Abstract: Surveys were carried out for chimpanzees, Pan troglodytes schweinfurthii, in the areas of Ntakata (300 km2 between the Mkamba River and the Lubalisi River, 05°45′ –06°15′ S, 30°00′ –30°15′ E), and Kakungu (200 km2 between the Lubalisi River and the sources of the Rubufu River, 05°55′ –06°15′ S, 30°00′ –30°15′ E), Tanzania, during the dry seasons of 2001 and 2003. The predominant veget...

Coevolution is one of the major processes organizing the earth's biodiversity, but it remains unclear when and how it may generate species diversity. The study by Parchman et al. () in this issue of Molecular Ecology provides the clearest evidence to date that divergent local adaptation in a coevolving interaction may lead to speciation on one side of an interaction but not necessarily on the o...

Topography describes the complex form of a surface--the undulations which make up its character. Topography comes in all shapes and forms; what is true for the surface of our planet is also true for the surfaces of engineered structures. If you have ever driven across the Flint Hills in south-eastern Kansas, you probably recognize that the only indicator you have that you are climbing a hill is...

The Polar Regions have long been recognized as important sinks for the aerosol, including mercury derived from natural and anthropogenic sources at lower latitudes. The volatile metals like Hg and Pb introduce to atmosphere mostly through burning of fossil fuel. Generally, the distribution of mercury in environmental media is related to pH, oxygen content, organic matter, reducing agents and mi...

People judged the inclination of hills viewed either out-of-doors or in a computer-simulated virtual environment. Angle judgments were obtained by having people (1) provide verbal estimates, (2) adjust a representation of the hill's cross-section, and (3) adjust a tilt board with their unseen hand. Geographical slant was greatly overestimated according to the first two measures, but not the thi...