Persistent panmixia despite extreme habitat loss and population decline in the threatened tricolored blackbird (Agelaius tricolor)

Abstract

Rising anthropogenic pressures over the past century have created a global biodiversity crisis (Ceballos et al., 2015). Countless species have experienced significant population decline due to habitat reduction and alteration in the course of human activities, and many are now threatened with extinction (Zalasiewicz et al., 2011). Efforts to slow and reverse these trends are often limited by a deficiency of information regarding the evolutionary processes that dictate long-term species survival (Smith & Bernatchez, 2008). Historically, attempts to fill this information gap employed genetic markers with the capacity for evaluating only coarse genetic patterns (e.g.,

Genetic basis and adaptive implications of temperature-dependent and temperature-independent effects of drought on chickpea phenology

“…Candidate genes involved in the development of reproductive organs, hormone signalling and abiotic stress signalling were under selection for drought effect on phenology FST genome scan reliably identifies genomic regions associated with ecologically and agronomically important traits in small populations (Barr et al, 2021;Jordan et al, 2015;Li et al, 2017;Sadras et al, 2016;Van Bocxlaer, 2017;Xu et al, 2012). Genomic regions associated with DEP in early-or latesown crops, but not in both, were assumed to reflect the temperature-dependent component of the trait.…”

“…FST genome-scan is based on neutral theory, assuming that polymorphisms are selectively neutral and random genetic drift is the main driver of allele frequencies in populations without selection (Booker et al, 2020). This approach to detect selection signals in small samples has been insightfull in ecological and evolutionary settings (Barr et al, 2021;Van Bocxlaer, 2017), for crops including rice (Oryza sativa), wheat and chickpea (Jordan et al, 2015;Li et al, 2017;Sadras et al, 2016;Xu et al, 2012), and for crop pests such as the soybean aphid, Aphis glycines (Coates et al, 2020). The reliability of FST genome scan is particularly apparent in a comparison between FST genome scan and genome-wide association (GWAS), with both returning a common 100 kb region (AB4.1) on chromosome 4 associated with Ascochyta blight resistance in chickpea (Li et al, 2017).…”