Resultados de la búsqueda
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Telemetry monitoring of ecological resources
system developed at the University of Minnesota in the mid-1960s 20 • It used two mechanically rotating ... Nimbus system. However, animal tracking using satellites began in earnest with the Argos system. The ... implanted radio transmitters in ducks. J. Wildl. Manage. 48(3) : 982-987 19. Garshelis, ibib. 20 ... commercial transistor in the late 1950s, the application of electronics to the monitoring of biological ...
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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Spatial distribution of management measures, Antarctic krill catch and Southern Ocean bioregions: implications for conservation planning
between habitat (bioregion), existing spatial management and Antarctic krill catch in the Southern Ocean ... important differences between pelagic bioregions in terms of the fraction that was open to fishing, and the ... has ever been fished, and this fishing is concentrated in three of the seven bioregions found in the ... be used to prioritise protection for bioregions that are currently under-represented in marine ... (2003) noted that during the years of highest recorded fishing activity, the Soviet fleet operated in ... biore- gion defined on the basis of long-term (up to 30 years) averages of time series (Grant et al ... . 2002. Rigor and Representativeness in Marine Protected Area Design. Coastal Man- agement, 30 (3): 237 ... with similar distributions across the Convention Area. 0 5 10 15 20 25 30 35 0 2 4 6 8 10 12 ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 1–19 : Autor(es): Grant, S.M., S.L. Hill and P.T. Fretwell
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Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald Islands using catch-at-age and aged mark-recapture data from the main trawl ground
obtained using proportions-at-length and fishery- and year-specific age–length keys (ALKs) for years 1998 ... in R, based on alternative ordinary differential equations (ODE) for within-year population dynamics ... in integrated assessments via CASAL for the Heard and McDonald Islands (HIMI, Division 58.5.2 ... to 2008. A large proportion of the recaptures of fish released in this fishery were aged and these ... Poisson. 0 10 20 30 40 50 0 50 10 0 15 0 Bin Mean Expected Recaptures B in R es id ua l V ar ia ... season 3 (late-season: 1 October–30 November) as given in Candy and Welsford (2009). The legal HIMI ... numbers-at- age. Of the total recaptures in f2 across these years, including those removed by the above ... totalled across years of release and recapture are given in Table 2. The number of age classes ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 29–45 : Autor(es): Candy, S.G., D.C. Welsford, T. Lamb, J.J. Verdouw and J.J. Hutchins
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Evaluating the impact of multi-year research catch limits on overfished toothfish populations
assessed in this study indicate that, where a stock has been depleted to at or below 20% of the median ... populations Abstract / Description: In stocks that have been depleted by overfishing, the benefit of ... research catches, this study shows that stocks can take decades to recover even in the absence of fishing ... unfished spawning stock biomass, research catches in excess of 0.6% of median unfished total stock biomass ... that results in a greater than 50% chance after 20 years that the stock has recovered to 95% of the ... is greater than 20 years are shaded light grey and those where recovery is greater than 30 years are ... class in stock 1 year Last age class in stock 35 years Oldest age in initial structure 36 years ... structure 1 Years prior to fishing 5 Reference start date in year 1/1 Increments in year 365 Years ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 47–55 : Autor(es): Welsford, D.C
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Revised estimates of seabed areas within the 500 m isobath of the South Orkney Islands (subarea 48.2) and consequences for standing stock biomass estimates of nine species of finfish
250-500 m depth intervals. The updated estimates are about 1 424 (20%) n miles larger in area within ... examined, the point estimate of total biomass increased from 5 to 30% for eight species and decreased by 20 ... the 50-500 m isobaths than Everson's estimates, though changes in area are specific to the depth ... interval. There is a corresponding change in estimated biomass within strata when these areas are ... PaCCMOTPeHHbIX BNAOB OqeHKa o6qet ~ H O M ~ C C ~ I BO3pOCna Ha 5-30% AJIR 8 BHAOB M COKpaTHJIOCb Ha 20% AnR ... total aumento entre 5 a 30% para ocho de las nueve especies de peces examinadas, y disminuy6 en 20 ... 20% overall higher estimate of seabed area in this study due to a more extensive computed seabed ... strongly influenced by changes in seabed area of strata (-37%, 23% and 30% respectively; Table 3 ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 197–204 : Autor(es): C.D. Jones
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CCAMLR ecosystem monitoring and a feedback management procedure for krill
-term declines in land-based predator performance (e.g., reproductive performance) that may be ... attributable to loss of prey through fishing activities. The principal fishery in the CCAMLR Convention Area is ... the krill fishery and this paper examines ways in which the information being obtained from the ... alter conservation measures based on options in Article IX of the CCAMLR Convention and dictated by the ... sufficient time to ensure that the objectives set out in Article IT of the CCAMLR Convention are not ... , Article IT can be translated, in the case of the predators, to ask the general question "Will fishing for ... relationships as described in Article 11. As a result, the goals in predator protection for the kriU fishery ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 345–350 : Autor(es): Constable, A.J.
