How to use speciation in a sentence

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Sentence Examples We are the product of a process of speciation, competition, and ecological change. Here we use gene genealogies to investigate the phylogeny of recent speciation in the heliconiine butterflies. Besides researching thrips, he studies speciation and asexuality in walking sticks and the phylogenetics of Galapagos Islands snails. They better understand the process of speciation, adaptation, and extinction. Over the long-term, appearance of new species may result from speciation and adaptive radiation. Such barriers are some kind of geographic feature which isolates parts of populations, and leads to allopatric speciation. If most speciation is allopatric, what would we expect to see in terms of the fossil record? Relatively large genetic distances between populations suggest long periods of isolation and allopatric speciation. In the classic case of allopatric speciation, gene flow is eliminated completely because of a geographic barrier. The Yule process can be seen as modeling origination of evolutionary lineages due to speciation. These patterns are expected if multiple gene lineages persist in both species since the time of speciation. Fruit flies have served as a prime model system in research on the effect of mate choice and assortative mating on speciation. With the advantage of hindsight, it is remarkable that for so many years toxicologists have largely ignored chemical speciation of metals. Finally, we propose a biogeographical hypothesis of speciation events within the N. mediocris species complex. The geological upheavals that divided rivers and river basins provided opportunities for speciation when fish populations were isolated. Branches and nodes are color-coded to represent genetic divergences arising from speciation events. Many of us think of evolution as speciation, but populations of insects evolved resistance without budding into new species. If final speciation was not done on site, participants were asked to identify their reference laboratory. Special symposia also feature laser based spectrochemistry, speciation analysis, and fundamental and instrumentation developments. On average, nodes preceding gene duplications occur earlier in the phylogenetic trees than speciation nodes. Show More Sentences The issues to be resolved range from the grander puzzles of human evolution and speciation to parochial matters of subsistence and trade. Organic chelators that are thought to be of recent biological origin control copper speciation in seawater. One of the chief roles of calls among songbirds is to find mates, and that takes me back to the topic of sympatric speciation. This is a setback for studies of the role of horizontal transfer in niche expansion and speciation. Phylogenetic resolution and chronological dating of speciation events in Lycopersicon has proved difficult. Attention has focused on a number of problems, including reinforcement, sympatric speciation, and the ecological context of speciation. Another aspect of the rate of evolution involves the amount of morphological change that occurs at speciation or cladogenetic events. Insights into color perception are often crucial to understanding animal behavior, ecology, and speciation. Because the taxa are not reciprocally monophyletic, we cannot date the actual speciation event. Finally, this book highlights and prioritizes gaps in our current understanding of speciation. His fields of interest include systematic botany, speciation, and pteridology. I didn't mention punctuated equilibrium or allopatric speciation either, because it isn't relevant to the matter at hand. Likewise, founder effect has been discounted as the primary mode of speciation among Darwin's finches since the discovery of extensive MHC variability in these species. For Dawkins, gradualism musts also fit the empirical facts, and the empirical facts on extinctions, speciation and periods of relative stasis are mounting. Geochemical interaction between the geosphere, hydrosphere and the biosphere depends partly on sorption processes and partly on chemical speciation. They conclude that sympatric speciation is possible, but only when there is some kind of environmental heterogeneity that is sufficient to interfere with gene flow. Because of the unusual pattern of speciation preceding extinction, the region contained a mix of extinct and living species through the period of change. However, species may hybridize long after speciation, which may pose problems in phylogenetic reconstruction, especially when molecular data are used. The lasting contribution of the book is in its summary of avian distributions and natural history, not in the phylogenetic interpretation of speciation and biogeography. Macropodine marsupials offer unique insights into current theories expositing centromere emergence during karyotypic diversification and speciation. Show More Sentences Thus, nowadays, these four species represent progressive stages of late speciation and constitute an excellent example of ecological speciation and adaptive radiation. These markers will be used to estimate interbreeding between field populations of the two developmental morphs to assess whether there is any evidence of speciation. Neo-darwinian theory posits that the genetic basis for speciation is not qualitatively different from that underlying microevolutionary change within populations. In particular, Muller anticipated that the antagonistic relationship between selection and recombination would be critical in models of sympatric speciation. Indeed, sympatric speciation events have been observed in controlled experiments, under natural conditions, and also demonstrated by simulation models. Demographic history appears to have been stable for the auklets throughout the past several million years, and a founder effect associated with their speciation is unlikely. Does niche divergence accompany allopatric divergence in Aphelocoma jays as predicted under ecological speciation? Historical allopatry and the biogeography of speciation in the prosobranch snail genus Nucella. The observed strong phenotypic similarity was preserved under speciation through complete allopatry. I crave the deep forests there, the endless speciation and fruiting bodies. In sexually reproducing organisms, speciation results from reproductive isolation followed by genealogical divergence. In various ways these ecological adaptations can lead to assortative mating and possible speciation. Insertion polymorphisms of SINE200 retrotransposons within speciation islands of Anopheles gambiae molecular forms. Thus the multi and unicellular eukaryote with its genes serves