Geographic Variation, Speciation and Clines. (MPB-10), Volume 10

Geographic Variation, Speciation and Clines. (MPB-10), Volume 10
Author: John A. Endler
Publisher: Princeton University Press
Total Pages: 262
Release: 2020-03-31
Genre: Science
ISBN: 0691209456

Geographic Variation, Speciation and Clines explores the origins and development of geographic variation, divergence, and speciation. In particular it is concerned with genetic divergence as it is usually found on continents, among groups of populations isolated only by distance. Although earlier writers on this topic considered the effects of geography and dispersal, intense geographic differentiation and speciation were thought to require complete isolation. Professor Endler shows how geographic differentiation and speciation may develop in spite of continuous gene flow. Following a review of the diverse and scattered literature on gene flow and population differentiation, the author discusses the relationships among gene flow, dispersal, and migration. He then summarizes the factors which limit the geographic extent of gene flow, and those which allow steep clines to develop in the absence of barriers to gene flow. His analysis draws on examples from the field, experiments, and single- and multiple-locus models. The mechanism and conditions for parapatric speciation are presented: steepening clines, development into hybrid zones, and the evolution of sexual isolation. In the final chapter the author considers the interpretation of natural clines and the associated geographic patterns of subspecies and species.

Avian Biology

Avian Biology
Author: Donald S. Farner
Publisher: Elsevier
Total Pages: 607
Release: 2013-09-25
Genre: Science
ISBN: 1483270009

Avian Biology is a collection of papers that deals with biological aspects of birds such as their classification and habitat behavior. One paper reviews how birds are classified through practical systematics, study of fossils, and some of the problems encountered in the arrangement of major groups. Another paper discusses the origin and evolution of birds from their reptilian predecessors to their current evolutionary rates. Evolutionary rates vary depending on access to new habitats; if the environment is static, evolutionary rates can also slow down. One author discusses the inter-relations of sea birds with their marine environment, including coastal areas and the biological properties of the surface water. Another author describes the biology of desert birds relating to nomadism behavior and physical adaptations especially to the arid environment. The author also describes the cooling mechanism of these desert birds. Another paper evaluates the ecological aspect of behavior that includes foraging, habitat selection, mating, and flocking cohesion. Avian biologists, zoologists, and readers who have a general interest in birds will find this book useful.

Genetics of the Evolutionary Process

Genetics of the Evolutionary Process
Author: Theodosius Dobzhansky
Publisher: Columbia University Press
Total Pages: 524
Release: 1970
Genre: Computers
ISBN: 9780231083065

The world's foremost geneticist surveys the major developments in what is emerging as the most important single area of scientific inquiry in the twentieth century: biological theory of evolution.

Commencement Programs

Commencement Programs
Author: University of California, Berkeley
Publisher:
Total Pages: 1032
Release: 1962
Genre: Commencement ceremonies
ISBN:

Avian Biology

Avian Biology
Author: Donald Sankey Farner
Publisher:
Total Pages: 620
Release: 1971
Genre: Animal ecology
ISBN: