/sci/ - Science & Math

>>12007591
>Subspecies don't require groups to be completely isolated from one another, that would be species.
Not even species require that.

>>11802290
>Species seems pretty cut and dry
Not even that. Lots of different species can share environments and have fertile offspring. Polar and brown bears are an example among others. There's also wolves and coyotes, whose hybrids became large populations classified as their own species or subspecies (red wolves, eastern wolves...)
Or theres those two species of crows which interviewed all along the white line.

>>11702062
>>11702082
Quantify
>significant adaptation
>abnormally close
>minimal adaptation

>>11317242
>Poelstra and coworkers sequenced almost the entire genomes of both species in populations at varying distances from the contact zone to find that the two species were genetically identical, both in their DNA and in its expression (in the form of mRNA), except for the lack of expression of a small portion (<0.28%) of the genome (situated on avian chromosome 18) in the hooded crow, which imparts the lighter plumage colouration on its torso.[4] Thus the two species can viably hybridize, and occasionally do so at the contact zone, but the all-black carrion crows on the one side of the contact zone mate almost exclusively with other all-black carrion crows, while the same occurs among the hooded crows on the other side of the contact zone. It is therefore clear that it is only the outward appearance of the two species that inhibits hybridization.[4][12]