Résultats de la recherche

1. Observation of seabirds in the Southern Ocean in 1988/89

   :00; 12:00, 16:00 and 20:00 ship-time, while sailing between Antarctic stations and while en route to ... Southern Ocean to the south of 60°S. Thirty minute observations were made daily during daylight hours at 8 ... 73°30'S in the Pacific sector. Most often single birds were observed and it was rare for two to be ... part of the Mawson Sea (61°S, 108°W). In the Paciftc sector only small numbers (one or two) of birds ... (72°34'S, 173°W). A repeated survey of the Indian Ocean sector in autumn revealed that one or two ... exceed one or two. A slight increase of wandering albatrosses to the north was observed in the autumn ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 521–542 : Auteur(s): Vagin, A.V. and V.V. Popov

2. A study of Patagonian toothfish (Dissostichus eleginoides) post-tagging survivorship in Subarea 48.3

   . Toothfish were kept in tanks with seawater replacement for at least 12 hours after tagging. On one vessel ... , 396 animals were included, with an overall survivorship of 90%. Smaller animals and animals in better ... -tagging survivorship of 95% or more. An assumption of 90% post-tagging survivorship is a conservative ... oo d 2a ve ra ge 3p oo r fish.length.cm s( fis h. le ng th .c m ) 60 70 80 90 100 -5 0 ... 5 days.after.1.June s( da ys .a fte r. 1. Ju ne ) 0 20 40 60 80 -2 -1 0 1 2 3 4 ... ( fis h. le ng th .c m ) 60 70 80 90 100 -5 0 5 days.after.1.June s( da ys .a fte r. 1. Ju ... ne ) 0 20 40 60 80 -2 -1 0 1 2 3 4 fishing.depth.m s( fis hi ng .d ep th .m ) 600 800 ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 279–289 : Auteur(s): Agnew, D.J., J. Moir Clark, P.A. McCarthy, M. Unwin, M. Ward, L. Jones, G. Breedt, S. Du Plessis, J. Van Heerdon and G. Moreno

3. A simple approach for calculating the potential yield of krill from biomass survey results

   median pre-exploitation level over a 20 year period of harvesting should equal 10%. The value of, λ ... for the calculations is that the probability that the krill spawning biomass drops below 20% of its ... -exploitation level over a 20 year period of harvesting should equal 10%. The value of 'A, depends strongly on ... size drops below 20% of its average value prior to exploitation, over a 20 year period of harvesting ... -lived animal. If this is correct, one would not expect a value of M that is very high (or too few krill ... 0.2 occurs during the 20 year harvesting period. (x) Repeat steps (ii» to (ix) for different values ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 207–217 : Auteur(s): Butterworth, D.S., A.E. Punt and M. Basson

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

   fewer local trips and both sexes spent longer at sea than in years of higher breeding success. Meal ... seven days during mid-January each year at longitude 60°E. Chick Growth (CEMP A7) About 30 chicks ... Season year is shown in Table 1. We found a negative (Kruskal-Wallis One-way ANOVA on Ranks ... years. Two other years, 1994/95 and 1995/96, also experienced low breeding success rates of 0.05 and ... significantly greater in 1998/99 than in two of the years with higher breeding success (p < 0.05), and the ...

   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

5. Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana) from the Ross Sea

   been generated that suggest much slower growth, greater ages-at-maturity (about 20 years compared with ... Paper Title:  Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana ... ) from the Ross Sea Abstract / Description:  A previous study on the age and growth of Amblyraja ... georgiana in the Ross Sea suggested that these skates initially grow very rapidly for about five years ... underestimated Estimated age (years) 0 10 20 30 40 P el vi c le ng th (c m ) 0 20 40 60 80 100 ... skates having large discrepancies between the two readers. 10 20 30 R ea de r 2 , r ea di ng 4 ... 20 30 40 P el vi c le ng th (c m ) 0 20 40 60 80 Reader 1 (N = 216) Reader 2 (N = 98 ... aged up to about 20 years (Figure 2). However, beyond 20 years, reader 1 consistently aged skates ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 211–220 : Auteur(s): Francis, M.P. and M.J. Gallagher

6. Fishing intensity of the Soviet fleet in krill fisheries in the southern Atlantic (Subareas 48.2 and 48.3)

   20-year fi shing history, the precautionary catch limit had never been approached. Furthermore, the ... 300000 Years Subarea 48.3 Years C at ch (t on ne s) 19 86 /8 7 19 88 /8 9 19 90 /9 1 19 92 ... greatest recorded fi shing intensity. During the two most recent decades, such years occurred in the 1987 ... 90 /9 1 92 /9 3 94 /9 5 96 /9 7 98 /9 9 Years C at ch ( to nn es ) Subarea 48.1 0 ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 15–35 : Auteur(s): Kasatkina, S.M. and V.F. Ivanova

7. Is current management of the Antarctic krill fishery in the Atlantic sector of the Southern Ocean precautionary?

   conservatively estimated subarea biomass in up to 20% of years due to high variability in krill biomass indices ... 1991, is 0.62 million tonnes year –1, equivalent to ~1% of the regional biomass estimated in 2000. Each ... subarea has also had its own catch limit, between 0.093 and 0.279 million tonnes year –1, since 2009 ... recent years. This suggests that fishing at the trigger level would be equivalent to a long-term ... stock biomass falling below 75% and 20% of the reference level) and one of the ‘acceptable limits’ on ... catch limits exceed 9.3% of conservatively estimated subarea biomass in up to 20% of years due to high ... biomass (i.e. the total weight of reproductively mature individuals) after 20 years of fishing should ... of 32 years for the sector 10°E to 90°W (Atkinson et al., 2014). It is unclear how the observed ...

   Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 31–51 : Auteur(s): Hill, S.L., A. Atkinson, C. Darby, S. Fielding, B.A. Krafft, O.R. Godø, G. Skaret, P.N. Trathan and J.L. Watkins

8. An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island

   the Heard Plateau is 275 mm. The growth curve gives a mean length for fish aged one year less than ... years from the two abundant cohorts of 1 500 tonnes, comprising 900 tonnes in the first year and 600 ... respectively. The effects of a constant catch level (in tonnes) over a 20-year period were evaluated. The ... , which means that they are based on a constant catch over a 20-year period, and as such they can be ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 79–101 : Auteur(s): de la Mare, W.K., R. Williams and A.J. Constable

9. Seabird interactions with longlining operations for Dissostichus eleginoides at the South Sandwich Islands and South Georgia

   mortality was seen and only one bird was caught on a hook; nevertheless many species in these aggregations ... . Alternatively, other configurations of streamer lines might be easier to accommodate, e.g. two lines, one to ... Peninsula, islands of the Scotia Sea and Antarctic continent between 80°W and 20°W: their status and ... operations. No incidental mortality was seen and only one bird was caught on a hook; nevertheless many ... saving of $A4.9 million and 30 300 albatrosses annually. The Japanese tuna fishery is in the process ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 143–153 : Auteur(s): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno

10. On the power to detect changes using the standard methods for monitoring parameters of predatory species

    next year. Thus, each sample of birds is said to be "nested" within years when two or more years are ... ~--------------------------------------------~ 120 -t/l ... ::J 100 0 .s=. - :c I- 80 CJ Z W ...J a. 60 a: I I- 40 20 ... ) to compute the requisite sample sizes for detecting changes of 10%, 20% and 30% of the mean value ... sample sizes for detecting changes of 10%, 20% and 30% of the mean values are shown in Table 2. No ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Auteur(s): Boveng, P. and J.L. Bengtson

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