Résultats de la recherche

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

   Paper Title:  Variations in echosounder calibration with temperature, and some possible ... VARIATIONS IN ECHOSOUNDER CALIBRATION WITH TEMPERATURE, AND SOME POSSIBLE IMPLICATIONS FOR ACOUSTIC SURVEYS ... profundidad Variations in Echosounder Calibration with Temperature del transductor = 2,3"C) fueron ... that the materials used to construct transducers made them susceptible to changes in character with ... backscattering (S,,) transducer gains are determined by adjusting gain settings in accordance with equations ...

   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

2. Intra-annual variability in the density of Antarctic krill (Euphausia superba) at South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ‘annual’ estimates of krill density

   estimates with the observed pattern of within-year variability showed that some of the apparent ‘year-to ... the regression-predicted within-year variation. Years that stand out for markedly low krill density ... South Georgia, 2002–2005: within-year variation provides a new framework for interpreting previous ... g m –2, SD = 24.3), but had risen substantially by summer in each year (mean = 89.5 g m –2, SD ... detected high within-year varia- tion in krill density, and a sinusoidal regression model, with time as ... region. Comparison of pre- vious acoustic survey estimates with the observed pattern of within-year ... resident krill population, but were consistent with the notion of large infl uxes of krill in early summer ... estimate with an upper 95% confi dence limit of less than 15 g m–2 is indicative of a ‘low’ krill year ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 27–41 : Auteur(s): Saunders, R.A., A.S. Brierley, J.L. Watkins, K. Reid, E.J. Murphy, P. Enderlein and D.G. Bone

3. Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects

   distribution, random vessel effects and random stratum-by-year effects Abstract / Description:  The current ... generalised linear model (GLM) with a square-root link function and a unit variance function. A time series of ... standardised CPUE estimates and their precision can be obtained from the ‘fishing year’ parameter estimates ... together with ‘baseline’ parameter estimates, their variance–covariance matrix, and the inverse-link ... early years of the fi shery and the effect this can have on ‘treatment’ (i.e. YEAR) fi xed-effect ... number of year classes, each with a different weight distribu- tion. Also, number of fi sh caught may be ... the national- ity fi xed-effect term redundant), two vessels were completely confounded with YEAR ... 9 is that there was an increase in CPUE in the second year of the trawl fi shery, with a sharp ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Auteur(s): Candy, S.G

4. A stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea Region incorporating multi-year mark-recapture data

   of tagged fish and subsequent multi-year data of recapture of tagged fish in conjunction with fishery ... Sea Region incorporating multi-year mark-recapture data Abstract / Description:  An exploratory ... hence a multi-year mark-recapture tagging program was initiated by New Zealand fishing vessels in 2001 ... model was developed for Antarctic toothfish in the Ross Sea region that incorporates multi-year release ... subsequent multi-year data of recapture of tagged fish in conjunction with fishery catch-at-age data. This ... with a very high YCS in the final year, regardless of the time period over which YCS were estimated ... explora- tory fishery demonstrates the value of the multi- year tagging programs even with low recapture ... . Between 2 000 and 3 800 toothfish have been tagged and released in the RSR each year since 2004. The ...

   Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 39–62 : Auteur(s): Mormede, S., A. Dunn and S.M. Hanchet

5. Evaluating the impact of multi-year research catch limits on overfished toothfish populations

   Paper Title:  Evaluating the impact of multi-year research catch limits on overfished toothfish ... 75-year projection time frame in the absence of fishing. With the biological parameters chosen ... the reference scenario (Table 4), with most cases showing recovery rates within ±3 years of that es ... , should aim to produce an as- sessment within a 3–4 year time frame of research commencing (SC-CAMLR ... class in stock 1 year Last age class in stock 35 years Oldest age in initial structure 36 years ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 47–55 : Auteur(s): Welsford, D.C

