Biogeography and genetic consequences of anagenetic speciation of<scp><i>R</i></scp><i>haphithamnus venustus</i>(<scp>V</scp>erbenaceae) in the<scp>J</scp>uan<scp>F</scp>ernández archipelago,<scp>C</scp>hile: insights from<scp>AFLP</scp>and<scp>SSR</scp>markers

López-Sepúlveda, Patricio; Takayama, Kōji; Crawford, Daniel J.; Greimler, Josef; Peñailillo, Patricio; Baeza, Marcelo; Ruíz, Eduardo; Köhl, Gudrun; Tremetsberger, Karin; Gatica, Alejandro; Letelier, Luis; Novoa, Patricio; Novak, Johannes; Stuessy, Tod F.

doi:10.1111/1442-1984.12144

Cited by 4 publications

(3 citation statements)

References 91 publications

(147 reference statements)

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“…It would not be surprising if this were also the case with the other two genera. In fact, in Rhaphithamnus , divergence in neutral genetic markers is greater between populations in the two islands than between either and the continental sister species (López-Sepúlveda et al 2016 ). Despite the divergence between the islands, no morphological differences have been detected.…”

Section: Endemic Angiosperms In the Juan Fernández Islandsmentioning

confidence: 99%

Factors driving adaptive radiation in plants of oceanic islands: a case study from the Juan Fernández Archipelago

et al. 2018

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Adaptive radiation is a common evolutionary phenomenon in oceanic islands. From one successful immigrant population, dispersal into different island environments and directional selection can rapidly yield a series of morphologically distinct species, each adapted to its own particular environment. Not all island immigrants, however, follow this evolutionary pathway. Others successfully arrive and establish viable populations, but they remain in the same ecological zone and only slowly diverge over millions of years. This transformational speciation, or anagenesis, is also common in oceanic archipelagos. The critical question is why do some groups radiate adaptively and others not? The Juan Fernández Islands contain 105 endemic taxa of angiosperms, 49% of which have originated by adaptive radiation (cladogenesis) and 51% by anagenesis, hence providing an opportunity to examine characteristics of taxa that have undergone both types of speciation in the same general island environment. Life form, dispersal mode, and total number of species in progenitors (genera) of endemic angiosperms in the archipelago were investigated from literature sources and compared with modes of speciation (cladogenesis vs. anagenesis). It is suggested that immigrants tending to undergo adaptive radiation are herbaceous perennial herbs, with leaky self-incompatible breeding systems, good intra-island dispersal capabilities, and flexible structural and physiological systems. Perhaps more importantly, the progenitors of adaptively radiated groups in islands are those that have already been successful in adaptations to different environments in source areas, and which have also undergone eco-geographic speciation. Evolutionary success via adaptive radiation in oceanic islands, therefore, is less a novel feature of island lineages but rather a continuation of tendency for successful adaptive speciation in lineages of continental source regions.

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Section: Endemic Angiosperms In the Juan Fernández Islandsmentioning

confidence: 99%

Factors driving adaptive radiation in plants of oceanic islands: a case study from the Juan Fernández Archipelago

et al. 2018

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“…This mode of speciation involves an initial founding population on an island, which gradually accumulates genetic variation by mutation and recombination and eventually, without any splitting events, transforms into morphologically and genetically distinct taxonomic forms [1,2]. Unlike the numerous examples of adaptive radiation, the mode of anagenetic speciation on oceanic islands have recently been investigated by a few research groups, primarily in the Juan Fernández Islands in the Pacific [17,20–22] and Ulleung Island in East Asia [23–26].…”

Section: Introductionmentioning

confidence: 99%

Multiple origins and the population genetic structure of Rubus takesimensis (Rosaceae) on Ulleung Island: Implications for the genetic consequences of anagenetic speciation

et al. 2019

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To determine the origin and genetic consequences of anagenesis in Rubus takesimensis on Ulleung Island, Korea, we compared the genetic diversity and population structure of R. takesimensis with those of its continental progenitor R. crataegifolius. We broadly sampled a total of 315 accessions in 35 populations and sequenced five noncoding regions of chloroplast DNA. Rubus takesimensis emerged as nonmonophyletic and several geographically diverse continental populations were likely responsible for the origin of R. takesimensis; the majority of R. takesimensis accessions were sisters to the clade containing accessions of R. crataegifolius, primarily from the Korean peninsula, while rare accessions from three populations shared common ancestors with the ones from the southern part of the Korean peninsula, Jeju Island, and Japan. A few accessions from the Chusan population originated independently from the Korean peninsula. Of 129 haplotypes, 81 and 48 were found exclusively in R. crataegifolius and R. takesimensis, respectively. We found unusually high genetic diversity in two regions on Ulleung Island and no geographic population structure. For R. crataegifolius, two major haplotype groups were found; one for the northern mainland Korean peninsula, and the other for the southern Korean peninsula and the Japanese archipelago. Compared with populations of R. crataegifolius sampled from Japan, much higher haplotype diversity was found in populations from the Korean peninsula. The patterns of genetic consequences in R. takesimensis need to be verified for other endemic species based on chloroplast DNA and independent nuclear markers to synthesize emerging patterns of anagenetic speciation on Ulleung Island.

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“…It has been pointed out that pollination by birds may be essential in areas where the activity of insects is low, such as oceanic islands (e.g., Dupont et al, 2004; Feinsinger et al, 1982; López‐sepúlveda et al, 2017). Bees and butterflies are frequently reported as pollinators of Orobanchaceae species in continental areas.…”

Section: Discussionmentioning

confidence: 99%

First record of potential bird pollination in the holoparasitic genus Orobanche L.

Nishimura

Takayama

2022

Plant Species Biology

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Pollinators play an important role in the reproduction of zoophilous plants. A shift in pollinators has often been observed for oceanic island plants, probably because of the differences in fauna. In this study, we obtained data on pollinator shifts from insects to birds in Orobanche boninsimae (Orobanchaceae), a holoparasitic plant species endemic to the Bonin (Ogasawara) Islands, oceanic islands in the Pacific. We observed pollination and measured seed viability in O. boninsimae and its continental sister species O. coerulescens. We found that two passerine birds, the Japanese white‐eye (Zosterops japonicus) and bulbul (Hypsipetes amaurotis squameiceps), visited the flowers and sucked the nectar of O. boninsimae, while only insects visited those of O. coerulescens. Viable seeds were produced under pollinator‐excluded treatments in the two Orobanche species, indicating that the seeds were produced by automatic self‐pollination and/or apomixis. These results suggest that O. boninsimae may be pollinated by birds and can produce seeds by automatic self‐pollination/apomixis. This is the first record of visitation of the genus Orobanche by birds. Studies of pollination systems in native plants on the Bonin Islands are few compared to those on other oceanic islands, and O. boninsimae may provide a valuable example of pollinator shifts in the Bonin Islands.

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Biogeography and genetic consequences of anagenetic speciation ofRhaphithamnus venustus(Verbenaceae) in theJuanFernández archipelago,Chile: insights fromAFLPandSSRmarkers

Cited by 4 publications

References 91 publications

Factors driving adaptive radiation in plants of oceanic islands: a case study from the Juan Fernández Archipelago

Factors driving adaptive radiation in plants of oceanic islands: a case study from the Juan Fernández Archipelago

Multiple origins and the population genetic structure of Rubus takesimensis (Rosaceae) on Ulleung Island: Implications for the genetic consequences of anagenetic speciation

First record of potential bird pollination in the holoparasitic genus Orobanche L.

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