If C. conco and C. lividus are now adapted to different habitats (i.e.
different preys), they are no longer competitors (Quenouille et al.,
2011) and there is no simple explanation why C. lividus is absent
from the Marquesas Islands. Alternatively, the divergence may also
be the result of a peripatric speciation event, where a small peripheral
population of C. lividus colonized the Marquesas Islands, in
agreement with the geographic distribution of the two species.