Resultados de la búsqueda
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Archival and satellite-linked data recorders
behaviour. The records can be recovered in one of two ways: the data recorder must either be recovered ... intact, or the data recorder must be capable of disseminating its data via a radio link, such as the ... . Raw-data recorders keep a complete record of the diving parameters of interest and thus produce ... . Due to the limited data-handling capacity of the ARGOS satellite system, most satellite-linked ... makes the smallest complete instrument measure approximately 100mm by 100mm by 35mm after allowing ... optical diffuser on a stalk extending from one end of the unit. Temperature is measured at the end of ... animals and gather data on aspects of an animal's diving behaviour. The records can be recovered in one ... of two ways: the data recorder must either be recovered intact, or the data recorder must be ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 475-493 : Autor(es): Hill, R.D.
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Telemetry monitoring of ecological resources
monitoring using the Argos/Tiros system and satellite transmission of data are also covered. File: 24 ... closure. If the animal is not active the clock will not be reset and the clock sends an output after a ... enclosed within the package, usually as a helix at one end, or a whip external to the main transmitter ... hydrophone and a narrow band receiver which separates the signal from the noise. After the signal is ... recording using microprocessors with semiconductor memory. Satellite monitoring using the Argos/Tiros ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 495-511 : Autor(es): Kuechle, V.B.
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Possible effects of different levels of krill fishing on predators – some initial modelling attempts
modelling attempts Abstract / Description: An initial attempt is made to develop the modelling framework ... suggested by the Joint Meeting of CCAMLR's Working Group on Krill (WG-Krill) and Working Group for the ... CCAMLR Ecosystem Monitoring Program (WG-CEMP) in 1992, in order to investigate the possible effects of ... krill fishing on krill predators. First, estimates are made of the parameters of predator survival rates ... . one realised after any transient effects from the commencement of fishing at an intensity y have ... provided by CCAMLR (1993) (but see further discussion at the end of this sub-section). The final ... . Thus, the assumption being made is that the distribution of NIK, will have stabilised after 200 years ... medians of the distributions of N after 200 years of a constant annual catch of krill (this catch is ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 79–97 : Autor(es): Butterworth, D.S. and R.B. Thomson
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Survey design to estimate krill abundance during FIBEX
of the primary aims of FIBEX (First International BIOMASS Experiment), 1981 was to study the ... methodology for assessing the abundance of krill. The survey design used in the southwest Atlantic study area ... of the FIBEX is described in this paper. Sampling involved the use of echo sounders for estimating ... krill abundance as well as collection of data on the size, density and distribution of krill swarms. In ... survey subarea at the end of the primary phase (after BIOMASS 1980b). Phase 2 transects would be run ... ABUNDANCE DURING FIBEX I. Everson, I. Hampton, G.M. Jolly Abstract One of the primary aims of FIBEX ... (First International BIOMASS Experiment), 1981 was to study the methodology for assessing the abundance ... of krill. The survey design used in the southwest Atlantic study area of the FIBEX is described in ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 253–263 : Autor(es): Everson, I., I. Hampton and G.M. Jolly
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Antarctic krill and ecosystem management – from Seattle to Siena
/ Description: This paper outlines CCAMLR’s development of a management approach for the Antarctic krill ... (Euphausia superba) fishery and associated ecosystem component between 1984 and 1995. The approach is shown ... to be consistent with the objectives of the CAMLR Convention, particularly its Article II. Emphasis ... is given to the initiation of the CCAMLR Ecosystem Monitoring Program (CEMP) and the deliberations of ... krill fl ux (i.e. movement). A year after initiat- ing the above, CCAMLR adopted its fi rst krill ... some smaller areas (SC-CAMLR, 1992 onwards). Sea-Ice After water circulation, the environmental ... outlines CCAMLR’s development of a management approach for the Antarctic krill (Euphausia superba) fi ... shery and associated ecosystem component between 1984 and 1995. The approach is shown to be consistent ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 175–212 : Autor(es): Miller, D.G.M
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Sensitivity analysis for parameters of predatory species CCAMLR Ecosystem Monitoring Program
Program Abstract / Description: Following the request of the Scientific Committee of CCAMLR to conduct ... such a treatment of data obtained at the Magnetic Island Adélie penguin colony in Prydz Bay in the 1987 ... /88 and 1988/89 breeding seasons. The data on the following parameters were analyzed: adult weight on ... was only effective until the end of the guard-stage, after which time both parents began to feed ... PREDATORY SPECIES CCAMLR ECOSYSTEM MONITORING PROGRAM M.D. Whitehead Abstract Following the request ... of the Scientific Committee of CCAMLR to conduct sensitivity analyses on existing data regarding ... predator breeding biology parameters, this report presents such a treatment of data obtained at the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 411–432 : Autor(es): Whitehead, M.D.
