Résultats de la recherche

1. The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring Program

   in the CEMP. The extensive dependence of this species in these ISRs on Euphausia superba, (including ... in winter), its residence in the ISRs in winter and its early attainment of sexual maturity are all ... features of special relevance to the CEMP. File:  30-Croxall-and-Williams.pdf ... years at Bird Island, South Georgia and at the South Shetland Islands (both within Integrated Study ... ). Only in one year (1985) did the proportion of E. superba fall below 65%. During the winters of 1987 ... CONSIDERATIONS 4.1 Resident Species Gentoo penguins remain in the vicinity of their breeding colonies year ... since 1976 at Bird Island, South Georgia (Croxall et al., 1988a; Williams, 1990), and in most years ... penguin meets the specified criteria qualifying species for inclusion in the CEMP. The extensive ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 483–488 : Auteur(s): Croxall, J.P. and T.D. Williams

2. Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000

   line-transect acoustic survey data gathered in the boxes during austral summers from 1996 to 2000 ... 80 km transects in each box, providing about 1 600 density estimates per box. The MaxEnt technique ... × 0.5 km cells in each box, taking explicit account of the spatial relationship between densities in the ... observed data. Despite some very large interannual and regional differences in mean krill density, the ... year to the next in the MaxEnt reconstructions. These are not immediately obvious in the acoustic ... (MaxEnt) have been used successfully for many years in numerous branches of physical science to ... . Although there are some very large differences in mean krill density between years (ranging from 36 to 12 ... consistent features between years for each box. In the west, in three of the four years for which data are ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Auteur(s): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins

3. Investigations of required sampling regimes for environmental parameters

   speed continuously or as daily maxima and minima would be sufficient to detect a 10 to 20% change in ... / Description:  The sensitivity of different sampling regimes in identifying inter-annual changes in ... 1987. Strong daily, depressional (4 to 5 days) and yearly cycles were seen in temperature, wind speed ... and pressure. Sampling daily maxima and minima would be sufficient to detect a 2 to 3°C change in ... temperatures in that 563 year were lower than for the other two years (see Figure 1). Maximum and minimum ... would be sufficient to detect a 10 to 20% change in monthly mean log-transformed wind speed a of 0.05 ... Working Group (1989) suggested that sampling strategies should be able to detect a 10% or 20% change in a ... -30 per month) may produce data sufficient to identify 10% changes in maximum wind speed in January ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 561–573 : Auteur(s): Agnew, D.J.

4. Beyond MSY: a consideration of definitions of management objectives

   different guidelines under more realistic population models, taking account of the objectives set out in ... Article II of the CCAMLR Convention. The criteria will depend on whether the main concern is with ... nominal effort each year, based on the values of F and fishing effort in the most recent years. Since ... negative, even in the absence of fishing when strong year-classes are being replaced by weak ones ... largest stock in the data series, the MNR for plaice being indeterminate but certainly less than 30 ... that improvements in fishing efficiency can mean that a control (e.g. that no more than 20 trawlers ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Auteur(s): Gulland, J.A.

5. A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3

   there must have been at least one encounter with an FPV in a year; no encounters in a year are ... measures. Three years were analysed: 1998/99, 1999/2000 and 2000/01. Each year fully covered the period 1 ... highly skewed, with medians in the three years of 621, 2 852 and 550 birds respectively. 95% confidence ... , and confidence intervals for, fish and bird catches by IUU vessels. In order to estimate an IUU catch ... encounter with an FPV in a year; no encounters in a year are interpreted as zero IUU fi shing. For each IUU ... analysed: 1998/99, 1999/2000 and 2000/01. Each year fully covered the period 1 October to 30 September ... levels of IUU activity. Each year CCAMLR has made estimates of the level of IUU catch in Subarea 48.3 ... ) sightings of IUU incidents by year (Agnew, 2004). Year % of the year spent patrolling in Subarea 48.3 ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Auteur(s): Agnew, D.J. and G.P. Kirkwood

6. Mesopelagic fish of the Southern Ocean - summary results of recent Soviet studies

   these species are summarized in tables with details on area, season and source of data. Some data, e.g ... . length composition of samples, are also illustrated in figures. The importance of studies on the role of ... myctophids in the Antarctic ecosystem is highlighted. File:  26-Sabourenkov.pdf ... distributed and abundant, with more than 20 species found in the area. Most of them have a circumpolar ... dense concentrations. In the sub-Antarctic area there are about 20 species of myctophids and about 13 ... . In general, myctophids of the Antarctic open waters (Lubimova et al., 1983b) feed all year round and ... and the Antarctic Convergence areas (between 20° and 30°W) had statistically different length (SL ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 433–457 : Auteur(s): Sabourenkov, E.N.

