How To Use Speciation In A Sentence
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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.
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This 'making' of new species is known as allopatric speciation and similar patterns are seen with cichlids in the great lakes of Africa.
Practical Fishkeeping
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In particular, Muller anticipated that the antagonistic relationship between selection and recombination would be critical in models of sympatric speciation.
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On average, nodes preceding gene duplications occur earlier in the phylogenetic trees than speciation nodes.
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Thus, whereas the initial evolution of potential radial folds may have been allopatric, in this case there must have been substantial phyletic evolution following speciation that affected the global population.
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Analyses of the age distribution of duplicate genes in diverse flowering plants indicate that essentially all may be paleopolyploids, but this should not be equated with the polyploid speciation rate.
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We are the product of a process of speciation, competition, and ecological change.
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Relatively large genetic distances between populations suggest long periods of isolation and allopatric speciation.
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The minimal definition of macroevolution is “evolution above the species level”, but it has become a catchall term encompassing everything from speciation to lineage-diversification and extinction dynamics to “evolution of ‘higher taxa’” ack! go read “down with phyla!” to vaguely defined “large” amounts of change to evo-devo changes in development.
"Intraspecific macroevolution" within domestic dog breeds - The Panda's Thumb
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These patterns are expected if multiple gene lineages persist in both species since the time of speciation.
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With the advantage of hindsight, it is remarkable that for so many years toxicologists have largely ignored chemical speciation of metals.
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The process that von Buch described now goes by the label allopatric speciation.
The Song of The Dodo
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Issue regarding the Homo sapiens speciation and evolution has been intensively and extensively focused on.
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Tens of thousands of fruit flies have come and gone in laboratory experiments, and every last one of them has remained a fruit fly to the end, all efforts to see the miracle of speciation unavailing.
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Many of us think of evolution as speciation, but populations of insects evolved resistance without budding into new species.
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Another aspect of the rate of evolution involves the amount of morphological change that occurs at speciation or cladogenetic events.
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Invertebrate stocks that colonized Ascension underwent a variety of evolutionary changes including phyletic evolution leading to endemic status, adaptation to subterranean life (Araneae, Pseudoscorpiones, Collembola, and Psocoptera), character release (phorid Diptera), and probably splitting of lineages (speciation) within the island (Isopoda, Collembola, and gryllid Orthoptera).
Ascension scrub and grasslands
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The actual moment when a "daughter" species can (or will) no longer cross-breed with the population from which it sprang (the definition of speciation) is almost impossible to pinpoint, let alone to witness.
New Flavors of Flying Capuchinos
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They better understand the process of speciation, adaptation, and extinction.
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When the lake level rose, in the nineteenth and twentieth centuries, the hills became islands, ranges of hills became archipelagoes, and the process of speciation took off among the cichlids that live in shallow water, known locally as Mbuna.
THE GREATEST SHOW ON EARTH
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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.
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Neo-darwinian theory posits that the genetic basis for speciation is not qualitatively different from that underlying microevolutionary change within populations.
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This is not a measurement technique book, although speciation methods using popular approaches are well represented.
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There are hundreds of cases of evolutionary change observed in progress and dozens of observed speciations.
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Here we use gene genealogies to investigate the phylogeny of recent speciation in the heliconiine butterflies.
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Speciation is a popular research in the field of modern environmental analytical chemistry, in which organometallic speciation is spectacular, especially.
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If most speciation is allopatric, what would we expect to see in terms of the fossil record?
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Paul used this phenomenon known as allopatric speciation to explain the evolution of Hershey Kisses and Snow Caps, both with a similar shape but the latter with a sugar-covered top.
Boing Boing
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From genetical standpoint, speciation is transition from one karyotype norm to another.
On Thursday, the Legg report will be published along with...
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Overall, endemism is quite high in this hotspot because of extensive speciation among several groups of plants, most notably the epiphytes, suggesting that the region was the location of plant refugia during Pleistocene glaciations.
