Studies on the southern elephant seal, Mirounga leonina (L.). IV. Breeding and development

Carrick, Robert; Csordas, S. E.; Ingham, S. E.

doi:10.1071/cwr9620161

Cited by 173 publications

(120 citation statements)

References 4 publications

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“…Harem-breeding female SESs were counted within a previously defined study area hereafter termed 'ISTHMUS', and for the whole island, hereafter termed 'ISLAND' [24]. ISTHMUS females were counted in all years from 1988 to 2011 (n ¼ 24); ISLAND females were counted on 18 occasions over the same study period.…”

Section: Methods (A) Seal Data Collection and Analysesmentioning

confidence: 99%

Bottom-up regulation of a pole-ward migratory predator population

et al. 2014

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As the effects of regional climate change are most pronounced at polar latitudes, we might expect polar-ward migratory populations to respond as habitat suitability changes. The southern elephant seal (Mirounga leonina L.) is a pole-ward migratory species whose populations have mostly stabilized or increased in the past decade, the one exception being the Macquarie Island population which has decreased continuously over the past 50 years. To explore probable causes of this anomalous trend, we counted breeding female seals annually between 1988 and 2011 in order to relate annual rates of population change (r) to foraging habitat changes that have known connections with atmospheric variability. We found r (i) varied annually from 20.016 to 0.021 over the study period, (ii) was most effected by anomalous atmospheric variability after a 3 year time lag was introduced (R ¼ 0.51) and (iii) was associated with sea-ice duration (SID) within the seals' foraging range at the same temporal lag. Negative r years may be extrapolated to explain, at least partially, the overall trend in seal abundance at Macquarie Island; specifically, increasing SID within the seals foraging range has a negative influence on their abundance at the island. Evidence is accruing that suggests southern elephant seal populations may respond positively to a reduced sea-ice field.

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Section: Methods (A) Seal Data Collection and Analysesmentioning

confidence: 99%

Bottom-up regulation of a pole-ward migratory predator population

et al. 2014

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“…Female promiscuity is known from behavioural observations in several phocid species (Carrick et al 1962;Le Boeuf 1972;Boness & James 1979) and may be more common than initially thought among otariids (Boness et al 1993). However, little effort has been directed at assessing genetic outcomes of this promiscuity or at trying to understand why it occurs.…”

Section: Ca)mentioning

confidence: 99%

Proximate factors associated with high levels of extraconsort fertilization in polygynous grey seals

et al. 1999

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“…For example, Lydekker (1909) proposed a subspeci¢c distinction between populations in di¡erent ocean basins based on di¡erences in skull morphology. Carrick et al (1962) and Bryden (1968) showed that elephant seals from MQ and HD islands grew more slowly and to a smaller ultimate size than elephant seals on SG. However, Bryden (1968) further suggested that these di¡erences in growth rate are environmentally determined and related to prey resources (especially where this limits the capacity for females to provision pups during suckling).…”

Section: Introductionmentioning

confidence: 99%

Genetic and morphometric differentiation between island and mainland southern elephant seal populations

Hoelzel

Campagna

Arnbom

2001

Proc. R. Soc. Lond. B

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We compare genetic (both nuclear and mitochondrial) and morphometric measures between two putative populations of southern elephant seal (Mirounga leonina), and interpret the results in the context of data from mark-recapture and satellite-telemetric studies. One population is on the Argentine mainland, while the other is 2400 km away on South Georgia island. We found pronounced di¡erentiation at the mitochondrial DNA (mtDNA) control region that was distinct from the pattern of variation seen among island rookeries. Some morphometric characters and seven out of ten nuclear-DNA markers also showed di¡erentiation between the island and mainland sites. Diversity at nuclear markers was high in both populations but mtDNA diversity was low in the mainland population, suggesting a founder event and little subsequent immigration of females. Morphological di¡erences may suggest di¡erent selective environments at the two sites.

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Studies on the southern elephant seal, Mirounga leonina (L.). IV. Breeding and development

Cited by 173 publications

References 4 publications

Bottom-up regulation of a pole-ward migratory predator population

Bottom-up regulation of a pole-ward migratory predator population

Proximate factors associated with high levels of extraconsort fertilization in polygynous grey seals

Genetic and morphometric differentiation between island and mainland southern elephant seal populations

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