Model-based riverscape genetics: disentangling the roles of local and connectivity factors in shaping spatial genetic patterns of two Amazonian turtles with different dispersal abilities

Museums and cradles of diversity are geographically coincident for narrowly distributed Neotropical snakes

“…This contrast between highlands and lowlands was also identified for squamate reptiles in the Cerrado and the Caatinga domains in Brazil (Nogueira et al 2011, Guedes et al 2014, Azevedo et al 2016. Additionally, Amazonia contains the largest extension of a biome in the Neotropics (Olson et al 2001, Ab'Sáber 2003, implying that some of its endemic lineages have wider ranges compared to endemic species in other biomes (especially if most rivers are not important barriers to dispersal, Santorelli et al 2018, Oliveira et al 2019; which is also supported by the negative correlation between PE and distance to the biome border (Table 1). Although our method of computing species distributions based on alpha-hull polygons may have overestimated the ranges of some species (Graham and Hijmans 2006), thus exaggerating low PE patterns, the interpretation of our results is robust to the different mapping strategies and grid resolutions (Supplementary material Appendix 1 Fig.…”

Population dynamics of Amazonian floodplain forest species support spatial variation on genetic diversity but not range expansions through time

“…These results are in agreement with simulation‐based, and empirical studies reporting the high effect of IBD in the linear distribution of river systems, including the formation of differentiated lineages (Farias et al, 2019; Selkoe et al, 2015; Thomaz et al, 2016). Despite the strong signature of IBD within the Solimões River populations, the riverway distance plays a minor role in structuring genetic diversity across the entire Amazonian Basin, where environmental features produce strong barriers to gene flow (Hrbek et al, 2005; dos Anjos Oliveira et al, 2019; Thom et al, 2020). Our results reinforce the idea that IBD has to be taken into account when testing for genetic structure in continuous populations on the risk of assuming spurious discrete populations in downstream population genetics analyses (Bradburd et al, 2018).…”

Drivers of neutral and adaptive differentiation in pike (Esox lucius) populations from contrasting environments

“…However, studies investigating the relative importance of different modes of isolation are scarce and show contrasting results. Some studies suggest that resistance is the most important mechanism affecting neutral genetic variation (Camurugi et al, 2021; Oliveira et al, 2019; Xuereb et al, 2018). Other studies point to a main effect of the environment (Jiang et al, 2019; Quéméré et al, 2016; Rödin‐Mörch et al, 2019), and yet others indicate that distance is the main determinant of genetic structure (Ferreira et al, 2020; Vidal et al, 2019).…”