[MARMAM] New Publication: Population genomic structure and connectivity of common dolphins from Australasia

Andrea Barceló andreabarcelo.88 at gmail.com
Wed Mar 3 20:32:18 PST 2021

On behalf of all the co-authors we are pleased to announce our new
publication in the special issue of  Small Cetacean Conservation: Current
Challenges and Opportunities in Frontiers and Marine Science. The
publication is titled "A Matter of Scale: Population Genomic Structure and
Connectivity of Fisheries at-risk Common Dolphins (*Delphinus delphis*)
from Australasia"

The article can be obtained from:

An understanding of population structure and connectivity at multiple
spatial scales is required to assist wildlife conservation and management.
This is particularly critical for widely distributed and highly mobile
marine mammals subject to fisheries by-catch. Here, we present a population
genomic assessment of a near-top predator, the common dolphin (*Delphinus
delphis*), which is incidentally caught in multiple fisheries across the
Australasian region. The study was carried out using 14,799 ddRAD sequenced
genome-wide markers genotyped for 478 individuals sampled at multiple
spatial scales across Australasia. A complex hierarchical metapopulation
structure was identified, with three highly distinct and genetically
diverse regional populations at large spatial scales (>1,500 km). The
populations inhabit the southern coast of Australia, the eastern coast of
Australia, New Zealand and Tasmania, with the latter also showing a
considerable level of admixture to Australia's east coast. Each of these
regional populations contained two to four nested local populations (i.e.,
subpopulations) at finer spatial scales, with most of the gene flow
occurring within distances of 50 to 400 km. Estimates of contemporary
migration rates between adjacent subpopulations ranged from 6 to 25%.
Overall, our findings identified complex common dolphin population
structure and connectivity across state and international jurisdictions,
including migration and gene flow across the Tasman Sea. The results
indicate that inter-jurisdictional collaboration is required to implement
conservation management strategies and mitigate fisheries interactions of
common dolphins across multiple spatial scales in the Australasian region.

Barceló A, Sandoval-Castillo J, Stockin KA, Bilgmann K, Attard CRM, Zanardo
N, Parra GJ, Hupman K, Reeves IM, Betty EL, Tezanos-Pinto G, Beheregaray LB
and Möller LM (2021) A Matter of Scale: Population Genomic Structure and

of Fisheries At-Risk Common Dolphins (*Delphinus delphis*) From
Australasia. Front. Mar. Sci. 8:616673. doi: 10.3389/fmars.2021.616673

Kind regards,

Andrea Barceló

PhD Candidate

Cetacean, Ecology, Behaviour And Evolution Lab (CEBEL)| Molecular Ecology

School of Biological Sciences, Flinders University

andrea.barcelo at flinders.edu.au

www.cebel.org.au(CEBEL)| www.molecularecology.flinders.edu.au
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