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<p class="MsoNormal" style="text-autospace:none"><a name="_MailOriginalBody">Join us this week for the Geological Sciences colloquium featuring cool evolutionary biology (niches, morphospace, and heterochony, on my!) of seriously awesome fossils! with Dr. James
Lamsdell of West Virginia University.<o:p></o:p></a></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody">Also, let me know if you like to meet with James—he’ll be around from 11am until 2pm for meetings/lunch. James does a lot of work in phylogenetics and also weird
fossils (including the Tully monster).<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody">Alycia<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><b><span style="font-size:14.0pt;color:#2D2A2A">Geological Sciences colloquium</span></b></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:14.0pt;color:#2D2A2A">April 20 @ 2:00 pm in Clippinger 205</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:14.0pt;font-family:"MS Gothic";color:#244185">
</span></span><span style="mso-bookmark:_MailOriginalBody"><b><span style="font-size:18.0pt;color:#193C66">Exploring
environmental drivers of morphological change in horseshoe crabs and sea scorpions</span></b></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:14.0pt;color:#193C66">James Lamsdell, Assistant Professor</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:14.0pt;color:#193C66">West Virginia University Department of Geology and Geography</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="color:#193C66"> </span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><b><span style="font-size:12.0pt;color:#193C66">Abstract: </span></b></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:12.0pt;color:#193C66">The
importance of both intrinsic biological and external environmental factors in defining macroevolutionary patterns has been recognized since its popularization by G. G. Simpson. However, there is still much discussion about how the genealogical and ecological
hierarchies interact, the outcome of these interactions on patterns of morphospace occupation, and the general repeatability of the evolutionary outcome of any given situation. Of particular interest are the drivers of morphological innovation and whether
novel morphologies are associated with shifts in Hutchinsonian niche. Phylogenetic paleoecology, combining tree-based frameworks of relationships with geologic paleoenvironmental data, is one way to explore how clades respond to broad-scale changes in environment.
Arthropods are an excellent group on which to conduct such studies due to their character-rich hard external exoskeleton. Combining studies of phylogeny, empirical morphospace, and environmental occupation, I compare variations in ecology and morphospace across
the evolutionary history of two Paleozoic arthropod groups, the Eurypterida and Xiphosurida. Both groups undergo a change in evolutionary regime during the Late Devonian, linked to an ecological transition from marine to freshwater environments. In eurypterids
the change manifests as a reduction in diversity with the surviving lineage exhibiting low disparity alongside a decrease in endemism, with new species exhibiting general peramorphic morphological trends. Xiphosurids, however, show the opposite trend, with
the invasion of non-marine environments resulting in a shift away from bradytely and a proliferation of new pedomorphic species that occupy novel regions of morphospace. Interestingly, other xiphosurid groups that invade non-marine environments during the
Mesozoic show a similar ecological pattern of differentiation, speciation and subsequent extinction. Shifts in ecology therefore have long-term impacts on a lineage’s macroevolutionary trajectory, with eurypterids experiencing a permanent shift in morphospace
in response to the regime change in the Devonian. Importantly, intrinsic factors within lineages (peramorphic vs. pedomorphic trends) appear as important as external (ecologic) elements in mediating morphological innovation.</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"></span><a href="https://www.ohio-forum.com/2018/04/geology-colloquium-exploring-environmental-drivers-of-morphological-change-in-horseshoe-crabs-and-sea-scorpions-april-20/"><span style="mso-bookmark:_MailOriginalBody">https://www.ohio-forum.com/2018/04/geology-colloquium-exploring-environmental-drivers-of-morphological-change-in-horseshoe-crabs-and-sea-scorpions-april-20/</span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"> <img border="0" width="670" height="421" style="width:6.9791in;height:4.3854in" id="Picture_x0020_2" src="cid:image001.jpg@01D3D659.87CA4590"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">***************************</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Alycia L. Stigall</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Professor</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Department of Geological Sciences</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">OHIO Center for Ecology and Evolutionary Studies</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Ohio University</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">316 Clippinger Laboratories</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Athens, Ohio 45701</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">(740) 593-0393</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"></span><a href="applewebdata://0A7DDF58-741D-4DD0-9C51-6F5CCDE681FA/compose/?adb_to=stigall@ohio.edu"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#6B006D">stigall@ohio.edu</span></span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"></span><a href="http://alyciastigall.org/"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0B4CB4">http://alyciastigall.org</span></span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody"><u><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> </span></u></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">(My
lab website)</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"></span><a href="http://www.ohio.edu/paleo"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0B4CB4">http://www.ohio.edu/paleo</span></span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> (OHIO
Paleo program)</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Paleontological Society Treasurer</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
<pre><span style="mso-bookmark:_MailOriginalBody"><span style="font-family:"Arial",sans-serif"> </span></span><span style="color:gray"><o:p></o:p></span></pre>
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