Interspersion 



The irregular occurrence of plant communities and 

 species which provide cover for animals within a limited 

 area. cf. Mosaic. 



Intertidal Zone 



See Tidal zone. 



Intracellular 



Refers to the location or position of a substance or 

 structure within a cell. 



Intraclinal 



Refers to the presence of organisms such as Ecotypes 

 (q. v.) within a Cline (q. v.). 



Intradiel 



Refers to the period of a single 24-hour day. 



Intraneous 



The presence of individuals of a species toward the center 

 of its entire area of distribution, cf. Extraneous. 



Intraspecific 



Refers to relations or conditions between individuals 

 within a species, cf. Interspecific. 



Intrazonal Soil 



A group of soils having characteristics caused by the 

 preponderant influence of local relief or parent material over 

 the normal influences of the prevailing climate and vegeta- 

 tion, cf. Zonal soil. 



Intrinsic Cycle 



See Cycle. 



Introgression 



See Introgressive hybridization. 



Introgressive Hybridization 



The infiltration of genes of one species by the inter- 



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