Biological diversity in Tumbes-Chocó-Magdalena
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Located primarily in the hills and mountain ranges of central and eastern Iran, with a small area in Pakistan, this ecoregion represents part of the Irano-Turanian geobotanical region, an especially active center of plant speciation.
Kuhrud-Kohbanan Mountains forest steppe
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Phylogenetic resolution and chronological dating of speciation events in Lycopersicon has proved difficult.
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Semi-congruent splits of an AFLP Neighbor Net link not only A. collina-4x to both diploid species, but some 4x individuals in a polymorphic population with mixed ploidy levels to A. setacea-2x on one hand and to A. collina-4x on the other, indicating allopolyploid speciation as well as hybridization across ploidal levels.
BioMed Central - Latest articles
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For Dawkins, gradualism musts also fit the empirical facts, and the empirical facts on extinctions, speciation and periods of relative stasis are mounting.
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This is a setback for studies of the role of horizontal transfer in niche expansion and speciation.
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Nylonase was a frameshift, much antibiotic and viral drug resistance is due to gene cassettes, transplanted finches develop new beak types in 20 years, multiple instances of plant speciation (same species) in the Pacific NW in the past 60 years …
19th Century Evangelical Scholars, Old Earth and Evolution
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The geological upheavals that divided rivers and river basins provided opportunities for speciation when fish populations were isolated.
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The concept of sympatric speciation by host-race formation remains contentious because of the restrictive conditions that many workers have suggested are required, based on models using assumptions that may not be true.
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Organic chelators that are thought to be of recent biological origin control copper speciation in seawater.
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Attention has focused on a number of problems, including reinforcement, sympatric speciation, and the ecological context of speciation.
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The flora, especially on the limestone which is one of the most active centers of floristic speciation in the Balkans, includes many rare species such as the Pirin poppy, Papaver pirinica, golden aquilegia Aquilegia aurea, yellow gentian Gentiana lutea and edelweiss Leontopodium alpinum.
Pirin National Park, Bulgaria
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In other words, macrogenetic changes might occur suddenly (e.g. polyploidy leading to speciation in plants), but that changes to the overall structure of the organism, changes that require coordinated changes, occurs through evolution by natural selection.
Common Descent & Common Design – An Unexpected Outcome
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And if parents have the same karyotype, this is not a speciation at all.
On Thursday, the Legg report will be published along with...
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Geochemical interaction between the geosphere, hydrosphere and the biosphere depends partly on sorption processes and partly on chemical speciation.
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The term "saltation" implies large leaps, such as sudden speciation.
Scientific Blogging
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In the classic case of allopatric speciation, gene flow is eliminated completely because of a geographic barrier.
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Insights into color perception are often crucial to understanding animal behavior, ecology, and speciation.
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Much of this diversification has occurred recently, creating spectacular examples of adaptive radiation and of speciation in action (table S1).
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Analyses of the age distribution of duplicate genes in diverse flowering plants indicate that essentially all may be paleopolyploids, but this should not be equated with the polyploid speciation rate.
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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.
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The issues to be resolved range from the grander puzzles of human evolution and speciation to parochial matters of subsistence and trade.
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Because of the unusual pattern of speciation preceding extinction, the region contained a mix of extinct and living species through the period of change.
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Because the taxa are not reciprocally monophyletic, we cannot date the actual speciation event.
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One of the chief roles of calls among songbirds is to find mates, and that takes me back to the topic of sympatric speciation.
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In fact, Haldane gives two examples where the evolutionary rates accord with his calculations average rate of speciation in the carnivora, and mammalia on page 522, his conclusion: “the agreement with the theory developed here is satisfactory”.
Haldane's non-dilemma - The Panda's Thumb
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Such barriers are some kind of geographic feature which isolates parts of populations, and leads to allopatric speciation.
