Question: Which statement best compares coastal ecosystems to open ocean ecosystems? Need Assignment Help? Coastal ecosystems include abyssopelagic depths, and open ocean ecosystems do not. Coastal ecosystems have less sunlight, fewer nutrients, and less diversity than open ocean ecosystems. Coastal ecosystems have a greater range of water pressures than open ocean ecosystems. Coastal ecosystems have more sunlight, more nutrient, higher levels of productivity than open ocean ecosystems.