Antarctic Fur Seal (Arctocephalus gazella, Peters 1875)

Forcada, Jaume

doi:10.1007/978-3-030-63177-2_4

Cited by 2 publications

(4 citation statements)

References 129 publications

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“…results presented in recent studies (Bonin et al 2013, Humble et al 2018, Cleary et al 2019, Paijmans et al 2020, and summarised by Forcada (2021) and , confirmed that Arctocephalus gazella consists of at least four distinct subpopulations: 1) South Shetland Islands (SSI), 2) South Georgia, 3) Bouvetøya, and 4) the eastern sub-Antarctic islands in the Indian Ocean (Fig. 1).…”

Section: Introductionsupporting

confidence: 66%

“…The Red List Assessment for AFS by the IUCN is out dated for all breeding centres, and should be revised as soon as is practicable at the subpopulation level (Forcada 2021, Krause et al 2022). Finally, habitats used by SSAFS are included under the Western Antarctic Peninsula and Islands Important Marine Mammal Area (IMMA) by the IUCN Marine Mammal Protected Areas Task Force (MMPTF 2023).…”

Section: Discussionmentioning

confidence: 99%

“…The Red List Assessment for AFS by the IUCN is out dated for all breeding centres, and should be revised as soon as is practicable at the subpopulation level (Forcada 2021. (MMPTF 2023).…”

Section: Current Conservation Effortsmentioning

confidence: 99%

“…Until recently, the AFS population was considered to be circumpolar, panmictic, stable, and mainly derived from a post‐exploitation recovery on South Georgia (summarised in Hofmeyr 2016). However, substantial geographical, historical, morphological, and genetic results presented in recent studies (Bonin et al 2013, Humble et al 2018, Cleary et al 2019, Paijmans et al 2020), and summarised by Forcada (2021) and Krause et al (2022), confirmed that Arctocephalus gazella consists of at least four distinct subpopulations: 1) South Shetland Islands (SSI), 2) South Georgia, 3) Bouvetøya, and 4) the eastern sub‐Antarctic islands in the Indian Ocean (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Evaluating threats to South Shetland Antarctic fur seals amidst population collapse

Krause,

Brownell,

Bonin

et al. 2023

Mammal Review

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Antarctic fur seals (Arctocephalus gazella) are an iconic marine mammal, an important component of Antarctic ecosystems, and a key indicator species for regional fisheries management. Recent studies have demonstrated Arctocephalus gazella is composed of at least four distinct subpopulations, including one breeding on the South Shetland Islands. These South Shetland Antarctic fur seals (SSAFS) are the highest latitude population of otariids in the world. As such, this subpopulation faces a unique array of environmental and ecological challenges, harbours a disproportionately large reservoir of genetic diversity for the species, and has experienced catastrophic population decline in the last 15 years (2008–2023). We review the array of current and potential threats to the successful recovery of SSAFS. If decision makers wish to promote resilience and support a robust population of this species with future recovery potential, actions are needed to address threats ranging from uncertain to critical, including debris entanglement, climate change, incidental mortality, and resource competition with the krill fishery. In particular, the risks associated with overlap in the spatial and temporal distribution of the young of the year and the krill fishery should be addressed carefully. There is an urgent need for updated population estimates for all Antarctic fur seal subpopulations, analysis on the population viability of the SSAFS, and further characterising summer and winter foraging behaviours to better inform potential conservation actions.

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Section: Introductionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

“…The Red List Assessment for AFS by the IUCN is out dated for all breeding centres, and should be revised as soon as is practicable at the subpopulation level (Forcada 2021. (MMPTF 2023).…”

Section: Current Conservation Effortsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluating threats to South Shetland Antarctic fur seals amidst population collapse

Krause,

Brownell,

Bonin

et al. 2023

Mammal Review

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Ecosystem shifts inferred from long-term stable isotope analysis of male Antarctic fur seal Arctocephalus gazella teeth

Lima

Cebuhar

Negrete

et al. 2022

Mar. Ecol. Prog. Ser.

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The Atlantic sector of the Southern Ocean has been rapidly changing over the last century. Many of those changes are driven by climate anomalies such as the El Niño-Southern Oscillation and the Southern Annular Mode, which affect biological processes that scale up the food web. We used δ13C and δ15N time series of dentine growth layer groups (as a proxy of individual foraging history from multiple years, n = 41 teeth) to assess temporal shifts in foraging habits of subadult/adult male Antarctic fur seals Arctocephalus gazella (AFSs) in 2 areas of high concentration of Antarctic krill Euphausia superba: the South Shetland Islands and the South Orkney Islands. Our analyses, which represent the first long-term isotopic assessment of male AFS sampled in Antarctic waters, revealed a significant decrease of δ13C (0.04‰ yr-1) from 1974 to 2015 and a decrease of δ15N after the late 1990s. The observed changes are likely driven by shifts in latitudinal and longitudinal distribution of krill and increased incorporation of 15N-enriched sources (higher trophic level prey and/or feeding in different areas) in the most recent period for reasons that are not yet clear. We were able to trace ecosystem changes through isotopic bio-archives of Antarctic fur seals, highlighting the role of this species as an ecosystem indicator of the trophic cascade effects caused by climate change in the Southern Ocean.

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Antarctic Fur Seal (Arctocephalus gazella, Peters 1875)

Cited by 2 publications

References 129 publications

Evaluating threats to South Shetland Antarctic fur seals amidst population collapse

Evaluating threats to South Shetland Antarctic fur seals amidst population collapse

Ecosystem shifts inferred from long-term stable isotope analysis of male Antarctic fur seal Arctocephalus gazella teeth

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