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Hybrid zones--geographical areas in which the hybrids of two races are found--have attracted the attention of evolutionary biologists for many years, both because they are windows on the evolutionary process and because the patterns of animals and plant variation seen in hybrid zones do notfit the traditional classification schemes of taxonomists. Hybrid zones provide insights into the nature of the species, the way barriers to gene exchange function, the genetic basis of those barriers, the dynamics of the speciation process. Hybrid Zones and the Evolutionary Process synthesizes theextensive research literature in this field and points to new directions in research. It will be read with interest by evolutionary biologists, geneticists, and biogeographers.
This study draws on data from numerous sources that support the paradigm of natural hybridization as an important evolutionary process. The review of these data results in a challenge to the framework used by many evolutionary biologists, which sees the process of natural hybridization as maladaptive because it represents a violation of divergent evolution. In contrast, this book presents evidence of a significant role for natural hybridization in furthering adaptive evolution and evolutionary diversification in both plants and animals.
The Arthur M. Sackler Colloquia of the National Academy of Sciences address scientific topics of broad and current interest, cutting across the boundaries of traditional disciplines. Each year, four or five such colloquia are scheduled, typically two days in length and international in scope. Colloquia are organized by a member of the Academy, often with the assistance of an organizing committee, and feature presentations by leading scientists in the field and discussions with a hundred or more researchers with an interest in the topic. Colloquia presentations are recorded and posted on the National Academy of Sciences Sackler colloquia website and published on CD-ROM. These Colloquia are made possible by a generous gift from Mrs. Jill Sackler, in memory of her husband, Arthur M. Sackler.
A volume in the Handbook of Experimental Animals series, The Laboratory Primate details the past and present use of primates in biomedical research, and the husbandry, nutritional requirements, behaviour, and breeding of each of the commonly used species. Practical information on regulatory requirements, not available in other texts, is covered. Sections on experimental models cover the major areas of biomedical research, including AIDS, cancer, neurobiology and gene therapy. Assisted reproductive technology, tissue typing, and minimum group sizes for infectious disease/vaccine studies are also included. Two-color, user-friendly format, with copious illustrations and color plates Includes detailed, well-illustrated sections on gross & microscopic anatomy, common diseases, and special procedures, including surgical techniques
The outcome of speciation is put to the test in regions where incipient species' ranges overlap and hybrid offspring are produced, known as hybrid zones. Delineating the parental species that contributed each part of a hybrid genome, the ancestry, can provide insights into the history of hybrid individuals and the progression of speciation between these lineages. The genomic locations where regions of different ancestry meet are called junctions. Junctions are historical recombination events that occurred in hybrids, and thus are records of the history of the zone in which they are found. In this dissertation, I explore the effect of demography on junctions and then investigate junctions in a classic hybrid zone. I find that junctions are very responsive to demographic history, particularly the age of the hybrid zone, the population size, and the rate of migration within a stepping-stone model. I also find that population substructure uniquely impacts ancestry in a way that is not captured by single population models. I also introduce a novel metric to describe the sharing of junctions between individuals-the junction frequency spectrum. I then review my attempt to integrate the junction frequency spectrum and other metrics of ancestry into an inference method using approximate Bayesian computation. My approach is unable to accurately estimate parameters, but I outline suggestions that might allow this inference to be successful in the future. Finally, I identify hundreds of thousands of junctions in mice from two populations within the European house mouse hybrid zone between Mus musculus domesticus and M. m. musculus. I show that these junctions are variable between chromosomes and across the genome. I present the first estimates of the junction frequency spectrum in a hybrid population. The populations that I survey show unique patterns of ancestry and junction sharing, indicating that they have distinct histories. I use junctions along with the site frequency spectrum to infer the age of the hybrid zone as a few thousand years. Finally, I identify several regions of the genome that are outliers for ancestry metrics as candidate regions for incompatibilities between M. m. musculus and M. m. domesticus.
