Actually plankton (not algae) should be far more abundant in the higher latitudes. The tropical latitudes are relatively barren, but as a consequence have the greatest water clarity. Take the humpback whale as an example. Female humpbacks travel to shallow, clear tropical waters to give birth but starve during their time there. In summer, they must travel back north to the higher latitudes to feed. The relative depth of the water tends not to be significant factor unless wave action or drainage of the land is involved.
But probably all irrelevant, as I don't believe we have the ability to set underwater conditions by region.
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-AKD
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