Search results
-
A fine-scale model of the overlap between penguin foraging demands and the krill fishery in the South Shetland Islands and Antarctic Peninsula
developed. The new index reflects the functional interaction between these two utilisers of the krill ... developed. The new index reflects the functional interaction between these two utilisers of the krill ... was determined as where P, is the total number of pairs in colony t of colonies (only one bird from a pair ... is assumed to be foraging at any one time), f(x) is the foraging distribution function (a normal density ... + 50% (percentage change ~n parenthesis) Penguin Foraging Overlap with Krill Fishery As one ... parameters, as one would expect from a model which is designed to describe the spatial overlap between ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 99–110 : Author(s): Agnew, D.J. and G. Phegan
-
Spatially explicit population dynamics models for Antarctic toothfish in the Ross Sea region
the dynamics of spatial heterogeneity of the population along with age structure, movement and reproductive ... stage transition in a holistic framework. Using this software, three spatially explicit age-structured ... with the results of tagging studies and fits to the other observations (age, reproductive development) were ... of the population along with age structure, movement and reproductive stage transition in a holistic framework ... -year time steps, plus one instan- taneous time step for aging and the movement of spawners back ... (pre-spawners function), depth and habitat (mature functions) Fixed rate of 1 All age by one year ... 15 20 25 30 Age (years) 1.0 0.8 0.6 0.4 0.2 0.0 S el ec tiv ... assessment is biased low by 19–43%. Mormede et al. 20 one or the other of these methods are available ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 19–37 : Author(s): Mormede, S., A. Dunn, S. Hanchet and S. Parker
-
Australian research on Antarctic bird and seal diets
Heard and Macquarie Islands have been collected during the last seven years. Published and unpublished ... is cantered the CCAMLR Ecosystem Monitoring Programme's priority study area, Euphausia superba forms ... -Antarctic Heard and Macquarie Islands have been collected during the last seven years. Published ... but one stomach, and the mean number per stomach was 42, range 1-117. Two specimens of P. antarcticum ... " years, extensive sea ice forces the penguins to forage further away from the breeding colonies, thus ... B paHOHaX 3aJIHBa I1PIO,l{3 H cyoaHTapKTH"4eCKHX OCTPOBOB Xep,l{ H MaKKYOpH. On ... YOJIHKOBaHHhle H HeOnYOJIHKOBaHHhle ,l{aHHhle CBe,l{eHhI BOe,l{HHO, B pe3YJIbTaTe "4erO B03HHKaeT P.H,l{ Ba)l(HbIX BOnpOCOB ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 231-249 : Author(s): Williams, R.
-
CCAMLR ecosystem monitoring and management: future work
from one year to the next. For more mobile species, the effects may be promulgated through the whole ... . Consequently, changes in predator performance from one year to the next may simply be due to this natural ... into small-scale management units. This remains a predictive approach to man- aging krill fi sheries. CEMP ... la Mare model is the only one to have a closed predator–prey system; it is modelled with a single ... use scientific evidence in the decision-making process. Even though this approach was based on the ... on the scientific information available and the assessments that arise from such information. To ... up to detect the effects of fishing on krill predators. CCAMLR needs to adopt a management procedure ... system, (ii) methods for assessing the status of the system, (iii) decision rules on how to adjust ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 233–253 : Author(s): Constable, A.J
-
Differences in distribution and population structure of krill (Euphausia superba) between penguin and fur seal foraging areas near Seal Island
50 to 100 m in the day while at a shallower range from 20 to 50 m at night. In the offshore foraging ... , tending to be at a deeper range from 50 to 100 m in the day while at a shallower range from 20 to 50 ... cercanas a la costa. 1. IN1RODUCTION The Seal Island area is one of the active sites in the Antarctic ... ) (six trips), one macaroni penguin (Eudyptes chrysolophus) and one female fur seal (Arctocephalus ... gazella). Most penguins were tracked for the majority of one entire feeding trip. The trip of the female ... choose offshore foraging areas over inshore ones, despite the former areas being far more remote from ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 273–285 : Author(s): Ichii, T., H. Ishii, J.L. Bengtson, P. Boveng, J.K. Jansen and M. Naganobu
-
