Daftpanzer
canonically ambiguous
inevitable wikipedia link 
Im still confused about whether warmer water has fewer nutrients by nature, or whether its just the way ocean currents are arranged in the (real) world... (is it to with density and nutrients sinking below warmer water?)

wikipedia said:Plankton are found throughout the oceans, seas and lakes of Earth. However, the local abundance of plankton varies horizontally, vertically and seasonally. The primary source of this variability is the availability of light. All plankton ecosystems are driven by the input of solar energy (but see chemosynthesis), and this confines primary production to surface waters, and to geographical regions and seasons when light is abundant.
A secondary source of variability is that of nutrient availability. Although large areas of the tropical and sub-tropical oceans have abundant light, they experience relatively low primary production because of the poor availability of nutrients such as nitrate, phosphate and silicate. This is a product of large-scale ocean circulation and stratification of the water column. In such regions, primary production, still usually occurs at greater depth, although at a reduced level (because of reduced light).
Im still confused about whether warmer water has fewer nutrients by nature, or whether its just the way ocean currents are arranged in the (real) world... (is it to with density and nutrients sinking below warmer water?)