1. Theory. - On the Evolution of Ecological Parameters. - Coevolution in Ecological Systems III. Coadaptation and Equilibrium Population Size. - 2. Physiology Biochemistry and Adaptation. - Physiology and Biochemistry of Enzyme Variation: The Interface of Ecology and Population Genetics. - Genes Enzymes and Hypoxia. - 3. Drosophila. - Speciation and Sexual Selection in Hawaiian Drosophila. - Ecology and Genetics of Sonoran Desert Drosophila. - Microspatial Genetic Differentiation in Natural Populations of Drosophila. - 4. Other Animals. - Ecological Parameters and Speciation in Field Crickets. - Some Contributions of Snails to the Development of Ecological Genetics. - 5. Plants. - Genetic Demography of Plant Populations. - Some Genetic Consequences of Being a Plant. - 6. Coda. - Population Differentiation: Something New or More of the Same?. Language: English