Population Structure and Genetic Diversity Analyses Reveal Isolation That May Imperil the Northernmost Colony of the Endangered Australian Sea Lion
Abstract
Marine environments are experiencing rapid warming, substantially altering ecosystems. Populations at the edge of a species' range are more vulnerable to environmental change as they are first affected and may have limited dispersal opportunities. This vulnerability may be exacerbated in species with specialised foraging and breeding strategies. The Australian sea lion ( Neophoca cinerea ) is an endangered otariid species that breeds across a ~3000 km range in southern Australia. At the most north‐westerly edge of the species' distribution, Australian sea lions breed across multiple islands within the Houtman Abrolhos Archipelago, Western Australia, a tropical‐temperate location affected by marine heatwaves. This study aimed to examine the genetic structure and diversity of the Australian sea lions from the Houtman Abrolhos Archipelago compared to other populations in the species' range. One hundred and twenty‐five individuals, 19 from Houtman Abrolhos, were genotyped from 19 sample sites across Western Australia and South Australia. Our findings showed that individuals from the Houtman Abrolhos grouped into a single population, which was highly differentiated and had extremely low genetic diversity. The isolation and limited genetic variation of the Houtman Abrolhos Australian sea lion population suggest that it is extremely vulnerable to extirpation. Our study highlights the vulnerability of isolated populations of a species to rapid environmental change and stochastic events.
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BibTeX
@article{morris2026population,
title = {{Population Structure and Genetic Diversity Analyses Reveal Isolation That May Imperil the Northernmost Colony of the Endangered Australian Sea Lion}},
author = {Vanessa Morris and Anthony Chariton and Robert Harcourt and Catherine E Grueber and Isabelle Charrier and Holly Raudino and Kelly Waples and Roger Kirkwood and Simon D Goldsworthy and Benjamin J Pitcher},
journal = {Ecology and Evolution},
year = {2026},
month = oct,
doi = {10.1002/ece3.73038},
url = {https://hal.science/hal-05775025v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Population Structure and Genetic Diversity Analyses Reveal Isolation That May Imperil the Northernmost Colony of the Endangered Australian Sea Lion
AU - Vanessa Morris
AU - Anthony Chariton
AU - Robert Harcourt
AU - Catherine E Grueber
AU - Isabelle Charrier
AU - Holly Raudino
AU - Kelly Waples
AU - Roger Kirkwood
AU - Simon D Goldsworthy
AU - Benjamin J Pitcher
PY - 2026
DA - 2026/10/02
JO - Ecology and Evolution
DO - 10.1002/ece3.73038
UR - https://hal.science/hal-05775025v1
AB - Marine environments are experiencing rapid warming, substantially altering ecosystems. Populations at the edge of a species' range are more vulnerable to environmental change as they are first affected and may have limited dispersal opportunities. This vulnerability may be exacerbated in species with specialised foraging and breeding strategies. The Australian sea lion ( Neophoca cinerea ) is an endangered otariid species that breeds across a ~3000 km range in southern Australia. At the most north‐westerly edge of the species' distribution, Australian sea lions breed across multiple islands within the Houtman Abrolhos Archipelago, Western Australia, a tropical‐temperate location affected by marine heatwaves. This study aimed to examine the genetic structure and diversity of the Australian sea lions from the Houtman Abrolhos Archipelago compared to other populations in the species' range. One hundred and twenty‐five individuals, 19 from Houtman Abrolhos, were genotyped from 19 sample sites across Western Australia and South Australia. Our findings showed that individuals from the Houtman Abrolhos grouped into a single population, which was highly differentiated and had extremely low genetic diversity. The isolation and limited genetic variation of the Houtman Abrolhos Australian sea lion population suggest that it is extremely vulnerable to extirpation. Our study highlights the vulnerability of isolated populations of a species to rapid environmental change and stochastic events.
SN - 2045-7758
ER -