7. Growth and natural mortality of Patagonian rockcod (Patagonotothen guntheri shagensis) from Shag Rocks shelf

   -weight data of research and fishery survey cruises in the Shag Rocks area from 1978 to 1986. The natural ... of natural mortality M=0.8 was used in calculations and the optimal age and length for harvesting ... Patagonian rockcod were found to be 2.5 years and 12.6 cm. File:  09-Shilbanov.pdf ... 30 g weight and age of 2 to 3 years. The sex ratio of fish is actually the same in all size classes ... - t' mean age of fish, 3.42 years age of year class which is fully represented in catches and does ... , % 60 -40 20 n=1470 2. 3 Lt 5 6 Age, years Figure 2: Age composition of P.g. shagensis in ... of 2 to 5 years are most abundant. Sexual maturity is attained by fish at 11 to 13 cm length, 20 to ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 111–121 : Auteur(s): Shlibanov, V.I.

8. Status of the Polish FIBEX acoustic data from the West Atlantic

   / Description:  Acoustic data from the Polish FIBEX survey in the West Atlantic were analysed using recent ... densities of krill in the oceanic parts of the Drake Passage were low (3 g m-2); however, the results also ... in the Bransfield Strait. These results are discussed in the context of spatial and seasonal ... focus of commercial fishing activity in recent years (cf. Everson and Goss, 1991; Ichii et al., 1994 ... , Madingley Road Cambridge CB3 OET, United Kingdom Abstract Acoustic data from the Polish FIBEX survey in ... , 1991a). This analysis indicated that the acoustic densities of hi l l in the oceanic parts of the ... density. High acoustic densities of krill(77 g m-') were also present in the Bransfield Strait. These ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 125–132 : Auteur(s): Trathan, P.N., J. Kalinowski and I. Everson

9. The use of predator-derived krill length-frequency distributions to calculate krill target strength

   calculated from acoustic data. Changes in the lengthfrequency distribution of krill over a period of a few ... weeks produced a 10% difference in TS, whereas simultaneous samples from predators and nets produced ... to be independent to avoid interrelated estimates. For South Georgia, there is a 20-year time ... split year, i.e. 1993/94 = 1994) from carapaces in scat samples collected during the lactation period ... samples were collected during the same 5-10 day period as net samples in each year. Net samples of ... ). Year TSnet TSPred Difference (dB kg1) (dB kg-') ("/.l Table 2: The percentage difference in target ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 155–163 : Auteur(s): Reid, K. and A.S. Brierley

10. Temporal variability and the interrelationships between CEMP parameters collected on Adélie penguins at Béchervaise Island

    Adélie penguins at Béchervaise Island Abstract / Description:  Temporal variability in a series of CCAMLR ... output from the Automated Penguin Monitoring System (APMS), were also examined in terms of their ... examined for Adélie penguins over a period of 12 years. Data were collected from 1990/91 to 2001/02 at ... while other parameters, such as arrival counts and incubating nest counts, are more stable between years ... beginning of the year, the decline in condition of the females until egg laying, the decline in condition ... to 20, 15 and Emmerson et al. 79 Temporal variability and interrelationships in CEMP parameters ... 90 30 / 11 / 19 90 05 / 12 / 19 90 20 / 12 / 19 90 25 / 11 / 19 90 18 / 12 ... 97 30 / 11 / 19 97 03 / 12 / 19 97 20 / 12 / 19 97 21 / 11 / 19 97 20 / 12 ...

    Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 75–90 : Auteur(s): Emmerson, L.M., J. Clarke, K.R. Kerry and C. Southwell

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