Exchange of Phosphorus Across the Sediment-Water Interface In this article, principles of phosphorus retention and phosphorus release at the sediment-water interface in lakes are reviewed. New results and hypotheses are discussed in relation to older models of phosphorus exchange between sediments and water. The fractional composition of sedimentary phosphorus is discussed as a tool for…
Read more
The Distribution of Abundance. I. Measurements We investigated the spatial distributions of densities within the geographical ranges of species of carabid beetles, birds and plants. Unselected data of hundreds of species from censures in sampling areas of varying size and location in northwestern Europe were analysed. The geographical distribution of species abundance is as a…
Read more
Determination of heavy metal concentrations in street dusts in Istanbul E-5 highway Components and quantity of street dust are environmental pollution indicators especially in big cities. Street dust is generally composed of car exhaust gas originated particles and wind-transported particles. Heavy metals, which are found in street dust, such as Pb, Cu, Mn, Zn, Cd…
Read more
Understanding ecosystem retrogression Over time scales of thousands to millions of years, and in the absence of rejuvenating disturbances that initiate primary or early secondary succession, ecosystem properties such as net primary productivity, decomposition, and rates of nutrient cycling undergo substantial declines termed ecosystem retrogression. Retrogression results from the depletion or reduction in the availability…
Read more
The Multiple Forms of the Interspecific Abundance-Distribution Relationship Within a taxonomic assemblage, locally abundant species tend to be widespread and locally rare species tend to be restricted in their distribution. Although frequently treated en masse, the data sets on which studies of interspecific abundance-distribution relationships have been based differ enormously in the scales and forms…
Read more
The Essence of Wildlife Management Effectiveness of wildlife professionals in the twenty-first century will depend on their skill at integrating biological and human dimensions of wildlife management. This will need to be done well because stakeholder interests in wildlife and their expectations for participation in wildlife management are changing. As practitioners adapt to these changes,…
Read more
On the Relationship between Abundance and Distribution of Species There appears to be a general relationship between abundance and distribution that has two parts. First, within species, population density tends to be greatest in the center of the range and to decline gradually toward the boundaries. This pattern holds over a range of spatial scales…
Read more
Natural Disaster and Technological Catastrophe Against the backdrop of ever-expanding technological systems, the effects of accidents or breakdowns in human-made technology are examined and contrasted with those of natural disasters. A number of differences are identified, and research on these forms of cataclysmic events is reviewed. These data, as well as this analysis, suggest that…
Read more
Butterfly Metapopulations This chapter presents a study on butterfly metapopulations. Butterfly populations are often structured in space in a manner that is broadly consistent with the metapopulation concept. The ecology of butterflies is well known in most countries in Europe and elsewhere. The chapter describes the general features of spatial population structure in butterflies, and…
Read more
Geochemical processes. Water and sediment environments. The book begins with a chapter introducing the broad picture of the worldwide geochemical cycles, and proceeds to treat in additional detail the individual processes liable for the main fluxes of materials ashore , in waters, and, to a lesser degree, within the atmosphere. the next chapters affect the…
Read more