The surface layers are warmer and have more light. By this definition, all of the deepest parts of the ocean conclude in the hadopelagic. Second, chlorophyll concentration speaks more directly to the rate of photosynthesis (i.e., GPP) than to NPP, the latter representing the growth of phytoplankton biomass plus the transfer of organic matter-bound energy to higher trophic levels. 3. Open ocean heterotrophs include bacteria as well as more . First, the relationship between chlorophyll and biomass is changeable, depending on the physiology of phytoplankton; for example, phytoplankton adapted to lower light and/or higher nutrients (e.g., iron) tend to have a higher cellular concentration of chlorophyll (Geider et al. How many statements are correct net primary productivity? The cross-over from sunlit and nutrient-poor to dark and nutrient-rich typically occurs at roughly 80 m depth and is demarcated by the "deep chlorophyll maximum" (DCM; Figure 2) (Cullen 1982), a depth zone of elevated chlorophyll concentration due to higher, Seasonality in productivity is greatest at high latitudes, driven by the availability of light (Figure 4a and b). Corals can survive a bleaching event, but they are under more stress and are subject to mortality. The best answers are voted up and rise to the top, Not the answer you're looking for? PDF The Process of Primary Production - University of Michigan What is the relationship between sea surface temperature and primary productivity? 10. Typical conditions in the subtropical ocean, as indicated by data collected at the Bermuda Atlantic Time-series Station in July, 2008. While the new nutrient supply and export production are ultimately linked by mass balance, there may be imbalances on small scales of space and time, allowing for brief accumulations of biomass. Marine Net Primary Production | SpringerLink This is achieved by the sinking of organic matter out of the surface ocean and into the ocean interior before it is returned to dissolved inorganic carbon and dissolved nutrients by bacterial decomposition. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. We have already protected nearly 4 million square miles of ocean and innumerable sea life -but there is still more to be done. Thus, most open ocean biomass, including phytoplankton, zooplankton, and nekton, is found within ~200 m of the ocean surface. Why Are Gross Primary Production And Net Production Not The - IosFuzhu (PREVIOUS AP MC QUESTION): Open ocean produce the largest share of Earth's biomass because the net primary productivity (NPP) of the oceans is high and thus can support a high proportion of producers high as a result of the high concentration of nutrients in the open oceans