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    The process of speciation, which has been studied by biologist for centuries, is difficult to explain. Speciation is the process of forming a new species. Charles Darwin is one of the most famous persons to study different species and how natural selection had an effect on evolution; however he never discussed how one species gives rise to another. It is known that there are theories of how speciation takes place. The four models for speciation are allopatric, sympatric, peripatric, and parapatric

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    Varying Patterns of Speciation

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    Varying Patterns of Speciation Wallace’s line, located in the Malay-Archipelago, is one of the best known and most studied boundaries of zoogeography in the world. It is a transition zone between the islands of Borneo and Sulawesi and the islands of Bali and Lombork, which marks both the convergence and division of the diverse flora and fauna found in the Asian (Borneo, The Philippines, and Western Indonesia), and the Australian regions (Sulawesi, Eastern Indonesia, Australia, and New Guinea)

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    are unique in that the different species in this lineage all live in extremely similar environments, but show strong differentiation in behavioral and morphometric characteristics. Interestingly, Hawaiian cave planthoppers rank among the highest speciation rates among all animal species, which contradicts the prior assumption of the limited evolutionary potential of obligate cavernicoles. Furthermore, the differentiation between the species is random with regard to cave age and geographic distribution

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    Before tackling the issue of the level at which speciation occurs as the result of divergence, we must first establish the definition of speciation. In the scientific community, this terminology is associated with the formation of new and distinctive species, from which a single evolutionary line splits into two or more genetically independent ones (Cook 1906). In essence, from one common ancestor derives two descendent species. Taking into consideration the controversial nature of what constitute

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    A Closer Look at Lucy: Sexual Dimorphism and Speciation in Australopithecus In his peer-reviewed article, “Sexing fossils: a boy named Lucy?,” James Shreeve discusses, in detail, a study on sexual dimorphism and possible speciation in Australopithecines in Hadar, Ethiopia, based on the famous A. afarensis specimen, “Lucy.” In the article, “Lucy’s kind takes humanlike turn,” the author addresses sexual dimorphism and speculates on sex-based differences in behaviors in A. afarensis. The two articles

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    Evolution Is

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    naturalists—those evolutionists who include natural selection in their explanations and who comprise a strong majority of evolutionist voices today—now entered a sort of evolutionary stasis? Not yet. For example, consider Mayr's central theory of speciation as it applies to a creative species such as humans. There are cultural and creative aspects of our so-called "higher level" species that have the potential to perturb whether and how new species taxa might evolve from homo sapiens: mobility and

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    Macro Ecology Essay

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    parapatric speciation favored by topographic complexity and climatic zonation (Kozak and Wiens, 2010). Two hypotheses gas been put forward in an attempt to explain 2. Montane museum hypothesis- Montane regions have higher species richness at intermediate level simply because these elevation was occupied for the longest time which means high time for speciation and accumulation of species (Kozak and Wiens, 2010). In their study, (Kozak and Wiens, 2010), have shown that Time-for-speciation plays important

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    enormously to the topic of speciation, they had two totally different views on the main mechanism driving it. Darwin noticed geographic isolation but discounted any importance in it believing natural selection to be the driving force, while Mayr believed that geographic isolation was the driving force of speciation and founded the theory of allopatric speciation. For decades Mayr's idea has been the traditional method thought to result in the highest amount of speciation, but recent support has shifted

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    (Kobashi & Kawamura 2002). Organism Hawaii... ... middle of paper ... ...e, sympatry and speciation. Journal of Evolutionary Biology, vol. 22: 2332–2341. Qiu, B., Koh, D., Lumpkin, C., et al. (1997) Existance and formation mechinism the North Hawaiian Ridge current. Jornal of Physical Oceanography, vol. 27: 431-444. Rice, A. M. and Pfennig, D. W. (2010), Does character displacement initiate speciation? Evidence of reduced gene flow between populations experiencing divergent selection. Journal

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    Speciation

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    Introduction This experiment has helped us develop a better understanding that is aligned with the standards, and key science concepts that we have learned in lecture. As a class, we have learned about Darwin and the ideas on the theory of evolution. Speciation involves genetic differentiation, ecological differentiation and reproductive isolation. We will be playing the role of scientists by using a variety of criteria to compare explanations and select the best biodiversity framework for the given data

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