determined at approximately 0.5 km intervals along each of the ten ... Paper Title: Maximum entropy reconstructions of krill distribution and estimates of krill density ... from acoustic surveys at South Georgia, 1996–2000 Abstract / Description: This paper presents Maximum ... Entropy (MaxEnt) reconstructions of krill distribution and estimates of mean krill density within two ... been determined at approximately 0.5 km intervals along each of the ten 80 km transects in each box ... effective the MaxEnt approach was at inferring individual cell densities in the absence of observed data ... , 52 data points were removed at random from the raw data prior to one analysis of one cruise (JR38W ... ). After reconstruc- tion in the absence of these data, the MaxEnt- generated points at these positions ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Autor(es): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins
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Investigation of bias in the mark–recapture estimate of toothfish population size at South Georgia
Paper Title: Investigation of bias in the mark–recapture estimate of toothfish population size at ... releases and recapture effort at South Georgia is likely to lead to an underestimate of the true population ... South Georgia Abstract / Description: This paper investigates the influence of mixing of fish, and the ... uneven distribution of tag placements and recapture effort, on bias in the Petersen estimator of ... InvestIgatIon of bIas In the mark–recapture estImate of toothfIsh populatIon sIze at south georgIa D.J. Agnew ... Subarea 48.3, it is concluded that the particular distribution of tag releases and recapture effort at ... rates of tagged toothfish at South Georgia are almost certainly relatively low because, in common with ... depending on the trend of the 1 000 m contour at that position around South Georgia or Shag Rocks. The ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 47–63 : Autor(es): Agnew, D.J., G.P. Kirkwood, J. Pearce and J. Clark
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Analysis of the diet of Champsocephalus gunnari at South Georgia in late summer from 1994 to 1997, Dr Eduardo L. Holmberg surveys
Paper Title: Analysis of the diet of Champsocephalus gunnari at South Georgia in late summer from ... 1994 to 1997, Dr Eduardo L. Holmberg surveys Abstract / Description: The diet composition of the ... was analysed using frequency of occurrence (F%) and dietary coefficient (Q%) methods. Krill (Euphausia ... Georgia and Shag Rocks in the period investigated, except in 1994, when the order of importance of these ... DIET OF CHMPSOCEPHALUS GUNNARZ AT SOUTH GEORGIA IN LATE SUMMER FROM 1994 TO 1997, DR E D U R D O L ... of the 1980s and at lower The mackerel icefish (Charnpsocephalus gunnaui) levels up t o t he ... ., 1988; Kock et al., 1994a). Together with other Diet of C. gunnari at South Georgia Table 1 ... a sample size of 25 ensures CVs of at least 10%. We established a maximum n of 50, which yields ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 103–123 : Autor(es): Barrera-Oro, E., R. Casaux and E. Marschoff
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RECENT TRENDS IN NUMBERS OF FOUR SPECIES OF PENGUINS AT THE PRINCE EDWARD ISLANDS
Abstract: Four species of penguin breed regularly at South Africa’s Prince Edward Islands: king ... pairs of king penguins were incubating eggs at Marion Island, the larger of the two islands in the group ... penguin chicks survived the winter period (from April to September/October). Numbers of gentoo penguins at ... numbers of macaroni and southern rockhopper penguins at Marion Island decreased by about 30% and 70 ...
Meeting Document : WG-EMM-10/P1 : Autor(es): R.J.M. Crawford, P.A. Whittington, L. Upfold, P.G. Ryan, S.L. Petersen, B.M. Dyer and J. Cooper
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Recent trends in numbers of four species of penguins at the Prince Edward Islands
Abstract: Four species of penguin breed regularly at South Africa’s Prince Edward Islands: king ... pairs of king penguins were incubating eggs at Marion Island, the larger of the two islands in the group ... penguin chicks survived the winter period (from April to September/October). Numbers of gentoo penguins at ... numbers of macaroni and southern rockhopper penguins at Marion Island decreased by about 30% and 70 ...
Meeting Document : WG-EMM-10/P01 : Autor(es): R.J.M. Crawford, P.A. Whittington, L. Upfold, P.G. Ryan, S.L. Petersen, B.M. Dyer and J. Cooper
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Measurements of differences in the target strength of Antarctic krill (Euphausia superba) swarms at 38 and 120 kHz
Abstract: Differences in the target strength of adult Antarctic krill (Euphausia Superba) at 38 ... experimental work on the target strength of encaged E. Superba at 38 and 120 kHz but are in major conflict with ... of Antarctic krill (Euphausia superba) swarms at 38 and 120 kHz Approval: Approved ... and 120 kHz have been inferred from differences in the mean back-scattering strength of swarms ...
Meeting Document : WG-KRILL-90/28 : Autor(es): I. Hampton (South Africa)
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ESTIMATES OF NUMBERS OF KELP GULLS AND KERGUELEN AND ANTARCTIC TERNS BREEDING AT THE PRINCE EDWARD ISLANDS, 1996/97–2008/09
Abstract: Breeding numbers of Laridae and other surface-nesting seabirds have been monitored at ... subantarctic Marion Island since 1996/97 and counts of breeding birds were made at nearby Prince Edward Island ... the 1980s. Kerguelen tern numbers decreased and then recovered at Marion Island but numbers of the ... P.G. Ryan Title: ESTIMATES OF NUMBERS OF KELP GULLS AND KERGUELEN AND ANTARCTIC TERNS BREEDING AT THE ...
Meeting Document : WG-EMM-10/P5 : Autor(es): P.A. Whittington, R.J.M. Crawford, B.M. Dyer and P.G. Ryan
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Estimates of numbers of kelp gulls and Kerguelen and Antarctic terns breeding at the Prince Edward Islands, 1996/97–2008/09
Abstract: Breeding numbers of Laridae and other surface-nesting seabirds have been monitored at ... subantarctic Marion Island since 1996/97 and counts of breeding birds were made at nearby Prince Edward Island ... the 1980s. Kerguelen tern numbers decreased and then recovered at Marion Island but numbers of the ... in December 2001 and December 2008. Four species are regular breeders at the islands: subantarctic ...
Meeting Document : WG-EMM-10/P05 : Autor(es): P.A. Whittington, R.J.M. Crawford, B.M. Dyer and P.G. Ryan
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Summary of holdings of Patagonian toothfish (Dissostichus eleginoides) otoliths and size-at-age estimates from Heard and McDonald Islands (Division 58.5.2)
has yielded data which has assisted with understanding age structure and growth rates of toothfish in ... this Division. This paper summarises the otolith collection housed at the Australian Antarctic Division ... individuals which have been processed by the Central Ageing Facility to provide size-at-age estimates. Over ... collected from recaptured tagged fish. More than 3200 otoliths have been processed to provide size-at-age ...
Meeting Document : WG-FSA-07/45 : Autor(es): D.C. Welsford and G.B. Nowara (Australia)
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Revision of the commercial catch at age of the Antarctic icefish Champsocephalus gunnari over the period 1976/77 to 1990/91
Abstract: A revision of the calculation of total international catch at age of Champsocephalus ... proposed that the revised catch at age be used for future assessment of the C. gunnari fishery at South ... Georgia using VPA. Author(s): G.B. Parkes (United Kingdom) Title: Revision of the commercial catch at ... gunnari over the period 1976/77 to 1990/91 is presented. This uses iterative application of two age length ...
Meeting Document : WG-FSA-93/29 : Autor(es): G.B. Parkes (United Kingdom)