At-sea distribution of breeding Tristan albatrosses Diomedea dabbenena and potential interactions with pelagic longline fishing in the South Atlantic Ocean

Cuthbert, Richard; Hilton, Geoff M.; Ryan, Peter G.; Tuck, Geoffrey N.

doi:10.1016/j.biocon.2004.05.007

Cited by 50 publications

(42 citation statements)

References 21 publications

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“…Cluster 1 included the species that breed on islands in the subtropics (IYNA and AA) and feed their chicks with prey caught in subtropical oceanic waters, which is in agreement with tracking studies (Pinaud & Weimerskirch 2007). Interestingly, the δ AYNA that breed on Gough Island, which is close to the northern margin of the subantarctic zone, indicates that both species foraged mainly in subtropical oceanic waters, and not in subantarctic waters, which is corroborated by tracking data from TA (Cuthbert et al 2005). Cluster 3 included BBA from Kerguelen, which was the only near-exclusive neritic feeder, with the high δ 13 C typical of the Kerguelen shelf (Cherel et al 2000a,b).…”

Section: Breeding-season Foraging Ecologysupporting

confidence: 79%

Stable isotopes document inter- and intra-specific variation in feeding ecology of nine large southern Procellariiformes

Jaeger¹,

Jaquemet²,

Phillips³

et al. 2013

Mar. Ecol. Prog. Ser.

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Investigating the foraging ecology of seabirds is especially challenging given their wide-ranging movements and the practical difficulties of obtaining unbiased information on their feeding behavior. Despite the development of animal-borne tracking devices, several limitations preclude investigations at the scale of a whole community in a given season or year, and, until recently, during the non-breeding period. Here we analyzed δ 13 C and δ 15 N in feathers of chicks and adults to investigate inter-and intra-specific variation in the foraging habitat and trophic position of 9 large procellariiform seabirds from 6 southern breeding localities during the breeding and non-breeding periods. Isotopic ratios of each species were generally consistent among different breeding populations, despite the large geographical scale and potential variation in oceanography in surrounding waters. Both spatial and trophic segregation apparently allowed the coexistence of sympatric species in most breeding localities, except at South Georgia, where both δ 13 C and δ 15 N in chicks showed high overlap among species, probably resulting from the superabundance of alternative food resources during the summer. Low variance in stable isotope ratios among adults in several species indicated high overlap between individuals in feeding habits and trophic levels (i.e. isotopic specialist populations) during the non-breeding period. By contrast, large isotopic variances and the high within-and between-individual components of the trophic niche width suggested that grey-headed and light-mantled sooty albatrosses are generalists. Based on δ 13 C, the species that breed in the Southern Ocean can be categorized as residents or subtropical migrants, with the latter including oceanic and neritic subtropical migrants. Albatrosses meet the high energetic challenge of feather synthesis by foraging in different habitats, depending on the length of the non-breeding period. Annual breeders renew their plumage in productive neritic waters in ~4 mo, whereas biennially breeding species moult in less productive oceanic waters over much longer periods (~12 to 16 mo).

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Section: Breeding-season Foraging Ecologysupporting

confidence: 79%

Stable isotopes document inter- and intra-specific variation in feeding ecology of nine large southern Procellariiformes

Jaeger¹,

Jaquemet²,

Phillips³

et al. 2013

Mar. Ecol. Prog. Ser.

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“…For instance, mortality from fishing gear has been blamed for population declines in several endangered seabird species in the waters of the Southern Ocean (e.g. wandering albatross Diomedea exulans, Cherel & Weimerskirch 1996; white-chinned petrel Procellaria aequinoctialis, Weimerskirch et al 1999; grey-headed albatross Thalassarche chrysostoma, Nel et al 2000; Tristan albatross Diomedea dabbenena, Cuthbert et al 2005). Indeed, in these areas where long-lining is a dominant fishing method very low or no resource overlap was predicted in our study (Fig.…”

Section: Resource Overlap Between Fisheries and Seabirdsmentioning

confidence: 99%

Modelling and mapping resource overlap between seabirds and fisheries on a global scale: a preliminary assessment

Karpouzi¹,

Watson²,

Pauly³

2007

Mar. Ecol. Prog. Ser.

