Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

The chromosome complement (karyotype) often differs between related mammalian species (including humans vs chimpanzees), such that evolutionary biologists muse whether chromosomal difference is a cause or a consequence of speciation. The common shrew is an excellent model to investigate this problem because of its many geographical races (potential species) differing chromosomally, and its several sibling species (recently speciated forms) that are also chromosomally different. This system is an exceptional opportunity to investigate the role of chromosomes in speciation and this volume reflects detailed research following these approaches. Highlights include the demonstration that chromosomal re-arrangements can be associated with complete loss of gene flow and thus speciation and that selection within species hybrid zones may lead to de-speciation rather than speciation. This book represents an extraordinarily detailed consideration of the role of chromosomes in speciation in one astonishing species, providing insights to those interested in mammalian diversity, chromosomal evolution and speciation.

Shrews --- Evolutionary genetics. --- Genetics. --- Speciation.

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Re-examining the 'species problem', whereby biologists cannot agree on how best to identify species and what constitutes useful and genuine biological divisions of groups and organisms, Jody Hey develops a theory of evolutionary groups.

Species. --- Speciation (Biology) --- Biology --- Genetics --- Hybridization --- Organisms

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This research topic highlights the most recent accomplishments of a Scientific Committee on Oceanic Research (SCOR) Working Group, SCOR WG 139: Organic Ligands - A Key Control on Trace Metal Biogeochemistry in the Ocean.

trace metals --- ocean chemistry --- organic ligands --- seawater --- chemical speciation

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Since the 1859 publication of On the Origin of Species, the concept of "species" in biology has been widely debated, with its precise definition far from settled. And yet, amazingly, there have been no books devoted to Charles Darwin's thinking on the term until now. David N. Stamos gives us a groundbreaking, historical reconstruction of Darwin's detailed, yet often misinterpreted, thoughts on this complex concept.Stamos provides a thorough and detailed analysis of Darwin's extensive writings, both published and unpublished, in order to reveal Darwin's actual species concept. Stamos argues that Darwin had a unique evolutionary species concept in mind, one that was not at all a product of his time. Challenging currently accepted views that believe Darwin was merely following the species ascriptions of his fellow naturalists, Stamos works to prove that this prevailing, nominalistic view should be overturned. This book also addresses three issues pertinent to the philosophy of science: the modern species problem, the nature of concept change in scientific revolutions, and the contextualist trend in professional history of science.

Species --- Speciation (Biology) --- Biology --- Genetics --- Hybridization --- Organisms --- Philosophy. --- Darwin, Charles, --- Darwin, Charles, Robert

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Although the species is one of the fundamental units of biological classification, there is remarkably little consensus among biologists about what defines a species, even within distinct sub-disciplines. The literature of paleobiology, in particular, is littered with qualifiers and cautions about applying the term to the fossil record or equating such species with those recognized among living organisms. In Species and Speciation in the Fossil Record, experts in the field examine how they conceive of species of fossil animals and consider the implications these different approaches have for thinking about species in the context of macroevolution. After outlining views of the Modern Synthesis of evolutionary disciplines and detailing the development within paleobiology of quantitative methods for documenting and analyzing variation within fossil assemblages, contributors explore the challenges of recognizing and defining species from fossil specimens-and offer potential solutions. Addressing both the tempo and mode of speciation over time, they show how with careful interpretation and a clear species concept, fossil species may be sufficiently robust for meaningful paleobiological analyses. Indeed, they demonstrate that the species concept, if more refined, could unearth a wealth of information about the interplay between species origins and extinctions, between local and global climate change, and greatly deepen our understanding of the evolution of life.

Evolutionary paleobiology. --- Fossils. --- Evolution (Biology) --- macroevolution. --- paleobiology. --- paleontology. --- speciation. --- species. --- tempo and mode. --- Evolutionary paleobiology --- Fossils