Colonization 



Occupation of an area by a group of organisms, cf. 

 Invasion. 



Colony 



A group of individuals of one species, with a more or less 

 permanent location, e.g., a prairie dog "town." 



Columnar Structure 



The arrangement of soil particles in elongated, vertical, 

 blocky pieces with rounded tops. cf. Soil structure. 



Combination of Species, Characteristic 



See Characteristic combination of species. 



Commensal 



One of the organisms reacting in Commensalisrn (q. v.). 



Commensalism 



The living together of two or more organisms with benefit 

 usually to one and with injury to none. cf. Symbiosis, 

 Coaction. 



Commensurabiiity 



A measure of the extent to which ranches should share 

 in grazing privileges on nearby public land or cooperatively 

 controlled range, as determined by the forage resources of 

 the privately controlled property of the ranches involved. 



Community 



A group of one or more populations of plants and animals 

 in a common spatial arrangement; an ecological unit used 

 in a broad sense to include groups of various sizes and de- 

 grees of integration, cf. Association, Biocoenosis, Concrete 

 community, See Stand. An Abstract community or Commu- 

 nity-type is an assemblage of stands, e.g., the oak-hickory 

 community-type, cf. Association. A Microcommunity is a 

 community or stand occupying a small area such as an area 



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