Search results
Results from the WOW.Com Content Network
The two species are not genetically compatible: the result of over 27 attempts in Russia to hybridise the two species was just one stillborn kit, bred from the pairing of a male North American beaver and a female Eurasian beaver. The difference in chromosome count makes interspecific breeding unlikely in areas where the two species' ranges overlap.
On one extreme is allopatry, in which the overlap is zero (no gene flow), and on the other extreme is sympatry, in which the ranges overlap completely (maximal gene flow). The varying definitions of sympatric speciation fall generally into two categories: definitions based on biogeography, or on population genetics.
It is a naturally occurring hybrid of narrowleaf cottonwood, Populus angustifolia, and eastern cottonwood, Populus deltoides, found where their ranges overlap. It is planted as a shade tree in cities in the Rockies, preferring to grow at elevations between 4,500 and 8,500 ft. [ 3 ] [ 4 ] Given the plant's proclivity (like other poplars) to send ...
The species are hard to distinguish, and their ranges overlap; furthermore, several of them have large numbers of slightly different varieties, and several of the species hybridise naturally. To decide which species a particular specimen belongs to, therefore, is likely to require a detailed examination with an identification key in hand.
Arbutus unedo and A. andrachne hybridise naturally where their ranges overlap; the hybrid has been named Arbutus × andrachnoides (syn. A. × hybrida, or A. andrachne × unedo), [10] inheriting traits of both parent species, though fruits are not usually borne freely, and as a hybrid is unlikely to breed true from seed. It is sold in California ...
Quercus × rosacea (or Quercus rosacea) (or Devony Oak), is a naturally occurring hybrid species of oak native to Europe. They are the offspring of sessile oak, Quercus petraea, and common oak, Quercus robur, found where their ranges overlap.
Steller's jay (Cyanocitta stelleri) is one of two species in the genus Cyanocitta, the other species being the blue jay (Cyanocitta cristata); because the two species sometimes interbreed naturally where their ranges overlap in the eastern foothills of the Rocky Mountains, their status as distinct species has been contested. There are 18 ...
The species can also be distinguished by habitat: where the ranges overlap, common hackberry occurs primarily in upland areas, whereas sugarberry occurs mainly in bottomland areas. [3] Sugarberry's range extends from the Southeastern United States west to Texas and south to northeastern Mexico. [2] It is also found on the island of Bermuda. [4]