Результаты поиска

1. The sensitivity of multiple output statistics to input parameters in a krill–predator–fishery ecosystem dynamics model

   strategic frameworks for assessing uncertainty in ecosystem dynamics models. Such models have been used ... within CCAMLR to evaluate options for managing the Antarctic krill fishery in the Scotia Sea and southern ... Drake Passage. The model analysed here required 2 311 input values for each of four scenarios and ... recruitment through pre-recruit mortality. A parameter mediating the effect of a forcing function on krill ... provide advice to CCAMLR on the spatial allocation of the Antarctic krill catch limit for the Scotia Sea ... , including one each for krill (productivity) and fishery performance (services) and two (health and ... described in Hill et al. (2007a, 2007b), as an example of good practice for addressing sev- eral types of ... model outputs, and provides an objective basis for targeting data collection and modelling effort to ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 97–118 : Автор(ы): Hill, S.L. and J. Matthews

2. Scientific observations in CCAMLR fisheries – past, present and future

   observers on board fishing vessels has assumed prominence in the collection of essential data for fisheries ... / Description:  CCAMLR has the primary competency for managing fishing south of the Antarctic Polar Front ... strategy has often had to deal with incomplete and uncertain information on affected resources. Fishery ... designed to gather and validate fishery-related information essential for assessing the status of target ... information essential for assessing the status of target species as well as the impact of fi shing on ... principles outlined in Article II of the CAMLR Convention (CCAMLR, 2004a, Part 1) embody an ‘ecosystem’ and ... scientifi c observers for compliance assessment purposes. These include data collected on the ... observ ers (i.e. an observer designated by one Member serves on a vessel fl ying the fl ag of another ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 81–98 : Автор(ы): Sabourenkov, E.N. and E. Appleyard

3. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   occupies. There was one aggregation area of Lepidonotothen squamifrons on an outlying bank during two ... Island and the McDonald Islands, an Australian Territory around which a 200-mile EEZ has been declared ... . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... data for its  management, three random stratified surveys were conducted to investigate the ... aggregation area of Lepidonotothen squarnifrans on an outlying bank during two surveys, but this had ... following changes were Each haul was for 30 minutes duration on the made with respect to summer 1992 ... during the two cruises on which it was sampled. Length frequencies for the three cruises (Figure 4 ... the results from these two strata in autumn 1990; * the minimum number of trawls on Discovery ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Автор(ы): Williams, R. and W.K. de la Mare

4. Modelling variability and estimating power to detect change in Adélie penguin fledgling weights

   year, but there was no evidence that the rate of decline differed between years. A consequence of this ... weight data were used to examine the power to detect a change in fledgling weights after an impact. The ... or decrease after an impact. Fledgling weight was found to decline through the fledging period each ... work is identified to investigate this possibility. Modelling also indicated the potential for reducing ... collected on fledgling weights on date x for samples of n fledglings per year (1) in each of r years prior ... than 30 birds each year. This is the case for both one- and two-tailed tests with a power greater ... birds, or (c) 30 birds each year. Change detected for three to five years of monitoring after change ... to an impact, and (2) for c years after the impact, in circumstances where the impact results in a ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 191–200 : Автор(ы): Emmerson, L.M., C. Southwell and J. Clarke

5. Analysis of the diet of Champsocephalus gunnari at South Georgia in late summer from 1994 to 1997, Dr Eduardo L. Holmberg surveys

   two species in the diet of C. gunnari was reversed. The consumption of other prey items such as mysids ... and Thysanoessa sp., which are known to be important alternative food in years of krill scarcity, as ... length of C. gunnari did not reveal any selectivity pattern for any of the prey items. The availability ... years of krill scarcity), intermediate in 1995 (below years of historically high abundance), and high in ... together with relevant observations on the reproductive condition of C. gunnari from South Georgia ... frozen at -30°C and later examined at the Instituto Antiirtico Argentino. For the aim of this study ... definite spatial pattern, except for an apparent higher concentration of krill in the southeastern part ... preyed intensively on C. gunnari (TL = 12-20 cm) and, secondarily, on krill. C. gunnari of the same ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 103–123 : Автор(ы): Barrera-Oro, E., R. Casaux and E. Marschoff

