Résultats de la recherche
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The effects of monitoring procedures on Adélie penguins
/92. This contrasts with the results of Ainley et al. (1983) who found that the survival rate of ... birds with new bands was 28% lower than that of birds with bands older than one year. However, the ... with multiple foraging trips during chick rearing. We have noted that three females banded in 1990/91 ... implanted transponders versus bands has yet to be proven. We have found that a small proportion ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 155–164 : Auteur(s): Clarke, J. and K. Kerry
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Distribution of krill (Euphausia superba Dana) catches in the South Shetlands and South Orkneys
, foraging ranges and population sizes from the literature are used to show that for some years catches ... within 100 km of predator colonies between December and March may be up to 45% of the land-based predator ... is likely to emerge in areas of high overlap between predators and the fishery earlier than would be ... Statistical Bulletin were the first clear suggestions that the fishery might be regularly located in quite ... by first taking the initial estimate of the catch to be equal to the lower catch bound for that ... same sorts of ratios of catch to be withstood by the prey stock as in other ecosystems, and that ... sustainable exploitation rate, with the implication that these levels will not impact adversely on predator ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 287–303 : Auteur(s): Agnew, D.J.
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Histological study on the ovarian development of mackerel icefish (Champsocephalus gunnari) from the South Georgia Islands
individuals (45%) was found, together with a relatively low occurrence of females that spawned or were in ... using microscopes (microscopical scale) was elaborated and adapted to correspond with the macroscopic ... (i.e., unaided visual observation) scale commonly used. The first five stages correspond with those ... that the eggs of the species could be demersal. This was also reported for other channichthyids ... indicates that no immature elements are incorporated into the cohort of yolky oocytes that will be ... , these data should be treated with caution because of the relatively low number of individuals in the ... correspond with the macroscopic (i.e., unaided visual observation) scale commonly used. The first five ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 35–49 : Auteur(s): Macchi, G.J. and E.R. Barrera-Oro
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Diurnal variations in biological characteristics of krill, Euphausia superba Dana, to the west of the South Orkney Islands, 24 March to 18 June 1990 - based on data reported by a biologist-observer
average size of males was consistently larger than that of females (Makarov, 1991). It should be stressed ... that 50% level of sex ratio of E. superba for all samples from every station corresponded with ... occupy deep layers, the segregation by size does not occur (Station VI). It may be concluded that ... be several causes of this decrease (see also Vagin, 1991 - Figure 2). It may be connected with post ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 201–222 : Auteur(s): Vagin, A.V., R.R. Makarov and L.L. Menshenina
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Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia
provide an estimate that is unaffected by confounding effects mainly due to recruitment variation, but ... of harvesting, when by definition F will be zero, Z will equate to M so that a good estimate can be ... ), although that paper proposes a value of 0.55) and 0.35 (from SC-CAMLR, 1988) should be used. The ... Mean age 5.8 4.9 4.3 4.1 These results indicate that the mortality rate is probably increasing with ... intervals associated with the mean values, it is impossible to determine whether the results should be ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Auteur(s): Everson, I
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The status of krill (Euphausia superba DANA) resources in CCAMLR Statistical Divisions 58.4.2 and 58.4.3 from 1988 to 1990. Results of acoustic surveys
paper. It was found that the increase in krill biomass observed in the area in 1990 is linked with the ... abundant 1986 and 1987 year-classes and with a diminished rate of emigration of krill of these year-classes ... ). Results of surveys conducted from 1988 to 1990 are discussed in the paper. It was found that the increase ... in krill biomass observed in the area in 1990 is linked with the abundant 1986 and 1987 year-classes ... and with a diminished rate of emigration of krill of these year-classes from the area in 1989/1990 ... bridge device with a working frequency of 136 kHz. A copper ball, 26 mm in diameter, was used to ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 163–173 : Auteur(s): Bibik, V.A. and V.N. Yakovlev
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Research currently being undertaken by the Republic of South Africa on "dependent and related species" within the Antarctic marine ecosystem
,t sea be used to Predict Pec:ul iar oceano-sraf'hic conditions, Perhaps associated with ... ,;;:blrd mal:I be .:JP.line,.1 as. onl?" that obtains it.s food f-:-011 the il@.!, f11•asdho 1tF>e ... indici.i=ted that two -fur 5P.<~I species were interminSI in~! and possibl!:1 interb1·t~edin9 on the ... consi!;t Pl'im:at'il:i of fish e..!lr stnne5, or utol rths, s'lul,::1 mandible!i or be-aJ.:.s and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 59-77 : Auteur(s): South Africa
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Biological characteristics of Antarctic fish stocks in the southern Scotia Arc region
sexual maturity and length at first spawning indicate that in some species final maturation of the gonads ... southerly grounds than at South Georgia. The distribution of gonadosomatic indices in March suggested that ... were provided in Table 3. Some results should be regarded with considerable caution: samples of L ... only four to six weeks. The range of egg diameters appeared to be low in most species with the ... years. The area with the largest influence of Weddell Sea water appeared to be the South Orkney ... that could not be ruled out was that C. gunnavi in the Elephant Island-South Shetland Islands area ...
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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Optimization of survey sampling design in the detection of interannual variability and prey size selectivity in the diet of penguins
penguins and krill to be used in the detection of inter-annual variability in the parameters concerned are ... recommended and a required sampling protocol is suggested. A table of minimal numbers of penguins to be ... . Restrictions have been fixed in accordance with the recommendations of the fourth meeting of WG-CEMP: minimum ... that the value of 0"2 which we wish to detect will be 7.350. From (1) the cri can be expressed as a ... used for other purposes, we recommend that either all krill present be recorded or that the sample be ... abovementioned assumption, It is to be noted that this design requires all penguins involved to be sampled on ... each level in nested ANOV A designs. The optimal numbers of penguins and krill to be used in the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 551–559 : Auteur(s): Marschoff, E. and B. Gonzalez
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Methodological guidelines on the assessment of trawl catchability of krill by means of statistical modelling
of various configurations. The algorithm for solving this problem is constructed in such a way that ... it can be applied without alteration for the assessment of the effectiveness of trawl nets of any ... equations and two double inequalities). The proposed algorithm can be realised by computer in algorithmic ... configurations. The algorithm for solving this problem is constructed in such a way that it can be applied ... two double inequalities). The proposed algorithm can be realised by computer in algorithmic ... . npH 9TOM npe~nOJlaraeTCH, ~TO npH onpOKH~BaHHH HrOJlKa Be~eT ce6H KaK TBep~oe TeJlO C 3aKpenneHHoH ... onpe,neJleHHE YJlOBHCTOCTH U He ,IJ;OCTHrHYTa, Be,IJ;b qeM BHme TOqHOCTb paCqeTa, TeM 60JlbIDee ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 195-222 : Auteur(s): Kizner, Z.I.