intergradation การใช้

• Intergradation between the two subspecies occurs in the lower Tennessee River unit.
• Six subspecies are recognised, though there is significant intergradation between them.
• Still, there is very little intergradation in the areas where subspecies meet.
• Here too is a broad zone of intergradation.
• A zone of intergradation occurs between the two subspecies in north-central Queensland.
• There is complete intergradation between them in belly color and they do not seem to differ vocally.
• Such a broad area of intergradation has been taken as evidence of substantial genetic exchange between the two taxa.
• The distribution of the two are known to approach each other, but there is no evidence of intergradation.
• If there is little intergradation in this region, the case for the southern Andean populations being a distinct species is rather robust.
• Birds in eastern Chad ( " E . striolata jebelmarrae " ) show some evidence of intergradation with the house bunting.
• It is unlikely that future scientists would describe the races as species, since they would see unmistakable signs of interbreeding and intergradation.
• Individuals showing intermediate features are known from the small area of contact in north-central Brazil, but intergradation between the two species is generally limited.
• Between 19 and 20 parallel there appears to be an area of overlap or intergradation between " N . siki " and " N . leucogenys ".
• It is often considered a subspecies of the brown-throated sunbird, but the two differ consistently in measurements and plumage, and there is no evidence of intergradation between them.
• The two western varieties are distinguished by pubescent ( downy ) shoots, and may be related to extensive hybridisation and / or intergradation with the closely related Engelmann spruce found further south in the Rocky Mountains.
• Another critical zone for this analysis is an area in northeast Ecuador where " C . a . aecuatoriales " and white-headed capuchin are found, although neither sympatric distributions or intergradation have as yet been determined.
• Despite the range overlap there is no known intergradation between " Calliostoma palmeri " and " C . bonita " and the two species are considered to be distinct but closely related, making them sibling species.
• This was accepted by the US Fish and Wildlife Service in 1982 and a " zone of subspecies intergradation " was recognized soon thereafter, extending from the southern Rocky Mountains to the northern tip of the Mexican wolf's range.
• This is also substantiated by the finding of intergradation zones in north-central Vietnam, where hybrid populations of " C . g . galbinifrons " and " C . g . bourreti " are known to exist.
• The grey-throated sunbird found in the remaining part of the Philippines is often considered a subspecies of the brown-throated sunbird, but the two differ consistently in measurements and plumage, and there is no evidence of intergradation between them.