Little evidence of inbreeding depression for birth mass, survival and growth in Antarctic fur seal pups

Paijmans, A.J.; Berthelsen, A.L.; Nagel, R.; Christaller, F.; Kröcker, N.; Forcada, J. ORCID: https://orcid.org/0000-0002-2115-0150; Hoffman, J.I.. 2024 Little evidence of inbreeding depression for birth mass, survival and growth in Antarctic fur seal pups. Scientific Reports, 14 (1), 12610. 13, pp. 10.1038/s41598-024-62290-x

Before downloading, please read NORA policies.

Preview

Text (Open Access)
© The Author(s) 2024.
s41598-024-62290-x.pdf - Published Version
Available under License Creative Commons Attribution 4.0.
Download (4MB) | Preview

Official URL: https://www.nature.com/articles/s41598-024-62290-x

Abstract/Summary

Inbreeding depression, the loss of offspring fitness due to consanguineous mating, is generally detrimental for individual performance and population viability. We investigated inbreeding effects in a declining population of Antarctic fur seals ( Arctocephalus gazella ) at Bird Island, South Georgia. Here, localised warming has reduced the availability of the seal’s staple diet, Antarctic krill, leading to a temporal increase in the strength of selection against inbred offspring, which are increasingly failing to recruit into the adult breeding population. However, it remains unclear whether selection operates before or after nutritional independence at weaning. We therefore used microsatellite data from 885 pups and their mothers, and SNP array data from 98 mother–offspring pairs, to quantify the effects of individual and maternal inbreeding on three important neonatal fitness traits: birth mass, survival and growth. We did not find any clear or consistent effects of offspring or maternal inbreeding on any of these traits. This suggests that selection filters inbred individuals out of the population as juveniles during the time window between weaning and recruitment. Our study brings into focus a poorly understood life-history stage and emphasises the importance of understanding the ecology and threats facing juvenile pinnipeds.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1038/s41598-024-62290-x
ISSN:	2045-2322
Date made live:	27 Feb 2025 10:09 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/538975

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1038/s41598-024-62290-x

ISSN:

2045-2322

Date made live:

27 Feb 2025 10:09 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/538975