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DTSTART:20120325T030000
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DTSTAMP:20260505T051852Z
UID:5004044ca80f2@ist.ac.at
DTSTART:20121015T163000
DTEND:20121015T173000
DESCRIPTION:Speaker: Jerry Coyne\nAbstract: The genetic basis of morphologi
 cal\, behavioral\, and reproductive differences between\nspecies can give 
 us clues about the evolutionary processes that yield new species. In this\
 ntalk I summarize ten years of work on two closely related species of Dros
 ophila that live on\nthe oceanic island of Sao Tome\, 250 km off the coast
  of Gabon. After describing the\nnumerous reproductive barriers\, both eco
 logical and physiological\, that separate these\nspecies\, I summarize the
  genetic basis of their differences in pigmentation and of their\nsexual i
 solation and the sterility of male hybrids. Because the species form hybri
 d zones\nwhere their ranges overlap\, we also can measure the degree of in
 trogression between the\ntwo species\, and show that it differs markedly d
 epending on the region of the genome\nanalyzed. There are not "islands of 
 speciation" but rather "islands of introgression".\nFinally\, I describe t
 he hybrid zones between these species and the role of hybridization in\npr
 oducing heightened reproductive isolation ("reinforcement"). The presence 
 of a hybrid\nzone in an area inhabited by only one of the two species pres
 ents us with an unsolved\npuzzle.
LOCATION:Raiffeisen Lecture Hall\, Central Building\, ISTA
ORGANIZER:ihetzenauer@ist.ac.at
SUMMARY:Jerry Coyne: Institute Colloquium: Two flies on an island: Speciati
 on in African Drosophila
URL:https://talks-calendar.ista.ac.at/events/464
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