Download or read book Evolutionary Genetics of the Family Placobranchidae Mollusca Gastropoda Opisthobranchia Sacoglossa written by Anna Lee Bass and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Members of the family Placobranchidae have been the focus of numerous studies because of their interesting physiological adaptations (kleptochemistry and kleptoplasty) and ecological associations with marine algae. More than 100 species have been described since the 1800's, but no determination of phylogenetic relationships in the family has occurred. DNA sequences from two mitochondrial genes (large subunit ribosomal and cytochrome c oxidase subunit I) and one nuclear gene (Histone 3) were used to reconstruct relationships among 34 nominal species within the Placobranchidae. Strong support for terminal nodes was found using Bayesian phylogenetic methods; however, a "soft" polytomy was detected at internal nodes. In general, the results confirm the paraphyly of Elysia. Proposals for the designation of the genera, Thallepus Swainson, 1840 and Tridachia Deshayes, 1857 and delineation of species are presented. How intrinsic factors affect speciation rates in groups of animals has been a central focus in evolutionary biology. Adaptive radiation associated with food choice has been postulated for the opisthobranch order Sacoglossa. An increase in the rate of cladogenesis was detected within the family Placobranchidae and intrinsic factors such as larval development, kleptoplasty and food choice were investigated as potential key innovations. Ancestral state reconstruction of characters suggests that food choice played a dominant role in influencing speciation rate within the family Placobranchidae. Life history strategy may play an important role in structuring genetic variation throughout the geographic range of a species. Members of the sacoglossan family Placobranchidae Gray, 1840, exhibit variation in life history strategies such as feeding preference and degree of kleptoplasty that could be influential in population structuring. Three species, Elysia subornata Verrill, 1901, Elysia tuca Marcus and Marcus, 1967, and Elysia crispata Mörch, 1863 were sampled from several locations in an attempt to quantify genetic variation as indicated by cytochrome c oxidase subunit I gene sequencing. Elysia crispata exhibited the highest degree of population subdivision followed by Elysia tuca and Elysia subornata. Nucleotide and haplotype diversity also revealed the same general ranking of species. Preliminary conclusions suggest that diversity in feeding preference and degree of kleptoplasty play significant roles in population subdivision of these species.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nudibranch Sea Slug Identification written by Terrence Gosliner and published by New World Publidcations. This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2015 three leading scientific experts on nudibranchs and sea slugs collaborated to produce a comprehensive guide for divers and scientists to the Indo-Pacific region. After only three years, Nudibranch and Sea Slug Identification Indo-Pacific has sold out and become outdated due to the discovery of new species and numerous changes to the taxonomy of these organisms. On 1 November 2018, a new 2nd Edition will be realeased -- updated and reorganised, including 185 new species. Among other features, the new edition includes additional photographs of species, an identification key, and an up-to-date classification. The Indo-Pacific represents the largest expanse of tropical ocean in the world, stretching from the Indian Ocean coast of southern Africa and the Red Sea to the central Pacific of the Hawaiian Islands, Easter Island and the Marquesas. This region supports the most diverse marine fauna of any place in the world for most groups of marine organisms. The nudibranchs and sea slugs are no exception to this rule; there are about 3,000 described species of these organisms in the world and at least 40% of these have been found exclusively in the Indo-Pacific tropics. This book illustrates 2,138 Indo-Pacific nudibranchs and sea slugs, including many undescribed species.
Download or read book Evolutionary Patterns and Processes written by D. R. Lees and published by Academic Press. This book was released on 1993 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evolution is the central theme of all biology. Researcarcch in the many branches of evolutionary study continues to flourish. This book, based on a symposium of the Linnean Society, discusses the diversity in currentevolutionary research. It approaches the subject ambitiously and from several angles, bringing ttogether eminent authors from a variety of disciplines paleontologists traditionally with a macroevolutionary bias, neontologists concentrating on microevolutionary processes, and those studying the very essence ofsses and those studying the very essence of evolution the process of speciation in living organisms. Evolutionary Patterns and Processes will appeal to a broad spectrum of professional biologistsworking in such fields as paleontology, population biology, and evolutionary genetics. Biologists will enjoy chapters by Stephen J. Gould, discovering in the much earlier work of Hugo de Vries parallels with his ideas on punctuational evolution; Guy Bush,considering why there are so many small animals; Peter Sheldon, examining detailed fossil trilobite sequences for evidence of microevolutionary processes and considering models of speciation; as well as others dealing with cytological, ecological, and behavioral processes leading to the evolution of new species. None
Download or read book The Gastropoda written by Ferdinand Stoliczka and published by . This book was released on 1868 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Origin and Evolutionary Radiation of the Mollusca written by Malacological Society of London. Centenary Symposium and published by . This book was released on 1996 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mollusca are a large, diverse, and economically important group that ranges from slugs and snails through clams and oysters to octopus, squid, and cuttlefish. They are evolutionarily ancient and better known than most invertebrate groups because of their calcareous skeletons, which has led to their excellent preservation as fossils. This is a state-of-the-art summary of research into Molluscs and their evolution, including recent developments in phylogenetic analysis and molecular techniques. Since the last book on this topic was published in 1985, the vast amount of updated information found here should be on the bookshelf of every zoologist, evolutionary biologist, and taxonomist.