the purpose of viral speciation. Existing patterns of biodiversity have been shaped both by speciation and by extinction. The only way to ensure correct speciation is to subculture the organism and purify it for further characterization. Unfortunately, the authors do not provide data that allow one to determine whether speciation was facilitated by the examination of thick films. Qualitative assessment of these fractions involves speciation of both the soil solution and the particulate-bound species of the soils. Sherrard JC, Hunter KA, Boyd PW Selenium speciation in subantarctic and subtropical waters east of New Zealand. One example is the grass Anthoxanthum odoratum, which can undergo parapatric speciation in response to localised metal pollution from mines. Show More Sentences Finally, in sympatric speciation species diverge without geographic isolation or changes in habitat. One type of sympatric speciation involves crossbreeding of two related species to produce a new hybrid species. Extinction is not an unusual event, as species regularly appear through speciation and disappear through extinction. Current species are a stage in the process of evolution, with their diversity the product of a long series of speciation and extinction events. In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. Also, the speciation rate in many groups was reduced to between a fifth and a third of previous levels. Its phenotypic variations may be indicative of a speciation event, as opposed to phenotypic plasticity. The evolutionary process by which biological populations evolve to become distinct species is called speciation. Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book The Origin of Species. It occurs when the rate of extinction increases with respect to the rate of speciation. The Grande Coupure is characterized by widespread extinctions and allopatric speciation in small isolated relict populations. Such whole genome sequencing projects allow for studies on evolutionary processes involved in speciation. The Congo's formation may have led to the allopatric speciation of the bonobo and the common chimpanzee from their most recent common ancestor. Rather, speciation is now thought to have occurred as a result of a subsequent wide dispersal of its range. In both groups, however, we find copious and intricate speciation so that, often, species limits are narrow and ill defined. There is some evidence of sympatric speciation of cichlid fish in small African crater lakes. From my study of dabbling ducks, I have come to believe that formation of hybrids is common during speciation events. Phyletic evolution and iterative speciation in the persistent Pristiograptus dubius lineage. This differs from allopatric speciation in that the isolated populations are numerically much smaller than the parental population. Instead, speciation results from the evolution of mechanisms that reduce gene flow between the two populations. Show More Sentences Our methodology can be used for DNA extraction for molecular studies for isolation, speciation and drug susceptibility testing of these deadly pathogens. An example of such a speciation event is when the plant species Arabidopsis thaliana and Arabidopsis arenosa crossbred to give the new species Arabidopsis suecica. The secondary contact phase of allopatric speciation in Darwin's finches. Birds that are related, such as Darwin's finches, but that vary in beak size and behavior specially evolved to their habitat are examples of a process called speciation. The evolutionary processes driving patterns of genetic diversity and differentiation, and ultimately leading to speciation, are poorly understood. Eggert thinks the elephants' speciation began more than 2 million years ago, when West African elephants migrated away from central and southern African relatives. New species evolve from previous species via a speciation process. Flow injecton method for the rapid determination of chemical oxygen demand based on microwave digestion and chromium speciation in flame atomic-absorption spectrometry. The most common in animals is allopatric speciation, which occurs in populations initially isolated geographically, such as by habitat fragmentation or migration. The second mechanism of speciation is peripatric speciation, which occurs when small populations of organisms become isolated in a new environment. Contrary to previous supposition, the evolutionary speciation of this genus is no longer thought to have occurred with the breakup of Gondwana through continental drift. Here, the founder effect causes rapid speciation after an increase in inbreeding increases selection on homozygotes, leading to rapid genetic change. This is similar to peripatric speciation in that a small population enters a new habitat, but differs in that there is no physical separation between these two populations. In allopatric speciation, individuals of a species become geographically isolated from each other by external factors such as mountains or estuaries. The problem does not occur in allopatric speciation with geographically separated populations, which can diverge with different sets of mutations. This occurs most easily in allopatric speciation, where populations are separated geographically and can diverge gradually as mutations accumulate. Statistical analysis of marine losses at this time suggests that the decrease in diversity was caused more by a decrease in speciation than by an increase in extinctions. Examples from Classical Literature According to present-day concepts of variation and speciation, Andersen's criteria are artificial. Additional remarks on the distribution of this species are in the section on Zoogeography and speciation. In fact, isolation is a most important factor in speciation of insular populations. Natural selection plus geographical and ecological isolation has undoubtedly been operative in speciation and in subspeciation. The process of speciation within insular populations has been discussed by many authors. Isolation of small populations is probably the most influential factor in the process of speciation in insular organisms. Volatile speciation, water activity and oxygen fugacity will be also measured. Find more words! 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Words that rhyme with speciation What is the plural of speciation? What is the adverb for speciation? What is the adjective for speciation? What is the noun for speciation? Use our Sentence Generator Nearby Words speciate specialty special treatment specialties special session specials speciations specie species species' species diversity speciesism 10-letter Words Starting With s sp spe spec speci specia speciat speciati speciatio