Résultats de la recherche
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On the power to detect changes using the standard methods for monitoring parameters of predatory species
Paper Title: On the power to detect changes using the standard methods for monitoring parameters ... of predatory species Abstract / Description: The CCAMLR guidelines (CCAMLR, 1989) for analyzing the ... considered here are insufficient for conducting power analyses (penguin arrival weight A1.1, trend in penguin ... population size A3.1, penguin demography A4.1, penguin fledging weight A7.1). Alternative forms for analyses ... ) to compute the requisite sample sizes for detecting changes of 10%, 20% and 30% of the mean value ... sample sizes for detecting changes of 10%, 20% and 30% of the mean values are shown in Table 2. No ... detect changes of 10%, 20%, and 30% of the mean values for Adelie and chinstrap meal size (Table 6 ... %) 119 96 72 46 2.48 (20%) 31 25 1 9 1 3 3.72 (30%) 1 5 1 2 9 7 For Cl = 0.10: 1.24 (10%) 99 79 57 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Auteur(s): Boveng, P. and J.L. Bengtson
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Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives
Paper Title: Refinements to the strategy for managing depleted fish stocks based on CCAMLR ... fish stocks to recover to levels near those giving greatest net annual increment within two to three ... that applying a policy of F 0.1 will not always lead to stock recovery in two to three decades, and ... hence that additional management policies are required for depleted stocks. The implications of these ... been put into effect the target years for recovery become fixed at 20 and 30 years after the procedure ... distribution at year 20 is the sum of the projected distributions, for the set of current stock states in the ... used for the two hypothetical fish stocks. Lower yielding stock Natural Mortality = 0.15 year! Von ... terms). SIR CV Current PL•20 > 0.95 PONAI.20 = 0.5 PGNAI.30~0.95 Stock at Stock 30 years Lower ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Auteur(s): de la Mare, W.K. and A. Constable
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Some comments on the procedure for testing estimators of krill abundance which utilise survey data
Paper Title: Some comments on the procedure for testing estimators of krill abundance which ... provide an encouraging improvement in fits to the distribution of inter-swarm distances observed on the ... indeed likely to provide improved performance in practice. Such studies require a simple method for ... distributions from surveys. ‘Two-level’ models of krill distribution are considered. These achieve overall ... The ability of the two-level models considered to mimic an observed spatial distribution pattern for ... procedure in most circumstances. An objection that has been raised to this approach is that it is ... ; further, an underlying density trend could be argued from inspection of this plot. However, for the ... of proportionality for the two expressions of equation (2) could differ, but in the interests of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 191–205 : Auteur(s): Butterworth, D.S., D.L. Borchers and D.G.M. Miller
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Effects of recruitment variability and natural mortality on generalised yield model projections and the CCAMLR decision rules for Antarctic krill
decision criteria for at least two of the four recruitment vectors based on net sampling, regardless of how ... projections and the CCAMLR decision rules for Antarctic krill Abstract / Description: The generalised yield ... model (GYM) was used by CCAMLR to establish the precautionary catch limit for the Antarctic krill ... natural mortality rate of 0.8 and recruitment variability generated using a Beta distribution for ... while meeting CCAMLR decision criteria for at least two of the four recruitment vectors based on net ... years and CCAMLR criteria calculated both for any given year in all years, and for only the final year ... episodic on an approxi- mately five- to six-year cycle (Siegel et al., 2003; Ducklow et al., 2007). In ... on P ro po rti on P ro po rti on P ro po rti on P ro po rti on 20 30 ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 81–96 : Auteur(s): Kinzey, D., G. Watters and C.S. Reiss
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Seal mitigation measures on trawl vessels fishing for krill in CCAMLR Subarea 48.3
Paper Title: Seal mitigation measures on trawl vessels fishing for krill in CCAMLR Subarea 48.3 ... methods employed for consideration by the ad hoc Working Group on Incidental Mortality Arising from ... Fishing (WG-IMAF). Three CCAMLR international scientific observers recorded mitigation measures for fur ... season. These approaches, aimed at reducing seal entanglements, are similar to the two systems ... measures on trawl vessels fi shing for krill of a metal grid sloped at an angle to divert seals out ... krill A combination of an escape panel and a mesh barrier were used on the Nitaka Maru for the ... device, seal entanglements were recorded for the fi rst two trawls. As a result, the gear was modifi ed ... where the headrope and groundrope connected to the warps. Two mesh planes, 44 m in width and 20 m in ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 195–205 : Auteur(s): Hooper, J., J.M. Clark, C. Charman and D. Agnew
