Download A Dictionary of Ecology (Oxford Paperback Reference) by Michael Allaby PDF

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By Michael Allaby

From acid rain, CFC's, and the greenhouse influence to the food-chain and the gene financial institution, Oxford's completely revised Dictionary of Ecology, moment variation presents 5,000 updated entries on all points of ecology and the environmental sciences. providing direct entry to the main actual and up to date details to be had, the dictionary covers an enormous diversity of topics, from plant and animal body structure, animal habit, evolution, environmental toxins, and conservation to climatology, meteorology, geomorphology, and oceanography. The Dictionary of Ecology, moment variation, has been totally up to date to include advancements during this swiftly evolving box, really within the components of molecular ecology, conservation, and the administration of habitats. additionally incorporated are biographical notes on eminent ecologists and different scientists, in addition to worthwhile cross-references that make this quantity a useful reference software for college kids, execs, and an individual with an curiosity within the wildlife and our surroundings.

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See DRAINAGE NETWORK ANALYSIS. drainage basin relief ratio An index (Rh) of the relief characteristics of a drainage basin. It is expressed as Rh = H/L, where H is the difference in height between the highest and lowest points in the basin and L is the horizontal distance along the longest dimension of the basin parallel to the main stream line. The ratio can be positively correlated with the rate of sediment loss from a basin. drainage basin shape Index A measure of the shape of a drainage basin (*catchment), normally expressed as the ratio between two dimensions of the basin being considered.

Mathematical modelling using these factors has practical applications in the design of nature reserves, and provides an insight into the present distribution of organisms. g. oceans in the case of terrestrial organisms, or a cereal *monoculture in the case of woodland organisms. 35 36 dispersal biogeography The term now applied to the traditional school of *biogeography, regarding organisms as arising in a *centre of origin and spreading out, utilizing *corridor dispersal *sweepstake routes, etc.

A molecule with an uneven charge distribution, one pole having a net negative charge, the other a net positive charge). dipole field The field that results from the presence of two oppositely polarized magnetic poles. The term is usually applied to the geomagnetic dipole field or that associated with a magnetic anomaly. dipole moment See POLAR MOLECULE. e. the inclination is 90º). A positive (downward) inclination is a positive (north) dip pole, and a negative (upward) inclination is a negative (south) dip pole.

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