Download or read book MOLECULAR SYSTEMATICS written by Lydeard C and published by Smithsonian. This book was released on 2003-12-17 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leading scientists provide the most up-to-date information.This richly detailed book is the first complete review of molecular systematics and phylogeography of mollusks. Ten chapters cover a full range of issues such as research opportunities, molecules and evolution, bivalve evolution, gastropod evolution, and how mollusks have evolved into so many species. The concluding title in the Smithsonian Series of Comparative Evolutionary Biology, this book brings together experts from around the world. Each explores their topic in a way that reveals not only the evolutionary history of mollusks, but also how evolution operates. Anyone seriously interested in living mollusks, fossilized shells, or evolution will find this book to be an invaluable resource.
Download or read book Nudibranchs Encyclopedia written by Neville Coleman and published by Neville Coleman's Underwater Geographic. This book was released on 2008 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Opisthobranchia of Sagami Bay written by Hirotaro Hattori 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 Pelagic Snails written by Carol M. Lalli and published by Stanford University Press. This book was released on 1989 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lucid line drawings and photos, 16 in fine color. Based on some 15 years of study and collection in both polar regions and most areas of the tropics and temperate zones. Detailed treatment is given on all known pelagic snails (aoubt 140 species) including: external anatomy, swimming and buoyancy mec
Download or read book Fossil Record 2 written by Michael Benton and published by Springer. This book was released on 1993-11-30 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt: The history of life is illustrated by fossils which give crucial information on the plants and animals of the past. Fossil Record 2 is a compilation of this mass of data. All families of protists, plants and animals and their ranges in geological time are documented, with full details of first and last species for each family.
Download or read book Phylogeny and Evolution of the Mollusca written by Winston Ponder and published by Univ of California Press. This book was released on 2008-03-25 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Ponder and Lindberg provides a breathtaking overview of the evolutionary history of the Mollusca, effectively melding information from anatomy, ecology, genomics, and paleobiology to explore the depths of molluscan phylogeny. Its outstanding success is due to thoughtful planning, focused complementary contributions from 36 expert authors, and careful editing. This volume is a must for malacologists."—Bruce Runnegar, Department of Earth and Space Sciences, University of California, Los Angeles "Our understanding of the phylogeny and evolutionary history of the mollusca has been revolutionized over the past two decades through new molecular data and analysis, and reinvestigation of morphological characters. In this volume Ponder, Lindberg, and their colleagues do a wonderful job of integrating this work to provide new perspectives on the relationships of the major molluscan clades, their evolutionary dynamics, and their history. Particularly timely is the coverage of molluscan evo-devo and genomics."—Douglas H. Erwin, Curator of Paleozoic Invertebrates, National Museum of Natural History
Download or read book What s Left in Latin America written by Professor Henry Veltmeyer and published by Ashgate Publishing, Ltd.. This book was released on 2013-03-28 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book concerns recent and current political developments in Latin America related to the emergence of left-leaning regimes riding the waves of anti-neoliberalism and a primary commodities boom. Based on five years of field research and a critical engagement with social movements in the region, the book documents the short-term advances and strategic weaknesses of these left-leaning regimes, highlighting their failure to take advantage of favourable economic and political conditions. The authors profile four cases of recent and current political developments, and the prospects for socialism, in Argentina, Bolivia, Cuba and Venezuela.
Download or read book The Biology of Nematocysts written by Loma Linda University. Department of Physiology and Pharmacology and published by . This book was released on 1988 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: The biology of nematocysts ...
Download or read book Nudibranchs of Australasia written by R. C. Willan and published by . This book was released on 1984 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pseudothecosomata Gymnosomata and Heteropoda Gastropoda written by S. van der Spoel and published by Springer. This book was released on 1976 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Biology of Terrestrial Molluscs written by G. M. Barker and published by CABI. This book was released on 2001 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gastropods on land: phylogeny, diversity and adaptive morphology; Body wall: form and function; Sensory organs and the nervous system; Radular structure and function; Structure and function of the digestive system in Stylommatophora; Food and feeding behaviour; Haemolymph: blood cell morphology and function; Structure and functioning of the reproductive system; Regulation of growth and reproduction; Spermatogenesis and oogenesis; Population and conservation genetics; Life history strategies; Behavioural ecology: on doing the right thing, in the right place at the right time; Soil biology and ecotoxicology.
