Résultats de la recherche

1. 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

   Paper Title:  Integrating Count Effort by Seasonally Correcting Animal Population Estimates ... animal count data to a common reference point of breeding chronology for species with a complex temporal ... function of sampling availability. ICESCAPE (Integrating Count Effort by Seasonally Correcting Animal ... sites in Antarctica. These examples focus on adjusting counts of adults to an effective number of ... Béchervaise Island in years other than 2007/08 and at sites in the Mawson region other than Béchervaise ... IntegratIng Count effort by SeaSonally CorreCtIng anImal PoPulatIon eStImateS (ICeSCaPe): a method for ... animal count data to a common reference point of breeding chronology for species with a complex temporal ... function of sampling availability. ICESCAPE (Integrating Count Effort by Seasonally Correcting Animal ...

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

2. Fishing ground selection in the Antarctic krill fishery: trends in patterns across years, seasons and nations

   remained relatively constant in Subareas 48.2 (March–May) and 48.3 (June–August). In 25 years of krill ... Paper Title:  Fishing ground selection in the Antarctic krill fishery: trends in patterns across ... contributors to the total catch. A recent shift in operational timing towards later months within fishing ... seasons was observed in Subarea 48.1 (December–February to March–May). However, operational timing has ... Science, 3: 13–30. Hewitt, R.P., D.A. Demer and J.H. Emery. 2003. An eight-year cycle in krill biomass ... 02 /0 3 20 03 /0 4 20 04 /0 5 129 Fishing ground selection in the Antarctic krill fishery F ... d at a up t o th e en d o f th e 20 03 / 04 fi sh in g se as on . D if fe ... Fishing ground selection in the AntArctic krill Fishery: trends in pAtterns Across yeArs, seAsons And ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 117–141 : Auteur(s): Kawaguchi, S., S. Nicol, K. Taki and M. Naganobu

3. Catch per unit effort (CPUE) data from the early years of commercail krill fishing operations in the Atlantic sector of the Antarctic

   the period 1975/76 to 1987/88. Comparisons are carried out between subareas in single years, between ... does not occur over time for the entire area. High average CPUE were observed in the years 1975/76 and ... operations in the Atlantic sector of the Antarctic Abstract / Description:  Catch per unit effort (CPUE) data ... are presented from krill fishing operations in CCAMLR Subareas 48.1, 48.2, 48.3 (South Atlantic) for ... and for different years (a to g). (e) Season 1984185 12 10 15 20 25 30 35 40 45 50 55 60 65 ... hours for the split-year (1 July to 30 June); (iii) mean monthly catch/hour for the split-year ... split-year 1975/76, when the CPUE was highest in Subarea 48.3. In other seasons, however, the picture ... much higher in shelf regions for all three subareas compared to oceanic areas. During this year the ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 31–50 : Auteur(s): Siegel, V., V. Sushin and U. Damm

4. Demographic characteristics of the Adélie penguin population on Béchervaise Island after 12 years of study

   , fecundity levels and population numbers) were analysed for the Béchervaise Island Adélie penguin colony in ... changes in annual survival rates, especially of young breeding adults, than to changes in fecundity ... parameters. Results are discussed in comparison with data from a declining Adélie penguin population in the ... Ross Sea studied during the 1960s and 1970s (Ainley et al., 1983), and in relation to other CEMP ... gg ed (m in im um a ge 4 y ea rs ) 76 54 59 30 20 28 10 25 17 30 (a ) N um be rs ... at year 0, x is years and r is the annual rate of population increase (Figure 1). In terms of ... year (Table 1). Breeding success was calculated in terms of chicks per nest with eggs for each season ... detect signifi cant changes in adult survival, and only a long time sequence of data prevents year-to ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 53–74 : Auteur(s): Clarke, J., L.M. Emmerson, A. Townsend and K.R. Kerry

5. Target strengths of krill at 136 and 20 kHz

   Paper Title:  Target strengths of krill at 136 and 20 kHz Abstract / Description:  Estimation of ... the mean single-krill target strengths range from-71 to-77 dB at 20 kHz. Trawl hydroacoustic method ... . At the same frequency for aggregations with mean lengths in the range 41 to 47 mm the mean single ... -krill target strength is in the range-76 to-81 dB. File:  08-Kasatkina.pdf ... Krill Target Strength at Frequency 20 kHz (2) (3) Experiments were conducted in the South Orkney ... . Krill ranging in size from 30 to 58 mm in length were caught. The modal group was between 41 and 44 mm ... strength assessment at a frequency of 20 kHz are presented in Table 1. Cage target strength and the number ... majority of males (98.7%) were at Stage v. In the Maude Rise area krill ranging from 30 to 51 mm in ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 141–157 : Auteur(s): Kasatkina, S.M.

