Fine-scale population structure and local adaptation despite high population connectivity in a marine teleost ( Chrysophrys auratus )

Fine-scale population structure and local adaptation despite high population connectivity in a marine teleost ( Chrysophrys auratus ) | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 2 May 2025 V1 Latest version Share on Fine-scale population structure and local adaptation despite high population connectivity in a marine teleost ( Chrysophrys auratus ) Authors : Tom Oosting 0000-0002-7031-0747 [email protected] , Bastiaan Star , Maren Wellenreuther 0000-0002-2764-8291 , and Peter Ritchie Authors Info & Affiliations https://doi.org/10.22541/au.174618603.36471047/v1 338 views 224 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Accelerated climate change is forcing species to adapt at unprecedented rates, but molecular mechanisms of how wild marine species adapt remain unclear. Here we use the marine teleost Chrysophrys auratus (Australasian snapper) as an exemplar high gene flow species to evaluate its ability to adapt to environmental pressures. Despite its commercial and cultural value in New Zealand, no detailed genomic analyses of its population structure have been performed. Using whole-genome sequencing of 382 individuals across 13 locations covering the New Zealand species range, we uncovered two distinct genetic clusters, a northeastern (NE-cluster) and a southwestern (SW-cluster) group, separated by distinct genetic discontinuities around Tauroa and Mahia Peninsulas. PCA, F ST and admixture analyses clearly supported this split, revealing strong ancestry shifts at these geographic breaks, and areas around the genetic discontinuities where mixing of individuals from both clusters is occurring. Despite this high gene flow, we found compelling evidence of local adaptation in 38 significantly differentiated genomic regions. Two regions showed strong signs of a recent or ongoing selective sweep, each containing candidate genes linked to growth rate. For both regions, the NE-cluster exhibited directional selection, while the environmentally heterogeneous SW-cluster showed signatures of balancing selection. These patterns highlight the nuanced interplay between population connectivity, selection, and local environments and highlights the need to monitor both standing and adaptive genetic variation. As climate change accelerates, managing adaptive variation in marine teleosts like snapper will be critical to maintaining their resilience and sustainability under intensifying environmental pressures. Supplementary Material File (mec-23-0960_main_text.docx) Download 216.60 KB Information & Authors Information Version history V1 Version 1 02 May 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords adaptation fisheries science gene flow population genomics selection whole-genome-sequencing Authors Affiliations Tom Oosting 0000-0002-7031-0747 [email protected] Victoria University of Wellington View all articles by this author Bastiaan Star Oslo University View all articles by this author Maren Wellenreuther 0000-0002-2764-8291 New Zealand Institute for Plant and Food Research Ltd View all articles by this author Peter Ritchie Victoria University of Wellington View all articles by this author Metrics & Citations Metrics Article Usage 338 views 224 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Tom Oosting, Bastiaan Star, Maren Wellenreuther, et al. Fine-scale population structure and local adaptation despite high population connectivity in a marine teleost ( Chrysophrys auratus ). Authorea . 02 May 2025. DOI: https://doi.org/10.22541/au.174618603.36471047/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. 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