Download or read book Genetic analysis of twinning in Antarctic fur seals Arctocephalus gazella written by J.I. HOFFMAN and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Genetics and Mating System of Antarctic Fur Seals Arctocephalus Gazella at Livingston Island Antarctica written by Carolina Aimoré Bonin and published by . This book was released on 2012 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antarctic fur seals, Arctocephalus gazella, were hunted to near-extinction in the early 1800's, but have recovered during the past 70 years to re-colonize most of their historical range. The large South Georgia (SG) fur seal population has been considered the main source of immigrants that re-colonized other areas, including Livingston Island (LI). Despite being one of the most exploited marine mammal species, clear evidence for a genetic bottleneck is lacking and instead, exceptionally high genetic diversity has been detected. Nevertheless, little is known about population-level patterns of genetic structure, or how this species' polygynous mating system may influence such patterns. This thesis fills some of this knowledge gap via extensive efforts in the field and in the laboratory, where over 1,000 individual samples were processed to obtain data on 17 highly polymorphic microsatellite markers; of these, 365 were also sequenced for mtDNA hypervariable region 1. The results of this work uncovered : (i) unexpected genetic differentiation between SG and LI indicating that LI was re-colonized by immigrants from one or more sources in addition to SG, (ii) remarkably high male reproductive success at a low-density LI colony during four breeding seasons, suggesting reduced competition among males at LI relative to the high-density colony of Bird Island (SG) (iii) a low percentage of rematings among individuals over the course of a decade, which was surprising considering the high level of breeding site fidelity and male reproductive skew found in this species, and (iv) one case of multiple-paternity in Antarctic fur seals among twins, showing that females may often escape control of territorial males within a breeding period. Not only do these findings provide unique insights into the remarkable re-colonization of Antarctic fur seals, but they also emphasize the importance of satellite populations for harboring genetic diversity through a period of profound anthropogenic disturbance. Additionally, by revealing complexities within male and female breeding behavior, this work advances our overall understanding of polygyny, providing insight into how it might function under different population densities and how individuals may interact over the course of their lives within this mating system.

Download or read book The Reproductive Energetics of Antarctic Fur Seals Arctocephalus Gazella written by Birgitte Irene McDonald and published by . This book was released on 2009 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic tagging reveals extreme site fidelity in territorial male Antarctic fur seals Arctocephalus gazella written by J.I. HOFFMAN and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pup production and distribution of breeding Antarctic fur seals Arctocephalus gazella at South Georgia written by I.L. BOYD and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth in the Antarctic fur seal Arctocephalus gazella written by M.R. PAYNE and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Postsealing genetic variation and population structure of two species of fur seal Arctocephalus gazella and A tropicalis written by L.P. WYNEN and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The diet of Antarctic fur seals Arctocephalus gazella Peters during the breeding season at Heard Island written by K.A. Green and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dispersal of male and female Antarctic fur seals Arctocephalus gazella written by I.L. BOYD and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The diet of Antarctic fur seals Arctocephalus gazella during the breeding season at South Georgia written by K. REID and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Causes of offspring mortality in the Antarctic fur seal Arctocephalus gazella written by K. REID and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mass changes and metabolism in territorial male Antarctic fur seals Arctocephalus gazella written by I.L. BOYD and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low reproductive success in territorial male Antarctic fur seals Arctocephalus gazella suggests the existence of alternative mating strategies written by N.J. GEMMELL and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reproductive bioenergetics of the antarctic fur seal Arctocephalus gazella written by D.P. COSTA and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Palaeolimnology of Antarctic fur seal Arctocephalus gazella populations and implications for Antarctic management written by D.A. HODGSON and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The second survey of Antarctic fur seals Arctocephalus gazella on the Courbet Peninsula Iles Kerguelen written by M.N. BESTER and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population size and age determination in the Antarctic fur seal Arctocephalus gazella written by M.R. PAYNE and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: