Bøger af Jerry A. Powell

Forest defoliators of the Spruce Budworm complex are the most extensively studied moths in the world, yet taxonomic relationships among western populations have been poorly understood. This work distinguishes species groups using a three-dimensional definition-reproductive isolation through intraspecific recognition (pheromone chemistry and correlated behavior), ecological separation (larval hosts), and morphometric analysis of adults--where traditional study of museum specimens failed.

Insects boast incredible diversity, and this book treats an important component of the western insect biota that has not been summarized before-moths and their plant relationships. There are about 8,000 named species of moths in our region, and although most are unnoticed by the public, many attract attention when their larvae create economic damage: eating holes in woolens, infesting stored foods, boring into apples, damaging crops and garden plants, or defoliating forests. In contrast to previous North American moth books, this volume discusses and illustrates about 25% of the species in every family, including the tiny species, making this the most comprehensive volume in its field. With this approach it provides access to microlepidoptera study for biologists as well as amateur collectors. About 2,500 species are described and illustrated, including virtually all moths of economic importance, summarizing their morphology, taxonomy, adult behavior, larval biology, and life cycles.

California has a vast number of insect species: estimates run 30,000-35,000 or more, and even in the better known groups, new species occasionally are discovered. This book summarizes knowledge of this rich insect fauna. It selects about 600 of the more characteristic kinds of insects to represent the huge variety known.