The green filter
The strength and wavelength of the light also effect which algae will be present and therefore red algae usually increase in numbers with depth. They can even grow when there is only a weak light source. Cliffs at depth are rarely bare, where algae cannot grow, the surface is usually covered with attached creatures.
In Swedish waters, salinity usually increases and is more stable at depth. This is probably one of the reasons why certain specie that are common in shallow waters along other coasts are common deeper down in Swedish waters.
|Cliffs and rocks are fantastic!|
|Zoning and flecked occurrence|
|Animals that are attached|
|Variation and change|
|Variations in water level|
|Both cliffs and rocks|
|Freshwater and saltwater|
|Geography, climate and history|
|Organisms life cycles|
|Organisms effect on each other|
|Energy and the flow of material|