Vagrant Antarctic fur seals at Gough Island in 2009

Bester, Marthán N; Reisinger, Ryan R

doi:10.1007/s00300-009-0749-4

Cited by 12 publications

(8 citation statements)

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“…Antarctic fur seals Arctocephalus gazella mainly breed at localities south of the Antarctic Polar Front, but have successfully colonised some sub-Antarctic islands north of this Front (Condy 1978;Bester 1984), where they are largely replaced by the Subantarctic fur seal A. tropicalis. Vagrant Antarctic fur seals occasionally occur farther north (Acevedo et al 2011), reaching Gough Island (40°S, 10°W) in the central South Atlantic Ocean (Wilson et al 2005;Bester and Reisinger 2010), and we report a further range extension in this region.…”

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confidence: 58%

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Vagrant Antarctic fur seals at the Tristan da Cunha Islands

et al. 2014

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confidence: 58%

“…2b). Despite the 5day lapse between the sightings at TdC and 380 km distant Gough Island (GI), where it was seen in the same area as previous sightings (Wilson et al 2006;Bester and Reisinger 2010), it is impossible to say whether it is the same animal.…”

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confidence: 97%

Vagrant Antarctic fur seals at the Tristan da Cunha Islands

et al. 2014

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“…The subantarctic fur seal Arctocephalus tropicalis suffered severe population reductions and local extinctions due to commercial exploitation. After sealing, pronounced population expansions and recolonization of historical sites, and probable colonization of new breeding sites occurred (Wynen et al 2001), and the species was found outside its range in South America, Angola, New Zealand, Australia, South Africa and on several islands (for a review, see Bester & Reisinger 2010). Ferreira et al (2008) analysed mtDNA control region sequences from vagrant subantarctic fur seals found on the Brazilian coast and from animals from the main breeding colonies.…”

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confidence: 99%

“…After sealing, pronounced population expansions and recolonization of historical sites, and probable colonization of new breeding sites occurred (Wynen et al. 2001), and the species was found outside its range in South America, Angola, New Zealand, Australia, South Africa and on several islands (for a review, see Bester & Reisinger 2010). Ferreira et al.…”

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confidence: 99%

Conservation genetics of South American aquatic mammals: an overview of gene diversity, population structure, phylogeography, non‐invasive methods and forensics

Oliveira¹,

Castro²,

Cárdenas‐Alayza³

et al. 2011

Mammal Review

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Most aquatic mammals have high dispersal potential, and there are often severe conservation concerns related to their legal or illegal harvesting. Therefore, economic, social and forensic factors often arise in decisions relating to their population management. Molecular markers are essential tools in modern conservation genetics, revealing previously unknown aspects of aquatic mammal behaviour, natural history, population structure and demography. Molecular markers also have been used to define management units, to recognize taxonomic units, to conduct forensic analyses and to control illegal wildlife trade, providing valuable information for decision‐making in wildlife conservation and management. We review studies published in peer‐reviewed journals between 1993 and 2010, in which genetic approaches have been applied to conservation‐related issues involving natural populations of 25 species of aquatic mammals in South America. These studies cover just 34% of the 70 aquatic mammal species recorded in South America. Most of the studies are related to population structure, phylogeography, gene flow and dispersal movements. In addition, recent findings relate to evolutionarily significant units, management units, forensics and conservation policy. Finally, we look to the future and, based on numbers of studies and conservation concerns, suggest which species, geographic areas and genetic studies should be prioritized. Moreover, we discuss constraints on research and suggest collaborative works that would provide critical information towards the effective conservation and management of aquatic mammals in South America.

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“…For example, some AFS populations are declining in part of their distribution range (Forcada and Hoffman ), but not elsewhere. Fur seals are able to travel extensive distances ( e.g ., Bester and Reisinger , Bester et al . ) and settle at new rookeries (Wynen et al .…”

Section: Resultsmentioning

confidence: 99%

Trend changes in sympatric Subantarctic and Antarctic fur seal pup populations at Marion Island, Southern Ocean

Wege

Étienne

Oosthuizen

et al. 2016

Marine Mammal Science

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Abstract:Recent pup population estimates of sympatric Subantarctic (Arctocephalus tropicalis) and Antarctic fur seals (A. gazella) at Marion Island are presented. Published pup population estimates of A. tropicalis (1995 and 2004) with an unpublished total island count in 2013, and annual counts on subsets of rookeries (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015) were analyzed using a Hierarchical Bayesian model. The pup population declined by 46% (95% credible interval [CI]: 43%-48%) between 2004 (mean=15,260, CI:14,447-16,169 pups) and 2013 (mean=8,312, CI: 7,983-8,697), mirrored by a 58%-60% decline at beaches counted annually (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015).Population decline was highest at high-density west and north coast rookeries, despite negligible change in female attendance patterns, pup mortality or median pupping date over the previous 25 yr. However, a better understanding of foraging behavior and its effects on reproductive success and survival in this A. tropicalis population is needed before we can attribute population decline to any external factors. In contrast, total island counts of A. gazella pups in 2007, 2010, and 2013, suggest that this population is still increasing although the annual intrinsic rate of population growth decreased from 17.0% (1995-2004; 744 pups) to 4.0% (2010-2013; 1,553 pups). The slowed growth of A. gazella is likely the result of saturation at the main rookery.

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Vagrant Antarctic fur seals at Gough Island in 2009

Cited by 12 publications

References 12 publications

Vagrant Antarctic fur seals at the Tristan da Cunha Islands

Vagrant Antarctic fur seals at the Tristan da Cunha Islands

Conservation genetics of South American aquatic mammals: an overview of gene diversity, population structure, phylogeography, non‐invasive methods and forensics

Trend changes in sympatric Subantarctic and Antarctic fur seal pup populations at Marion Island, Southern Ocean

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