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<DIV id=publishedOnlineDate sizset="5" sizcache="2">Journal of Avian
Biology</DIV>
<DIV sizset="5" sizcache="2">Article first published online: 12 JUN 2012</DIV>
<DIV id=doi>DOI: 10.1111/j.1600-048X.2012.05660.x</DIV>
<DIV id=copyright class=copyright> </DIV></SPAN></DIV>
<DIV class=articleTitle><SPAN class=mainTitle><FONT size=4>Evidence for strong
assortative mating, limited gene flow, and strong differentiation across the
blue-footed/Peruvian booby hybrid zone in northern Peru</FONT></SPAN></DIV>
<DIV id=cr1 sizset="5" sizcache="2">Scott A. Taylor, David J. Anderson, Carlos
B. Zavalaga and, Vicki L. Friesen</DIV>
<DIV id=publishedOnlineDate sizset="5" sizcache="2">Dept of Biology, Queen's
Univ., Kingston, ON K7L 3N6, Canada. S. A. Taylor Dept of Biology, Queen's
Univ., Kingston, ON K7L 3N6, Canada. E-mail: <!--TODO: clickthrough URL--><A
title="Link to email address" href="mailto:dr.scott.a.taylor@gmail.com"
shape=rect><FONT color=#007e8a>dr.scott.a.taylor@gmail.com</FONT></A></DIV>
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<DIV style="CLEAR: left" id=publicationHistoryDetails jQuery1340074559187="11">
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<DIV class=viewFullArticleAndPdfOptions><FONT size=2>Summary</FONT><A
class=pdfLink title="Article in pdf format"
href="http://onlinelibrary.wiley.com/doi/10.1111/j.1600-048X.2012.05660.x/pdf"
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<DIV style="CLEAR: left">Hybrid zones represent natural laboratories in which
the processes of divergence and genetic isolation can be examined. The
generation and maintenance of a hybrid zone requires mispairing and successful
reproduction between organisms that differ in one or more heritable traits.
Understanding the dynamics of hybridization between two species requires an
understanding of the extent to which they have diverged genetically, the
frequency of misparing and hybrid production, and the extent of introgression.
Three hundred and twenty one blue-footed <EM>Sula nebouxii</EM> and Peruvian
<EM>S. variegata</EM> boobies from the eastern tropical Pacific Ocean were
analyzed using 19 putatively neutral genetic markers to evaluate interspecific
differentiation, to classify morphological hybrids using Bayesian assignments,
and to characterize hybridization using cline theory and Bayesian assignments.
The species were well differentiated at mitochondrial and nuclear
microsatellites, the hybrid zone was bimodal (contained a high frequency of each
parental species but a low frequency of hybrids), and morphologically
intermediate individuals were most likely F1 hybrids resulting from mating
between female Peruvian boobies and male blue-footed boobies. Clines in allele
frequency could be constrained to share a common geographic centre but could not
be constrained to share a common width. <U>Peruvian and blue-footed boobies
hybridize infrequently, potentially due to strong premating reproductive
isolation; however, backcrossing appears to facilitate introgression from
blue-footed to Peruvian boobies in this hybrid
system.</U></DIV></FONT><BR>
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