{"id":1679,"date":"2011-09-29T20:05:56","date_gmt":"2011-09-29T20:05:56","guid":{"rendered":"http:\/\/planets.ucla.edu\/?p=1679"},"modified":"2021-01-18T01:40:29","modified_gmt":"2021-01-18T09:40:29","slug":"sept-29-2011-physical-processes-and-evolutionary-consequences","status":"publish","type":"post","link":"http:\/\/planets.ucla.edu\/?p=1679","title":{"rendered":"Sept 29 2011: Physical Processes and Evolutionary Consequences"},"content":{"rendered":"<p><strong>Speaker:<\/strong><br \/>\n<a href=\"http:\/\/www.eeb.ucla.edu\/indivfaculty.php?FacultyKey=1773\" target=\"_blank\" rel=\"noopener noreferrer\">David Jacobs<\/a><br \/>\nDept. Ecology &amp; Evolutionary Biology, UCLA<\/p>\n<p><strong>Abstract:<\/strong><br \/>\nThree vignettes of different scales of flow and landscape influence on<br \/>\nbiotic process will be presented.<\/p>\n<p>1) The Late Precambrian Rangeomorph fauna of Mistaken Point Newfoundland<br \/>\nconstitute the earliest community of large multicellular organisms.<br \/>\nThrough flow modeling we demonstrate that these organisms evolved large<br \/>\nsize to access higher velocities in a low flow environment. Access to<br \/>\nvelocity overcomes diffusional limits to resource acquisition in a<br \/>\ncommunity dependant on dissolved resources, providing the impetus to<br \/>\nthe evolution of large multicellular form.<\/p>\n<p>2) Rapid landscape evolution of the Society Islands resulted from recent<br \/>\nsea-level fall from a mid-Holocene maximum. This fall first generated a<br \/>\nplethora of reef-top atolls in Polynesia. In the last two millennia<br \/>\nsuch islands have been eliminated preferentially from the south-sides<br \/>\nof the Society Islands as a consequence of wave energy from the<br \/>\nSouthern Ocean, yielding dramatic change of reef and lagoon<br \/>\nenvironments with attendant consequences for marine life and the human<br \/>\npopulation.<\/p>\n<p>3) Coastal estuaries of California have undergone a maturation process<br \/>\nduring the Holocene converting many estuaries from bays to lagoonal<br \/>\nsystems dominated by the episodic\/seasonal stream flow of our<br \/>\nMediterranean climate. The impacts of the inter-annual details of<br \/>\nstream flow on dispersal of a seasonal-lagoon specialist fish, the<br \/>\ntidewater goby, are examined using high-resolution genotyping.<br \/>\nConservation genetic and estuarine restoration issues are touched upon.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Speaker: David Jacobs Dept. Ecology &amp; Evolutionary Biology, UCLA Abstract: Three vignettes of different scales of flow and landscape influence on biotic process will be presented. 1) The Late Precambrian Rangeomorph fauna of Mistaken Point Newfoundland constitute the earliest community of large multicellular organisms. Through flow modeling we demonstrate that these organisms evolved large size &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/planets.ucla.edu\/?p=1679\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Sept 29 2011: Physical Processes and Evolutionary Consequences&#8221;<\/span><\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[256],"tags":[257],"class_list":["post-1679","post","type-post","status-publish","format-standard","hentry","category-colloquia","tag-jacobs-d"],"_links":{"self":[{"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=\/wp\/v2\/posts\/1679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1679"}],"version-history":[{"count":9,"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=\/wp\/v2\/posts\/1679\/revisions"}],"predecessor-version":[{"id":13242,"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=\/wp\/v2\/posts\/1679\/revisions\/13242"}],"wp:attachment":[{"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1679"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/planets.ucla.edu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}