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 offers 5,000 updated entries on all elements of ecology and the environmental sciences. supplying direct entry to the main exact and updated info to be had, the dictionary covers an unlimited diversity of matters, 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 speedily evolving box, fairly within the components of molecular ecology, conservation, and the administration of habitats. additionally integrated are biographical notes on eminent ecologists and different scientists, in addition to invaluable cross-references that make this quantity a useful reference device for college kids, pros, and someone with an curiosity within the wildlife and our surroundings.
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Dewatering is usually undertaken to improve conditions in surface excavations and to help construction work at or near the surface. dew-point The temperature, with constant pressure and water-vapour content, to which air must be cooled for saturation to occur. Dew-point may be determined from the dew-point *hygrometer which indicates initial condensation on a cooled surface. dextrorse Growing or arising in a righthanded or clockwise spiral from the point of view of an observer. The term is applied to a climbing-plant stem, a chain of spores, etc.
Insects can enter the diapause state as eggs, larvae, pupae, or as adults. Diapause is frequently associated with seasonal environments, the insect entering it Â < previous page < previous page page_120 page_121 next page > next page > Page 121 during the adverse period, and breaking from it when more favourable conditions return. See also DORMANCY. diaphototropism A tropic response (see TROPISM) of a plant organ in which it grows at right angles to the stimulus of light. diaspore A *spore, *seed, or other structure that functions in dispersal: a *propagule.
They migrate inland and may be eroded locally by the wind to form a damp hollow or *'dune slack'. The enclosing crescentic dune is a 'parabolic' dune whose form reverses that of the barchan. See also AKLÃ DUNE; DUNE BED-FORM; and STAR DUNE. dune bedform ('megaripples') Mounds or ridges of sand which are asymmetrical and are produced subaqueously by flowing water. The external morphology is similar to the smaller 'ripple' and larger *'sand 46 47 wave', with a gently sloping, upstream side (stoss), and a steeper downstream side (lee).