Resultados de la búsqueda

1. Environmental variability and the behavioural dynamics of Antarctic fur seals in the South Atlantic

   environmental variation. In a multiple regression analysis, the El Niño/southern oscillation index (ENSO) and a ... Abstract:  Variability in the reproductive performance of marine predators may be a result of ... physical forcing by large-scale oceanographic variability. Time lags, remoteness from the epicentre of a ... climate variation. Fur seal foraging trip duration was transformed into a normally distributed index of ...

   Meeting Document : WS-AREA 48-98/16 : Autor(es): I.L. Boyd (UK)

2. Direct ageing of Antarctic krill (Euphausia superba) – potential utility of eyestalk sections for age determination

   Abstract:  We outline a method for the direct determination of age in Antarctic krill (Euphausia ... superba). Recent studies (Kilada et al. 2012), have shown that annular growth bands are present in the ... endocuticle layer of the eyestalks and gastric mill in decapod crustaceans. Here we report on a preliminary ... Antarctic Division and examined using the methods outlined in (Kilada et al. 2012). Two analyses are ...

   Meeting Document : WG-EMM-15/45 : Autor(es): C. Reiss (USA), R. Kilada (Canada) and S. Kawaguchi (Australia)

3. Trends of Antarctic fur seal population at SSSI No. 32, Livingston Island, South Shetlands, Antarctica

   had to model the population at the latter site, in order to have a complete estimate of the population ... . From this, we estimated an overall increase of 17% in the total population, including in this figure a ... , and the scattered historical data. Further evidence that the breeding population of A. gazella is ... affected by the El Niño Southern Oscillation phenomena might be given by the intrinsic rate of population ...

   Meeting Document : WG-EMM-99/16 : Autor(es): R. Hucke-Gaete, D. Torres, A. Aguayo, J. Acevedo and V. Vallejos (Chile)

4. Population, breeding, diet and conservation of Crozet shag Phalacrocorax [atriceps] melanogenis at Marion Island, 1994/95 to 2002/03

   25% of the mature population did not breed in 1997/98, coincident with a strong El Niño Southern ... birds breeding in any given season. The decreases coincided with a period of warming and reduced ... precipitation at Marion Island and with a decrease in the number of gentoo penguins Pygoscelis papua breeding ... , but a change in dominance among nototheniid prey suggests availability of prey to shags changed after ...

   Meeting Document : WG-EMM-03/17 : Autor(es): R.J.M. Crawford, J. Cooper, B.M. Dyer, A.C. Wolfaardt, D. Tshingana, K. Spencer, S.L. Petersen, J.L. Nel, D.G. Keith, C.L. Holness, B. Hanise, M.D. Greyling and M. du Toit (South Africa)

5. Coastal weather drives foraging behaviour of chinstrap penguins, Pygoscelis antarctica

   ) supports huge predator populations as well as a growing commercial fishery.  To utilize information from ... indices of krill predators have been proposed as a proxy for krill abundance.  However, there are several ... context, our study capitalises on the occurrence of an unexpected El Niño event to characterise how ... environmental variability can drive changes in predator foraging behaviour. We demonstrate a clear link between ...

   Meeting Document : WG-EMM-18/P14 : Autor(es): A.D. Lowther, P. Trathan, A. Tarroux, C. Lydersen and K.M. Kovacs

6. Using predators and their prey to characterise the status of the marine ecosystem at South Georgia

   patchiness is probably a more important determinant of foraging success than density per se; (iv) previously ... krill densities. We suggest that a programme of work is needed to better characterise predator ...

   Meeting Document : WG-EMM-16/28 : Autor(es): P. Trathan, S. Fielding, S. Hill, M. Belchier and J. Forcada

7. Temporal variability in Antarctic marine ecosystems: periodic fluctuations in the phocid seals

   behavior when demodulated at a period of 5 yr. The Weddell seals were generally in phase with the SOI since ... thereafter the SOI series led the leopard seal series by about one quarter of a cycle. The crabeater series ... observations are confirmed, they point to large-scale oceanographic variation, possibly related to the El Niño ...

   Meeting Document : WG-CEMP-91/13 : Autor(es): J.W. Testa, G. Oehlert, D.G. Ainley, J.L. Bengtson, D.B. Siniff, R.M. Laws and D. Rounsevell (USA)

8. Unhappy feet: the reduction of Adélie and chinstrap penguin populations in the West Antarctic Peninsula/Scotia Sea

   Abstract:  New and alarming evidence has been published by Trivelpiece et al. recently about the ... . Trivelpiece et al. argue that the reduction of the populations of both species could be attributed to changes ... context, CCAMLR should keep a precautionary approach in the management of the krill fishery to reduce ...

   Meeting Document : CCAMLR-XXX/BG/21 : Autor(es): Submitted by ASOC

9. Discussion on recent results from an integrated assessment of Antarctic krill (Euphausia superba) in Subarea 48.1

   Abstract:  This is a companion paper to Kinzey et al. (2014), who extended the integrated stock ... and estimate krill growth.  Kinzey et al. (2014) fitted stock-assessment models to survey data that ... from three of the models provide a robust picture of changes in the krill population.  An annual model ... surveys estimated similar absolute biomasses and changes in biomass.  A seasonal model estimated similar ...

   Meeting Document : WG-EMM-14/35 : Autor(es): G.M. Watters, C.S. Reiss and D. Kinzey (USA)

10. Population of macaroni penguins Eudyptes chrysolophus at Marion Island, 1994/95 to 2002/03, with information on breeding and diet

    correlated. Both showed a marked decrease in 1998/99, after the El Niño of 1997/98. In most seasons from 1994 ... demonstration of a significant decrease in the overall population. Numbers of occupied nests at other colonies ... decreased from 79 000 in 1994/95 to 31 000 in 2002/03. At three small colonies there was a significant ... . However, during this period there was a significant increase in reproductive success with time. In the ...

    Meeting Document : WG-EMM-03/15 : Autor(es): R.J.M. Crawford, J. Cooper and B.M. Dyer (South Africa)

Páginas