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

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 version offers 5,000 up to date entries on all elements of ecology and the environmental sciences. supplying direct entry to the main exact and updated details on hand, the dictionary covers an unlimited variety of matters, from plant and animal body structure, animal habit, evolution, environmental pollutants, and conservation to climatology, meteorology, geomorphology, and oceanography. The Dictionary of Ecology, moment variation, has been absolutely up to date to include advancements during this swiftly evolving box, relatively within the parts of molecular ecology, conservation, and the administration of habitats. additionally integrated are biographical notes on eminent ecologists and different scientists, in addition to valuable cross-references that make this quantity a useful reference device for college students, pros, and an individual with an curiosity within the flora and fauna and the environment.

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Phanerozoic, well-skeletonized marine invertebrates provide an illustration: their diversity at phylum level remains much the same throughout, whereas at family level there is a peak at the mid-*Palaeozoic and a trough at the Permo-*Triassic boundary; after this there is a steady increase to a second, higher peak in the *Cenozoic. diversity Most simply, the species richness of a *community or area, though it provides a more useful measure of community characteristics when it is combined with an assessment of the relative abundance of species present.

The diurnal range in equatorial areas exceeds the annual variation in average temperature. divergence 1. The genetic segregation and differentiation within a taxon to the extent that distinct derivative taxa result. The divergence may be at the *species, genus, family, order, or higher level. Thus it is possible to refer, for instance, to the divergence of gymnosperms and angiosperms from a stem group, to the divergence of angiosperm families, and to the divergence of a breeding population into two related species.

The process of removing the gravitational water from soil, using artificial or natural conditions, such that freely moving water can drain, under gravity, through or off soil. See MOLE DRAIN and TILE DRAIN. drainage basin See CATCHMENT. drainage basin morphometry The measurement of the characteristics of the surface form of a drainage basin (*catchment), and of the arrangement and organization of the associated river network Properties such as area, shape, gradient, and relief are important elements of form (see DRAINAGE BASIN SHAPE INDEX and DRAINAGE BASIN RELIEF RATIO), while the stream network is investigated through a study of its components and of the ways in which they are related.

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