6. Discrimination of Macrourus whitsoni and M. caml (Gadiformes, Macrouridae) using otolith morphometrics

   otoliths of the two species was sought. Based on 220 M. whitsoni and 307 M. caml otoliths, a linear ... fishery in the Ross Sea region is comprised of two species, rather than being solely Macrourus whitsoni ... the abundance of toothfish reduces. In order to improve information on the spatial distribution, age ... excellent discrimination between the two species (92% success). A method was also developed to discriminate ... 80 60 40 20 0 10 20 30 40 50 60 70 Age (years ... , especially on the Ross Sea slope where fishing for toothfish is most intense (Pinkerton et al., 2010 ... Pinkerton et al. (2013) based on fish collected in 2008. The recent recognition that there are two main ... parameters are also presented. Pinkerton et al. 16 fishery on these species. For example, there is ...

   Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 15–28 : Автор(ы): Pinkerton, M.H., C. Ó Maolagáin, J. Forman and P. Marriott

7. Feeding patterns of nine species of Antarctic fish and assessment of their daily food consumption

   fish species in Antarctic waters. The aim of this study is to collect information on the feeding ... : Nototheniidae (four species), Channichthyidae (three species) and Bathydraconidae (two species). The study ... concentrated on analysing the food composition of these species to find out their daily diet. One 36-hour ... food; (ii) Trematomus centronotus- a benthophage feeding mainly on amphipods, mobile and sedentary ... ), Channichthyidae (three species) and Bathydraconidae (two species). The study concentrated on analysing the food ... time of T90 (evacuation time): (3) Evacuation time is from two to five days for Antarctic fish ... respectively. Daily food consumption for each fish species was calculated for two values of T90: 48 and 72 ... benthophages is no less than two or three days, while for predatory and euryphages digestion takes no less ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 321–333 : Автор(ы): Pakhomov, Y.A. and V.B. Tseitlin

8. 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 ... their numbers never exceeded 10. Only once, on 30 December 1988, when the vessel was sailing across an ... 73°30'S in the Pacific sector. Most often single birds were observed and it was rare for two to be ... . So far a great deal of information has been gathered together on bird behaviour, distribution and ... . Two or three specimens would follow in the ship's wake which enabled them to feed on cryoplankton ...

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

9. Significant intra-annual variability in krill distribution and abundance at South Georgia revealed by multiple acoustic surveys during 2000/01

   designed to complement and extend an existing time series regularly maintained by the British Antarctic ... Survey since 1996 (and on a more ad hoc basis since the early 1980s). We hoped that conducting several ... surveys in one season would provide information on short-term variability that could be used to set data ... southwest of the island. Together these surveys provided temporally and spatially extensive coverage around ... to this, but on a more ad hoc basis (see Brierley et al., 1999 for a summary of all surveys). In ... - logical and oceanographic datasets), a new series of surveys was planned for the fi ve years 2000/01 to ... target strength (TS) for each survey area was calculated in dB kg-1 (see Brierley and Watkins, 1996) on ... describing intra-annual abundance variability. These surveys together will also provide valuable data for ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 71–82 : Автор(ы): Brierley, A.S., C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst

10. A potential feedback approach to ecosystem-based management: Model Predictive Control of the Antarctic krill fishery

    Control (MPC) to achieve objectives for a harvested species, its predators and the fishery, in a ... also useful for assessing the feasibility of candidate management policies or objectives, and ... area‐specific carrying capacity for these two areas, and the influx of the harvested species from the ... source of the harvested species for the remaining two areas. The biomass dynamics of the harvested ... based on the decision rule for the krill stock suggested by Butterworth et al. (1991) and later ... probability, Xp . The constraints imposed by the limits on uk and Δuk specify an allowable range and ...

    Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 119–137 : Автор(ы): Hill, S.L. and M. Cannon

Страницы