subject: Global warming is harming species that are already endangered [print this page] Global warming is harming species that are already endangered. A study of woodpeckers in the US has found that isolated, inbred populations adapt poorly to climate change, and other troubled anion populations may face a similar threat.
"It could be an additional nail in the coffin of a species that already seriously challenged by other stresses," comments Johan Merilee, expert on the effects of climate change on Links Of London Charms birds. It's well known that ward springs in temperate northern latitudes encourage birds to lay their eggs earl; than usual. A couple of years ago Merilee and his team found that individual collared flycatchers(3?^) in Sweden, for instance, adapted their egg-lay: habits to the changing climate over a 16-year period.
Although these changes reflect adjustments by individuals rather than a evolutionary change in the populations, Karin Shadegg of the University Zurich and her colleagues suspected inbred populations might react differed to those with a wider gene pool. To find out, they analyzed nearly 20 yea: worth of data on red-cockaded (& 3fer 61) ) woodpeckers in North Carolyn They found that, on the whole, the birds had been laying their eg increasingly early in the past two decades. But this was not true for the groups: inexperienced females laying eggs for the first time, experience females with new mates, and inbred females. These birds brought their eg laying forward less than the other birds, or not at all, and had less young average than the other birds.
Shadegg thinks that the weakened immunity that tends to plague inbred birds somehow stops them adapting to climate change. This is supported by a study of tree swallows in New York, which found that birds with weaker manure systems laid eggs later than healthier birds.
Could climate change hurt other endangered species as well, given that they tend to have small, isolated and inbred populations? Schaech thinks so : The effect may not be Links Of London Earrings apparent in the egg-laying date or the start of the breeding season, but in other traits that are tied to climatic cues, such as migration and hibernation. " Both Schaech and Merilee warn that studies into lie long-term impacts of global warming are being threatened by a lack of ending. "They do not necessarily produce results early, but later they turn up to be goldmines, " says Merilee.
Global warming is harming species that are already endangered
By: endeavor19
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