Résultats de la recherche
-
A first step towards modelling the krill–predator dynamics of the Antarctic ecosystem
ecosystem Abstract / Description: The history of human harvests of seals, whales, fish and krill in the ... hypothesis of a krill surplus in the mid-20th century is described, and the information on population and ... ) species. The model commences in 1780 (the onset of fur seal harvests) and distinguishes the Atlantic ... /Indian and Pacific Ocean sectors of the Southern Ocean in view of the much larger past harvests in the ... gunnari) became a target of the former Soviet Union fleets in the mid- 1970s, and the mean annual catch ... emphasised. The background to the hypothesis of a krill surplus in the mid-20th century is described, and ... Southern Ocean in view of the much larger past harvests in the former. A reference case and six ... history of human harvesting in the Antarctic The Antarctic is a region where the largest human-induced ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 217–277 : Auteur(s): Mori, M. and D.S. Butterworth
-
Research currently being undertaken by the Republic of South Africa on "dependent and related species" within the Antarctic marine ecosystem
Paper Title: Research currently being undertaken by the Republic of South Africa on " ... components of the biological sciences programme are described. The primary objective of the studies being ... undertaken is to improve our understanding of the ecology of important predators (especially seals and ... seabirds) and their prey (especially krill and squid) in the Antarctic, and closely related marine ... the mammal fauna -- msinl::,i sea Is - in the southern ocean~; and on the i~;1ands south of sc>l ... ;w:; comPo~;ition of the POPulation hove also been described. In addition, studies havt? been undc ... durins 1!J73 and indicate a decrease of 5 to 11 Per cent Per !:lear in the flOPulations at Mari on (4 ... cow nu11'1bers, also be of iw,Portance - the latt,er aspects is be in~ i n1,1est i !'lated. The ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 59-77 : Auteur(s): South Africa
-
Histological study on the ovarian development of mackerel icefish (Champsocephalus gunnari) from the South Georgia Islands
Paper Title: Histological study on the ovarian development of mackerel icefish (Champsocephalus ... on ovarian development in Champsocephalus gunnari caught by the RV Dr Eduardo L. Holmberg in the ... South Georgia and Shag Rocks areas in February and March 1994. Six phases of oocyte development were ... generalised regression was found, which was observed in 41% of mature fish. A high proportion of juvenile ... Eduardo L. Holrnberg in the South Georgia and Shag Rocks areas in February and March 1994. Six phases of ... based on the generalised oocyte resorption process found in a high proportion of individuals caught ... in summer 1991 and the concurrent scarcity of krill in the area (Everson et al., 1991). Most ... species, the histology of reproduction has been studied only partially (Everson et al., 1991). In this ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 35–49 : Auteur(s): Macchi, G.J. and E.R. Barrera-Oro
-
Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990
discussions and analyses of the data from a survey from MV Hill Cove in January 1990 and RV Akademik Knipovich ... increase in the estimated standing stock of Champsocephalus gunnari. The paper describes the ways in which ... Paper Title: Analysis of results from demersal fish surveys at South Georgia, undertaken by the ... in February 1990 around South Georgia. Both surveys were characterized by large numbers of small ... analyses of the data from a survey from MV Hill Cove in January 1990 and RV Akademik Knipovich in ... interspersed with a few large catches. The small number of large catches cause a disproportionate increase in ... the estimated standing stock of Champsocephalus gunnari. The paper describes the ways in which these ... Knipovich had only returned to Sevastopol at the end of May 1990 and this had left little time in which to ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Auteur(s): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)
-
Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald Islands using catch-at-age and aged mark-recapture data from the main trawl ground
to 2008. A large proportion of the recaptures of fish released in this fishery were aged and these ... of M have been studied using simulation. In application to the data obtained for the HIMI main trawl ... 0.055 to 0.250 (based on a Poisson over-dispersion estimate of 3). In contrast, the BODE model gave ... Paper Title: Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald ... mean estimate of M of around 0.15. If the selectivity in Ground B is similar to that simu- lated by ... (D. mawsoni) in the Ross Sea (Subarea 88.1) (Dunn and Hanchet, 2007) apply a fixed value of M of ... M of 0.13 y–1 in Hillary et al. (2006) was based on Beverton-Holt invariants. The estimate of M ... -dispersion estimate of 3). In contrast, the BODE model gave unrealistic estimates of M and the annual ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 29–45 : Auteur(s): Candy, S.G., D.C. Welsford, T. Lamb, J.J. Verdouw and J.J. Hutchins
-
Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea
