Search results
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A potential feedback approach to ecosystem-based management: Model Predictive Control of the Antarctic krill fishery
; to illustrate the elements of feed- back control strategies, and the issues that must be addressed ... on the simplified formulation of Constable’s (2001) multi-species model in Hill et al. (2006). It is modified ... the equations of Constable (2001), and harvesting and movement are represented with additive loss or gain ... - ables in each area (Constable, 2001): ( )2, ~ , ii k i KKK σ . (4) The sequences of random variables ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 119–137 : Author(s): Hill, S.L. and M. Cannon
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Krill fishing in the Scotia Sea in relation to bathymetry, including the detailed distribution around South Georgia
variability in the distribution of trawls. The data for 1993 were only available from August but the fishery ... to the ecology of krill and the fishery's interaction with local predator colonies. File: 01murphy-etal.pdf ... of trawls. The data for 1993 were only available from August but the fishery was restricted in that period ... of krill and the fishery's interaction with local predator colonies. ... interannual variability in the distribution of trawls. The data for 1993 were only available from August ... . The results are discussed in relation to the ecology of krill and the fishery's interaction with local ... sont discutes en fonction de l'ecologie du krill et de l'interaction de la pGcherie et des colonies de ... interactions between the environment and krill. Such studies, however, are usually geographically limited ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 1–17 : Author(s): Murphy, E.J., P.N. Trathan, I. Everson, G. Parkes and F.H.J. Daunt
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A quantified Bayesian Maximum Entropy estimate of Antarctic krill abundance across the Scotia Sea and in small-scale management units from the CCAMLR-2000 Survey
of Area 48 (CCAMLR-2000 Survey) (Trathan et al., 2001; Hewitt et al., 2004a) of the Scotia Sea employed ... (Skilling, 1988a; Skilling and Gull, 1989; Skilling Table 1: List of SSMU designations. SSMU Number Full ... to note, when looking at the bio- mass and standard deviation values, that issues of calibration, target ... 1 and listed in Table 1. However, substantial parts of regions 1, 2, 8, 9, 13 and 16 lie outside the survey ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 97–116 : Author(s): Heywood, B.G., A.S. Brierley and S.F. Gull
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Fitting Euphausia superba into Southern Ocean food-web models: a review of data sources and their limitations
in, or transiting, these deep waters to or from the seabed. The issue of undersampled krill has fundamen- tal ... been reviewed by Watkins (2000). They identified issues such as accuracy of estimates of krill ... been a controversial issue because of the potential for net mesh selection and avoid- ance of the net ... to specific species, and then to scale it to provide a biomass estimate. This is a technical issue ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 219–245 : Author(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)
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Commercial krill fisheries in the Antarctic, 1973 to 1988
to August). Trends in the fishery with respect to independent estimates of krill abundance and minke whale ... (April to August). Trends in the fishery with respect to independent estimates of krill abundance ... where fishing is predominantly confined to the winter months (April to August). Trends in the fishery ... the whole year round, the highest catch levels occur between April and August (Le. in late autumn through ... step in determining the effects of possible interactions between krill and other species requires ... definition of the temporal and spatial scales over which such interactions occur. An important consequence ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 229–281 : Author(s): Miller, D.G.M.
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Quantification of Southern Ocean phytoplankton biomass and primary productivity via satellite observations and biogeochemical models (submitted to the 2008 Joint CCAMLR-IWC Workshop)
and precursor to primary productivity. Table 1 lists some of the properties of specific ocean colour sensors ... CZCS 4 October 1978 to June 1986 pigment 61%, n = 15 OCTS 9 August 1996 to July 1997 chlorophyll-a 21 ... of photosynthesis, including bet- ter understanding of the effect of temperature. In an attempt to avoid the issues ... pigment data to account for the known issue of underestimation (Sullivan et al., 1993). Annual Southern ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 247–265 : Author(s): P.G. Strutton, N.S. Lovenduski, M. Mongin and R. Matear
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A first step towards modelling the krill–predator dynamics of the Antarctic ecosystem
. The objective of the study is to determine whether predator–prey interactions alone can broadly explain observed ... are that: (i) species interaction effects alone can explain observed predator abundance trends, though not without some ... is to determine whether predator–prey interactions alone can broadly explain observed population trends ... further areas for investigation. Amongst the key inferences of the study are that: (i) species interaction ... . The objective of the study is to determine whether predator–prey interactions alone can broadly explain ... are that: (i) species interaction effects alone can explain observed predator abundance trends, though not without some ... , les interactions prédateurs–proies peuvent expliquer les tendances des populations observées sans que ... : i) les effets de l’interaction des espèces peuvent suffire à expliquer les tendances observées, mais ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 217–277 : Author(s): Mori, M. and D.S. Butterworth
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Sea-surface temperature and krill catches around South Georgia in December–February 1989–1991 and 1999–2001
1989–1991 and 1999–2001 Abstract / Description: Monitoring of sea-surface temperatures (SSTs ... to 39 766 tonnes in 2000/01. The SST maps for 1999–2001 showed a prominent advection of Weddell Sea ... and 1999–2001 ... to 39 766 tonnes in 2000/01. The SST maps for 1999–2001 showed a prominent advection of Weddell ... 1999–2001. Liste des fi gures Figure 1: SST moyenne mensuelle de janvier 2001 (l’emplacement des ... –FEBRUARY 1989–1991 AND 1999–2001 G.P. Vanyushin VNIRO, 17a V. Krasnoselskaya Moscow 107140, Russia Email ... . However, it dropped to 39 766 tonnes in 2000/01. The SST maps for 1999–2001 showed a prominent ... est tombée à 39 766 tonnes en SHORT NOTE Vanyushin 166 2000/01. Les cartes de SST de 1999–2001 ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 165–174 : Author(s): Vanyushin, G.P
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Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000
influencing krill distribution, and hence krill/predator interactions. The MaxEnt technique also yields mean ... the understanding of mechanisms influencing krill distribution, and hence krill/predator interactions. The MaxEnt ... , and hence krill/predator interactions. The MaxEnt technique also yields mean krill densities for each ... , les interactions krill/prédateurs. La technique de MaxEnt fournit de plus, pour chaque campagne, des ... providing more information on spatial relationships between swarms (Kalikhman, 2001). Halving ... . J. Fish. Aquat. Sci., 47: 1282–1291. Kalikhman, I. 2001. Patchy distribution fi elds: sampling ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Author(s): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins
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Seabird interactions with longlining operations for Dissostichus eleginoides around South Georgia, April to May 1994
Paper Title: Seabird interactions with longlining operations for Dissostichus eleginoides around ... eleginoides off South Georgia were assessed for incidental mortality and interactions with seabirds. Twenty ... birds/1 000 hooks. Mortality and interactions of birds with operations varied with site and time of day ... , and was affected by behavioural interactions between birds. Setting only at night would dramatically reduce ... INTERACTIONS WITH LONGLINING OPERATIONS FOR DISSOSTZCHUS ELEGINOIDES AROUND SOUTH GEORGIA, APRIL TO MAY 1994 ... for incidental mortality and interactions with seabirds. Twenty-seven line sets were observed and 98 deaths ... hooks. Mortality and interact~ons of birds with operations varied with site and time of day ... , and was affected by behavioural interactions between birds. Setting only at night would dramatically reduce ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 111–121 : Author(s): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno