In an aquatic ecosystem, what are the four factors that determine where organisms will live?

In an aquatic ecosystem the four determining factors are:

1. availability of Oxygen

2. Availability of Light

3. Availability of Nutrients and Nutrient sources

4. Temperature of the Water.

1. is tempeture, for example, some fish don't want to live in hot water.

2. water flow, for example there are fish who live in slow flowing water, and then you have the ones who live in fast flowing water, kinda like a stream.

3. water depth, for example, a shark wouldn't live in shallow water, they tend to live in deeper water

4. how much dissolved nutrients