Islands in 2004. Intensive analysis of otoliths from these specimens greatly increased confidence in the ... interpretation of otolith growth zone structure, supporting the otolith interpretation protocol used in previous ... Paper Title: Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from ... the Ross Sea Abstract / Description: Juveniles of the macrourid Macrourus whitsoni were collected by ... BioRoss survey of the western Ross Sea and Balleny Islands in 2004. Intensive analysis of otoliths from ... these specimens greatly increased confidence in the interpretation of otolith growth zone structure ... the total landed catch. In the 2004 sea- son, about 297 tonnes of M. whitsoni were reported as having ... ) were read. To increase confidence in the accuracy of their age estimates, it was proposed to prepare ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 291–303 : Auteur(s): Marriott, P.M., M.J. Manning and P.L. Horn
-
The foraging range of Adélie penguins at Béchervaise Island, Mac. Robertson Land, Antarctica, and its overlap with the krill fishery
when the sea became ice free to the coast. Concentrations of krill, Euphausia superba, which have in ... . Robertson Land Coast (approximately 150 000 pairs) and any future harvest of krill in the region. The ... in the South Shetland and South Orkney Islands and reflects the distance offshore of krill, one of ... Paper Title: The foraging range of Adélie penguins at Béchervaise Island, Mac. Robertson Land ... the sea became ice free to the coast. Concentrations of krill, Euphausia superba, which have in the ... . Robertson Land Coast (approximately 150000 pairs) and any future harvest of krill in the region. The ... birds in the South Shetland and South Orkney Islands and reflects the distance offshore of krill, one ... must remain in the colony to brood, guard and feed their chicks and the frequency of feeding visits ...
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
-
Surface areas of seabed within the 500 m isobath regions within the South Shetland Islands (Subarea 48.1)
Paper Title: Surface areas of seabed within the 500 m isobath regions within the South Shetland ... Islands (Subarea 48.1) Abstract / Description: Bathymetric maps of two major areas within the South ... Elephant Island. From the integrated datasets, areas of seabed within the 500 m isobath for six levels of ... Shetland Islands were generated using several integrated bathymetric databases. These areas comprise the ... measuring the interpolated areas of seabed. In this paper, we integrate several bathymetric databases ... (Figure l), as well as a revised chart of the seabed around Elephant Island (Figure 2). Regions in the ... lower South Shetland Islands not considered in the analysis of seabed areas are those outside the ... Antarctic Peninsula. Estimates of seabed area in the lower South Shetlands for the strata examined were ...
Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 133–140 : Auteur(s): Jones, C.D., S.N. Sexton and R.E. Cosgrove III
-
The foraging range of Adélie penguins – implications for CEMP and interactions with the krill fishery
Paper Title: The foraging range of Adélie penguins – implications for CEMP and interactions with ... the krill fishery Abstract / Description: This paper presents a summary of the foraging locations of ... -scale krill catch data for the regions of interest. The potential for overlap with krill fishing occurs ... particularly where ice conditions permit the fishing fleet to approach the edge of the continental shelf or ... overlap between the foraging areas of these birds and the areas where krill fishing has taken place in ... the previous seasons was demonstrated only in the case of Bechervaise Island (67"311S, 62'49'E) near ... the foraging areas of penguins at locations in the Antarctic Peninsula region (Subarea 48.1) was ... undertaken are shown in Figure 1. The numbers of penguins tracked, the numbers of trips and the years over ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 75–87 : Auteur(s): Kerry, K.R., J.R. Clarke, S. Eberhard, H. Gardner, R.M. Lawless, S. Corsolini, S. Focardi, E. Franchi, D. Rodary and R. Thomson
-
Breeding numbers and success of Eudyptes penguins at Marion Island, and the influence of mass and time of arrival of adults
, there was substantial correlation in the numbers of adults breeding at study colonies of macaroni ... Oscillation event of 1997/98, there was no significant correlation in mass on arrival between the two species ... Paper Title: Breeding numbers and success of Eudyptes penguins at Marion Island, and the ... filholi) over 22 years, suggesting that overwintering conditions may influence the proportions of birds ... was substantial correlation in the numbers of adults breeding at study colonies of macaroni penguins ... Oscillation event of 1997/98, there was no significant correlation in mass on arrival between the two species ... species of Eudyptes (crested) penguins breed at Marion Island (46.9°S 37.9°E), one of two islands in the ... reports trends in the numbers breeding and breeding success at study colonies of the two Eudyptes ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 175–190 : Auteur(s): Crawford, R.J.M., B.M. Dyer, J. Cooper and L.G. Underhill