Individual variation in the duration of pregnancy and birth date in Antarctic fur seals: the role of environment, age, and sex of fetus

Boyd, I.L.. 1996 Individual variation in the duration of pregnancy and birth date in Antarctic fur seals: the role of environment, age, and sex of fetus. Journal of Mammalogy, 77 (1). 124-133. https://doi.org/10.2307/1382714

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Official URL: http://dx.doi.org/10.2307/1382714

Abstract/Summary

The duration of 506 pregnancies in Antarctic fur seals (Arctocephalus gazelld) was measured 1983–1993. On average, pregnancy lasted 359 days, with a range of 340–390 days, representing 20% of the period of post-implantation fetal growth. Pregnancy was longest and birth dates latest in years associated with reduced availability of food. Sex of fetus and birth mass had no effect on the duration of pregnancy or date of birth. However, dates of parturition tended to be consistent within individuals.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.2307/1382714
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	1545-1542
Additional Keywords:	Pinnipedia, pregnancy, birth date, Antarctica
Date made live:	25 Oct 2016 13:51 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/514926

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.2307/1382714

Programmes:

BAS Programmes > Pre 2000 programme

ISSN:

1545-1542

Additional Keywords:

Pinnipedia, pregnancy, birth date, Antarctica

Date made live:

25 Oct 2016 13:51 +0 (UTC)