dispersal


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dis·per·sion

(dis-pĕr'zhŭn),
1. The act of dispersing or of being dispersed. Synonym(s): dispersal
2. Incorporation of the particles of one substance into the mass of another, including solutions, suspensions, and colloidal dispersions (solutions).
3. Specifically, what is usually called a colloidal solution.
4. The extent or degree in which values of a statistical frequency distribution are scattered about a mean or median value.
[L. dispersio]

dispersal

the act of disseminating or scattering the seeds of plants, or the larvae of animals (particularly important in sessile animals), or any movement of adults. Animal larvae may be mobile, but the dispersal of spores, seeds and fruits is brought about by wind, water and animals, and in some plants explosive mechanisms are present.

Many mechanisms exist to aid dispersal: some fruits, e.g. teasel, burdock, are hooked, becoming attached to the bodies of animals; some parasites use vectors (e.g. a mosquito in the case of the malarial parasite), to carry parasitic organisms between hosts; and some larvae of marine animals move to different layers of water where current direction may be different from the level at which the adults live. Dispersal techniques include EMIGRATION, IMMIGRATION and MIGRATION.

References in periodicals archive ?
Vein and its tributaries presented Dispersal pattern in 60% and Magistral pattern in 40%.
In several cases dispersal separated women from the father of their baby.
In order to evaluate mosquito dispersal during egg-laying we seek opportunities in the limits between ex tended urbanized and non-urbanized ("wild") areas.
We defined dispersal as the permanent departure from the natal home range to an independent home range for the purposes of reproduction.
For the rest of this paper we will refer to the fruit as "seed," since "seed" is the term generally used when referring to diaspores in studies exploring dispersal and recruitment dynamics of tropical tree species (Vander Wall et al.
For their part, Kumar and Eystergaard plan to further investigate the molecular mechanisms underlying temperature-induced changes in seed dispersal.
Aerial Dispersal of Pollen and Spores covers dozens of topics within the study of pollen and spore dispersal, such as the physical properties, forces, and processes affecting pollen and spores--in motion and at rest; pollen and spore survival; infection and fertilization efficiency; wind and wind transport models; cross fertilization; pollen mediated gene flow; precision agriculture practices applied to aerially dispersed pathogens; infectious periods and opportunity for disease spread; aerial sampling, and more.
This may be the only case of tumbleweed dispersal in Salvia; its close relatives (S.
Larval dispersal has not been well studied in relation to abalone species.
Sumalbag was the jeepney driver who was mercilessly brutalized by policemen just as he was fleeing the violent dispersal.
Nuneaton Safer Neighbourhood Team (SNT) officer, PC Gavin Parrott successfully applied for a dispersal zone to cover the area.