IDENTIFICATION 



I- / 



The use of a taxonomic key or the equivalent 



to determine the scientific name of an organism. 



INCIDENTAL DRIFT 



The casual, random drift of organisms. 

 (See Drift Organisms , Catastrophic Drift , 

 Periodic Drift) 



INCIPIENT LETHAL 

 LEVEL (ILL) 



That concentration of an environmental identity 

 beyond which an organism could no longer 

 survive for an indefinite period of time. 



INDICATOR ORGANISMS 



A species , whose presence or absence may be 

 characteristic of environmental conditions in 

 a particular area or habitat ; however, species 

 composition and relative abundance of individual 

 components of the population or community are 

 usually considered to be a more realiable 

 index of water quality. 



INDIGENOUS 



Refers to an organism that is native, not 

 introduced in an area. 



INDIRECT TOXICITY 



INLET 



Toxicity that affects organisms by interfering 

 with their food supply or modifying their 

 habitat instead of directly acting on the 

 organisms themselves. (See Direct Toxicity ) 



A short, narrow waterway connecting a bay, 

 lagoon , or similar body of water with a large 

 parent body of water; an arm of the sea, or 

 other body of water, that is long compared to 

 its width, and that may extend a considerable 

 distance inland. 