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An assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank (CCAMLR Division 58.4.3b) based on fine-scale catch and effort data
(CCAMLR Division 58.4.3b) based on fine-scale catch and effort data Abstract / Description: In 2006, the ... biological data submitted by scientific observers on board vessels in the fishery. Results of a Leslie ... of toothfish at the scale of individual fishing grounds in the 2004/05 and 2005/06 seasons. This ... inconsistencies are noted between historical data and those submitted in the 2006/07 season, with Patagonian ... in 2003/04, 49 (2.4%) were excluded from analysis due to missing data. Of these, 20 events had no ... mean weight for this species is almost uni- formly below 20 kg across all seasons and grounds. In ... comparison, median mean weight for D. mawsoni is typically greater than 20 kg. Dissostichus mawsoni in ... reverse for many years, even in the absence of fishing. Analyses in this paper confirm the broad con ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 55–78 : Autor(es): McKinlay, J.P., D.C. Welsford, A.J. Constable and G.B. Nowara
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The gentoo penguin as a candidate species for the CCAMLR Ecosystem Monitoring Program
years at Bird Island, South Georgia and at the South Shetland Islands (both within Integrated Study ... in the CEMP. The extensive dependence of this species in these ISRs on Euphausia superba, (including ... in winter), its residence in the ISRs in winter and its early attainment of sexual maturity are all ... features of special relevance to the CEMP. File: 30-Croxall-and-Williams.pdf ... since 1976 at Bird Island, South Georgia (Croxall et al., 1988a; Williams, 1990), and in most years ... ). Only in one year (1985) did the proportion of E. superba fall below 65%. During the winters of 1987 ... CONSIDERATIONS 4.1 Resident Species Gentoo penguins remain in the vicinity of their breeding colonies year ... dietary and other biological information collected over several years at Bird Island, South Georgia and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 483–488 : Autor(es): Croxall, J.P. and T.D. Williams
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Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000
line-transect acoustic survey data gathered in the boxes during austral summers from 1996 to 2000 ... 80 km transects in each box, providing about 1 600 density estimates per box. The MaxEnt technique ... × 0.5 km cells in each box, taking explicit account of the spatial relationship between densities in the ... observed data. Despite some very large interannual and regional differences in mean krill density, the ... (MaxEnt) have been used successfully for many years in numerous branches of physical science to ... . Although there are some very large differences in mean krill density between years (ranging from 36 to 12 ... consistent features between years for each box. In the west, in three of the four years for which data are ... , in the east, for all three years when data are available, a cluster is visible at approximately x ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Autor(es): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins
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Investigations of required sampling regimes for environmental parameters
speed continuously or as daily maxima and minima would be sufficient to detect a 10 to 20% change in ... / Description: The sensitivity of different sampling regimes in identifying inter-annual changes in ... 1987. Strong daily, depressional (4 to 5 days) and yearly cycles were seen in temperature, wind speed ... and pressure. Sampling daily maxima and minima would be sufficient to detect a 2 to 3°C change in ... temperatures in that 563 year were lower than for the other two years (see Figure 1). Maximum and minimum ... minima would be sufficient to detect a 2 to 3°C change in monthly mean temperature over two years with a ... would be sufficient to detect a 10 to 20% change in monthly mean log-transformed wind speed a of 0.05 ... Working Group (1989) suggested that sampling strategies should be able to detect a 10% or 20% change in a ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 561–573 : Autor(es): Agnew, D.J.