Distribution characteristics of krill aggregations in the fishing ground off Coronation Island in the 1989/90 season
should be regarded as preliminary since they were based on data from one season only. Distributional ... type. The results obtained should be regarded as preliminary since they were based on data from one ... Coronation Island in the 1989/90 season Abstract / Description: Distributional characteristics of krill ... in the 1989/90 season ... larger proportion of spawning females, a predominance of males over females by two to one and also ... based on data from one season only. Distributional characteristics of kriU aggregations varied ... per haul; at = standard deviation of the duration of one haul; mt = mathematical expectation ... of the duration of one haul. Krill biological condition was determined according to "Methodical Instructions ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 49–73 : Author(s): Kasatkina, S.M. and V.I. Latogursky
-
Midwater trawl catchability in relation to krill and possible ways of assessing gross catch
calculations. A comparison of the experimental hydroacoustic assessment with the calculated one demonstrated ... of the experimental hydroacoustic assessment with the calculated one demonstrated that the theoretical model agreed ... and also the probability that krill will come into contact with various parts of the net as it passes ... that krill will come into contact with various parts of the net as it passes through the trawl sides. Studies ... through one square metre of netting. The amount of laill passing through increases to 1.14 kg when ... . A comparison of the experimental hydroacoustic assessment with the calculated one demonstrated ... and in the trawl mouth (Kasatkina, 1988). Integration in the mouth of the trawl allows one to assess not only ... numbers of depressor weights on one wing, it was possible to change the vertical opening of the trawl ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 87–113 : Author(s): Zimarev, Yu.V., S.M. Kasatkina and Yu.P. Frolov
-
A rationale for conservation areas within Antarctic waters
: The application of potential conservation measures listed in Article IX 2 of the Convention requires ... resources’ (Article IX 2 (b)). In order to select meaningful boundaries for such areas, first priority has ... potential conservation areas are proposed: 70°W- 15°W 15°W- 40°E 40°E- 90°E 90°E- 150°E 150°E- 160°W 160 ... The application of potential conservation measures listed in Article IX 2 of the Convention ... KOHCYMeHToB. BKnIOLJan ycaThlx KHTOB. TIOneHeH 11 nI1HrBI1HOB. BhlABl1raeTCn npeAnOnO)l{eHHe ° B03MO)l{HOH ... only one area has been closed to fishing (within 12 nautical miles of South Georgia). One ... entity of E. superba as a single composite population. As pointed out by Latogursky, one ... of the important research tasks is to determine the routes and rates of exchange between one sub-population ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 513-535 : Author(s): Chittleborough, R.G.
-
Low genetic diversity in the Antarctic toothfish (Dissostichus mawsoni) observed with mitochondrial and intron DNA markers
with mitochondrial and intron DNA markers Abstract / Description: Two molecular methods, mitochondrial and intron ... Two molecular methods, mitochondrial and intron DNA markers, were used to determine genetic ... al., 1994), but DNA analyses showed evidence for two genetic units, one around South Georgia ... - trol region. One SS fi sh had a T > C transition at position 198, and two AAT individuals had ... ). Of the 13 recaptures, there was one long-distance movement, almost 800 km north (72°S) after 3.3 years ... of populations or stock units of D. mawsoni is unknown. There may be one genetic stock with gene fl ow via ...
Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 43–51 : Author(s): Smith, P.J. and P.M. Gaffney
-
Identifying taxonomic groups vulnerable to bottom longline fishing gear in the Ross Sea region
, including two indicator-only taxa. File: 05parker-bowden.pdf ... as vulnerable to bottom longline fishing activities in the Ross Sea region, including two indicator-only taxa. ... approached 30 years of age (Miller et al., 2004). Stylasterids can be large, up to 1 m in height in Alaska ... Rhabdocalyptus dawsoni in a British Columbia fjord, extrapolated to 220 years of age for large speci- mens ... m near the Bahamas was aged using amino acid com- position at 250 years, which conflicted with a radi ... - ocarbon age estimate of 1 800 years (Goodfriend, 1997). Subsequently, several specimens have been shown ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 105–127 : Author(s): Parker, S.J. and D.A. Bowden