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quang

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quang

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bạn j ơi link hỏng rồi ko mở đc có j bạn post link lại nhé:please:
Xin lỗi vì cái link có vấn đề, bạn có thể tìm theo số của bà báo minh copy sau nhe'
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0><TBODY><TR><TD align=left>Science 4 July 2008:
Vol. 321. no. 5885, p. 96
DOI: 10.1126/science.1157570
</TD><TD align=right>Prev | Table of Contents | Next
</TD></TR></TBODY></TABLE>
Brevia

<!-- BEGIN: legacy HTML content --><!--RESUMEHIGHLIGHT-->Reduced Responses to Selection After Species Range Expansion

</NOBR><NOBR>Benoit Pujol</NOBR> and <NOBR>John R. Pannell<SUP>*</SUP></NOBR>
Species range expansion reduces genetic variation at the margins<SUP> </SUP>of a species range and should thus compromise the adaptive potential<SUP> </SUP>of its marginal populations. Remarkably, this prediction has<SUP> </SUP>not previously been tested. Here, we show that populations of<SUP> </SUP>the plant Mercurialis annua, which expanded its range into Spain<SUP> </SUP>and Portugal from North Africa after the Pleistocene glaciation,<SUP> </SUP>respond to selection on a key life-history trait less well than<SUP> </SUP>populations from the species' historical refugium. Our results<SUP> </SUP>provide direct evidence of a decline in adaptive potential across<SUP> </SUP>the geographic range of a species after a shift in its distribution.<SUP> </SUP>Predicting evolutionary responses to environmental change will<SUP> </SUP>thus need to account for the genetic heterogeneity of species<SUP> </SUP>and the spatial dynamics of their geographic distributions.<SUP> </SUP>
[SIZE=-1]Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK. [/SIZE]
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<SUP>*</SUP> To whom correspondence should be addressed. E-mail: john.pannell@plants.ox.ac.uk<SCRIPT type=text/javascript><!-- var u = "john.pannell", d = "plants.ox.ac.uk"; document.getElementById("em0").innerHTML = '<a href="mailto:' + u + '@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
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