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4.1.1 Demographic significance Confined populations grow more rapidly than populations from which dispersal is permitted (Lidicker, 1975; Krebs, 1979; Tamarin et at., 1984), and demography in island populations where dispersal is restricted differs greatly from nearby mainland populations (Lidicker, 1973; Tamarin, 1977, 1978; Gliwicz, 1980), clearly demonstrating the demographic signi ficance of dispersal. The prevalence of dispersal in rapidly expanding populations is held to be the best evidence for presaturation dispersal. Because dispersal reduces the growth rate of source populations, it is generally believed that emigration is not balanced by immigration, and that mortality of emigrants occurs as a result of movement into a 'sink' of unfavourable habitat. If such dispersal is age- or sex-biased, the demo graphy of the population is markedly affected, as a consequence of differ ences in mortality in the dispersive sex or age class. Habitat heterogeneity consequently underlies this interpretation of dispersal and its demographic consequences, although the spatial variability of environments is rarely assessed in dispersal studies.
Provides an overview of the fast expanding field of dispersal ecology. The causes, mechanisms, and consequences of dispersal at the individual, population, species, and community levels are all considered.
Dispersal has become central to many questions in theoretical and applied ecology in recent years. In this volume a team of leading ecologists aim to provide the advanced student and researcher with a comprehensive review of dispersal and its implications for modern ecology.
Dispersion strengthened nickel produced from ultrafine comminuted powders.
Over the last decade, the biggest advances in physical chemistry have come from thinking smaller. The leading edge in research pushes closer to the atomic frontier with every passing year. Collecting the latest developments in the science and engineering of finely dispersed particles and related systems, Finely Dispersed Particles: Micro-, Nano-, a
Batteries 2: Research and Development in Non-Mechanical Electrical Power Sources provides information pertinent to the selection and operation of power source. This book focuses on the progress and further development in battery design. Organized into 38 chapters, this book begins with an overview of the metallurgical properties of a positive grid alloy as well as the properties of dispersion-strengthened lead. This text then explains the voltage maximum as being resistance polarization. Other chapters consider the standard heat of activation for the rate-determining step at the reversible potential and explain the difficulties of predicting the orbital performance of solar cells from terrestrial measurements. This book discusses as well the chemical changes occurring during the manufacture and life of lead–acid batteries. The final chapter deals with the mechanism of the processes that occur in fuel cells. This book is a valuable resource for chemical, electrical, telecommunications, electrochemical, and automotive engineers.