Resultados de la búsqueda
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Biogeographic patterns of benthic invertebrate megafauna on shelf areas within the Southern Ocean Atlantic sector
Paper Title: Biogeographic patterns of benthic invertebrate megafauna on shelf areas within the ... properties. Analysis of the benthic invertebrate megafaunal assemblages of shelf habitats within the Atlantic ... total biomass data and the composition of phyla that contribute to that biomass. An examination of ... physical oceanographic data reveals a pattern of shelf faunal zonation: the benthic invertebrate ... meet and mix in this region. Evident at smaller spatial scales are the effects of disturbance regimes ... thwarted by sparse records. Even where advances in both have been so great as to allow the delineation of ... attempted to characterise megafaunal assemblages beyond localised shallow embayments in the vicin- ity of ... within the Atlantic sec- tor of the Southern Ocean were analysed in order to identify and characterise ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 167–192 : Autor(es): Lockhart, S.J. and C.D. Jones
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Draft MPA Report for the South Orkney Islands, Subarea 48.2; Part of CCAMLR MPA Planning Domain 1, Western Peninsula – South Scotia Arc
Abstract: In this paper we provide a brief history that describes the development of management ... plans and research and monitoring plans for CCAMLR MPAs. We develop a worked example of the management ... the information necessary for CCAMLR’s planning purposes, including the identification of other ... develop spatial protection measures is through the appropriate combination of scientific data and ...
Meeting Document : WG-EMM-13/10 : Autor(es): P. Trathan and S. Grant (United Kingdom)
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Effects of sea-ice extent and krill or salp dominance on the Antarctic food web
trophic levels in the Antarctic marine food web. The pelagic tunicate Salpa thompsoni can also be ... important during spring and summer through the formation of extensive and dense blooms. Although salps are ... chlorophyll-a that indicate that there is a degree of competition between krill and salps. Our analysis of the ... decreased frequency of winters with extensive sea-ice development over the last five decades. Our data ...
Meeting Document : WG-EMM-97/73 : Autor(es): Hewitt, R., Trivelpiece, S., Fraser, W., Holm-Hansen, O., Siegel, V., Trivelpiece, W., Loeb, V.
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Modelling growth of Antarctic krill: a new approach to describing the growth trajectory
Abstract: Von Bertalanffy (VB) growth models for Antarctic krill have in the past been calibrated ... frequency samples. We develop an alternative approach to predicting the trajectory of length over time using ... from direct measurements of individual pre- and post-moult krill sampled from the wild with a model of ... from the Indian Ocean sector we model IGR as a function of pre-moult length and season using linear ...
Meeting Document : WG-EMM-05/27 : Autor(es): S. Candy and S. Kawaguchi (Australia)
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Oceanography of the South Georgia and South Orkney Islands regions using high-resolution models
ecosystems operate over small spatial scales of <10 km. Understanding the drivers of variability in such ... . Many of the key oceanographic and ecological processes determining the operation of these marine ... processes requires the development of high-resolution ocean models. Here we describe the development of ... the results of preliminary analyses. The models are regional applications of NEMO with a ~3 km ...
Meeting Document : WG-EMM-17/30 : Autor(es): E. Young, E. Murphy and P. Trathan
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High-resolution ocean modelling of the South Georgia and South Orkney Islands regions
South Orkney Islands is highly productive, with a history of commercial exploitation. Many of the key ... oceanographic and ecological processes that determine the structure and functioning of this ecosystem operate ... over small scales of <10 km. Historically, these fine spatial scales have been poorly represented in ... numerical models. Here we describe the development of two regional ocean models that will be used to examine ...
Meeting Document : WG-EMM-16/15 : Autor(es): E. Young, E. Murphy and P. Trathan
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Preliminary assessment of the South Georgia ray populations
implemented in a Bayesian framework. Catch and CPUE data were reconstructed for the time series 1985 – 2006 ... from a variety of sources, and included the consideration that since 2004 the practice of cutting rays ... off lines at the water surface should have increased survivorship of discarded rays, although this ... deeper than 800m, and we have assumed that the majority of catches were of the Amblyraja variant species ...
Meeting Document : WG-SAM-07/11 : Autor(es): D.J. Agnew, R. Mitchell, T. Carruthers, J. Roberts, R. Hillary and J. Pearce (United Kingdom)
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Using production models to assess the stock of Paralomis spinosissima around South Georgia Island
recruitment function. The best fitting model was Model 1. Model 1 had three parameters: an estimate of initial ... abundance (N0), an estimate of the scaling coefficient relating abundance to CPUE (q), and a recruitment ... removals should not be greater than the number of crabs that recruit to the fishery during the course of a ... information about the frequency and duration of the molting/mating event is required. To extrapolate the ...
Meeting Document : WG-FSA-93/23 : Autor(es): George Watters (USA)
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Benthos: Trophic modelling of the Ross Sea
. Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... Description / Abstract: A supporting document to the CCAMLR Science paper: M.H. Pinkerton, J.M ... et al. 2006), large-scale estimates of benthic biomass in the Ross Sea is limited. Sampling methods ... and lack of calibration of numbers to biomass are at the base of difficulties in arriving at ... enough to elucidate the patchiness in the distribution of benthos biomass. Also, it is common for ... structure of the benthic ecosystem used in this study is based on a widely-used but simple energetic model ...
Document : Site Section: Publications
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Whales: Trophic modelling of the Ross Sea
. Bradford-Grieve and S.M. Hanchet. 2010. A balanced model of the food web of the Ross Sea, Antarctica ... Description / Abstract: A supporting document to the CCAMLR Science paper: M.H. Pinkerton, J.M ... higher values of P/B of 0.039 and 0.056 y-1, with a mean of 0.047 y-1 which we use in the modelling for ... population than they contribute to the mean weight of animals in the population. The overall estimate of Q/B ... separate whale trophic compartments. A summary of whale parameters for the Ross Sea is given in Table 1 ... baleen whales in the Ross Sea is 10% of wet weight (0.1 gC/gWW), the same carbon content as fish ...
Document : Site Section: Publications