Animals and plants may not be able to evolve their way out of the threat posed by climate change, according to a UC Davis study of a tiny seashore animal. The work was published today (June 
in the journal Proceedings of the Royal Society B. The tide pool copepod Tigriopus californicus is found from Alaska to Baja California — but in a unique lab study, the animals showed little ability to evolve heat tolerance.”This is a question a lot of scientists have been talking about,” said study co-author Eric Sanford, an associate professor of evolution and ecology at UC Davis and a researcher at the university’s Bodega Marine Laboratory. “Do organisms have the ability to adapt to climate change on a timescale of decades?”UC Davis graduate student Morgan Kelly, the first author of the paper, collected copepods from eight locations between Oregon and Baja California in Mexico. The tiny shrimplike animals, about a millimeter long, live in tide pools on rocky outcrops（露头） high in the splash zone.Kelly grew the short-lived copepods in the lab for 10 generations, subjecting them to increased heat stress to select for more heat-tolerant animals.At the outset, copepods from different locations showed wide variability in heat tolerance. But within those populations, Kelly was able to coax only about a half-degree Celsius (about one degree Fahrenheit) of increased heat tolerance over 10 generations. And in most groups, the increase in heat tolerance had hit a plateau before that point.In the wild, these copepods can withstand（抵挡，抵挡） a temperature swing of 20 degrees Celsius a day, Kelly said. But they may be living at the edge of their tolerance, she said.Although the copepods are widespread geographically, individual populations are very isolated, confined to a single rocky outcrop where wave splash can carry them between pools. That means there is very little flow of new genes across the population as a whole.”It’s been assumed that widespread species have a lot of genetic capacity to work with, but this study shows that may not be so,” said co-author Rick Grosberg, professor of evolution and ecology at UC Davis. Many other species of animals, birds and plants face stress from climate change, and their habitats have also been fragmented（割裂） by human activity — perhaps more than we realize, he said.”The critical point is that many organisms are already at their environmental limits, and natural selection won’t necessarily rescue them,” Grosberg said.
| 你给文章评几分: |
you’ve a very nice sites here! would you like to make a few invite posts on my blog?
Hello! I just want to give an enormous thumbs up for the great information you will have right here on this post. I shall be coming again to your weblog for more soon.
It’s difficult to get professional people on this area, and you could be seen as you know what you’re talking about! Thanks
There’s noticeably a bundle to learn about this. I assume you made certain nice points in features also.
I precisely needed to thank you very much yet again. I am not sure the things that I could possibly have handled without those tips revealed by you about such a theme. Entirely was a difficult situation in my position, nevertheless spending time with this skilled avenue you managed that forced me to leap for fulfillment. Extremely happy for your help and as well , trust you recognize what a great job that you are undertaking instructing the mediocre ones by way of a site. I am certain you haven’t come across all of us.
That is the best weblog for anybody who wants to find out about this topic. You notice so much its nearly arduous to argue with you (not that I really would need…HaHa). You undoubtedly put a new spin on a topic thats been written about for years. Nice stuff, simply nice!
Does anybody know of any forums that discuss this issue in additional detail? I am fascinated.
Normally I do not read post on blogs, but I would like to say that this write-up very forced me to try and do it! Your writing style has been surprised me. Thanks, very nice post.
Hi there, how’s it going? Just shared this post with a colleague, we had a good laugh.
One important thing is that if you are searching for a student loan you may find that you’ll want a co-signer. There are many conditions where this is true because you will find that you do not employ a past credit history so the bank will require you have someone cosign the credit for you. Interesting post.
Superb blog! Do you have any helpful hints for aspiring writers? I’m hoping to start my own site soon but I’m a little lost on everything. Would you suggest starting with a free platform like WordPress or go for a paid option? There are so many choices out there that I’m totally overwhelmed .. Any recommendations? Thanks a lot!
Super share it is surely. We have been waiting for this content.
How can I keep up with posts made on the Blogspot websites?
Free iPod Music Downloads…
[...] This really answered my problem, thank you [...]…
Symptoms Of Low Vitamin D…
If you have been struggeling with sinus infections for a while you now how iritating it can be….