Cichlid Room Companion

TERME: Description du gloassaire des termes.


Contexte: Géographie

gradient

A change of elevation in the channel of a stream measured in feet per mile/meters per kilometer, or a change in salinity

Référence

Miller, Robert Rush. 2005. "Freshwater Fishes of Mexico". University of Chicago Press, Chicago. pp. 1-524 (crc01245)

Wikipedia