Table of Contents

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?.