Foraging ecology and interactions with fisheries of wandering albatrosses (<i>Diomedea exulans</i>) breeding at South Georgia

Xavier, J. C.; Trathan, Philip N.; Croxall, John P.; Wood, Andrew G.; Podestá, Guillermo; Rodhouse, P. G.

doi:10.1111/j.1365-2419.2004.00298.x

Cited by 91 publications

(134 citation statements)

References 32 publications

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“…This is consistent with the tendency of top predators to 436 target oceanic fronts, potentially to catch squid (Rodhouse et al, 1996;Xavier et al, 2004). 437…”

Section: Xavier and Cherel 2009) 434supporting

confidence: 64%

Biogeography of Cephalopods in the Southern Ocean Using Habitat Suitability Prediction Models

et al. 2015

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20Our understanding of how environmental change in the Southern Ocean will affect marine 21 diversity, habitats, and distribution remain limited. The habitats and distributions of Southern 22Ocean cephalopods are generally poorly understood, and yet such knowledge is necessary for 23 research and conservation management purposes, as well as for assessing the potential 24 impacts of environmental change. We used net-catch data to develop habitat suitability 25 models for 15 of the most common cephalopods in the Southern Ocean. Using modelled 26 habitat suitability, we assessed favourable areas for each species and examined the 27 relationships between species distribution and environmental parameters. The results 28 compared favourably with the known ecology of these species and with spatial patterns from 29 diet studies of squid predators. The individual habitat suitability models were overlaid to 30 generate a "hotspot" index of species richness, which showed higher numbers of squid 31 species associated with various fronts of the Antarctic circumpolar current. Finally, we 32 reviewed the overall distribution of these species and their importance in the diet of Southern 33Ocean predators. There is a need for further studies to explore the potential impacts of future 34 climate change on Southern Ocean squid.

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“…This is consistent with the tendency of top predators to 436 target oceanic fronts, potentially to catch squid (Rodhouse et al, 1996;Xavier et al, 2004). 437…”

Section: Xavier and Cherel 2009) 434supporting

confidence: 64%

Biogeography of Cephalopods in the Southern Ocean Using Habitat Suitability Prediction Models

et al. 2015

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“…Whatever the relationship, fishing vessel distribution needs to be taken into account. Most studies so far have examined this issue at coarse spatial and temporal scales (Xavier et al, 2004;Phillips et al, 2006;Weimerskirch et al, 2010, but see Peterson et al, 2008;Votier et al, 2010;Granadeiro et al, 2011 for important exceptions) and more work is needed in this area.…”

Section: Introductionmentioning

confidence: 99%

Predicting the distribution of a threatened albatross: The importance of competition, fisheries and annual variability

Catry

Lemos

Brickle

et al. 2013

Progress in Oceanography

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a b s t r a c tThe ability to predict the distribution of threatened marine predators is essential to inform spatially explicit seascape management. We tracked 99 individual black-browed albatrosses Thalassarche melanophris from two Falkland Islands' colonies in 2 years. We modeled the observed distribution of foraging activity taking environmental variables, fisheries activity (derived from vessel monitoring system data), accessibility to feeding grounds and intra-specific competition into account. The resulting models had sufficient generality to make reasonable predictions for different years and colonies, which allows temporal and spatial variation to be incorporated into the decision making process by managers for regions and seasons where available information is incomplete. We also illustrated that long-ranging birds from colonies separated by as little as 75 km can show important spatial segregation at sea, invalidating direct or uncorrected extrapolation from one colony to neighboring ones. Fisheries had limited influence on albatross distribution, despite the well known scavenging behavior of these birds. The models developed here have potentially wide application to the identification of sensitive geographical areas where special management practices (such as fisheries closures) could be implemented, and would predict how these areas are likely to move with annual and seasonal changes in environmental conditions.

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“…In the present study, we investigated the cephalopod fauna of the south Atlantic and Indian sectors of the Southern Ocean using diet samples collected from wan dering albatrosses (Diomedea exulans) breeding at South Georgia, Crozet and Kerguelen islands. The wandering albatross feeds on a large variety of ce phalopod species on long foraging trips that during the chick rearing period range from Antarctic to subtropical waters (between 25−64°S and about 2800 km from their colonies) (Imber 1992, Weimerskirch et al 1993, Xavier et al 2004. Their patchily-distributed prey are thought to include primarily dead and moribund cephalopods that have floated to the surface post-spawning (Croxall & Prince 1994, Cherel & Weimerskirch 1999, Xavier et al 2003b.…”

Section: Introductionmentioning

confidence: 99%

Habitat and trophic ecology of Southern Ocean cephalopods from stable isotope analyses

Guerreiro¹,

Phillips²,

Cherel³

et al. 2015

Mar. Ecol. Prog. Ser.

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Although cephalopods play a critical role in marine food webs both as predators and prey, there is a limited knowledge of several basic aspects of their ecology, including their habitat and trophic level, in the Southern Ocean. We examined the ecological role of several Southern Ocean cephalopod species by analyzing δ N values were more variable among species, ranging from 2.4 to 13.3 ‰, a difference of ~11 ‰ that represents approx. 3 trophic levels. Differences among islands in isotope ratios in the same cephalopod species (higher δ 15 N and lower δ 13 C values in South Georgia) were attributed to regional oceanographic processes. Antarctic cephalopods occupy niches similar to those found in some pelagic fish, seabirds and marine mammals. As cephalopods are key components in Southern Ocean food webs, these results greatly advance our understanding of the structure, energy and carbon flows in this polar ecosystem.

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Foraging ecology and interactions with fisheries of wandering albatrosses (Diomedea exulans) breeding at South Georgia

Abstract: Knowledge about the areas used by the foraging wandering albatross, Diomedea exulans, its prey and overlap with longline fisheries is important information not only for the conservation of this species but also for furthering our understanding of the ecology of its prey.

Cited by 91 publications

References 32 publications

Biogeography of Cephalopods in the Southern Ocean Using Habitat Suitability Prediction Models

Biogeography of Cephalopods in the Southern Ocean Using Habitat Suitability Prediction Models

Predicting the distribution of a threatened albatross: The importance of competition, fisheries and annual variability

Habitat and trophic ecology of Southern Ocean cephalopods from stable isotope analyses

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