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Elephant seals or sea elephants are very large, oceangoing earless seals in the genus Mirounga.Both species, the northern elephant seal (M. angustirostris) and the southern elephant seal (M. leonina), were hunted to the brink of extinction for lamp oil by the end of the 19th century, but their numbers have since recovered.
The northern elephant seal (Mirounga angustirostris) is one of two species of elephant seal (the other is the southern elephant seal). It is a member of the family Phocidae (true seals ). Elephant seals derive their name from their great size and from the male's large proboscis , which is used in making extraordinarily loud roaring noises ...
This variation could be a result of unequal sex ratios, high variance in family size, inbreeding, or fluctuating population size. [1] The smaller the population, the greater the probability that fluctuations will lead to extinction. An elephant seal harem has 1 male to 100 females resulting in an effective population size of only 4.
Southern elephant seal harem on a beach on the Kerguelen Islands. Southern elephant seal world population was estimated at 650,000 in the mid-1990s, [1] and was estimated in 2005 at between 664,000 and 740,000. [18] Studies have shown the existence of three geographic subpopulations, one in each of the three oceans.
Demographic economics or population economics is the application of economic analysis to demography, the study of human populations, including size, growth, density, distribution, and vital statistics.
There’s a reason the male elephant seals lounging on the sand look a bit ratty.
IUCN status and estimated population Ribbon seal. H. fasciata (Zimmermann, 1783) Arctic and subarctic regions of the North Pacific Ocean (blue indicates reduced summer range) Size: 165–175 cm (65–69 in) long; 72–90 kg (159–198 lb) [31] Habitat: Neritic marine and oceanic marine [32] Diet: Fish, crustaceans, and other invertebrates [32] LC
The country is home to almost a third of the world's savanna elephants, a population that has tripled since 1984, and Botswana is often hailed as a conservation success.