This visually appealing book recounts the history of molecular ecology and evolution as seen through the personal lens of one of its most prolific practitioners, who has studied a panorama of creatures ranging from corals, sponges, and other invertebrates to a wide variety of vertebrate animals including numerous birds, mammals, herps, and fishes. The sketches are of two types: evocative drawings of the animals themselves, and more than 230 written abstracts summarizing the author’s eclectic research on ecological-genetic topics spanning the microevolutionary to macroevolutionary. With the abstracts arranged by organismal group and placed in chronological order, the chapters in this book lead readers on a fascinating historical journey into the realm of molecular genetics as applied across the past four decades to intriguing questions in ecology, evolution, animal behavior, and natural history. Encapsulates salient genetic findings on a diverse array of creatures in nature Recounts the history of technological and conceptual developments in ecological genetics Includes approximately 80 beautiful line drawings of the animals themselves Provides context by preceding each abstract with an anecdote or historical backdrop Concludes each abstract with an addendum that further contextualizes the research findings Written by a world-leading authority in molecular ecology and evolution
The nature of populations, races, subspecies, and species. Genetic basis of isolation. Origin of isolation - theoretical. Origin of isolation - experimental. The nature of the speciation process.
The Principles of Biology sequence (BI 211, 212 and 213) introduces biology as a scientific discipline for students planning to major in biology and other science disciplines. Laboratories and classroom activities introduce techniques used to study biological processes and provide opportunities for students to develop their ability to conduct research.
The average person can name more bird species than they think, but do we really know what a bird “species” is? This open access book takes up several fascinating aspects of bird life to elucidate this basic concept in biology. From genetic and physiological basics to the phenomena of bird song and bird migration, it analyzes various interactions of birds – with their environment and other birds. Lastly, it shows imminent threats to birds in the Anthropocene, the era of global human impact. Although it seemed to be easy to define bird species, the advent of modern methods has challenged species definition and led to a multidisciplinary approach to classifying birds. One outstanding new toolbox comes with the more and more reasonably priced acquisition of whole-genome sequences that allow causative analyses of how bird species diversify. Speciation has reached a final stage when daughter species are reproductively isolated, but this stage is not easily detectable from the phenotype we observe. Culturally transmitted traits such as bird song seem to speed up speciation processes, while another behavioral trait, migration, helps birds to find food resources, and also coincides with higher chances of reaching new, inhabitable areas. In general, distribution is a major key to understanding speciation in birds. Examples of ecological speciation can be found in birds, and the constant interaction of birds with their biotic environment also contributes to evolutionary changes. In the Anthropocene, birds are confronted with rapid changes that are highly threatening for some species. Climate change forces birds to move their ranges, but may also disrupt well-established interactions between climate, vegetation, and food sources. This book brings together various disciplines involved in observing bird species come into existence, modify, and vanish. It is a rich resource for bird enthusiasts who want to understand various processes at the cutting edge of current research in more detail. At the same time it offers students the opportunity to see primarily unconnected, but booming big-data approaches such as genomics and biogeography meet in a topic of broad interest. Lastly, the book enables conservationists to better understand the uncertainties surrounding “species” as entities of protection.
Chagas disease causes severe socioeconomic impact and a high medical cost in Latin America. WHO and the World Bank consider Chagas disease as the fourth most transmittable disease to have a major impact on public health in Latin America: 120 million persons are potentially exposed, 16 to 18 million of whom are presently infected, causing 45,000 to 50,000 deaths per year. It has been calculated that approximately 2.4 million potential working years are lost because of incapacity and mortality due to the disease, for an annual cost estimated at 20 billion Euros. American Trypanosomiasis provides a comprehensive overview of Chagas disease and discusses the latest discoveries concerning the three elements that compose the transmission chain of the disease: The host: human and mammalian reservoirs The insect vectors: domestic and sylvatic vectors The causative parasite: Trypanosoma cruzi Informs and updates on all the latest developments in the field Contributions from leading authorities and industry experts