Résultats de la recherche

1. Sources of variance in studies of krill population genetics

   . superba and the boreal species Meganyctiphanes norvegica that used allozymes found no evidence of genetic ... :  There has been a long-term interest in the population genetics of Antarctic krill species because of ... their ecological and economic importance. The possibility that there are distinct genetic stocks of ... these species would affect the design of management strategies for their conservation. A recent ... differences between krill collected from the Weddell Sea and South Georgia but revealed no differences ... PCR products for individuals that had lost the Rsa I site used in the SSCP assay, so that one ... Southern Ocean. From one site in the Mertz Glacier Polynya, krill had been captured in two net tows at ... population struc- ture of krill (Euphausia superba Dana) from the Prydz Bay region of Antarctic waters ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 107–116 : Auteur(s): Jarman, S.N. and S. Nicol

2. Improving estimates of Adélie penguin breeding population size: developing factors to adjust one-off population counts for availability bias

   illustrated using data collected at the Béchervaise Island CEMP site in 2007/08. Estimates of the breeding ... penguins that left the breeding site prior to the reference point because their breeding attempt failed ... , breeding-age penguins that failed to return to the breeding site in that breeding season, nor pre-breeding ... presented for the collection and development of data to adjust counts of Adélie penguins made at any time in ... independent of nest sites and move around the breeding site from mid-January onwards. Nevertheless, further ... method is illustrated using data collected at the Béchervaise Island CEMP site in 2007/08. Estimates of ... will not account for penguins that left the breeding site prior to the reference point because their ... breeding attempt failed, breeding-age penguins that failed to return to the breeding site in that breeding ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 229–241 : Auteur(s): Southwell, C., J. McKinlay, L. Emmerson, R. Trebilco and K. Newbery

3. Sensitivity analysis for parameters of predatory species CCAMLR Ecosystem Monitoring Program

   such a treatment of data obtained at the Magnetic Island Adélie penguin colony in Prydz Bay in the 1987 ... Program Abstract / Description:  Following the request of the Scientific Committee of CCAMLR to conduct ... /88 and 1988/89 breeding seasons. The data on the following parameters were analyzed: adult weight on ... Magnetic Island Adelie penguin colony in Prydz Bay in the 1987/88 and 1988/89 breeding seasons. The data ... simulated, and variances estimated if no real data exist, the use of actual data with 'real' variance ... parameters, collected at the Magnetic Island colony in Prydz Bay (68°33'S, 77°54'E) in the 1987/88 and 1988 ... ) (Figures 2a to 2d). There was no significant difference between the study colonies in length of either ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 411–432 : Auteur(s): Whitehead, M.D.

4. Integrating Count Effort by Seasonally Correcting Animal Population Estimates (ICESCAPE): a method for estimating abundance and its uncertainty from count data using Adélie penguins as a case study

   reported measures of uncertainty associated with originally published counts are propagated through to the ... for a site is used when none exists. Importantly, a common standardisation procedure allows site ... , the method is applied to several examples of published studies of Adélie penguin abundance at breeding ... breeding pairs, although the software has been developed to accommodate adjustment and aggregation of other ... variable. The numbers of breeding Adélie penguins, nests and chicks present at a site are known to vary ... during the breeding sea- son when weather and other determinants of site access permit, while the latter ... availability curves if no availability information exists for a site. Surrogate curves, if necessary, are ... each replicated date is obtained by randomly selecting a curve from the pool available for a site and ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 213–227 : Auteur(s): McKinlay, J., C. Southwell and R. Trebilco

5. Variations in echosounder calibration with temperature, and some possible implications for acoustic surveys of krill biomass

   biomass by acoustic techniques is dependent on a number of factors of which one of the most fundamental is ... accurate echosounder calibration. The Simrad EK500 scientific echosounder used aboard RRS James Clark Ross ... those applied in the Antarctic, even after adjustments have been made to account for differences in ... at both 38 and 120 kHz between calibrations conducted at the two locations. At 120 kHz, the required ... employed during surveys around South Georgia, and no account were taken of the differences in gain ... Fjord, Norway, under the supervision of Simrad engineers. Both Stromness Bay and Uggdalseidet Fjord ... respective research cruises and the calibration site. Variations in Echosounder Calibration with ... Stromness Bay, the sea temperature at the depth of the transducers (approximately 6 m) was typically 2.3 ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 273–281 : Auteur(s): Brierley, A.S., C. Goss, J.L. Watkins and P. Woodroffe

