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Previous studies using partial regression Mantel tests of matrix
correspondence on within-island geographic variation in the color pattern
of the Tenerife (Canary Islands) lacertid lizard (Gallotia galloti)
support natural selection for different north--south climatically
determined biotopes but do not support any historical cause. However,
tests on the DNA phylogeny based primarily on population data from 57
localities on Tenerife support the hypothesis that there were populations
on two putative precursor islands that have come into secondary contact
and introgressed after these islands were joined to form Tenerife by the
eruption of the Canadas edifice. Subsequent partial Mantel tests continue
to support the hypothesis that color pattern is adapted to the climatic
biotopes even when this phylogenetic information is taken into account by
(1) testing for color pattern adaptation separately within each lineage
and (2) testing for color pattern adaptation across the entire island
while considering the molecular phylogenetic relationships as representing
an alternative explanation. Selection has largely expunged any trace of
the geological history from current morphological variation, and the
introgression of these island populations after an estimated 0.7 million
years of separation gives an insight into the relationships between
allopatric divergence and reproductive isolation.
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