Haematology, red cell enzymes, and red cell metabolic intermediates of 20 wild southern elephant seals (Mirounga leonina) from Macquarie Island

1995 ◽  
Vol 5 (1) ◽  
pp. 1-6 ◽  
Author(s):  
W. D. Melrose ◽  
M. M. Feast ◽  
R. Woods ◽  
A. McMinn ◽  
D. M. L. Jupe ◽  
...  
Keyword(s):  
Red Cell ◽  
Mirounga Leonina ◽  
Elephant Seals ◽  
Macquarie Island ◽  
Metabolic Intermediates ◽  
Red Cell Enzymes ◽  
Southern Elephant Seals

Growth of female southern elephant seals Mirounga leonina at Macquarie Island

Polar Biology ◽  
2005 ◽  
Vol 28 (5) ◽  
pp. 395-401 ◽  
Author(s):  
Cameron M. Bell ◽  
Harry R. Burton ◽  
Mary-Anne Lea ◽  
Mark A. Hindell
Keyword(s):  
Mirounga Leonina ◽  
Elephant Seals ◽  
Macquarie Island ◽  
Southern Elephant Seals

Migrations and foraging of juvenile southern elephant seals from Macquarie Island within CCAMLR managed areas

2002 ◽  
Vol 14 (2) ◽  
pp. 134-145 ◽  
Author(s):  
John van den Hoff ◽  
Harry R. Burton ◽  
Mark A. Hindell ◽  
Michael D. Sumner ◽  
Clive R. McMahon
Keyword(s):  
Foraging Ecology ◽  
Polar Front ◽  
Commercial Fishing ◽  
Antarctic Polar Front ◽  
Mirounga Leonina ◽  
Elephant Seals ◽  
Macquarie Island ◽  
Location Data ◽  
Southern Elephant Seals ◽  
The Antarctic

Twenty-three juvenile (8–14 months of age) southern elephant seals (Mirounga leonina L.) from Macquarie Island were tracked during 1993 and 1995. Migratory tracks and ocean areas with concentrated activity, presumed to be foraging grounds, were established from location data gathered by attached geolocation-time depth recorders. The seals ranged widely (811–3258 km) and foraging activity centred on oceanographic frontal systems, especially the Antarctic Polar Front and bathymetric features such as the Campbell Plateau region. The seals spent 58.6% of their sea time within managed fishery areas while the remainder was spent on the high seas, an area of unregulated fishing. The Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) areas 58.4.1, 88.2 and especially 88.1 were important and distant foraging areas for these juvenile elephant seals. From fisheries records, diet and the foraging ecology studies of the seals there appears to be little, if any, overlap or conflict between the seals and commercial fishing operations within the regulated commercial areas. However, attention is drawn to the possibility of future interactions if Southern Ocean fisheries expand or new ones commence.

First-year survival of southern elephant seals, Mirounga leonina , at sub-Antarctic Macquarie Island

Polar Biology ◽  
1999 ◽  
Vol 21 (5) ◽  
pp. 279-284 ◽  
Author(s):  
Clive R. McMahon ◽  
Harry R. Burton ◽  
Marthan N. Bester
Keyword(s):  
First Year ◽  
Mirounga Leonina ◽  
Elephant Seals ◽  
Macquarie Island ◽  
Southern Elephant Seals

Dispersal of southern elephant seals (Mirounga leonina L.) marked at Macquarie Island

2001 ◽  
Vol 28 (4) ◽  
pp. 413 ◽  
Author(s):  
John van den Hoff
Keyword(s):  
Island Population ◽  
Mirounga Leonina ◽  
Elephant Seals ◽  
Macquarie Island ◽  
North East ◽  
The North ◽  
Southern Elephant Seals ◽  
Juvenile Population ◽  
Maximum Proportion ◽  
Campbell Island

Southern elephant seals marked at Macquarie Island disperse to distant locations where they are sometimes seen during their moult and, for juveniles, a mid-year haul-out period (July–August). Most (87%) of these resighted seals were within 1000 km of Macquarie Island, and most commonly at Campbell Island (700 km to the north-east). The sex and age classes most likely to disperse there were males less than two years old. Male elephant seals of all ages were resighted significantly more often than females, the ratio being 2 : 1 (P > 0.05). Migration duration tended to increase with the seals’ age but migration distance was underestimated from resight observations when compared with known telemetry records. Emigration from the Macquarie Island population appears limited. From the resight effort at Campbell Island during 1995 the maximum proportion of the juvenile population from Macquarie Island to haul-out at Campbell Island was in the order of 0.0053.

