Detritus
Dead organic matter.
In darker water, this is the source of energy for most invertebrates.
Autochthonous detritus
Is derived from primary production in situ.
Allochthonous detritus
Is imported for elsewhere including terrestrial environment.
CPOM
Coars Particulate Organic Matter >1mm.
FPOM
Fine Particular Organic Matter <1mm.
DOM
Dissolved Organic Matter <45mm.
DOC
Dissolved Organic Carbon
Osmoconformers
Organisms with body fluids that follow the changes in external osmotic conditions.
Only marine species.
Osmoregulators
Organisms that maintain a constant internal ionic concentration.
Hypo-osmotic
Marine fish are hypo-osmotic to seawater but have well developed osmoregulatory organs.