Résultats de la recherche
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COLLAPSE OF SOUTH AFRICA’S PENGUINS IN THE EARLY 21ST CENTURY
anchovy. In this province, there was a south-east displacement of prey around 2000, which led to a ... from about 56 000 pairs in 2001 to some 21 000 pairs in 2009, a loss of 35 000 pairs (>60%) in eight ... Abstract: The number of African penguins Spheniscus demersus breeding in South Africa collapsed ... classification of the species as Endangered. In South Africa, penguins breed in two regions, the Western Capeand ...
Meeting Document : WG-EMM-11/P8 : Auteur(s): R.J.M. Crawford, R. Altwegg, B.J. Barham, P.J. Barham, J.M. Durant, B.M. Dyer, D. Geldenhuys, A.B. Makhado, L. Pichegru, P.G. Ryan, L.G. Underhill, L. Upfold, J. Visagie, L.J. Waller and P.A. Whittington
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The foraging range of Adélie penguins at Béchervaise Island, Mac. Robertson Land, Antarctica, and its overlap with the krill fishery
Paper Title: The foraging range of Adélie penguins at Béchervaise Island, Mac. Robertson Land ... , Antarctica, and its overlap with the krill fishery Abstract / Description: The foraging ranges of six female ... point. Birds feeding chicks also made journeys of one to two days ranging up to 12 km after 17 January ... when the sea became ice free to the coast. Concentrations of krill, Euphausia superba, which have in ... Table 1: Details of each foraging trip by Ad€lie penguins as determined by satellite tracking. The ... 67.0° long foraging trip after travelled north of continental shelf flrst incubation shift before PIT ... the bird using a VelcroTM patch and cable ties which were glued to the middle of the bird's back; the ... WG-CEMP-92/36 THE FORAGING RANGE OF ADELIE PENGUINS AT ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 337–344 : Auteur(s): Kerry, K.R., J.R. Clarke and G.D. Else
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Sensitivity analysis for parameters of predatory species CCAMLR Ecosystem Monitoring Program
Paper Title: Sensitivity analysis for parameters of predatory species CCAMLR Ecosystem Monitoring ... Program Abstract / Description: Following the request of the Scientific Committee of CCAMLR to conduct ... such a treatment of data obtained at the Magnetic Island Adélie penguin colony in Prydz Bay in the 1987 ... arrival at breeding colonies; duration of first incubation shift; duration of adult foraging trips ... the foraging trip of the incubating bird's partner. The CEMP Standard Methods Sheets (CCAMLR, 1988 ... female of 26 pairs, and male only at an additional 31 nests, at the Turner colony. At the East colony ... considered sensitive to the availability of food during the foraging trip. The CCAMLR Standard Methods ... sites were visited daily and the attendance of either adult of the pair recorded. Foraging trip length ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 411–432 : Auteur(s): Whitehead, M.D.
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Biological characteristics of Antarctic fish stocks in the southern Scotia Arc region
Paper Title: Biological characteristics of Antarctic fish stocks in the southern Scotia Arc ... region Abstract / Description: Commercial exploitation of finfish in the southern Scotia Arc took place ... state of fish stocks of the southern Scotia Arc region has been accorded little attention until 1998 ... , despite substantial catches in the first four years of the fishery and ample opportunity to sample these ... are located some 150 n miles to the east of Elephant Island. The shelf areas of both island groups ... the second half of the 1960s, principally by fleets from the ex-Soviet Union and other former ... trawl surveys since the mid- 1960s. The fish fauna was well known in terms of its composition and a ... CHARACTERISTICS OF ANTARCTIC FISH STOCKS IN THE SOUTHERN SCOTIA ARC REGION K.-H. Kock Institut fur ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 1–41 : Auteur(s): Kock, K.-H., C.D. Jones and S. Wilhelms
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Consideration of major issues in ecosystem monitoring and management
Paper Title: Consideration of major issues in ecosystem monitoring and management Abstract ... / Description: This paper outlines the requirements of an ecosystem approach to the management of Southern ... availability of krill, variation in vital rates of the dependent species and the overlap between commercial ... means of CEMP. The overlap between fishing and predator foraging is being monitored. A mechanism for ... of krill. At the one extreme, foraging trip duration refl ects the local availability of krill ... the trip, the lower the availability of krill. These indices are likely to have very short response ... life span of the bird is short, then the loss of a single year class will have a major effect ... . 9 (2002): 213–232 213 CONSIDERATION OF MAJOR ISSUES IN ECOSYSTEM MONITORING AND MANAGEMENT I ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 213–232 : Auteur(s): Everson, I
