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Why does the open ocean have such a low NPP? 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. A special zone that only exists in certain places around the world is called the hadopelagic zone. More than 70% of the Earths surface is covered by ocean, and it is important to remember that more than 50% of the Earths surface is covered by ocean that is at least two miles (3.2 km) deep. APES NPP Flashcards | Quizlet Open Ocean - Oceana PDF Primary Productivity Worksheet - Mrs. Hall's Classes Furthermore, sinking organic matter isintercepted by the seabed, where it supports thriving benthic faunal communities, in the process being recycled back to dissolved nutrients that are then immediately available for primary production. ww2.unime.it/snchimambiente/PrPriFattMag.doc. Dissolved inorganic carbon, which is the feedstock for organic carbon production by photosynthesis, is also abundant and so is not typically listed among the nutrients. Why does the desert have such a low NPP even though they get a high amount of solar energy? By growing adequately rapidly to outstrip the grazing rates of zooplankton, the large phytoplankton can sometimes accumulate to high concentrations and produce abundant sinking material. Dead material can sink to the ocean depths in an open ocean. Mapping ecological and biogeochemical functions onto the genetic diversity of the phytoplankton is an active area in biological and chemical oceanography. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Can you still use Commanders Strike if the only attack available to forego is an attack against an ally? Is it safe to publish research papers in cooperation with Russian academics? The best answers are voted up and rise to the top, Not the answer you're looking for? In any case, if 80% photosynthesis occurs in oceans, that hardly seems low productivity - then why are oceans said to have low primary productivity (a host of reasons are also given for this - that light is not available at all depths in oceans, etc.)? Composite global ocean maps of concentrations of satellite-derived chlorophyll and ship-sampled nitrate (NO, Due to the impoverishment of low latitude surface waters in N and P, the productivity of the low latitude ocean is typically described as nutrient limited. The microzooplankton effectively graze these small cells, preventing their biomass from accumulating and sinking directly. What is the relationship between sea surface temperature and primary productivity? Instead of nearly neutrally buoyant single celled algae, larger, positively buoyant photosynthetic organisms (e.g., pelagic seaweeds) might dominate the open ocean. First, we have to know which are the most important criteria for photosynthesis to occur; these are: light, CO2, water, nutrients. In addition, the zooplankton export organic matter as fecal pellets.