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A risk-management framework for avoiding significant adverse impacts of bottom fishing gear on Vulnerable Marine Ecosystems
Paper Title: A risk-management framework for avoiding significant adverse impacts of bottom ... , closed areas around identified VMEs, open and closed management areas, by-catch limits for VME-forming ... fishing gear on Vulnerable Marine Ecosystems Abstract / Description: CCAMLR adopted a new conservation ... measure in 2007 to ensure that significant adverse impacts of bottom fishing gear on Vulnerable Marine ... information is not known, as is the case for VMEs in the Southern Ocean, an appropriate spatial scale for ... Likely (5) 0 5 10 15 20 25L ik el ih oo d Almost certain (6) 0 6 12 18 24 30 Martin-Smith 184 ... studies. For example, damage to Lophelia pertusa reefs off Norway was estimated to be 30–50%, but the ... activities (CCAMLR, 2007b, paragraph 5.12) and the necessity to develop an approach for identifying VMEs ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 177–193 : Auteur(s): Martin-Smith, K
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Guidelines for the preparation of hydroacoustic survey reports on krill
requirements for the preparation of reports of echometric surveys. An example is provided of the preparation of ... Paper Title: Guidelines for the preparation of hydroacoustic survey reports on krill Abstract ... / Description: The proposed guidelines provide an opportunity to perform comparative analyses and checks of ... surveys. The unification of echometric survey data is aimed at increasing the effectiveness of research on ... peltca 19/X1 1980 20-29/X1 30/X1 31/X1 1980-10/ 1981 BbIXO,D; H3 CeBaCTOnOJIR. Pas60pKa 3KCne ... - 165 - SC-CAMLR-V/BG/37 GUIDELINES FOR THE ... guidelines provide an opportunity to perform comparative analyses and checks of results obtained during ... of biomass of organisms. The guidelines contain a description of requirements for the preparation ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 165-193 : Auteur(s): Kalikhman, I.L.
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A first attempt at an assessment of the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands EEZ
Paper Title: A first attempt at an assessment of the Patagonian toothfish (Dissostichus ... eleginoides) resource in the Prince Edward Islands EEZ Abstract / Description: The history of the fishery for ... maximum of about 400 tonnes. Implications for surveillance are discussed. File: 02brandao-etal.pdf ... analyses conducted in this paper. The legal catch indicated for 2001 is an estimate. Year Legal ... 2009 2012 2015 2018 2021 Year Bi om as s (t) 0 400 800 Exploitable biomass projections for base ... for base case (h = 0.6) 20 Brandão et al. Figure 2: Population model fi ts and 20-year ... 2003 2006 2009 2012 2015 2018 2021 Year Bi om as s (t) Exploitable biomass projections for higher ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 11–32 : Auteur(s): Brandão, A., D.S. Butterworth, B.P. Watkins and D.G.M. Miller
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Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels
together. An extensive photo-identifi cation effort, primarily focussing on killer whales, allowed a total ... Exclusive Economic Zones: an assessment of depredation levels Abstract / Description: Interactions between ... whales. These two species, alone or in co-occurrence with each other, were observed in 71% of the 1 308 ... two species, alone or in co-occurrence with each other, were observed in 54% of the 6 262 longlines ... identifi ed on 23 different occa- sions). 0 5 10 15 20 25 30 2 3 4 5 6 7 8 9 10 11 12 13 14 20 21 ... Patagonian tooth- fi sh fi shery in the Crozet Exclusive Economic Zone (EEZ). Two possible explanations for ... recorded. Only their presence was therefore recorded. The co-occurrence of two species was recorded as an ... interacting was 8.2 ± 4.7 (n = 552, range 1–20) and 4.1 ± 3.4 (n = 737, range 1–30) individuals respectively ...
Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Auteur(s): Roche, C., C. Guinet, N. Gasco and G. Duhamel
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Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey
Paper Title: Midwater trawl catchability as an aspect of a quantitative assessment of krill ... catchability and krill distribution patterns. A comparative analysis of trawl catchability for commercial ... 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 ... case using an Isaacs-Kidd trawl, demonstrated the futility of using the latter for trawl census ... stratified by specific biomass. An assessment of catchability for the Isaacs-Kidd trawl operating between 0 ... commercial trawl and by almost an order of two more than that with an Isaacs-Kidd trawl. The catch per ... Kq for the Isaacs-Kidd to be greater by almost an order of magnitude than the commercial 72/308 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Auteur(s): Kasatkina, S.M.