6. Erratum and Addendum - Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects – CCAMLR Science, 11: 59–80 (2004)

   models, the Tweedie distribution, random vessel effects and random stratum-by-year effects – CCAMLR ... appropriately deal with zero values of y by only excluding con- tributions of loge ijV y to the EQD when 0ijy ... ) using λ = 1.4 were very close to those given in Candy (2004) with the revised Figure 8 ... EffEcts And rAndoM strAtuM-by-yEAr EffEcts CCAMLR Science, 11: 59–80 (2004) S.G. Candy Department ... -deviance for lambda parameter in the Tweedie GLMM with log link. the simulation than equation (7) given in ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 221–222 : Auteur(s): Candy, S.G

7. Low breeding success of the Adélie penguin at Béchervaise Island in the 1998/99 season

   percent of nests with eggs failed during the three weeks following first hatch. A breeding success of 0.43 ... chicks cr6ched per nest was achieved, compared to previous seasons with higher annual breeding success ... , foraging trip duration and diet suggests that the death of chicks during the guard stage was due to an ... masses brought back to the chicks were within the normal range but extended foraging trip durations ... frequency. These findings contrast with observations made in 1994/95 (a season in which all chicks died of ... , mid-incubation count of all nests with eggs, brooded nest count during early guard, and a chick ... birds) and mean fora ing trip duration during the guard stage with the corresponding food defiver rate ... durations in 1998/99 were greater than all years Irvine et a1 Table 3: Mean foraging trip durations ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 151–167 : Auteur(s): Irvine, L.G., J.R. Clarke and K.R. Kerry

8. A review of data on abundance, trends in abundance, habitat use and diet of ice-breeding seals in the Southern Ocean (submitted to the 2008 Joint CCAMLR-IWC Workshop)

   represent the entire pack-ice. From the late 1960s to the early 1980s, Erickson and colleagues made a ... moulting. Breed- ing occurs in late spring and early summer, and moulting in mid- to late summer. For the ... rest of the year, these species spend much of their time foraging in the ocean, but continue to haul ... seals often aggregate in larger groups in fast-ice habitats in early summer when breeding. Data on ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 49–74 : Auteur(s): Southwell, C., J. Bengtson, M. Bester, A.S. Blix, H. Bornemann, P. Boveng and M. Cameron, J. Forcada, J. Laake, E. Nordøy, J. Plötz, T. Rogers, D. Southwell, D. Steinhage, B.S. Stewart and P. Trathan

9. Commercial krill fisheries in the Antarctic, 1973 to 1988

   ) fishery between 1972/73 and 1987/88. The annual krill catch rose gradually to a peak of some 500 000 ... (April to August). Trends in the fishery with respect to independent estimates of krill abundance and ... , 1979). Exploratory fishing for krill as a commercial resource commenced in the early 1960's and ... contain information on catch with respect to year, month, major gear type, vessel type and geographical ... and would not conform with the underlying trend indicated by the total cPH/year (see Figure 12b)). It ... SPLIT YEAR Figure 5: Reported annual krill catches by country in Statistical Area 58. 250 V) UJ ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 229–281 : Auteur(s): Miller, D.G.M.

10. Long-term trends in the foraging patterns of female Antarctic fur seals at South Georgia

    number of feeding trips, with 1979 being the year with the fewest trips made during the entire 20 year ... utilizing tetracycline-marked teeth confirmed that the feeding trip/suckling cycles of females are reflected ... teeth from Bird Island, South Georgia, was analyzed to estimate: 1) birth year of individuals, and 2 ... showed that between 1962 and 1981 the mean number of feeding trips made by female fur seals varied ... feeding trips, with 1979 being the year with the fewest trips made during the entire 20 year period ... tetracycline-marked teeth confirmed that the feeding trip/suckling cycles of females are reflected as ... from Bird Island, South Georgia, was analyzed to estimate: 1) birth year of individuals, and 2) the ... between 1962 and 1981 the mean number of feeding trips made by female fur seals varied markedly. From ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 441-443 : Auteur(s): Bengtson, J.L.

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