Salinity-- amount of dissolved salt
It's expressed in unites PPT (parts per thousand)
Average salinity is 35 ppt
Salinity varies due to evaporation and precipitation
Halocline is the rapid change in salinity.
Anadromous Fish- spend all or most of their adult lives in salt water and return to fresh water to spawn
Catadromous fish- live in fresh water and spawn in salt water
Temperature
-varies with lattitude and decreases with depth
-things dissolve better in cold water
Thermocline is the rapid change in temperature
Density is the amount of maeria or mass per unit of volume
Temperature and salinity determine the density.
Cold water is more dense
Warm water is less dense
An increase in salinity= increase in density
A decrease in salinity= decrease in density
Pycnocline is the rapid change in density
Pressure
on land= 1 atm
-water is heavier
-every 33ft, pressure increases 1atm
organisms must adapt for as pressure increases, gases are compressed
High pressure on scuba divers can lead to "the bends".
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