a tentative assumption or explanation that is tested in scientific investigations
Impact site
a site being studied to determine the effects of an activity or agent (M5)
Impoundment
sediments trapped behind human-made structures (C1)
Indigenous
native to an area but not unique to that area (IS1)
Insecticide
a substance toxic to insects used to control their populations (A4)
Insectivore
an animal that feeds primarily on insects (R3)
Instrumental value
worth or desirability that is ascribed to something because of what it can do for people or a person (R5)
Interisland dispersal
the spread of plant or animal species from one island to another (R3)
Intertidal zone
the area between the normal limits of high and low tides; the transition area between land and the ocean (M3)
Intrinsic value
worth or desirability that is ascribed to something simply because it exists; also known as ‘existence value’ (R5)