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Food consumption by predators in a CCAMLR integrated study region
/ Description: A detailed description of the structure and mode of operation of a model for estimating food ... consumption of seabird predators is provided. This model is a development of earlier ones used in the South ... provided, illustrating the changes produced by using these new sub-models. Results of initial sensitivity ... analyses indicate particular sensitivity to estimation of metabolic energy requirements. The system is ... the foraging effort at the inshore end of the range is 10 times that for uniform foragers and ... after the periods ashore. This would allow data lines 05, 06 and 08 to be completed and require 07 to ... detailed description of the structure and mode of operation of a model for estimating food consumption of ... seabird predators is provided. This model is a development of earlier ones used in the South Georgia ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 489–519 : Autor(es): Croxall, J.P., C. Ricketts and A.G. Wood
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Fish stock assessment survey in Subarea 48.3
fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described. Details are given of ... positions of hauls, catch rates and size composition of catches. The standing stock of one of the most ... important commercial species in the area, Champsocephalus gunnari, is shown to have undergone a major ... decline by comparison with results from the 1989/90 season. Other species do not show a similar dramatic ... the end of the survey and the results set out in Table 3. Field trials undertaken by the Sea ... . The two largest catches, one of 696 kg at Shag Rocks and the other of 336 kg from the eastern end of ... trawler Lepus was operating in the area and reported catch rates of less than one tonne per day; after ... Abstract A demersal fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 25–67 : Autor(es): Everson, I., G. Parkes, K.-H. Kock, S. Campbell, Z. Cielniaszek and J. Szlakowski
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Discrimination of Macrourus whitsoni and M. caml (Gadiformes, Macrouridae) using otolith morphometrics
otolith morphometrics Abstract / Description: That the predominant by-catch of grenadier by the toothfish ... fishery in the Ross Sea region is comprised of two species, rather than being solely Macrourus whitsoni ... , was recognised in 2010 with the identification of a new species, M. caml. Grenadier are the main by ... -catch in the toothfish fishery and modelling suggests that they may be subject to predation release as ... , less than six months after sampling. Samples were identified to species in the laboratory following ... position and end setting position of the set on which the sample was caught. Samples of both species of ... Grenadiers (Family Macrouridae) are taken as by-catch in many of the toothfish fisheries in the Southern ... Ocean (e.g. Duhamel et al., 1997; Morley et al., 2004; Stevenson et al., 2014). Grenadiers are the ...
Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 15–28 : Autor(es): Pinkerton, M.H., C. Ó Maolagáin, J. Forman and P. Marriott
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An assessment of toothfish in Subarea 48.3 using CASAL
paper presents an assessment of the stock of toothfish around South Georgia (Subarea 48.3) using the ... CASAL stock assessment software (Bull et al., 2005). Detailed attention is given to the incorporation of ... as much of the available tuning data as possible, as well as a whole range of assessment ... sensitivities – to fixed parametric assumptions, model structures and alternative data scenarios. Given the ... (1) to compute effective sample sizes) and then the same quantities are recomputed after an initial ... value of M to the lower of the previously assumed CCAMLR limits, 0.13, and to the upper end of that ... 000 000 samples from the posterior were drawn, after a burn-in period of 100 000 iterations, and ... – r.hillary@imperial.ac.uk Abstract This paper presents an assessment of the stock of toothfish around South ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 65–95 : Autor(es): Hillary, R.M., G.P. Kirkwood and D.J. Agnew