Результаты поиска

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

   Paper Title:  Results of a longline survey on seamounts in the southeast Atlantic and in Subarea ... October and 1 December 1997, and several seamounts were surveyed to the south of Africa: close to the ... of Bouvet Island, Ob and Lena Banks). Samples were collected from longlines set perpendicularly to ... toothfish (Dissostichus eleginoides), with 2 822 individuals caught (83% of total catch). Grenadiers of the ... m. The number of longline sets at each seamount was determined by seabed topography, and at least ... two sections of the slope around each seamount were sampled. Longlines were set at night, and soak ... -Smirnov test for large samples. The critical values were obtained at the 0.05 level of significance ... catches of D. eleginoides and Macrourus spp. At the same time, differences were observed in the density ...

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

2. An index of per capita recruitment

   Paper Title:  An index of per capita recruitment Abstract / Description:  An index of per capita ... recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... is the post-recruit mortality rate. The intent of the index is to facilitate investigation of ... reproductive success and the factors postulated to affect it. The formulation of PCR is based on the ... , 1 000 values were drawn at random and PCR calculated for several levels of M. When R1 followed a ... growth. Small changes in the assumed value of M, particularly at high levels, will not greatly affect ... the value of PCR over the normal range of RI. The effect will become greater, however, at very high ... mortality (M) of krill was between 0.88 and 0.96 from catch-at-age data. Priddle et al. (1988) estimated M ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Автор(ы): Hewitt, R

3. A fine-scale model of the overlap between penguin foraging demands and the krill fishery in the South Shetland Islands and Antarctic Peninsula

   Paper Title:  A fine-scale model of the overlap between penguin foraging demands and the krill ... using the total catch of krill taken within 100 km of penguin colonies in their breeding season ... (December to March) as an index of overlap between the potential foraging areas of penguins and the ... distribution of the krill fishery in Subarea 48.1 (South Shetland Islands). As this index has proven unsuitable ... distances of 11 to 24 km at bearings between 330" and 033" for chinstrap penguins, and 20 to 40 km at ... to be foraging within the minor unit at any time was determined as where P, is the total number of ... pairs in colony t of colonies (only one bird from a pair is assumed to be foraging at any one time ... unit and z is the area of the arc of angle theta which contains the M, defined as being at distances ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 99–110 : Автор(ы): Agnew, D.J. and G. Phegan

4. Performance and geometry of the FP-120 trawl used during UK fish stock assessment surveys around South Georgia, Subarea 48.3

   Paper Title:  Performance and geometry of the FP-120 trawl used during UK fish stock assessment ... opening (and, thus, swept area) of a bottom trawl are discussed. In situ measurements of the FP-120 trawl ... presented. Regression equations for the estimation of horizontal opening from other, more easily measured ... around South Georgia are estimated using a new regression equation. The results of this calculation are ... , swept area S can be estimated at the ith location by: start and end of each tow using a Furuno GPS ... mounted at the midpoint of the headline. Additional floats were attached to counteract the negative ... fixing of the Scanmar sensors on the FP-120. Pilling and Parkes The sensors were deployed at 29 of ... measurements of the horizontal opening resulted. The mountings of the sensors were checked at the end of each ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 51–69 : Автор(ы): Pilling, G. and G. Parkes

5. The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a simulation model

   Paper Title:  The choice of procedure for deciding when to close fisheries regulated by CCAMLR: a ... deciding the closure date for fisheries monitored by the Secretariat of CCAMLR, have been difficult to ... implement because of the variation in catch rates shown by the fisheries. Non-fluctuating random and ... fluctuating random catch histories are simulated and the performance of four models for making closure ... falling due at the end of the period following that in which catches are taken; • the Secretariat should ... further the performance of various methods of arriving at a closure decision and to develop methods with ... amplitude of the sin wave, 9 is the position of the sinusoidal cycle at time t computed from the equation 9 ... the report at the Secretariat in days, P = length of the reporting period in days, a = mean delay, s ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 81–97 : Автор(ы): Agnew, D.J.

