Download or read book Speciation in salamanders of the plethodontid genus Ensatina written by Robert Cyril Stebbins and published by . This book was released on 1949 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Speciation in Salamanders of the Plethodontid Genus Ensatina written by Robert C. Stebbins and published by . This book was released on 1949 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Biology of Plethodontid Salamanders written by Richard C. Bruce and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers a state-of-the-art overview of plethodontid salamanders. Readers will find the best current understanding of many aspects of the evolution, systematics, development, morphology, life history, ecology, and field methodology of these animals.

Download or read book The Dividing Link written by Thomas James Devitt and published by . This book was released on 2010 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plethodontid salamanders of the Ensatina eschscholtzii complex have received special attention from evolutionary biologists because they represent one of the very few examples of a ring species, a case where two reproductively isolated forms are connected by a chain of intergrading populations surrounding a central geographic barrier. Ensatina has become a textbook example of speciation, yet there still remain fundamental gaps in our knowledge of this fascinating system. In this study, consisting of three components, I extend previous work on the Ensatina complex in new directions. In Chapter 1, I conducted a fine-scale genetic analysis of a hybrid zone between the geographically terminal forms of the ring using Bayesian methods for hybrid identification and classification in combination with mathematical cline analyses. F1s and pure parentals dominated the sample. Cline widths were concordant and narrow with respect to dispersal, but there is cytonuclear discordance, both in terms of introgression and the geographic position of mitochondrial versus nuclear clines. Nearly all hybrids possess mitochondrial DNA from one parental type (klauberi suggesting isolation is asymmetrical. Selection against hybrids is inferred to be strong (2̃1%), but whether this selection is endogenous (genetically-based) or exogenous (environmentally-based) remains to be tested. In Chapter 2, I investigated the role of late Quaternary climate change on phylogeographic patterns within the Large-blotched Ensatina (Ensatina eschscholtzii klauberi). Intersecting species distribution models constructed under current climatic conditions, as well as two different historical time periods (Last Glacial Maximum, 21 ka and mid-Holocene, 6 ka), predicted stable refugial areas where the species may have persisted throughout climatic fluctuations. Significant phylogeographic structure exists, but geographic structuring of genetic variation by refugia was not supported. Results suggest that populations in putative refugia have not been isolated for very long, or that gene flow may have masked any earlier periods of divergence in allopatry. In Chapter 3, I conducted a multilocus phylogeographic analysis of the entire Ensatina eschscholtzii complex to reexamine previous phylogenetic hypotheses based on mitochondrial DNA alone. A concatenation approach was used in addition to newer methods that model the relationship between the species tree and the gene trees embedded within them. The concatenated tree was similar to previous mitochondrial trees, identifying well-supported coastal and inland clades, and recovering oregonensis and platensis as paraphyletic. The concatenated tree was not well resolved at the base. Basal relationships recovered by the species tree were well resolved, but most relationships were not well supported compared to the concatenated tree. Results are generally consistent with previous efforts based on mtDNA, but provide further resolution to the Ensatina phylogeny, while highlighting the difficult nature of inferring species trees from samples of closely related populations that are experiencing gene flow.

Download or read book Natural History of the Salamanders of the Plethodontid Genus Ensatina written by Robert C. Stebbins and published by . This book was released on 1954 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Natural history of Salamanders of the Plethodontid Genus Ensatina written by Robert C. Stebbins and published by . This book was released on 1954 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hybridization Among the Subspecies of the Plethodontid Salamander Ensatina Eschscholtzi written by Charles William Brown and published by . This book was released on 1974 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Natural History of the Salamanders of the Plethodontid Genus Ensatina written by Robert C. Stebbins and published by . This book was released on 1954 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Natural History of the Salamanders of the Plethodontid Genus Ensatina by Robert C Stebbins written by Robert Cyril Stebbins and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Salamanders of the Family Plethodontidae written by Emmett Reid Dunn and published by . This book was released on 1926 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Why Evolution is True written by Jerry A. Coyne and published by OUP Oxford. This book was released on 2010-01-14 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: For all the discussion in the media about creationism and 'Intelligent Design', virtually nothing has been said about the evidence in question - the evidence for evolution by natural selection. Yet, as this succinct and important book shows, that evidence is vast, varied, and magnificent, and drawn from many disparate fields of science. The very latest research is uncovering a stream of evidence revealing evolution in action - from the actual observation of a species splitting into two, to new fossil discoveries, to the deciphering of the evidence stored in our genome. Why Evolution is True weaves together the many threads of modern work in genetics, palaeontology, geology, molecular biology, anatomy, and development to demonstrate the 'indelible stamp' of the processes first proposed by Darwin. It is a crisp, lucid, and accessible statement that will leave no one with an open mind in any doubt about the truth of evolution.

Download or read book Evolutionary Studies of the Plethodontid Salamander Genus Batrachoseps written by Kay Philbrick Yanev and published by . This book was released on 1978 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A New Genus and Species of Plethodontid Salamander from Chiapas Mexico written by David B. Wake and published by . This book was released on 1989 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Amphibians of Western North America written by Robert C. Stebbins and published by Univ of California Press. This book was released on 2023-12-22 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived makes high-quality, peer-reviewed scholarship accessible once again using print-on-demand technology. This title was originally published in 1951. This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived

Download or read book Water Economy in Two Species of Plethodontid Salamander written by Samantha Mara Wisely and published by . This book was released on 1997 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microdistribution of Two Sympatric Species of Plethodontid Salamanders written by Thomas Kyle Pauley and published by . This book was released on 1977 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Species and Speciation in the Fossil Record written by Warren D. Allmon and published by University of Chicago Press. This book was released on 2016-10-05 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: The literature of paleobiology is brimming with qualifiers and cautions about using species in the fossil record, or equating such species with those recognized among living organisms. Species and Speciation in the Fossil Record digs through this literature and surveys the recent research on species in paleobiology. In these pages, experts in the field examine what they think species are - in their particular taxon of specialty or more generally in the fossil record. They also reflect on what the answers mean for thinking about species in macroevolution. The first step in this approach is an overview of the Modern Synthesis, and paleobiology’s development of quantitative ways of documenting and analyzing variation with fossil assemblages. Following that, this volume’s central chapters explore the challenges of recognizing and defining species from fossil specimens, and show how with careful interpretation and a clear species concept, fossil species may be sufficiently robust for meaningful paleobiological analyses. Tempo and mode of speciation over time are also explored, exhibiting how the concept of species, if more refined, can reveal enormous amounts about the interplay between species origins and extinction and local and global climate change.