[ISL] "When chickens go wild"
3 Quarks Daily linked to Ewen Callaway's article in Nature examining the wild chickens of Kauai. How do imported species adapt to their new environment? What does the term "wild" mean? Great stuff.
As the two try to act casual by their rented car, a jet-black hen with splashes of iridescent green feathers pecks its way along a trail of bird feed up to a device called a goal trap. Wright tugs at a string looped around his big toe and a spring-loaded net snaps over the bird. After a moment of stunned silence, the hen erupts into squawking fury.
Opaekaa Falls, like much of Kauai, is teeming with feral chickens - free-ranging fowl related both to the domestic breeds that lay eggs or produce meat for supermarket shelves and to a more ancestral lineage imported to Hawaii hundreds of years ago.
These modern hybrids inhabit almost every corner of the island, from rugged chasms to KFC car parks. They have clucked their way into local lore and culture and are both beloved and reviled by Kauai's human occupants. Biologists, however, see in the feral animals an improbable experiment in evolution: what happens when chickens go wild?
The process of domestication has moulded animals and their genomes to thrive in human environments. Traits that ensure survival in the wild often give way to qualities that benefit humans, such as docility and fast growth. Feralization looks, on its surface, like domestication in reverse. But closer inspection suggests that the chickens of Kauai are evolving into something quite different from their wild predecessors, gaining some traits that reflect that past, but maintaining others that had been selected by humans. In this way, they are similar to other populations of animals, including dogs, pigs and sheep, that have broken free of captivity and flourished.
By looking at feral animals, some evolutionary biologists hope to determine how domestic animals and their genes change in response to natural pressures. The research could also help to inform tricky conservation questions about how such animals affect native species, and ultimately whether and how to control them.
As the two try to act casual by their rented car, a jet-black hen with splashes of iridescent green feathers pecks its way along a trail of bird feed up to a device called a goal trap. Wright tugs at a string looped around his big toe and a spring-loaded net snaps over the bird. After a moment of stunned silence, the hen erupts into squawking fury.
Opaekaa Falls, like much of Kauai, is teeming with feral chickens - free-ranging fowl related both to the domestic breeds that lay eggs or produce meat for supermarket shelves and to a more ancestral lineage imported to Hawaii hundreds of years ago.
These modern hybrids inhabit almost every corner of the island, from rugged chasms to KFC car parks. They have clucked their way into local lore and culture and are both beloved and reviled by Kauai's human occupants. Biologists, however, see in the feral animals an improbable experiment in evolution: what happens when chickens go wild?
The process of domestication has moulded animals and their genomes to thrive in human environments. Traits that ensure survival in the wild often give way to qualities that benefit humans, such as docility and fast growth. Feralization looks, on its surface, like domestication in reverse. But closer inspection suggests that the chickens of Kauai are evolving into something quite different from their wild predecessors, gaining some traits that reflect that past, but maintaining others that had been selected by humans. In this way, they are similar to other populations of animals, including dogs, pigs and sheep, that have broken free of captivity and flourished.
By looking at feral animals, some evolutionary biologists hope to determine how domestic animals and their genes change in response to natural pressures. The research could also help to inform tricky conservation questions about how such animals affect native species, and ultimately whether and how to control them.