1+1
=2
2+1=
2
2+2=
3
3+2=
3
3+3=
4
Pond
Def
Shallow enough that light reaches the bottom throughout the pond.
(You will therefore potentially get root macrophytes throughout)
Lake
Def
Deep enough so that there is an aphotic zone without rooted plants (and other zones)
Osmoconformer
Body osmo = about the same as sea water and not found in estuaries or freshwater
Osmoregulators
Active regulation of bodies osmolarity. But there is a cost
Euryhaline
Able to osmoregulate across a wide range of conditions
Stenohaline
Unable to osmoregulate (typically narrow range of tolerance)
Adaptations for breeding success in FW envs from marine
X6
Lower fecundity Brood protection Larger egg size Abbreviated larval stage Higher tolerance to physio-chemical stress Little to no larval growth