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2014 ; 1
(2
): 140202
Nephropedia Template TP
gab.com Text
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Are genes faster than crabs? Mitochondrial introgression exceeds larval dispersal
during population expansion of the invasive crab Carcinus maenas
#MMPMID26064543
Darling JA
; Tsai YH
; Blakeslee AM
; Roman J
R Soc Open Sci
2014[Oct]; 1
(2
): 140202
PMID26064543
show ga
Biological invasions offer unique opportunities to investigate evolutionary
dynamics at the peripheries of expanding populations. Here, we examine genetic
patterns associated with admixture between two distinct invasive lineages of the
European green crab, Carcinus maenas L., independently introduced to the
northwest Atlantic. Previous investigations based on mitochondrial DNA sequences
demonstrated that larval dispersal driven by advective currents could explain
observed southward displacement of an admixture zone between the two invasions.
Comparison of published mitochondrial results with new nuclear data from nine
microsatellite loci, however, reveals striking discordance in their introgression
patterns. Specifically, introgression of mitochondrial genomes relative to
nuclear background suggests that demographic processes such as sex-biased
reproductive dynamics and population size imbalances-and not solely larval
dispersal-play an important role in driving the evolution of the genetic cline.
In particular, the unpredicted introgression of mitochondrial alleles against the
direction of mean larval dispersal in the region is consistent with recent models
invoking similar demographic processes to explain movements of genes into
invading populations. These observations have important implications for
understanding historical shifts in C. maenas range limits, and more generally for
inferences of larval dispersal based on genetic data.