In contrast, if incompatibility were the product of reinforcement (Dobzhansky, 1937; Butlin, 1989; Liou and Price, 1994), it would be expected that selection against hybrids would lead to greater incompatibilities in the sympatric species pair than in the
allopatric pair.
However, most sibling species in Recent marine environments are sympatric (Knowlton 1993), suggesting that within-province speciation (either
allopatric or sympatric) is relatively common in nearshore marine environments.
Pumpkinseed were stocked so that a sympatric enclosure alternated with an
allopatric enclosure.
The frequencies of female and male mitochondrial 16S rRNA haplotypes for the
allopatric and hybrid zone populations of blue mussels (Mytilus edulis spp.
The experimental design consisted of trials in which a gravid female, from either a benthic species or a benthic-like
allopatric population, was introduced into the tank of a sexually receptive benthic or limnetic male.
oblonga is referred to as Echinometra type `D'; comparisons of morphology and cross-fertilization are under way for these
allopatric urchins (T.
Furthermore, the existence of two
allopatric groups in T.
sagrei did not differ between sympatric and
allopatric populations, whereas a significant difference did exist for A.
These include genetic drift, founder effects, and fixation of alternative advantageous alleles in
allopatric populations in response to identical selection pressures (Fisher 1930; Muller 1940; Wright 1940; Mayr 1954).
Sympatric populations of black and white crappie occur to the W of the Coosa River drainage, whereas
allopatric populations of black crappie occur to the E of the Coosa River drainage, except where white crappie have been introduced (Lee et al.
Although these two species are
allopatric over most of their range, an area of overlap occurs in southwestern Texas and northern Mexico where they are known to hybridize (Wilson, 1973; Lee and Engstrom, 1991; Brant and Lee, 2006).
Vector competence of Culex (Melanoconion) taeniopus for
allopatric and epizootic Venezuelan equine encephalomyelitis viruses.
