Establishment of Feral Populations
Many of the more remote, typhoon-prone islands with very small or failed human colonies are the naturalized homes of wild junglefowl, described as Violaceous Junglefowl by early European naturalists and considered a new species. Backcrossing of many generations of the hybrid Bekisar males with feral domestic game hens must occur before fertile females are produced. Female hybrid offspring of Green Junglefowl crossed with domestic fowl are always sterile, laying eggs which are incapable of being fertilized by either Green or Red Junglefowl, or by domestic fowl. This means that backcrossing would be a common mode of self-perpetuation.
When competing clans, tribal wars, disease and typhoons extirpated or very nearly exterminated human populations or forced migrations, feral fowl, pigs and dogs would often remain on these remote islands. Natural predators such as monitor lizards, seabirds, pythons and other predators would hunt out the feral chickens with the most domesticated traits. Those incapable of flying or running rapidly would not live long enough to reproduce. Those incapable of surviving long periods without fresh water would also perish, and those lacking the appropriate instincts to survive frequent typhoons would also be selected against.
Famous quotes containing the words establishment of and/or populations:
“The essence of belief is the establishment of a habit; and different beliefs are distinguished by the different modes of action to which they give rise.”
—Charles Sanders Peirce (18391914)
“The populations of Pwllheli, Criccieth,
Portmadoc, Borth, Tremadoc, Penrhyndeudraeth,
Were all assembled. Criccieths mayor addressed them
First in good Welsh and then in fluent English,”
—Robert Graves (18951985)