Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2021
Erindi/veggspjald / Talk/poster E15
Höfundar / Authors: Marina de la Cámara (1), Kalina H. Kapralova (1), Sigurður S. Snorrason (1)
Starfsvettvangur / Affiliations: 1. Háskóla Íslands
Kynnir / Presenter: Marina de la Cámara
Arctic charr in Thingvallavatn (Iceland) represents one of the most iconic systems of ecological adaptive divergence, resulting in four different ecomorphs: a small benthic (SB), a large benthic (LB), a planktivorous (PL) and a piscivorous (PI). They differ in multiple phenotypic traits (i.e., size, trophic morphology, body shape, colouration, behaviour, life history traits and parasitic load). Although previous genetic studies have shown that PL, SB and LB form three distinct genetic clusters with negligible gene flow, many aspects of their evolutionary histories are still to unveil. Here, we use reduced representation genome data (ddRAD-seq) to look at population structure, admixture and introgression patterns and investigate the evolutionary origins of these ecomorphs. We found that, while PL and SB represent two separated populations, the genetic status of LB and PI morphs does not seem to be so simple. For example, two clear subopulation clusters were observed in the case of the LB morph. The genetic status of the PI appears to be even more complicated: individuals belonging phenotypically to this morph clustered genetically either with the PL or the LB morphs, or spanned the distance between the two. Combined, this data suggests multiple non-exclusive evolutionary histories for the PI and the LB. Additionally, we will use coalescence simulations to further explore the evolutionary origins of the four charr morphs.