Multiple origins of vagrant Subantarctic fur seals: a long journey to the Brazilian coast detected by molecular markers

Ferreira, Juliana Machado; Oliveira, Larissa Rosa de; Wynen, Louise P.; Bester, Marthán N; Guinet, Christophe; Moraes‐Barros, Nadia; Martins, Fernando; Muelbert, Mônica M. C.; Moreno, Ignacio B.; Siciliano, Salvatore; Ott, Paulo Henrique; Morgante, João Stenghel

doi:10.1007/s00300-007-0358-z

Cited by 32 publications

(22 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to a study of the genetic variability in subantarctic fur seals encountered on southern Brazilian beaches, the vagrant specimens were derived from three reproductive colonies: Gough Island; Amsterdam Island; and the islands of Marion, Crozet and Macquarie (Ferreira et al, 2008). These vagrant individuals thus strayed widely off course before arriving on the Brazilian coast.…”

Section: Discussionmentioning

confidence: 99%

Analysis of subantarctic fur seal ( Arctocephalus tropicalis) records in Bahia and Sergipe, north-eastern Brazil

Velozo¹,

Schiavetti

Dórea-Reis³

2009

Mar. Biodivers. Rec.

View full text Add to dashboard Cite

The subantarctic fur seal Arctocephalus tropicalis is widely distributed north of the Antarctic convergence. We analysed data concerning vagrant individuals of A. tropicalis encountered on the beaches of Bahia and Sergipe, north-eastern Brazil, using the Instituto Mamíferos Aquáticos database of occurrences reported between 20 July 1990 and 18 August 2005. The information collected for each case included: date, location of the occurrence, condition of the individual, sex, and total length. Twelve occurrences of A. tropicalis were reported in the study area, with 42% corresponding to sub-adult specimens. All individuals were found alive, but only two were in good health. Most occurrences were reported during the months of July, August and September, a period in which south-eastern winds predominate. The importance of developing public educational campaigns as well as population dynamics studies of this species is discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

Analysis of subantarctic fur seal ( Arctocephalus tropicalis) records in Bahia and Sergipe, north-eastern Brazil

Velozo¹,

Schiavetti

Dórea-Reis³

2009

Mar. Biodivers. Rec.

View full text Add to dashboard Cite

show abstract

“…Such results are therefore not representative of the whole diet of the far-ranging elephant seals in particular, and investigations using this technique were discontinued. Genetic profiling of the fur seal populations (Wynen et al 2000, Maboko et al 2007) and the elephant seal population (Chauke 2008) is underway, and provide additional information of long-range movements (de Bruyn et al 2007, Chauke 2008, Ferreira et al 2008, apart from tracking Bester 19998, de Bruyn et al 2009b, Tosh 2010) and tag recoveries (Bester 1989, Reisinger and.…”

