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<BODY bgColor=#ffffff><FONT size=2 face=Arial><CITE><SPAN
class="slug-metadata-note ahead-of-print">
<DIV jQuery1353986468211="3"><BR></SPAN><ABBR class=slug-jnl-abbrev
title=Science>Science</ABBR><SPAN class=slug-pub-date itemprop="datePublished">
23 November 2012: </SPAN><BR><SPAN class=slug-vol>Vol. 338 </SPAN><SPAN
class=slug-issue>no. 6110 </SPAN><SPAN class=slug-pages>pp. 1085-1088
</SPAN><BR>DOI: <SPAN class=slug-doi
title=10.1126/science.1224836>10.1126/science.1224836 </SPAN></DIV>
<DIV jQuery1353986468211="3"><SPAN class=slug-doi
title=10.1126/science.1224836></SPAN> </DIV>
<DIV jQuery1353986468211="3"><SPAN class=slug-doi
title=10.1126/science.1224836><SPAN
class="slug-metadata-note ahead-of-print">Published Online <SPAN
class=slug-ahead-of-print-date>October 25 2012</SPAN></SPAN></SPAN></CITE></DIV>
<DIV> </DIV>
<DIV><FONT size=4>A Global Pattern of Thermal Adaptation in Marine
Phytoplankton</FONT></DIV>
<DIV class="article abstract-view" jQuery1353986468211="5"
itemprop="articleBody" sizset="0" sizcache="1">
<DIV id=contrib-1 class=contributor itemscope="itemscope"
itemtype="http://schema.org/Person" itemprop="author" sizset="0"
sizcache="0"><SPAN class=name itemprop="name"><A class=name-search
href="http://www.sciencemag.org/search?author1=Mridul+K.+Thomas&sortspec=date&submit=Submit">Mridul
K. Thomas</A></SPAN><A id=xref-aff-1-1 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-1"
jQuery1353986468211="20"><SUP>1</SUP></A><SPAN class=xref-sep>,</SPAN><A
id=xref-aff-2-1 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-2"
jQuery1353986468211="21"><SUP>2</SUP></A><SPAN class=xref-sep>,</SPAN><A
id=xref-corresp-1-1 class=xref-corresp
href="http://www.sciencemag.org/content/338/6110/1085.abstract#corresp-1">*</A><SPAN
class=xref-sep>,</SPAN><A id=xref-fn-1-1 class=xref-fn
href="http://www.sciencemag.org/content/338/6110/1085.abstract#fn-1">†</A>,
<SPAN class=name itemprop="name"><A class=name-search
href="http://www.sciencemag.org/search?author1=Colin+T.+Kremer&sortspec=date&submit=Submit">Colin
T. Kremer</A></SPAN><A id=xref-aff-1-2 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-1"
jQuery1353986468211="22"><SUP>1</SUP></A><SPAN class=xref-sep>,</SPAN><A
id=xref-aff-3-1 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-3"
jQuery1353986468211="23"><SUP>3</SUP></A><SPAN class=xref-sep>,</SPAN><A
id=xref-fn-1-2 class=xref-fn
href="http://www.sciencemag.org/content/338/6110/1085.abstract#fn-1">†</A>,
<SPAN class=name itemprop="name"><A class=name-search
href="http://www.sciencemag.org/search?author1=Christopher+A.+Klausmeier&sortspec=date&submit=Submit">Christopher
A. Klausmeier</A></SPAN><A id=xref-aff-1-3 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-1"
jQuery1353986468211="24"><SUP>1</SUP></A><SPAN class=xref-sep>,</SPAN><A
id=xref-aff-3-2 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-3"
jQuery1353986468211="25"><SUP>3</SUP></A>, <SPAN class=name><A class=name-search
href="http://www.sciencemag.org/search?author1=Elena+Litchman&sortspec=date&submit=Submit">Elena
Litchman</A></SPAN><A id=xref-aff-1-4 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-1"
jQuery1353986468211="26"><SUP>1</SUP></A><SPAN class=xref-sep>,</SPAN><A
id=xref-aff-2-2 class=xref-aff
href="http://www.sciencemag.org/content/338/6110/1085.abstract#aff-2"
jQuery1353986468211="27"><SUP>2</SUP></A><SUP></SUP></DIV>
<DIV class=contributor itemscope="itemscope" itemtype="http://schema.org/Person"
itemprop="author" sizset="0" sizcache="0"><SUP>1</SUP>W. K. Kellogg Biological
Station, Michigan State University, Hickory Corners, MI 49060, USA.
<SUP>2</SUP>Department of Zoology, Michigan State University, East Lansing, MI
48824, USA. <SUP>3</SUP>Department of Plant Biology, Michigan State University,
East Lansing, MI 48824, USA. E-mail: <A
href="mailto:thomasmr@msu.edu">thomasmr@msu.edu</A></DIV>
<DIV class=contributor itemscope="itemscope" itemtype="http://schema.org/Person"
itemprop="author" sizset="0" sizcache="0"> </DIV>
<DIV class=contributor itemscope="itemscope" itemtype="http://schema.org/Person"
itemprop="author" sizset="0" sizcache="0"><STRONG>Abstract</STRONG></DIV>
<DIV id=abstract-3 class="section abstract">
<P id=p-4>Rising ocean temperatures will alter the productivity and composition
of marine phytoplankton communities, thereby affecting global biogeochemical
cycles. Predicting the effects of future ocean warming on biogeochemical cycles
depends critically on understanding how existing global temperature variation
affects phytoplankton. Here we show that variation in phytoplankton temperature
optima over 150 degrees of latitude is well explained by a gradient in mean
ocean temperature. An eco-evolutionary model predicts a similar relationship,
suggesting that this pattern is the result of evolutionary adaptation. Using
mechanistic species distribution models, we find that rising temperatures this
century will cause poleward shifts in species’ thermal niches and a sharp
decline in tropical phytoplankton diversity in the absence of an evolutionary
response. </P></DIV></DIV></FONT></BODY></HTML>