Funded PhD Opportunity, University of Leeds, UK: Deadline 8th January 2025

The evolutionary genomics of life-history adaptations in pinnipeds

Pinnipeds (seals, sea lions, fur seals and walrus) are keystone marine 
predators, and sentinels for marine ecosystem health. Advances in genomics 
technologies are opening up the possibility to identify and dissect the 
genetics and molecular evolution underlying the adaptions of pinnipeds to the 
marine environment and the startling variation in ecology and life history 
present within the family. Understanding these mechanisms not only provides 
fundamental insights into the process of evolution, but is also important for 
assessing species vulnerability and responses to potential future environmental 
change. Some of the unique adaptions of pinnipeds may also be of relevance to 
human health and therapeutics.

This project will build on rapidly growing genomic resources for pinnipeds, 
including de novo seal genome assemblies generated by the Goodman/O’Connell 
labs and other colleagues in the Pinniped Genome Consortium. These provide an 
opportunity to use comparative genomics to examine key aspects of pinniped 
ecology and evolution including physiological adaptations underpinning 
different life-history strategies.

For example, adult body size can range from less than 100kg in Caspian seals to 
more than 2000kg for male elephant seals, while weaning times vary from 4-12 
days in hooded and harp seals up to 18 months in some sea lions, and 2 years in 
the walrus. Pinnipeds have also evolved lipid rich milk, with fat content for 
some species exceeding 60%. The ecological drivers of these differences appear 
to be related to breeding substrates and ecological feeding niche exploited by 
species. In previous work we have identified 100s of genes that show signatures 
of adaptive evolution unique to different pinniped lineages and species which 
may underpin these adaptations. Many of these genes are associated with key 
elements of lipid metabolism and milk properties.

Our next aim is to understand how these genes have evolved across the pinniped 
lineage, and how past environmental changes created selection pressures shaping 
their evolution, and the evolution of pinnipeds overall. To do this we will use 
a variety of  genomic approaches including de novo sequencing of seal genomes, 
molecular evolution and phylogenomic analyses, and population genetic studies 
at the genomic level.

Secondly, we will also use multiomic approaches to understand the functional 
significance of amino acid substitutions between species in subsets of genes 
strongly associated with our traits of interest, and will evaluate how changes 
in gene expression might also contribute to evolution of traits such high fat 
content in pinniped milk, and tolerance of rapid fluxes of lipid in and out of 
blubber.

Resolving the genomic basis of such adaptations is important for understanding 
many aspects of pinniped biology, but may also contribute to predicting 
adaptive responses of pinniped species to future climate change and loss of sea 
ice.

Extended project description:
https://yes-dtn.ac.uk/research/the-evolutionary-genomics-of-life-history-adaptations-in-pinnipeds/

How to apply:
https://yes-dtn.ac.uk/application-information/

Supervisors
Dr Simon Goodman, Dr Ian Carr (University of Leeds)
Dr Kimberley Bennett (Abertay University)
Prof Mary O'Connell (University of Nottingham)

Informal inquiries: Dr Simon Goodman - s.j.good...@leeds.ac.uk, 
https://goodmanlab.org/


Eligibility and Funding Information:
Competition-funded via NERC YES-DTN starting from October 2025.
UK or International students eligible to apply.


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Dr Simon Goodman

School of Biology, University of Leeds

Woodhouse Lane, Leeds, LS2 9JT, UK



Tel: +44-(0)113-3432561

Email: s.j.good...@leeds.ac.uk<mailto:s.j.good...@leeds.ac.uk>

Web: http://www.goodmanlab.org/

Twitter: @DrSimon_Goodman

BlueSky: @phoca-sapiens.bsky.social


Sustainable Ecosystems and Adaptation Research Pillar Lead,

Ecology & Evolution Research Group Lead, School of Biology

Director of PGR Studies, School of Biology

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