Age in relation to Breeding to Status of the Male Southern Elephant Seal, Mirounga leonina (L.), at Macquarie Island

1981 ◽  
Vol 8 (2) ◽  
pp. 327 ◽  
Author(s):  
E Jones
Keyword(s):  
Elephant Seal ◽  
Progressive Increase ◽  
Southern Elephant Seal ◽  
Mirounga Leonina ◽  
Elephant Seals ◽  
Macquarie Island ◽  
Southern Elephant Seals ◽  
Definition Of ◽  
Breeding Seasons ◽  
Breeding Status

Records of the breeding status of known-age male southern elephant seals at Macquarie I. were kept during five breeding seasons between 1969 and 1976. The seven status categories used were: beachmaster, secure assistant, medium harem owner, insecure assistant, small harem owner, attending bachelor, avoiding bachelor. There was a progressive increase in breeding status with age; none younger than 10-y-old bred: 16% of 10-y-olds, 30% of 11-y-olds and 55% of 12-y-olds did so; none younger than 12-y-old attained secure assistant status. At the earliest, beachmaster status may be attained at 14 y old, but no beachmasters of known age were recorded. Due to mortality and competition, most males do not breed and few breed for more than two seasons. Problems associated with the precise definition of status categories are discussed.

Origins, age composition and change in numbers of moulting southern elephant seals (Mirounga leonina L.) in the Windmill Islands, Vincennes Bay, east Antarctica, 1988 - 2001

2003 ◽  
Vol 30 (3) ◽  
pp. 275 ◽  
Author(s):  
John van den Hoff ◽  
Rupert Davies ◽  
Harry Burton
Keyword(s):  
Mature Male ◽  
East Antarctica ◽  
Mirounga Leonina ◽  
Age Classes ◽  
Age Composition ◽  
Elephant Seals ◽  
Macquarie Island ◽  
Heard Island ◽  
Southern Elephant Seals ◽  
Windmill Islands

We discovered that the number of male southern elephant seals (Mirounga leonina) moulting at wallow sites in the Windmill Islands, Vincennes Bay, Antarctica has decreased by 88% since the last data were presented in 1989. This figure equates to an annual decrease of 6.5%, a figure quite different to the known population trends at the islands from where the seals originate. The seals inhabited four fewer wallows in 2001 than in 1990. Brand and tag resights confirm that seals moulting at Browning Peninsula and Peterson Island originate from Macquarie Island and Heard Island. Male seals aged 1–7+ years of age were present but most (68%) were aged over 7. Males aged 4 years old began to haul out in mid-February while prior to that time only male seals older than 5 years were seen. Timing of moult for particular age classes was similar to that observed at other breeding islands. Trends in the numbers of adolescent and mature male seals hauled out at the sub-antarctic breeding locations require investigation.

scholarly journals Dispersal of southern elephant seals (Mirounga leonina) from Davis Base, Antarctica: Combining population genetics and tracking data

2021 ◽  
Author(s):  
Michelle Chua ◽  
Simon Ho ◽  
Clive McMahon ◽  
Ian Jonsen ◽  
Mark de Bruyn
Keyword(s):  
Genetic Diversity ◽  
Marine Environment ◽  
Elephant Seal ◽  
Southern Elephant Seal ◽  
Tracking Data ◽  
Mirounga Leonina ◽  
Long Distance ◽  
Elephant Seals ◽  
Macquarie Island ◽  
Southern Elephant Seals

Marine animals such as the southern elephant seal (Mirounga leonina) rely on a productive marine environment and are vulnerable to oceanic changes that can affect their reproduction and survival rates. Davis Base, Antarctica, acts as a moulting site for southern elephant seals that forage in Prydz Bay, but the genetic diversity and natal source populations of these seals has not been characterized. Determining the genetic diversity of moulting populations like this one provides essential information on seal dispersal, inter-population mixing, and foraging behaviours. In this study, we combined genetic and animal tracking data on these moulting seals to identify levels of genetic diversity, natal source population, and movement behaviours during foraging and haul-out periods. Using mitochondrial sequence data, we identified two major breeding lineages of seals at Davis Base. We found that the majority of the seals originated from breeding stocks within the South Atlantic Ocean and South Indian Ocean. One seal was grouped with the Macquarie Island breeding stock (South Pacific Ocean). The Macquarie Island population, unlike the other two stocks, is decreasing in size. Tracking data revealed long-distance foraging activity of the Macquarie Island seal around Crozet Islands. We speculate that changes to the Antarctic marine environment have resulted in a shift in foraging and dispersal strategies, which subsequently affects seal population growth rates. These findings have implications for conservation management plans aimed at improving the population status of the southern elephant seal.

Sign in / Sign up

Export Citation Format

Share Document