Résultats de la recherche
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Antarctic krill and climate change
particular, it was concluded that current precautionary management measures need to be maintained, until ... Abstract: During April 2011, a multi-national group of scientists with expertise on Antarctic ... ocean warming, sea ice loss, and ocean acidification. It was concluded that the cumulative impact of ... climate change on krill is probably negative. To be able to account for climate change-induced ...
Meeting Document : SC-CAMLR-XXX/BG/03 : Auteur(s): Delegation of the European Union
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Variability and predictability of Antarctic krill swarm structure
) echosounder, concurrent with net sampling. The acoustic data were analysed through applying a swarm ... , containing swarms that were isolated (>100 km away from the next swarm). The distribution of swarm types ... over the survey grid was examined with respect to a number of potential explanatory variables ... immature krill. We propose that, at the mesoscale level, the structure of swarms switches from being ...
Meeting Document : WG-EMM-10/P10 : Auteur(s): G.A.Tarling, T. Klevjer, S. Fielding, J. Watkins, A. Atkinson, E. Murphy, R. Korb, M. Whitehouse and R. Leaper
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Adult male Antarctic fur seals: tourists, trouble makers or marine ecosystem sentinels?
when effort is at is maximum at the South Orkney Islands. We recommend that this overlap should be ... considered in understanding the functional response of penguins and suggest that male AFS could be a useful ... Abstract: Resource competition often results in mechanisms that ameliorate its effects, typically ... spatial and temporal overlap between predators that exploit the same resource then is fundamental to ...
Meeting Document : WG-EMM-2019/49 : Auteur(s): A. Lowther, C. Lydersen and K. Kovacs
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Further development of coarse- and medium-scale spatially explicit population dynamics operating models for Antarctic toothfish in the Ross Sea region
sensible, with a clear pattern that the proportions mature were a function of location and age. Tag release ... and medium-scale spatial resolution and consider scenarios where abundance can be present over the ... program allows implementation of an aggregate movement model for use with large numbers of areas as a ... discrete time-step state-space model that represents a cohort-based population age structure in a spatially ...
Meeting Document : WG-FSA-12/44 : Auteur(s): S. Mormede, A. Dunn, S. Parker and S. Hanchet (New Zealand)
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Research and monitoring to support an MPA in the Ross Sea Region
largely represents a mechanism for generating discussion that we hope will be useful to all Members ... of what we present here can, where appropriate, be merged with elements developed by others to ... plans to support marine protected areas (MPAs). Although CM 91-04 provides general guidance that such ... research pursuant to the specific objectives of the MPA; (b) other research consistent with the specific ...
Meeting Document : WG-EMM-12/46 : Auteur(s): G.M. Watters and C.S. Reiss (USA)
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Using predators and their prey to characterise the status of the marine ecosystem at South Georgia
, coupled with data that describe the density of their principal prey, Antarctic krill. Here we explore some ... of the longest time series of such data yet available, using records that were closely matched with ... status of marine predators might be used to inform ecosystem-based management approaches. In the ... consistent ecological time periods. Our results show that: (i) at the larger scale, some predator variables ...
Meeting Document : WG-EMM-16/28 : Auteur(s): P. Trathan, S. Fielding, S. Hill, M. Belchier and J. Forcada
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Population dynamics of the wandering albatross Diomedea exulans at Marion Island: long-line fishing and environmental influences
that attempts to breed in a given year. Changes in several demographic parameters that appear to be ... in the Marion Island population has fluctuated over the past three decades and appears to be the ... breeders in the population was positively correlated with the maximum ENSO index, whereas the annual ... survival rates of breeding adults were negatively correlated with Japanese pelagic longline fishing effort ...
Meeting Document : WG-EMM-03/11 : Auteur(s): D.C. Nel, F. Taylor, P.G. Ryan and J. Cooper (South Africa)
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Population dynamics of wandering albatrosses Diomedea exulans at sub-Antarctic Marion Island: longline fishing and environmental influences
changes in several demographic parameters that appear to be influenced by both environmental and ... the past three decades and appears to be the result of both real changes in the size of the population ... and changes in the proportion of the population that attempts to breed in a given year. We describe ... anthropogenic effects. The proportion of first-time breeders in the population was positively correlated with ...
Meeting Document : WG-FSA-02/16 : Auteur(s): D.C. Nel, P.G. Ryan and J. Cooper (South Africa)
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An approach to feedback management (FBM) of the krill fishery based on routine acoustic data collection and intermittent land-based predator studies
alternative approach for decades, but still lacks a plan that can be made operational within realistic cost ... and effort levels. Our proposal outlines that acoustic data would be collected, processed and ... can be integrated with finer-scale knowledge of top predator feeding strategies and updated through ... . As the trigger level lacks any form of relationship with the actual stock condition this approach is ...
Meeting Document : SC-CAMLR-XXXVI/BG/20 : Auteur(s): Delegations of Norway, China and Chile
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Estimates of abundance of Dissostichus eleginoides and Champsocephalus gunnari from the random stratified trawl survey in the waters surrounding Heard Island in Division 58.5.2 for 2019
average. Invertebrate catch (including jellyfish) in the 2019 survey was lower than that of 2018, with ... ) around Heard Island and McDonald Islands (HIMI) was conducted in CCAMLR Division 58.5.2, with the ... design and the duration of the hauls were similar to recent surveys, but with a new set of randomly ... of the survey. The catch of Dissostichus eleginoides (Patagonian toothfish) was 30.5 t which, while ...
Meeting Document : WG-FSA-2019/03 : Auteur(s): G.B. Nowara, T.D. Lamb and P. Ziegler