Anagenetic evolution in island plants
نویسندگان
چکیده
The origin of new species on oceanic islands has been discussed on many occasions (Carlquist, 1974; Grant, 1996). The most commonly described process is speciation associated with adaptive radiation (Stuessy & Ono, 1998; Schluter, 2000), in which from a single introduction several lines of speciation occur, each driven by selection within markedly different ecological zones. Morphological divergence among species in this process is often dramatic, but overall genetic differentiation Department of Systematic and Evolutionary Botany, Institute of Botany, University of Vienna, Vienna, Austria, Departamento de Ecologı́a Vegetal (Botánica), Universidad de Sevilla, Sevilla 41012, Spain, Biologiezentrum, Landesmuseum, Johann-Wilhelm-KleinStrasse 73, Linz 4010, Austria, Department of Botany, Faculty of Science, Charles University, Prague 11636, Czech Republic, Faculty of Biological Sciences, College of Natural Sciences, Chonbuk National University, Chonju, South Korea and Makino Herbarium, Tokyo Metropolitan University, Hachioji, Tokyo, Japan
منابع مشابه
The anagenetic world of spore-producing land plants.
A fundamental challenge to our understanding of biodiversity is to explain why some groups of species diversify, whereas others do not. On islands, the gradual evolution of a new species from a founder event has been called 'anagenetic speciation'. This process does not lead to rapid and extensive speciation within lineages and has received little attention. Based on a survey of the endemic bry...
متن کاملPhylogenetic evidence for cladogenetic polyploidization in land plants.
PREMISE OF THE STUDY Polyploidization is a common and recurring phenomenon in plants and is often thought to be a mechanism of "instant speciation". Whether polyploidization is associated with the formation of new species (cladogenesis) or simply occurs over time within a lineage (anagenesis), however, has never been assessed systematically. METHODS We tested this hypothesis using phylogeneti...
متن کاملPredation as the primary selective force in recurrent evolution of gigantism in Poecilozonites land snails in Quaternary Bermuda.
During the last half million years, pulses of gigantism in the anagenetic lineage of land snails of the subgenus Poecilozonites on Bermuda were correlated with glacial periods when lower sea level resulted in an island nearly an order of magnitude larger than at present. During those periods, the island was colonized by large vertebrate predators that created selection pressure for large size a...
متن کاملGenetic consequences of cladogenetic vs. anagenetic speciation in endemic plants of oceanic islands
Adaptive radiation is a common mode of speciation among plants endemic to oceanic islands. This pattern is one of cladogenesis, or splitting of the founder population, into diverse lineages in divergent habitats. In contrast, endemic species have also evolved primarily by simple transformations from progenitors in source regions. This is anagenesis, whereby the founding population changes genet...
متن کاملPopulation size and molecular evolution on islands.
The nearly neutral theory predicts that the rate and pattern of molecular evolution will be influenced by effective population size (Ne), because in small populations more slightly deleterious mutations are expected to drift to fixation. This important prediction has not been widely empirically tested, largely because of the difficulty of comparing rates of molecular evolution in sufficient num...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006