6. Trends in population size and breeding success at colonies of macaroni and rockhopper penguins, Marion Island, 1979/80–1995/96

   for rockhopper penguins were 0.68 eggs and 0.48 respectively. The largest of the three macaroni ... penguin colonies investigated decreased in size over the study period, while the other two remained stable ... . The only significant relationship between inter-season trends in the number of pairs breeding at the ... transfer. The larger two of the three rockhopper penguin colonies investigated decreased over the study ... the north of Macaroni Bay and at Archway Bay (Figure 1). From 1979/80 to 1982/83, each colony was ... Penguins There was no obvious long-term trend over the study period in the number of clutches laid at ... Archway Bay and Van den Boogaard River (Figure 2). However, the number of clutches laid decreased at ... of the breeding colonies at Macaroni Bay and Archway Bay were negatively correlated, but numbers of ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 89–103 : Auteur(s): Cooper, J., A.C. Wolfaardt and R.J.M. Crawford

7. Spawning locations of mackerel icefish at South Georgia

   :  Historical information on the distribution of spawning and larval mackerel icefish (Champsocephalus gunnari ... inshore spawning at South Georgia during April within and close to the bays on the north side of the ... island. Some spawning almost certainly occurs over much of the island shelf, although is this appears to ... . There are also indications of a possible second spawning season in January, although the evidence is ... following day, two on 20 March and 14 on 30 March. 011 5 April the catch was just three, and no further ... 1978. No such concentrations had been present there when the same bays had been sampled in February ... East Bay. The nets were generally set in the late afternoon and hauled early the following morning ... Bay on a transect running along the mail7 axis of the bay (North, 1987; 1990; North and Murray, 1992 ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 107–118 : Auteur(s): Everson, I., A.W. North, A. Paul, R. Cooper, N.C. McWilliam and K.-H. Kock

8. Australian research on Antarctic bird and seal diets

   data on the diets of important vertebrate predator species in Prydz Bay and around the sub-Antarctic ... Heard and Macquarie Islands have been collected during the last seven years. Published and unpublished ... results are collated and summarised, and several important points emerge. In Prydz Bay, on which is ... cantered the CCAMLR Ecosystem Monitoring Programme's priority study area, Euphausia superba forms a ... species in Prydz Bay and around the sub-Antarctic Heard and Macquarie Islands have been collected during ... important points emerge. In Prydz Bay, on which is centered the CCAMLR Ecosystem Monitoring Programme's ... Davis Station (68°30'S:77°50'E), in the south-eastern corner of the Prydz Bay Priority Area of CEMP ... well as other locations in Prydz Bay. Most work has concentrated on the Adelie penguin, Pygoscelis ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 231-249 : Auteur(s): Williams, R.

9. Small scale krill surveys: simulations based on observed euphausiid distributions

   Abstract / Description:  An observed distribution of aggregations of the euphausiid, Meganyctiphanes ... norvegica is used to model the effects of krill swarm orientation and shape on the success of two proposed ... survey designs. The simulation involves a number of random paths of parallel or radially arranged ... transects passing through three distributions each of which is given four rotations. The results indicate ... fueran tan altos como los que se obtuvieron en las simulaciones. 1. INTRODUCTION During the FIBEX and ... S.E. WAYTE. 1988. Hydroacoustic surveys of the distribution and abundance of krill: Prydz Bay region ... Meganyctiphanes norvegica in the Bay of Fundy. 1. Plankton Res. 8(1): 29-39. SC-CAMLR. 1990. Report of the Ninth ... , directed at regions around CEMP sites for the duration of CEMP predator parameter monitoring; these may ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 245–256 : Auteur(s): Agnew, D.J. and S. Nicol

10. A rationale for conservation areas within Antarctic waters

    :  The application of potential conservation measures listed in Article IX 2 of the Convention requires ... ‘the designation of regions and sub-regions based on the distribution of populations of Antarctic ... , first priority has been given to surface circulation of southern waters and the distribution of krill ... . This has been supplemented by (limited) information on the distribution of major consumers including ... previously recorded density in location F (6.56/km2 ). No data were available on the densities of seals ... on pack ice during the summer in locations C, D and E. Gilbert and Erickson found no correlation ... in the eastern margin of the Ross Sea, the coast adjacent to the prydz Bay gyre, and on the ... also on the eastern margin of the Ross Sea, the coast adjacent to the prydz Bay gyre, as well as to ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 513-535 : Auteur(s): Chittleborough, R.G.

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