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

   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 ... of tagged fish and subsequent multi-year data of recapture of tagged fish in conjunction with fishery ... Paper Title:  A stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in the Ross ... . _______________________________________________________________ 1 The CCAMLR fishing season starts on 1 December and ends on 30 November in the following year ... Antarctic toothfish in the Ross Sea region that incorporates multi-year release of tagged fish and ... subsequent multi-year data of recapture of tagged fish in conjunction with fishery catch-at-age data. This ... catch for Antarctic toothfish in the RSR, by fishery, as well as the catch limit in each year, is ...

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

7. 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

   g m –2, SD = 24.3), but had risen substantially by summer in each year (mean = 89.5 g m –2, SD ... to the perceived between-year variation in krill density arising from previous summer surveys in the ... consistently over all three years, was detected. Krill densities in winter were predominantly low (mean = 18.7 ... the regression-predicted within-year variation. Years that stand out for markedly low krill density ... et al. 30 summer) in the light of repeated observations of within-year changes to address the ... a ‘low’ or ‘high’ krill year. In general terms, this was around ±35 g m–2 in summer and ±20 g m–2 ... –2, SD = 24.3), but had risen substantially by summer in each year (mean = 89.5 g m–2, SD = 64.2). A ... argued that this is indicative of year-to-year variation in krill density at the island. However, there ...

   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

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

   assessed in this study indicate that, where a stock has been depleted to at or below 20% of the median ... Paper Title:  Evaluating the impact of multi-year research catch limits on overfished toothfish ... populations Abstract / Description:  In stocks that have been depleted by overfishing, the benefit of ... research catches, this study shows that stocks can take decades to recover even in the absence of fishing ... %, 25%, 30% and 35% of SSB0 at the end of the 5-year period. The annual catches taken in each scenario ... year in Division 58.5.2 captured less than 20 tonnes of toothfish in 2009 across 160 hauls (Nowara ... class in stock 1 year Last age class in stock 35 years Oldest age in initial structure 36 years ... structure 1 Years prior to fishing 5 Reference start date in year 1/1 Increments in year 365 Years ...

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

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

   as a result of the imbalance in the number of hauls in the year-by-vessel cross-classification ... . Further, the inclusion of an area stratum by fishing year interaction as an additional random effect in ... distribution, random vessel effects and random stratum-by-year effects Abstract / Description:  The current ... CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... -vessel information as a result of the imbalance in the number of hauls in the year-by-vessel cross ... random effect in the GLMM is investigated. Fitting the stratum-by-year interaction as a fi xed effect is ... a haul. The linear predictor of the GLM incorporates, in addition to YEAR (a categorical factor ... include their in- teractions. The partial regression coeffi cients for YEAR, when added to ‘baseline ...

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

10. Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal distribution and early life history relevant to monitoring year-class strength and recruitment

    distribution and early life history relevant to monitoring year-class strength and recruitment Abstract ... . In winter and summer fish larvae and early juveniles were present over the continental shelf and ... abundant near the coast, but rare in oceanic waters. During winter in the 265 m deep fiord of Cumberland ... East Bay the early stages of many species were found throughout the water column. In summer only four ... length is also given; this includes data from a study in the fiord of CUmberland East Bay during 20 ... abundant in CUmberland East Bay (Figure 20). Pagothenia hansoni larvae of 23-54 mm SL occurred at all ... DISTRIBUTION OF FISH LARVAE IN CUMBERLAND EAST BAY, SOUTH GEORGIA, DURING WINTER, 20 SEPTEMBER TO 5 OCTOBER ... sunset were most abundant in the upper 70 m layer and at 2-150 m depth before dawn (Figure 20). In the ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Auteur(s): North, A.W.

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