109

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Coexistence of foraging seabirds and operating fisheries may result in interactions such as competition for the same prey resources. We used GIS-based modelling at a scale of 0.5 × 0.5°spa-tial cells to: (1) map the foraging distribution of seabirds; (2) predict their annual food consumption rates in a spatially explicit manner; and (3) estimate a spatially explicit seabird -fisheries overlap index. Information on population size, diet composition and foraging attributes of 351 seabird species was compiled into a Microsoft Access database. Global annual food consumption by seabirds was estimated to be 96.4 million tonnes (95% CI: 78.0 to 114.7 million tonnes), compared with a total catch of nearly 120 million tonnes by all marine fisheries. Krill and cephalopods comprised over 58% of the overall food consumed and fish most of the remainder. The families Procellariidae (albatrosses, petrels, shearwaters) and Spheniscidae (penguins) were responsible for over 54% of the overall food consumption. Seabird foraging distribution maps revealed that areas around New Zealand, the eastern Australian coast, and the sub-Antarctic islands had high species richness. However, temperate and polar regions supported high seabird densities and most food extracted by seabirds originated there. Furthermore, maps of food consumption rates revealed that most food consumed by seabirds was extracted from offshore rather than nearshore waters and from areas where seabird -fisheries overlap was low. The resource overlap maps identified 'hotspots' of highest potential for conflict between fisheries and seabirds. Thus, this study may provide useful insight when developing management approaches for designing offshore marine conservation areas. KEY WORDS: Seabird -fisheries interactions · Resource overlap · Foraging distribution · Seabird food consumptionResale or republication not permitted without written consent of the publisher

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“…Wandering and Tristan albatrosses breed in South Georgia and Tristan da Cunha, respectively, and both breeding and nonbreeding birds use the southwest Atlantic; Wandering albatrosses forage over an extensive region from oceanic waters to the shelf break, whereas Tristan albatrosses forage almost exclusively in oceanic waters in the subtropical region (Nicholls et al 2002;Cuthbert et al 2005;Reid et al 2013). The reported plastic accumulation area for the subtropical south Atlantic gyre (Cózar et al 2014;Ryan 2014) matches very well with the distribution of Tristan albatross, at least during breeding, suggesting a greater susceptibility in this species to plastic ingestion.…”

Section: Discussionmentioning

confidence: 99%

Marine debris ingestion by albatrosses in the southwest Atlantic Ocean

Jiménez

Domingo²,

Brazeiro

et al. 2015

Marine Pollution Bulletin

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Plastics and other marine debris affect wildlife through entanglement and by ingestion. We assessed the ingestion of marine debris by seven albatross species in the southwest Atlantic by analysing stomach contents of birds killed in fisheries. Of the 128 specimens examined, including four Diomedea species (n=78) and three Thalassarche species (n=50), 21 (16.4%) contained 1-4 debris items, mainly in the ventriculus. The most common type was plastic fragments. Debris was most frequent in Diomedea species (25.6%) and, particularly, D. sanfordi (38.9%) and very rare in Thalassarche species (2.0%), presumably reflecting differences in foraging behavior or distribution. Frequency of occurrence was significantly higher in male than female Diomedea albatrosses (39.3% vs. 18.0%). Although levels of accumulated debris were relatively low overall, and unlikely to result in gut blockage, associated toxins might nevertheless represent a health risk for Diomedea albatrosses, compounding the negative impact of other human activities on these threatened species.

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At-sea distribution of breeding Tristan albatrosses Diomedea dabbenena and potential interactions with pelagic longline fishing in the South Atlantic Ocean

Cited by 50 publications

References 21 publications

Stable isotopes document inter- and intra-specific variation in feeding ecology of nine large southern Procellariiformes

Stable isotopes document inter- and intra-specific variation in feeding ecology of nine large southern Procellariiformes

Modelling and mapping resource overlap between seabirds and fisheries on a global scale: a preliminary assessment

Marine debris ingestion by albatrosses in the southwest Atlantic Ocean

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