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

By Michael Allaby

ISBN-10: 0192800787

ISBN-13: 9780192800787

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 presents 5,000 updated entries on all facets of ecology and the environmental sciences. providing direct entry to the main exact and updated details to be had, the dictionary covers an unlimited variety 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 totally up-to-date to include advancements during this quickly evolving box, really 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 precious cross-references that make this quantity a useful reference instrument for college kids, pros, and a person with an curiosity within the wildlife and our surroundings.

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Aleutian low A region of the North Pacific, near the Aleutian Islands, where the average value of atmospheric pressure is low, owing to the frequency of low-pressure systems (cyclones) moving into and occupying the region. Any one of these systems, when present on an individual day, may be called 'an Aleutian low'. Some of them are intense, others much less so. The term is the Pacific equivalent of *'Iceland low', used in the Atlantic. Alfisols (grey-brown podzolics) Mineral soils that are grouped as an order.

Dispersal mechanism The characteristic adaptation for dispersal which forms part of the reproductive strategy of many slow-moving or *sessile organisms. It is most characteristic of the dispersal of spores, seeds, and fruit from plants. but is also found in other organisms. especially for the dispersal of larvae. Typical examples are the hooked seeds and fruits that attach themselves to the coats of animals. dispersion 1. e. its distribution about the mean value). g. clumped or random). 2. In *pedology, the process of separating soil particles (as in *aggregates) from each other so that they may react as individual particles.

In subtropical, Mediterranean, and west-coast climates, the dry season is in the summer. dry valley A linear depression that lacks a permanent stream but shows signs of past water *erosion. g. the chalk of southern England). The dry valley was eroded during an episode of surface drainage, perhaps due to *permafrost conditions. to greater precipitation, or to a higher *water-table. dry-weather flow See BASEFLOW. dulosis (adj. dulotic) The slave-making behaviour of certain parasitic ant species, in which the workers raid nests of other species and remove pupae.

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


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