Section: Current Research Focusmentioning

confidence: 99%

The Marine Mammal Programme at the Prince Edward Islands: 38 years of research

Bester

Bruyn²,

Oosthuizen³

et al. 2011

African Journal of Marine Science

View full text Add to dashboard Cite

The Marine Mammal Programme (MMP) conducts research on pinnipeds and killer whales at Marion Island, Prince Edward Islands, under the auspices of the Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria. The early history of the MMP is described, emphasizing the contributions in subsequent years, ending with current research. The setting up of long-term studies such as the mark-resighting of southern elephant seals Mirounga leonina was implemented in 1983. The varying fates of the three seal populations are described, with the Marion Island elephant seal population declining by 87% from 1951 to 2004, followed by a change in growth rate in 1997 and a current increase. Sympatric populations of Subantarctic fur seals Arctocephalus tropicalis and Antarctic fur seals A. gazella breed at Marion Island and the recovery (following cessation of commercial sealing) and subsequent rapid increase of these populations are documented. Insights into many aspects of elephant seal and fur seal biology, including life-history, demography, diet, growth, foraging and ranging behaviour are described.Ancillary work on morphology, genetics, anthropogenic influences and rare events are mentioned, as well as the extent of current research that addresses population dynamics in an ecosystem context, i.e. to relate survival, fecundity and foraging success to environmental conditions. Presently, the response of the populations to increased abundance is gauged and investigations into the foraging ecology, maternal provisioning and diet of both fur seal populations reflect changes in the environment. Opportunistic, land-based photographic identification of killer whales (Orcinus orca) provide baseline population size, seasonal abundance and sociality data for the Marion Island population. Recent dedicated observations are used to quantify observer effort, improve sighting rates and to further our understanding of the 3 potential impact of the killer whale population on resident pinniped populations. The MMP benefits from collaboration with leading national and international researchers. The programme has a long track record of training postgraduate students, as evidenced by the reference list to the manuscript. Their endeavours in the field and completion of postgraduate studies make them ideal candidates to contribute to marine mammal science in South Africa. October 1951-April 1952 published the first scientific papers on the seals of the island (Rand 1955(Rand , 1956(Rand , 1962, followed by Le Grange (1962) (Condy et al. 1978) was elaborated on in an opportunistic fashion (Keith et al. 2001). Throughout, personnel were also alert to seal vagrants (Kerley 1983a) or transients hauling out, sightings of cetaceans (Condy and Burger 1975, Ryan and Bester 2008, fur seal females successfully rearing twin pups Kerley 5 1983, de Bruyn et al. 2010) and extraordinary leucistic individuals (de Bruyn et al. 2007, Reisinger et al. 2009). Terrestrial feeding events by fur seals (Hofmeyr and Bester 1993, ...

show abstract

“…The intrusion of the Falkland/Malvinas Current appear to have an important role in the dispersal of the subantarctic fur seals as well as Antarctic fur seals found along the South American coast (Oliveira et al, 2001a), as shown in this paper. A recent genetic study comparing the A. tropicalis found on the Brazilian coast with animals from the main breeding colonies of this species indicated that despite the majority of the vagrants being from Gough Islands (40°20´S, 09°54´E), they could also come from other reproductive colonies (Ferreira et al, 2007). Furthermore, one vagrant individual which presented a DNA sequence matching an exclusive haplotype from the Crozet Islands (45°95´S, 50°33´E), probably moved west with assistance of the West Wind Drift, around the Antarctic and Falkland/Malvinas currents, reaching the Brazilian coast after covering a distance of about 16500Km.…”

Section: Introductionmentioning

confidence: 99%

Straggler subantarctic fur seal (<i>Arctocephalus tropicalis</i>) on the coast of Rio de Janeiro State, Brazil

Moura¹,

Siciliano²

2007

Lat. Am. J. Aquat. Mamm.

View full text Add to dashboard Cite

Eighteen specimens of subantarctic fur seals (Arctocephalus tropicalis) were recorded along the coast of Rio de Janeiro state in the period 1994-2006. Of these, 55.5% (n=10) were males, 11.1% (n=2) were females, and 33.3% (n=6) were of undetermined sex. Most of the records occurred during the austral winter (n=15; 83.3%), with a peak in August, followed by 11.1% and 5.5% during spring and autumn, respectively. There was no record during summer. All males found and measured were subadults and the two recorded females were one adult and one juvenile. In 2002 six specimens were recorded, accounting for 33.3% of the total records followed by 2000 (n=4; 22.2 %). The records presented here suggest that the population increase in many breeding sites of A. tropicalis could result in new extra limital records. Furthermore, a complex marine current system appears to have an important role on the dispersal of the subantarctic fur seals found along the Atlantic South American coast. In addition, the contact of humans with these pinnipeds could increase the risk of disease transmission. RESUMO:

show abstract

Multiple origins of vagrant Subantarctic fur seals: a long journey to the Brazilian coast detected by molecular markers

Cited by 32 publications

References 15 publications

Analysis of subantarctic fur seal ( Arctocephalus tropicalis) records in Bahia and Sergipe, north-eastern Brazil

Analysis of subantarctic fur seal ( Arctocephalus tropicalis) records in Bahia and Sergipe, north-eastern Brazil

The Marine Mammal Programme at the Prince Edward Islands: 38 years of research

Straggler subantarctic fur seal (<i>Arctocephalus tropicalis</i>) on the coast of Rio de Janeiro State, Brazil

Contact Info

Product

Resources

About