However, we cannot eliminate the possibility that each peak contains more than one probe, and that either hybridization occurs through partial hybrids between a single target and multiple probes, or that multiple probe-target interactions occur within each peak.
When natural hybridization occurs at sites where the hybridizing species differ in abundance, the pollen load delivered to the rare species should be predominantly from the common species.
Further, we show that hybridization occurs not as a regional hybrid front, but rather as pockets within anthropogenic landscapes across the range (Fig. 2).
Hybridization occurs where two species' range overlap to form hybrid zones; hybrids may be created by humans when animals are placed in zoos or due to environmental pressures such as predation.
Genetic analysis on quails captured in this area confirmed that hybridization occurs between two subspecies, but details on this hybrid population (eg. degree of introgression) are still missing [36].
For this reason, the spatial setting is a crucial determinant of hybridization, and, in turn, the specific conditions under which hybridization occurs can, sometimes, be inferred from the geographical distribution of hybrids.
When the two co-occur in most of the world, spontaneously hybridization occurs to a limited extent, resulting in no more than highly localized hybrid swarms (Snow and Campbell 2005).
It is unlikely that direct hybridization occurs between mesophotic and shallow O. faveolata colonies in the Northern USVI, despite the potential for synchronous gametogenesis and spawning behavior.
Hybridization occurs on a more limited basis between the Red-shafted Flicker and the Gilded Flicker (C. chrysoides), a separate species that breeds in the Sonoran Desert (see Gilded Flicker account).
Interestingly there are photos of several birds from Antigua showing characters of Little x Snowy egret hybrids, perhaps during the early establishment of the species in an area where Snowy is common hybridization occurs.
Bayesian clustering methods, cpDNA haplotype networks, genetic diversity statistics, and coalescence-based analyses support a scenario where hybridization occurs while two genetic clusters corresponding to two species are maintained.
