They have to travel over large regions of the ocean in search of this type of prey and to reach the areas where they live. (pearltrees.com)
Both processes occur in regions of the ocean that are naturally low in oxygen, or anoxic, due to local lack of water circulation and intense phytoplankton productivity overlying these regions. (sciencedaily.com)
Scientists have realized for decades that «fertilizing» desolate regions of the ocean with iron or other nutrients could spawn large blooms of carbon - hungry phytoplankton. (seedmagazine.com)