Premium
Biogeography and genetic consequences of anagenetic speciation of R haphithamnus venustus ( V erbenaceae) in the J uan F ernández archipelago, C hile: insights from AFLP and SSR markers
Author(s) -
Lópezsepúlveda Patricio,
Takayama Koji,
Crawford Daniel J.,
Greimler Josef,
Peñailillo Patricio,
Baeza Marcelo,
Ruiz Eduardo,
Kohl Gudrun,
Tremetsberger Karin,
Gatica Alejandro,
Letelier Luis,
Novoa Patricio,
Novak Johannes,
Stuessy Tod F.
Publication year - 2017
Publication title -
plant species biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.419
H-Index - 36
eISSN - 1442-1984
pISSN - 0913-557X
DOI - 10.1111/1442-1984.12144
Subject(s) - biology , archipelago , genetic diversity , insular biogeography , genetic algorithm , biogeography , amplified fragment length polymorphism , ecology , genus , evolutionary biology , zoology , population , demography , sociology
The genus R haphithamnus ( V erbenaceae) consists of two species, one in S outh A merica and another endemic to the J uan F ernández archipelago, C hile. The genus represents an example of anagenetic speciation in which the island populations have diverged from their colonizing ancestors to the point where they are recognized as a distinct species. The island species R haphithamnus venustus differs from the continental R . spinosus primarily by floral traits associated with adaptation to hummingbird pollination. Two molecular markers, amplified fragment length polymorphisms ( AFLP s) and microsatellites, were used to estimate divergence between the continental and insular species, and to compare diversity in the two species. The comparable or greater diversity in the insular species observed in some diversity indices of AFLP s would support the hypothesis that during the course of anagenetic speciation it has recovered from any reduction of genetic diversity associated with colonization of the archipelago. This pattern of comparable or higher diversity in insular species is seen with other instances of anagenetic speciation in the J uan F ernández archipelago. By contrast, the lower genetic diversity in the insular R . venustus found in microsatellites is likely to be the result of a founder effect from the original colonization of the archipelago; prior molecular studies suggest recent colonization of the J uan F ernández archipelago by R haphithamnus . The seeming non‐concordance between the present results and the widely accepted biogeography of R haphithamnus inferred from other data is discussed and an explanation is presented.