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Advisor(s)
Abstract(s)
Dissecting diversity patterns of organisms endemic to Iberia has been truly challenging
for a variety of taxa, and the Iberian honey bee is no exception. Surveys of genetic variation in the
Iberian honey bee are among the most extensive for any honey bee subspecies. From these, differential
and complex patterns of diversity have emerged, which have yet to be fully resolved. Here we used
a genome-wide dataset of 309 neutrally-tested single nucleotide polymorphisms (SNPs), scattered
across the 16 honey bee chromosomes, which were genotyped in 711 haploid males. These SNPs
were analyzed along with an intergenic locus of the mtDNA, to reveal historical patterns of population
structure across the entire range of the Iberian honey bee. Overall, patterns of population structure
inferred from nuclear loci by multiple clustering approaches and geographic cline analysis, were
consistent with two major clusters forming a well-defined cline that bisects Iberia along a northeastern-
southwestern axis, a pattern that remarkably parallels that of the mtDNA. While a mechanism of
primary intergradation or isolation by distance could explain the observed clinal variation, our results
are more consistent with an alternative model of secondary contact between divergent populations
previously isolated in glacial refugia, as proposed for a growing list of other Iberian taxa. Despite
current intense honey bee management, human-mediated processes have seemingly played a minor
role in shaping Iberian honey bee genetic structure. This study highlights the complexity of the Iberian
honey bee patterns and reinforces the importance of Iberia as a reservoir of Apis mellifera diversity.
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Citation
Chávez-Galarza, Julio; Henriques, Dora; Johnston, J. Spencer; Carneiro, Miguel; Rufino, José; Patton, John C.; Pinto, M. Alice (2015). Revisiting the Iberian honey bee (Apis mellifera iberiensis) contact zone: maternal and genome-wide nuclear variation provide support for secondary contact from historical refugia. In XI Encontro sobre abelhas. Ribeirão Preto. ISBN 978-85-69903-00-0
Publisher
Moringa Comunicação