6. Effect of line sink rate on albatross mortality in the Patagonian toothfish longline fishery

   Paper Title:  Effect of line sink rate on albatross mortality in the Patagonian toothfish longline ... vessels to derive a sink rate and line-weighting regime that would minimise the capture of albatrosses ... based on knowledge of line sink rates and albatross diving abilities. Sink rates of lines deployed into ... propeller turbulence, which tended to keep lines aloft, varied as a function of distance between line ... results of experiments are to be meaningful. This is particularly so in the case of experiments aimed at ... a line length on the seabed of about 13 km (depending on slack in the line). The line was set at ... at 5.5-6.5 knots and bait shooting rate, which varies as a function of setting speed and snood ... within 70 m of weights attached to the mother line at 1 600 m intervals. Branch lines were 18 m in ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 133–150 : Автор(ы): Robertson, G.G

7. Investigations of required sampling regimes for environmental parameters

   Paper Title:  Investigations of required sampling regimes for environmental parameters Abstract ... / Description:  The sensitivity of different sampling regimes in identifying inter-annual changes in ... monthly mean temperature over two years with a significance α of 0.05 and a power P of 0.8. Sampling wind ... monthly mean log-transformed wind speed α of 0.05 and P of 0.9. File:  35-Agnew.pdf ... of the required sample size such that a certain level of change would be detectable at a ... significance level of a and at a power of P. The method of Sokal and Rohlf (1981) was used along the ... . The occurrence of cyclic phenomena at Davis Station, including the suspected occurrence of cycles in ... temperature change of ±2°C in December and January could be reliably detected at Davis Station, but that in ...

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

8. Calibration of an acoustic echo-integration system in a deep tank, with system gain comparisons over standard sphere material, water temperature and time

   Paper Title:  Calibration of an acoustic echo-integration system in a deep tank, with system gain ... sphere. It presents the results of an extensive calibration of a Simrad EK500 scientific echosounder with ... gain, including the effects of temperature, standard sphere and time, is 2.9 dB. Gain values calibrated ... with the Cu sphere are, with the exception of the long pulse length, lower than those from the WC ... each pair of transducer leads. Transducer resistances should be measured at all accessible points ... . Although the impedence of transducers is usually tuned in the factory to be 60 n at the nominal operating ... with three nylon cords in the centre of the tank at a depth of 0.5 m. It was connected to the EK500 ... ° alongship and athwartship angles, and at 0.5° C (Figure 2). By maintaining near zero offset (±1°) in one of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 127–144 : Автор(ы): Demer, D.A. and R.P. Hewitt

9. Protecting young fish and spawning aggregations of Champsocephalus gunnari in Subarea 48.3 (South Georgia): a review

   Paper Title:  Protecting young fish and spawning aggregations of Champsocephalus gunnari in ... measures put in place by CCAMLR to date. These measures are re-examined in the light of new information ... , and a strategy for the future protection of young fish and spawning aggregations of C. gunnari in ... Subarea 48.3 is considered. This comprises a combination of existing measures, including minimum mesh size ... of C. gunnari from 2-3 years old to 3-4 years old, particularly at high fishing mortalities ... (greater than 0.6). Relative benefits at low fishing mortalities (in the region of 0.2) were much less ... and Minimum Size Limits One of the most commonly used approaches to increasing the age at first ... setting of closed seasons if they are more vulnerable to capture at certain times of the year. In ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 75–86 : Автор(ы): Parkes, G.B

10. Research currently being undertaken by the Republic of South Africa on "dependent and related species" within the Antarctic marine ecosystem

    Paper Title:  Research currently being undertaken by the Republic of South Africa on " ... components of the biological sciences programme are described. The primary objective of the studies being ... undertaken is to improve our understanding of the ecology of important predators (especially seals and ... nearllal 93 Per (;ent of the world '5tock of this spec [es, hat; be~Jn est imwted at 200 000 and is ... increasing at a r;3t,(,! of about 16 Per cent Per i:iear. Distribution of these seals ar-mmd the shore of ... durins 1!J73 and indicate a decrease of 5 to 11 Per cent Per !:lear in the flOPulations at Mari on (4 ... acti1,1ities of elephant .an,j fur -.;eats i.,hen ashore at Mar-ion Island to breed or moult ha1,1e an imPor ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 59-77 : Автор(ы): South Africa

Страницы