Genetic consequences of anagenetic speciation in Acer okamotoanum (Sapindaceae) on Ullung Island, Korea

Abstract

We hypothesized that genetic consequences of oceanic-endemic plants derived via anagenesis would be quite different from those derived via cladogenesis. Populations of A. okamotoanum form a cluster and are clearly differentiated from A. mono, which suggests a single origin for the anagenetically derived island endemic. No pattern of geographical differentiation of populations occurs in A. okamotoanum, which supports the concept of initial founder populations diverging through time by accumulation of mutations in a relatively uniform environment without further specific differentiation.

Anagenetic speciation in Ullung Island, Korea: genetic diversity and structure in the island endemic species, Acer takesimense (Sapindaceae)

“…The level of genetic variation among populations was also quite low as documented with AMOVA. Such a weak geographical genetic structure within Ullung Island has also been reported in the anagenetically derived species, A. okamotoanum and Dystaenia takesimana (Pfosser et al 2002; Takayama et al 2012). These results are consistent, therefore, with our initial hypothesis on the genetic consequences of anagenetically derived species.…”

“…In Ullung Island, another endemic Acer species, Acer okamotoanum , also showed slightly lower levels of genetic diversity in comparison with its progenitor species in the Korean Peninsula and Japan (Takayama et al 2012). In both endemic species of Acer , recent population size reductions were not clearly detected by statistical tests for bottlenecks based on the allelic distribution, but strong episodes of genetic drift during colonization and speciation on the island were detected, because the F value in STRUCTURE inferred for these island species was quite high.…”

“…Over many generations, sufficient genetic and morphological divergence accrues so that recognition of a new species is warranted. Molecular studies so far completed have revealed higher or only slightly lower levels of genetic variation in two anagenetically derived species, Dystaenia takesimana (Pfosser et al 2005) and Acer okamotoanum (Takayama et al 2012) in Ullung Island, off the coast of Korea, in comparison to their continental progenitors. The endemic species also show no geographical partitioning of the genetic variation within the island.…”

Influence of northern limit range on genetic diversity and structure in a widespread North American tree, sugar maple (Acer saccharumMarshall)

“…() ( H E = 0.689), and other species such as Acer mono Maxim. ( H E = 0.80, range: 0.70–0.85; Kikuchi, Shibata, Tanaka, Yoshimaru, & Niiyama, ; Takayama, Sun, & Stuessy, ) and Acer campestre L. ( H E = 0.602, range: 0.509–0.699; Chybicki, Waldon‐Rudzionek, & Meyza, ; Table ).…”

Relationships and genetic consequences of contrasting modes of speciation among endemic species of Robinsonia (Asteraceae, Senecioneae) of the Juan Fernández Archipelago, Chile, based on AFLPs and SSRs

“…Dystaenia takesimana (Apiaceae) revealed a level of genetic diversity slightly greater than that found in the progenitor D. ibukiensis in Japan (Pfosser et al ., ). Acer okamotoanum (Aceraceae) likewise contained a high level of genetic variation, nearly equal to its close relative A. mono from Korea and Japan (Takayama et al ., ). Acer takesimense , however, has somewhat lower levels of genetic diversity in comparison with populations of A. pseudosieboldianum , also from the Korean Peninsula (Takayama et al ., ).…”