Search results
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Fitting Euphausia superba into Southern Ocean food-web models: a review of data sources and their limitations
that the biomass estimate presented here for Area 48 is at the lower end of a wide range of estimates for this area ... , and it is probably nearer the high end of this range. This value is similar to, or slightly larger than ... sources and their limitations Abstract / Description: This paper aims to provide the overview needed to ... include krill in food-web models and to guide modellers to key sources of data. It describes the strengths ... and live krill), acoustics (distribution, time series, biomass and swarm-scale information), the ... recommended. Observations that krill occupy the underice layer, the 0–10 m layer, the deeper water column and ...
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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Preliminary study on nesting Adélie penguins disturbance by unmanned aerial vehicles
- diately before UAV overflight to allow for a reliable comparison. If done a day before or after ... depending on flight purpose and after careful consideration of potential environmental consequences ... Abstract / Description: The importance of unmanned aerial vehicles (UAVs) in remote sensing is rapidly ... , UAV overflights were conducted in the Adelié penguin (Pygoscelis adeliae) breeding colony at Point ... . Thomas (Western Shore of Admiralty Bay, King George Island, Antarctica, Subarea 48.1). The impacts of ... electric and piston engine UAVs flying at 350 m altitude above ground level (AGL) over the colony were ...
Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 1–16 : Author(s): Korczak-Abshire, M., A. Kidawa, A. Zmarz, R. Storvold, S.R. Karlsen, M. Rodzewicz, K. Chwedorzewska and A. Znój
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Small scale krill surveys: simulations based on observed euphausiid distributions
Deviation Method Used in Surveyed Area Krill Density After of Density 10 000 Transects (0') Parallel ... Abstract / Description: An observed distribution of aggregations of the euphausiid, Meganyctiphanes ... norvegica is used to model the effects of krill swarm orientation and shape on the success of two proposed ... survey designs. The simulation involves a number of random paths of parallel or radially arranged ... transects passing through three distributions each of which is given four rotations. The results indicate ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 245–256 : Author(s): Agnew, D.J. and S. Nicol
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Use of indices of predator status and performance in CCAMLR fishery management
obtained, it would probably come so long after the start of the causal problem as seriously to prejudice ... seabird and seal predators,collected as part of the CCAMLR Ecosystem Monitoring Program (CEMP) could be ... used in the management, by CCAMLR, of commercial fisheries. It reviews reasons why it is important for ... CCAMLR formally to use such data in its fishery management operations and discusses the constraints ... inherent in the CEMP data, both from predator monitoring and harvesting perspectives. An outline of a ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 353–365 : Author(s): Croxall, J.P.
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Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey
it is clear that this type of trawl does not have a rope section and the guaranteed catch zone begins ... pattern in this area is shown in Figure 1. After the survey this area was stratified by specific biomass ... variable which depends on both the behavioural and distributional characteristics of the target species and ... midwater trawls and small research trawls, in this case using an Isaacs-Kidd trawl, demonstrated the ... futility of using the latter for trawl census survey biomass assessments due to their highly variable ... catchability over the survey area and also because the biomass estimates thus obtained were characterised by ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Author(s): Kasatkina, S.M.
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Acoustic data analysis and models of krill spatial distribution
: o = 1 03 cm2/sec (appropriate for the basic swarm unit of the order of 10 m in size after Okubo's (1971 ... / Description: Acoustic data obtained on 4-5 January 1987 aboard the R/V Professor Siedlecki were used in three ... (spatial autocorrelation of krill biomass) and the frequency distribution of krill biomass estimate. The ... wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... spectrum appears to lose its power significantly. The semivariance of biomass does not vary significantly ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Author(s): Morin, A., A. Okubo and K. Kawasaki
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?
of standard deviation true mean of females true mean of males apparent mean of females after sexing using ... discriminant analysis can be used to determine the sex of individuals, it is only able to correctly sex a ... difference between the real mean characteristic for a sex, and the apparent mean derived by sexing the birds ... using discriminant analysis. When discriminant functions are able to correctly determine the sex of ... birds with greater than 80% success, the difference between the true and apparent mean is likely to be ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Author(s): Agnew, D.J.
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Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.
in seafloor depth between the start and end- point of the longline set was <200 m. The ratio of hauls ... BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean. Abstract / Description: The distribution, size ... investigated using biological data collected by a Japanese commercial fishing vessel during the austral summer ... shallower banks (<1 000 m), while D. mawsoni was caught on deeper slopes (>1 500 m). Separation of the ... two species by depth may be related to physical intolerance to cooler temperatures because of the lack ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Author(s): Taki, K., M. Kiyota, T. Ichii and T. Iwami
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Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000
conocimiento podría ayudar a entender los mecanismos que infl uyen en la distribución de kril, y por ende, en ... of one cruise (JR38W). After reconstruc- tion in the absence of these data, the MaxEnt- generated points ... survey boxes (dimensions 80 km × 100 km) north of South Georgia. The reconstructions were generated from ... line-transect acoustic survey data gathered in the boxes during austral summers from 1996 to 2000 ... . Krill densities had previously been determined at approximately 0.5 km intervals along each of the ten ... 80 km transects in each box, providing about 1 600 density estimates per box. The MaxEnt technique ...
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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Assessments of by-catch in trawl fisheries at Heard and McDonald Islands
at the end of 20 years of exploitation should be 75% of the pre-exploitation spawning biomass ... in spawning season Coefficient of variation Proportion of median SB, when depletion begins to occur ... / Description: This paper assesses the potential for the commercial trawl fisheries in the Heard Island area ... (Statistical Division 58.5.2) to significantly affect, in the long term, spawning biomass of three taxa caught ... skates). The long-term annual yield for each of the three taxa was estimated using the generalised yield ... model (GYM) used by the CCAMLR Working Group on Fish Stock Assessment (WG-FSA). Input data included ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 231–243 : Author(s): Constable, A.J., R. Williams and W.K. de la Mare