posted by kendra` .
Increasing depths in the ocean causes a what in sunligh. Increasing depths in the ocean causes a what in pressure. Producer in the upper three zones of the ocean use what while producer in the lower ocean zones use what to generate nutrients to support the ecosystem
With increase in depth, sunlight decreases and pressure increases. Not sure what you are seeking for the last part.
Since this is not my area of expertise, I searched Google under the key words "ocean zones producers" to get these possible sources:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.