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<DIV id=productTitle><FONT size=2>Marine Ecology</FONT></DIV>
<DIV class=articleDetails><A
href="http://onlinelibrary.wiley.com/doi/10.1111/mae.2012.33.issue-3/issuetoc"
shape=rect><FONT color=#000000><FONT size=2><SPAN id=volumeNumber>Volume
33</SPAN>, <SPAN id=issueNumber>Issue 3</SPAN>, </FONT></FONT></A><FONT
size=2><SPAN id=issuePages>pages 317–325</SPAN>, <SPAN id=issueDate>September
2012</SPAN></FONT></DIV>
<DIV class=articleTitle><FONT size=2>Article first published online: 11 OCT
2011</FONT></DIV>
<DIV id=doi class=articleTitle><FONT
size=2>DOI: 10.1111/j.1439-0485.2011.00491.x</FONT></DIV></FONT></SPAN></DIV>
<DIV class=articleTitle><SPAN class=mainTitle><FONT
size=4></FONT></SPAN> </DIV>
<DIV class=articleTitle><SPAN class=mainTitle><FONT size=4>Latitudinal trends in
the species richness of free-living marine nematode assemblages from exposed
sandy beaches along the coast of Chile (18–42 °S)</FONT></SPAN></DIV>
<DIV class=articleTitle><SPAN class=mainTitle></SPAN><FONT size=2>Matthew R.
Lee</FONT><SUP><FONT size=1>1,2</FONT></SUP><FONT size=2>, </FONT><FONT
size=2>Marcela Riveros</FONT><SUP><FONT size=1>2</FONT></SUP></DIV>
<DIV><FONT size=2><SUP>1</SUP> </FONT><FONT size=2> Centro de Investigación y
Desarrollo de Recursos y Ambientes Costeros (i∼mar), Universidad de Los Lagos,
Puerto Montt, Chile </FONT><FONT size=2><SUP>2</SUP> </FONT><FONT
size=2> Instituto de Ciencias Marinas y Limnológicas y Laboratorio Costero de
Recursos Acuáticos de Calfuco, Facultad de Ciencias, Universidad Austral de
Chile, Valdivia, Chile.</FONT><FONT size=2> E-mail: <!--TODO: clickthrough URL--></FONT><A title="Link to email address"
href="mailto:matt@matthewlee.org" shape=rect><FONT color=#007e8a
size=2>matt@matthewlee.org</FONT></A></DIV>
<H3>Abstract</H3>
<DIV class=para>
<P>The latitudinal pattern of species richness of free-living marine nematodes
from exposed sandy beaches along the coast of Chile between 18 and 42° S
was examined. Unlike many other examinations of latitudinal gradients, this
study is not based on data mined from the literature, but on samples collected
specifically to examine these themes. Five replicate quantitative
50 cm<SUP><FONT size=1>3</FONT></SUP> samples of sediment were taken from
the zone of retention of 66 exposed sandy beaches. The free-living nematode
fauna was identified and quantified to species level. The data were then examine
using ordinary least squares and simultaneous autoregressive model
(SAR<SUB><FONT size=1>err</FONT></SUB>) regression methods, examining the
associations between species richness and latitude, coastline complexity, and
sea surface temperature, primary productivity of the adjacent coastal waters and
mean latitudinal range size. The species richness of free-living marine
nematodes from exposed sandy beaches along the coast of Chile decreased with
increasing latitude and was strongly associated with mean annual sea surface
temperature. Mean latitudinal range size increased with increasing latitude,
supporting Rapoport’s rule, and decreased with increasing species richness.
<U>The results suggest that the nematode fauna of exposed sandy beaches is
derived from a low latitude fauna that has dispersed to higher latitudes, but
that many species may be physiologically constrained, by temperature, from
dispersing further south.</U></P></DIV></FONT><BR>
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