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When working with a citizen science database like eBird, there are many possible ways to filter or subsample observations. Here, we discuss the potential biases and assumptions that surround different subsampling approaches or filtering that can be done to the eBird database. Restricting observations to species that are known to frequently hybridize, a specific time of the year, or a specific location,...
The process of speciation remains poorly understood and hence definitions of species continue to be a focus of sharp debate. A key unresolved issue in speciation debates is whether local populations that are somewhat distinct from a parent population in morphology or genotype but that remain connected to the parent population via gene flow should be recognized as species. The species status of the...
We consider four key challenges related to estimating per‐individual rates of hybridization in wild birds: (1) what is the meaning of the term “hybrid”?, (2) the importance of distinguishing between shared DNA sequences and on‐going hybridization between populations, (3) the perils of focusing exclusively on known hybrid zones, and (4) the implications of very low rates of per individual hybridization...