{"id":1326,"date":"2025-01-20T09:08:35","date_gmt":"2025-01-20T09:08:35","guid":{"rendered":"https:\/\/uni.hi.is\/apalsson\/?p=1326"},"modified":"2025-01-20T09:08:35","modified_gmt":"2025-01-20T09:08:35","slug":"preprint-gene-flow-and-habitat-heterogeneity-shape-coexistence-dynamics-of-arctic-charr-morphs-in-connected-lakes","status":"publish","type":"post","link":"https:\/\/uni.hi.is\/apalsson\/2025\/01\/20\/preprint-gene-flow-and-habitat-heterogeneity-shape-coexistence-dynamics-of-arctic-charr-morphs-in-connected-lakes\/","title":{"rendered":"Preprint: Gene flow and habitat heterogeneity shape coexistence dynamics of Arctic charr morphs in connected lakes"},"content":{"rendered":"

Han Xiao, Arnar Palsson, Zophon\u00edas Oddur J\u00f3nsson, et al. Gene flow and habitat heterogeneity shape coexistence dynamics of Arctic charr morphs in connected lakes. Authorea.<\/i> December 27, 2024. DOI: 10.22541\/au.173531304.47377188\/v1<\/a><\/span><\/p>\n

Submitted to Molecular Ecology.<\/p>\n

\n

Abstract<\/h2>\n
Sympatric morphs provide valuable systems for studying incipient divergence despite incomplete reproductive isolation. In connected waterbodies with spatially heterogeneous habitats, one or more morphs may form metapopulation structures, generating eco-evolutionary dynamics unlike those in single lakes. We studied the phenotypic and genome-wide differentiation in Arctic charr (Salvelinus alpinus) in two Icelandic lakes: Thingvallavatn, known to harbour four distinct morphs, and a smaller downstream lake, Ulfljotsvatn. Our analyses confirm a single origin of charr polymorphism in this system, with all morphs present in both lakes. Relative morph abundances differ between the lakes: PL-charr dominate in Thingvallavatn, whereas LB-charr are most abundant in Ulfljotsvatn. Three morphs, large- (LB-), small (SB-) benthivorous and planktivorous (PL-) charr, are genetically distinct. The system likely forms a source-sink structure for both PL- and SB-charr, though migration rates from Thingvallavatn vary remarkably, resulting in distinct population dynamics. Conversely, LB-char exhibit genetic differentiation between the lakes, suggesting the presence of a separate population in Ulfljotsvatn. While piscivorous (PI-) charr appear genetically similar to PL-charr, evidence suggests hybridization between PI- and LB-charr in both lakes. Moreover, the higher hybridization in the downstream lake likely contributes to the observed erosion of genetic separation between LB- and PL-charr in Ulfljotsvatn. These findings suggest that the complex interplay of habitat heterogeneity and morph-specific migrations shapes the coexistence and eco-evolutionary dynamics of sympatric charr morphs in the connected lakes. Our study highlights the importance of investigating early divergence in spatially complex systems to advance eco-evolutionary research.<\/div>\n
\n
\"\"<\/a>

Comparison of distributions of Heterozygosity by morphs and lakes<\/p><\/div>\n<\/div>\n<\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

Han Xiao, Arnar Palsson, Zophon\u00edas Oddur J\u00f3nsson, et al. Gene flow and habitat heterogeneity shape coexistence dynamics of Arctic charr morphs in connected lakes. Authorea. December 27, 2024. DOI: 10.22541\/au.173531304.47377188\/v1 Submitted to Molecular Ecology. Abstract Sympatric morphs provide valuable systems … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":132,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[209],"tags":[],"class_list":["post-1326","post","type-post","status-publish","format-standard","hentry","category-publications"],"_links":{"self":[{"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/posts\/1326","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/users\/132"}],"replies":[{"embeddable":true,"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/comments?post=1326"}],"version-history":[{"count":1,"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/posts\/1326\/revisions"}],"predecessor-version":[{"id":1328,"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/posts\/1326\/revisions\/1328"}],"wp:attachment":[{"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/media?parent=1326"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/categories?post=1326"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uni.hi.is\/apalsson\/wp-json\/wp\/v2\/tags?post=1326"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}