第59回生態適応セミナー (Bセミナー)

     
 

日時:8月11日(木曜日)17:30 –

 
  場所:青葉山キャンパス生物棟1階大会議室
http://www.tohoku.ac.jp/japanese/profile/about/10/about1004/
 
     

講師:Prof. Erik Svensson (Lund Unversity, Sweden)

     
  Ecological and non-ecological speciation mechanisms  
     
 

  Ecological speciation has been an increasingly growing research field since the 1990'ties, and there are now numerous examples of adaptive radiations which are thought to have arisen by means of ecological speciation. Examples include sticklebacks, Anolis-lizards and seed-eating birds like Darwin's finches on the Galapagos islands and crossbills in North America. Usually, ecological divergence is thought to precede the evolution of reproductive isolation, which arises as a correlated response to divergent selection (so-called "by-product speciation"). Although this mode of speciation might be common in nature, more recently several researchers have pointed out that speciation is not always a result of ecological differences and speciation might often be both non-adaptive and non-ecological in many taxa. In my talk I will critically discuss ecological speciation theory, its empirical support and some alternatives to ecological speciation from nature. My empirical examples will largely be from odonates (dragonflies and damselflies) and recent research in my own research laboratory and of colleagues.