Search results
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Age distribution of breeding female Antarctic fur seals in relation to changes in population growth rate
in 1971-1973 was 7.41 (SE = 0.26) years and in 1988 it was 6.93 (SE = 0.20) years. After correction ... (SE = 0.26) years and in 1988 it was 6.93 (SE = 0.20) years. After correction for age-dependent ... for age-dependent arrival time at the pupping beach in 1988, the mean age was 6.22 (SE = 0.14 years ... -1972. Exponential models fitted to the frequency distribution of age-classes greater than age 5 years ...
Meeting Document : WG-CEMP-91/21 : Author(s): I.L. Boyd, N.J. Lunn, P. Rothery and J.P. Croxall (United Kingdom)
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Foraging energetics of Antarctic fur seals in relation to changes in prey availability
of lactating female Antarctic fur seals, Arctocephalus gazella, foraging at sea was measured in two years using ... doubly labeled water at South Georgia Island. There was no difference between years in mass gain, water ... influx, mass-specific field metabolic rate (FMR), or absolute FMR. Mean at-sea FMR over both years ... -provisioning rate) appear to reflect prey availability. The similarity between years in mass increase suggests ...
Meeting Document : SC-CAMLR-VIII/BG/13 : Author(s): Delegation of United Kingdom
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Integrating Climate and Ecosystem Dynamics in the Southern Ocean (ICED) programme: a report on recent joint activities and links between ICED and CCAMLR
of interest to CCAMLR. The 2018 ICED Projections Workshop, undertaken in collaboration with CCAMLR, provided ... to CCAMLR. The 2018 ICED Projections Workshop, undertaken in collaboration with CCAMLR, provided an initial ...
Meeting Document : WG-EMM-2019/02 : Author(s): R.D. Cavanagh, N.M. Johnston and E.J. Murphy
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Exploring variability in the locations used by the krill fishery in Area 48 in relation to intra- and inter-annual variability in seasonal sea ice
in their behaviour, targeting fixed geographic locations in most years. In contrast, in Subarea 48.1, fishing ... locations show considerable variability between years. In Subarea 48.2 ice cover tends to increase rapidly ... 48.1 has shifted in recent years with most catch being taken south of the South Shetland Islands since ... 2008/09 in contrast to earlier years when the mean catch location was always to the north and west ...
Meeting Document : WG-EMM-14/11 : Author(s): J. Silk, S.L. Hill and P.N. Trathan (United Kingdom)
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Climate change and zooplankton dominance in the Antarctic marine ecosystem: implications for the food web
has been warming over the past 40 years with an associated decreased frequency of winters ... ) and population dynamics of salps (Salpa thompsoni). Strong krill recruitment success there follows years ... years suggests that the food web may be affected by climate change. The 1994/95 austral summer season ... followed the first prolonged winter sea-ice season in three years and provides a strong contrast ...
Meeting Document : WG-EMM-96/21 : Author(s): Siegel, V., Fraser, W., Trivelpiece, S., Holm-Hansen, O., Loeb, V., Hewitt, R., Trivelpiece, W.
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A simple approach for calculating the potential yield of krill from biomass survey results
-exploitation level over a 20 year period of harvesting should not exceed l0%. The value of λ depends strongly ... for the calculations is that the probability that the kri11 spawning biomass drops below 20% of its average pre ... is that the probability that the kri11 spawning biomass drops below 20% of its average pre-exploitation level over a 20 ... year period of harvesting should not exceed l0%. The value of λ depends strongly on the value ...
Meeting Document : WG-KRILL-91/24 : Author(s): D.S. Butterworth (South Africa) and M. Basson (United Kingdom)
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Investigation of the sensitivity of the Ross Sea toothfish assessment to withholding subsets of the available data
on model outputs of withholding from a stock assessment between one and eight years of age frequency ... the effect of not updating an assessment every year, and also the evolution of stock assessments with time ... as more years’ data becomes available. The 2009 stock assessment of Antarctic toothfish in the Ross Sea ... withholding data was found to be highest in the earlier years of stock assessments, when each extra year ...
Meeting Document : WG-SAM-11/17 : Author(s): S. Mormede (New Zealand)
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Southern right whale (Eubalaena australis) reproductive success is influenced by krill (Euphausia superba) density and climate
. The number of calves recorded each year varied from 7 to 43 (x = 21.11 ± 11.88). Using cross-correlation ... correlations were found with krill densities (r = 0.69, p = 0.002, lag 0 years), Oceanic Niño Index (r = −0.65 ... , p = 0.03, lag 6 years), Antarctic Oscillation (r = 0.76, p = 0.01, lag 7 years) and Antarctic sea ice area ... (r = −0.68, p = 0.002, lag 0 years). Our results suggest that global climate indices influence southern right ...
Meeting Document : WG-EMM-16/P06 : Author(s): E. Seyboth, K.R. Groch, L. Dalla Rosa, K. Reid, P.A.C. Flores and E.R. Secchi
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Preliminary results of the experiments on the krill transport study in the South Orkney area (April 1992)
within the square of 30 x 30 miles northwestwards of Coronation Island in the fishing fleet operation ... the square of 30 x 30 miles northwestwards of Coronation Island in the fishing fleet operation area ...
Meeting Document : WG-CEMP-92/34 : Author(s): L.G. Maklygin, V.N. Shnar, A.P. Malyshko (Russian Federation) and A.G. Shepelev (Ukraine)
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Increasing abundance of Type A killer whales (Orcinus orca) in the coastal waters around the Antarctic Peninsula
in other parts of the world. Sightings of Type A around the AP have been increasing in recent years ... telemetry (n = 10 tags) and photo-identifications (13 years, 15,828 photographs) collected between austral ... re-sightings of the same whales were common across years (up to 13 years), and a Bayesian mark ... -recapture analysis estimated that the average annual abundance has increased significantly in recent years ...
Meeting Document : WG-EMM-17/49 : Author(s): H. Fearnbach, J.W. Durban, D.K. Ellifrit and R.L. Pitman