Résultats de la recherche

1. Possible effects of different levels of krill fishing on predators – some initial modelling attempts

   krill predator species. A 'one-way' interaction model is developed, in which krill abundance ... 'two-way' interaction model (including also the effect of differing predator consumption ... development of the 'one-way' analyses. File:  06butterworth-thomson.pdf ... suggested by the Joint Meeting of CCAMLR's Working Group on Krill (WG-Krill) and Working Group for the ... one year), while for birds it is the age at first laying. The values of T were taken from the ... each case: y = 0 and two other values, one of which corresponds roughly to depletion of predator ... lues for parameters SF and S? will be discussed in the following section. ONE-WAY INTERACTION ... life-stage. Two parameters of equations ( I ) and (3) remain to be specified: P and S?. Given S ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 79–97 : Auteur(s): Butterworth, D.S. and R.B. Thomson

2. Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in Australian sub-Antarctic trawl fisheries

   from 156 Macrourus carinatus otolith samples collected during two research voyages to Heard and ... Paper Title:  Age, growth and size at sexual maturity of Macrourus carinatus caught as by-catch in ... Australian sub-Antarctic trawl fisheries Abstract / Description:  Estimates of age and growth were obtained ... McDonald Islands (Division 58.5.2) in 1992 and 1993. The range of estimated ages was 4 to 25 years. There ... Ross Sea. 0 100 200 300 400 500 600 700 0 5 10 15 20 25 30 Age (years) To ta l l en gt h ... aged within two years of each other. The bias corrected bootstrap mean IAPE = 4.6% (CI = 3.2–6.0 ... Dorsal Ventral van Wijk et al. 142 0 5 10 15 20 25 30 -500 -400 -300 -200 -100 0 100 200 300 ... within one year. This relatively high level of precision was also indicated by a bias corrected ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 139–151 : Auteur(s): van Wijk, E.M., R. Williams and A.J. Constable

3. Fitting Euphausia superba into Southern Ocean food-web models: a review of data sources and their limitations

   fishery (sustained sampling in one place and wide area and time coverage) and via predators (long time ... , either from individual to schooling krill, or from one region to another. File:  Atkinson-krill.pdf ... occurred year- round throughout Antarctica, and regularly with an estimated ~20% of the stock deeper than ... to be two ‘populations’ of krill, one in the ACC and another in the East Wind Drift, much closer to ... ) method has been in use for 20 years but there have been various attempts to use other analytical ... and Ecosystems CRC University of Tasmania Private Bag 80 Hobart, Tasmania 7001 Australia E ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 219–245 : Auteur(s): A. Atkinson, S. Nicol, S. Kawaguchi, E. Pakhomov, L. Quetin, R. Ross, S. Hill, C. Reiss, V. Siegel, G. Tarling (submitted to the 2008 Joint CCAMLR-IWC Workshop)

4. Seabird mortality in the Patagonian toothfish longline fishery around Crozet and Kerguelen Islands, 2001–2003

   petrels and grey petrels is explained by the time of year, geographical area and type of longliner (manual ... Collection of data The fi shing year extends from 1 September to 31 August. There are two types of ... (Dissostichus eleginoides)). The bird-scaring system consists of one, two or three streamer lines attached at ... one of the vessels taking nearly half of all incidental by-catch. Nearly 80% of incidental by-catch ... the various species is however different from the previous year. Between 70 and 80% of the in ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 53–80 : Auteur(s): Delord, K., N. Gasco, H. Weimerskirch, C. Barbraud and T. Micol

5. Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited

   was one of the first conservation measures adopted by CCAMLR. Fish biomass within a CCAMLR subarea or ... Elephant Island. Catches of the species have been small (<50 kg/ 30 min) with the exception of one or two ... properly in the almost 20 years since the fi shery was closed. Two alternatives to the approach generally ... ). Consequently, biomass estimates obtained for N. rossii have in general been low. Due to one or two large ... ' –61°05' –61°10' –61°15' –61°20' –56°0' –55°30' –55°0' –54°30 ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 141–153 : Auteur(s): Kock, K.-H., M. Belchier and C.D. Jones

6. Results of a longline survey on seamounts in the southeast Atlantic and in Subarea 48.6 and Division 58.4.4

   shallow water. The sex ratio of immature D. eleginoides less than 90 cm total length did not significantly ... vary from 1:1. Females accounted for 70% of individuals of more than 90 cm in total length. The stratum ... ; below this depth, the slope fell away sharply making sampling impractical. Only one set was made ... Banks: n = 136, mean length = 111.8 20 a, 0) m 15 0 a 10 5 0 40 45 50 55 60 65 70 75 80 ... ); and (iii) Ob Bank (52"30'S, 41°30'E) and Lena Bank (53"0OrS, 44'15'E) (Division 58.4.4). A total ... 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Species Dissosticht~s ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 99–116 : Auteur(s): López Abellán, L.J. and J.F. González Jiménez

7. By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992

   the area around South Georgia from May to July 1992. Two species were predominant in the by-catches ... juvenile fish in catches, normalised to one tonne of krill, ranged from 700 to 18 900 individuals. In the ... 30.05 10 240 15.10-16.00 8 000 25 31.05 90 250 09.40-10.15 7 000 2 5 03.06 10 200 16.20-17.20 2 000 20 ... from May to July 1992 in the South Georgia area. P I a a: 80- 40- 4 g 4 G - + - 60- 20- I ... 1992. Two species were predominant in the by-catches: Charnpsocephalus gunnari and Nototheniops ... , normalised to one tonne of krill, ranged from 700 to 18 900 individuals. In the case of C. gunnari, average ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 129–142 : Auteur(s): Pakhomov, E.A. and S.A. Pankratov

8. A balanced model of the food web of the Ross Sea, Antarctica

   recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food web ... older and/or larger it changes from one group to another (dimen- sionless); s ijT seasonal transfer ... average recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food ... through trophic effects, that is, by one species feeding on another (Myers et al., 2007; Daskalov et al ... al., 2007). The aim of the present study is to model an average or typical year, rep- resentative of ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 1–31 : Auteur(s): Pinkerton, M.H., J.M. Bradford-Grieve and S.M. Hanchet

9. Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels

   whales. These two species, alone or in co-occurrence with each other, were observed in 71% of the 1 308 ... two species, alone or in co-occurrence with each other, were observed in 54% of the 6 262 longlines ... sector and marine mammal species. 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 11 12 13 14 15 16 17 ... sperm whales Fishing sector Le ve l o f i nt er ac tio n 90% 80% 70% 60% 50% 40% 30% 20 ... interacting was 8.2 ± 4.7 (n = 552, range 1–20) and 4.1 ± 3.4 (n = 737, range 1–30) individuals respectively ... 3 < 0. 00 1 0. 27 3 0. 00 1 4 2 80 8 44 2 20 9. 1 (1 34 .0 ) 31 6 2 58 1 62 1 ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Auteur(s): Roche, C., C. Guinet, N. Gasco and G. Duhamel

10. Timing of clutch initiation in Pygoscelis penguins on the Antarctic Peninsula: towards an improved understanding of off-peak census correction factors

    two components. One is a model to estimate the date of peak egg laying for a given site in a given ... chinstrap penguins. 0.4 0.6 0.8 1.0 Fr ac tio n of m ax im um c ou nt 0 5 10 15 20 25 30 Days ... since maximum count 0 5 10 15 20 25 30 Days since maximum count 0 5 10 15 20 25 30 Days since maximum ... Days since maximum count 0 5 10 15 20 25 30 0 5 10 ...

    Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 149–165 : Auteur(s): Lynch, H.J., W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece

Pages