Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing

@article{Forcada2012ResponsesOA,
  title={Responses of Antarctic pack-ice seals to environmental change and increasing krill fishing},
  author={Jaume Forcada and Philip N Trathan and Peter L. Boveng and Ian L. Boyd and Jennifer M. Burns and Daniel P. Costa and Michael A. Fedak and Tracey L. Rogers and Colin Southwell},
  journal={Biological Conservation},
  year={2012},
  volume={149},
  pages={40-50}
}
The compound effects of changing habitats, ecosystem interactions, and fishing practices have implications for the management of Antarctic krill and conservation of its predators. For Antarctic pack-ice seals, an important group of krill predators, we estimate the density and krill consumption in the West Antarctic Peninsula (WAP)–Western Weddell Sea area, the main fishery region; and we consider long-term changes in suitable pack-ice habitat, increased fishing pressure and potential krill… Expand

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References

SHOWING 1-10 OF 102 REFERENCES
Variability in krill biomass links harvesting and climate warming to penguin population changes in Antarctica
TLDR
This work argues in favor of an alternative, more robust hypothesis that attributes both increases and decreases in penguin populations to changes in the abundance of their main prey, Antarctic krill. Expand
Direct effects of climate change on the Antarctic krill fishery
TLDR
Declining sea ice cover in the main krill fishing grounds has resulted in greater accessibility of krill stocks to the fishing fleets, particularly during winter, and this change in fishing behaviour will need careful management in an era of rapid ecological change. Expand
Taking account of dependent species in management of the Southern Ocean krill fishery: estimating crabeater seal abundance off east Antarctica
Summary 1. The crabeater seal Lobodon carcinophaga is considered to be a key species in the krill-based foodweb of the Southern Ocean. Reliable estimates of the abundance of this species areExpand
Distribution, density, and abundance of pack-ice seals in the Amundsen and Ross Seas, Antarctica
Abstract We made three sets of population surveys of the four species of ice-inhabiting phocid pinnipeds in the Ross and Amundsen Seas between 26 December 1999 and 24 March 2000 using icebreakers andExpand
Life history buffering in Antarctic mammals and birds against changing patterns of climate and environmental variation
TLDR
It is found that among birds and mammals of different Antarctic regions, including emperor penguins, snow petrels, southern fulmars, Antarctic fur seals and Weddell seals, there is strong support for selection of life history traits that reduce interannual variation in fitness. Expand
Long-term decline in krill stock and increase in salps within the Southern Ocean
TLDR
This database shows that the productive southwest Atlantic sector contains >50% of Southern Ocean krill stocks, but here their density has declined since the 1970s, and salps appear to have increased in the southern part of their range. Expand
Climate change and the marine ecosystem of the western Antarctic Peninsula
TLDR
Of the changes observed in the marine ecosystem of the western Antarctic Peninsula (WAP) region to date, alterations in winter sea ice dynamics are the most likely to have had a direct impact on the marine fauna, principally through shifts in the extent and timing of habitat for ice-associated biota. Expand
Winter habitat use and foraging behavior of crabeater seals along the Western Antarctic Peninsula
We quantified the winter and spring movement patterns and foraging behavior of adult crabeater seals (Lobodon carcinophagus), and the influence of sea ice and bathymetry on their foraging behavior.Expand
Predicting the distribution of crabeater seals Lobodon carcinophaga off east Antarctica during the breeding season
Predictive species-environment models have numerous ecological and management applications, and can provide insight into the functional relationships between a species and its envi- ronment.Expand
A compilation of parameters for ecosystem dynamics models of the Scotia Sea-Antarctic Peninsula region
TLDR
The results suggest that fish are the major krill consumers in all SSMUs, with perciform fish taking as much krill as whales, penguins and fur seals combined and myctophid fish taking double that amount. Expand
...
1
2
3
4
5
...