By Michael Allaby
From acid rain, CFC's, and the greenhouse impression to the food-chain and the gene financial institution, Oxford's completely revised Dictionary of Ecology, moment version offers 5,000 updated entries on all elements of ecology and the environmental sciences. providing direct entry to the main exact and updated info to be had, the dictionary covers an enormous diversity of topics, from plant and animal body structure, animal habit, evolution, environmental pollutants, and conservation to climatology, meteorology, geomorphology, and oceanography. The Dictionary of Ecology, moment version, has been absolutely up-to-date to include advancements during this speedily evolving box, quite 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 beneficial cross-references that make this quantity a useful reference software for college students, pros, and an individual with an curiosity within the wildlife and the environment.
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Extra info for A Dictionary of Ecology (Oxford Paperback Reference)
See POLYMORPHISM. Dinantian See CARBONIFEROUS. dinoflagellates An order (Dinoflagellida) of protozoans that are *heterotrophs but closely allied to brown *algae and diatoms (they are sometimes classified as algae). Many have brown or yellow chromoplasts containing xanthophyll and chlorophylls a and c; others are colourless. Typically, dinoflagellates have two flagella, one propelling water to the rear and providing forward motion, attached just behind the centre of the body and directed posteriorly, the other causing the body to rotate and move forwards, forming a transverse ring or spiral of several turns around the centre of the body.
49 50 ecological and phytosociological distance See AFFINITY INDEX. g. dam construction) which may outweigh the gains anticipated from the modification scheme. ecological barrier See DISPERSAL BARRIER. ecological efficiency The ratio between energy flows measured at different points in a food-chain, usually expressed as a percentage. g. intake, *assimilation, and *production). Two main categories of efficiencies are studied: (a) those of energy transfer between different *trophic levels; and (b) those of energy transfer within a single trophic level.
E. unsaturated) air cools when rising adiabatically through the atmosphere as a result of the utilization of energy in expansion. 8ÂºC/km. See also INSTABILITY; SATURATED ADIABATIC LAPSE RATE; and STABILITY. Dryas Part of the characteristic threefold late-glacial sequence of climatic change and associated deposits following the last (*Devensian) ice advance and prior to the onset of the markedly warmer conditions of the current (*Flandrian) *interglacial. g. tree birches. The colder Dryas phases mark times of cold.
A Dictionary of Ecology (Oxford Paperback Reference) by Michael Allaby