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Statistical power to detect changes in growth rates of Antarctic fur seal pups
changes (between years) in pup growth rates, the loss of power associated with obtaining weight samples on ... Paper Title: Statistical power to detect changes in growth rates of Antarctic fur seal pups ... Abstract / Description: Numerical simulations were used to investigate the power of methods for detecting ... only three dates in a season, and potential means of increasing the power of the CCAMLR Ecosystem ... ) in pup growth rates, the loss of power associated with obtaining weight samples on only three dates ... loss of power associated with obtaining only three weight samples, and possible means of increasing ... IN GROWTH RATES OF ANTARCTIC FUR SEAL PUPS P. Boveng, J. L. Bengtson and M. E. Goebel Abstract ... Numerical simulations were used to investigate the power of methods for detecting changes (between years ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 399–409 : Auteur(s): Boveng, P., J.L. Bengtson and M.E. Goebel
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Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.
Paper Title: Distribution and population structure of Dissostichus eleginoides and D. mawsoni on ... composition, sex ratio and sexual maturity of Dissostichus eleginoides and D. mawsoni from BANZARE Bank were ... shallower banks (<1 000 m), while D. mawsoni was caught on deeper slopes (>1 500 m). Separation of the ... two species by depth may be related to physical intolerance to cooler temperatures because of the lack ... /07 and 2008/09 seasons (Table 1). Discussion Yukhov (1972) suggested that the distribution of ... ) surveyed the stock status of coastal D. mawsoni in Divisions 58.4.1 and 58.4.2 (East Antarctica) and ... clarify the lifecycle of this species in BANZARE Bank and adjacent East Antarctica. This study ... L.J. López Abellán. 2009. Status of the coastal stocks of Dissostichus spp. in East Antarctica ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Auteur(s): Taki, K., M. Kiyota, T. Ichii and T. Iwami
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Acoustic estimates of krill density at South Georgia, 1981 to 1998
Paper Title: Acoustic estimates of krill density at South Georgia, 1981 to 1998 Abstract ... / Description: Acoustic estimates of densities of Antarctic krill, Euphausia superba, at South Georgia during ... 1994 austral summer seasons were characterised by particularly low densities of krill (upper 95 ... % confidence limits <15 g m-2). For five of the summers between 1990 and 1998 it was possible to calculate ... the east of South Georgia (high variance) only 15 of the possible 210 four-transect means fell ... available. The east/west variability could be caused by differing rates of krill flux, differing predation ... western end of South Georgia than the east (Everson, 1984; Boyd, 1993; Trathan et al., 1998), and the ... . Krill abundance is usually higher to the east of South Georgia than to the west. This may be due to ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 47–57 : Auteur(s): Brierley, A.S., J.L. Watkins, C. Goss, M.T. Wilkinson and I. Everson
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Phytoplankton: Trophic modelling of the Ross Sea
. Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... and loss, by grazing of zooplankton and through death and sinking of phytoplanktonic material. The ... relative importances of grazing of phytoplankton by zooplankton, and loss of phytoplankton due to sinking ... the summer, and much higher values in the winter. We use a value in the middle of these literature ... 1 Phytoplankton: Trophic modelling of ...
Document : Site Section: Publications
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Seals: Trophic modelling of the Ross Sea
. Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... to carbon using a ratio of 0.4 gC/gWW (Vinogradov 1953; Curl 1962). These three methods differed ... Heidelberg New York, pp 516-533. Curl, H.S. 1962. Analyses of carbon in marine plankton organisms. Journal ... . Southwell, C. 2005. Diving behaviour of two Ross seals off east Antarctica. Wildlife Research 32(1): 63-65 ... loss due to adult mortality; (2) pups dying before reaching adulthood. The average weight of a pup ...
Document : Site Section: Publications