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Analyses of the age distribution of duplicate genes in diverse flowering plants indicate that essentially all may be paleopolyploids, but this should not be equated with the polyploid speciation rate.
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Adaptation can occur quickly permitting considerable variation within the limits of the species but loss of genetic information is a known continuing process e.g.telemeres; this eventually leads to intersterility within the species but it is not speciation.
Why the new Darwin Debate is Good News | PopPolitics.com
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If the arctic host populations become fragmented due to the northward expansion of southern biogeographic elements, extinction of parasites in small host populations and/or cryptic speciation (isolation events seen in parasites, often only by using molecular methods, that are not evident in host populations) in refugia are likely to follow.
Effects of changes in climate and UV radiation levels on structure of arctic ecosystems in the short and long term
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Macropodine marsupials (kangaroos and wallabies) offer unique insights into current theories expositing centromere emergence during karyotypic diversification and speciation.
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But the far more vital part of evolutionary theory (or "Darwinism", as the evangelicals call it, if any creationists are still reading) is the idea of allopatric speciation.
David Horton: Keep Evolution Out of Schools
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I have no competence to debate his scientific ideas - if speciation is mostly allopatric, or if it is sympatric, or something else, that is not a philosophical matter.
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The timescale is a fudge (evolution's probably not that quick), and you have to be willing to take the mental leap to accepting this type of speciation in humans (it helps to know that eusociality is possible in mammalian species--Baxter's example is naked mole rats); but once you swallow those lumps, he does get most of the details right.
Archive 2004-11-01
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Speciation occurred in areas that became widely separated, perhaps driven by the geographic complexity of nearshore basins and submarine platforms.
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Finally, this book highlights and prioritizes gaps in our current understanding of speciation.
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While this reclassification is still unknown, it is a debatable subject as the actual speciation of cougars is debated in and of itself.
Archive 2007-03-01
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Finally, we propose a biogeographical hypothesis of speciation events within the N. mediocris species complex.
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As stated in our article, scanty parasites and Plasmodium falciparum gametocytes may be easier to detect in thick films and therefore might be of value in low infections and in P falciparum speciation.
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However, species may hybridize long after speciation, which may pose problems in phylogenetic reconstruction, especially when molecular data are used.
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A more recent and equally ambitious synthesis, informally known as evo-devo, has been proposed between theories of evolution (of reproduction and speciation) and theories of development (of formation and growth, such as embryology) (Goodwin, Holder and Wylie 1983;
The Unity of Science
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If final speciation was not done on site, participants were asked to identify their reference laboratory.
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Indeed, sympatric speciation events have been observed in controlled experiments, under natural conditions, and also demonstrated by simulation models.
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He describes saltationism, which is what I think Alan is referring to, extremely exaggerates the evolutionary role of saltations, considering these to be the main factor of speciation and macroevolution.
Common Descent & Common Design – An Unexpected Outcome
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Overall, these data reflect a protracted history of speciation throughout the Pleistocene and Pliocene’ (pp. 1666-1667), and they termed the LPO model ‘a failed paradigm’.
Archive 2006-03-01
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Wilson for his part was strong on myrmecology, on biogeography, and on speciation theory.
The Song of The Dodo
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In other words, macrogenetic changes might occur suddenly (polyploidy leading to speciation in plants), but that changes to the overall structure of the organism, changes that require coordinated changes, occurs through evolution by natural selection.
Common Descent & Common Design – An Unexpected Outcome
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The creation of a new species is known as speciation.
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Branches and nodes are color-coded to represent genetic divergences arising from speciation events.
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The possibility of uncovering conflicting gene genealogies in taxa that were separated a long time in the past but whose speciation has occurred close in time has already been discussed.
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Nor can we equate revolutions simply with speciation in Darwin's own sense, given that Darwin's favorite mechanism of speciation was anagenesis, not cladogenesis ” just the long-term adaptive evolution within a single line rather than the splitting of lines.
Scientific Revolutions
