from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The successful establishment of a plant or animal species in a habitat.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The process of successful establishment of a plant or animal species in a habitat that was barren previously/ or was left barren due to some catastrophe.
from The Century Dictionary and Cyclopedia
- n. The fixation of a migrating plant in a new habitat.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (ecology) the process by which a plant or animal becomes established in a new habitat
Invasion is the complete or complex process of which migration, ecesis
They restrict or prevent ecesis either by the destruction of invaders or by placing them at a disadvantage with respect to the occupants.
Invasion into a new area or a plant community begins with migration when this is followed by ecesis.
In new areas, ecesis produces reaction (the effect which a plant or a community exerts upon its habitat) at once, and this is followed by aggregation and competition, with increasing reaction.
In the first place, an association acts as a barrier to the ecesis of species invading it from associations of another type, on account of the physical differences of the habitats.
How far can the terms migration, ecesis, and competition, as used by
Man and animals operate as marked barriers to ecesis wherever they alter conditions unfavorably to invaders or where they turn the scale in competition by cultivating, grazing, camping, parasitism, etc.
They may affect invasion either by limiting migration or by preventing ecesis.
In an area already occupied by plants, ecesis and competition are concomitant and quickly produce reactions.
The significant feature of continuous invasion is that an outpost may be repeatedly reinforced, permitting rapid aggregation and ecesis, and the production of new centers from which the species may be extended over a wide area.
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