Because of the density difference between surface water and the deep sea across most of the ocean, ocean circulation can only very slowly reintroduce dissolved nutrients to the euphotic zone. By driving nutrients out of the sunlit, buoyant surface waters, ocean productivity effectively limits itself.
Which ecosystem is least productive?
-Oceans contain lots of nutrients but they have no sufficient sunlight reaching in the deep areas, therefore, oceans have the least productivity among all ecosystems.
Does the open ocean have low levels of nutrients?
The open ocean has very low levels of nutrients. … Most of the photosynthetic activity on Earth occurs in the open ocean within the photic zone.
Why are earth’s ecosystems least productive and why?
Some of the least productive ecosystems are: POLAR REGIONS: Polar regions and deserts are the least productive because both types of ecosystems experience little photosynthesis year-round. TUNDRAS: Not only are tundras cold in temperature, but they receive little for rainfall.
Which is the most productive ecosystem?
Tropical rainforests show the highest productivity in terrestrial ecosystems.
Which of the following is least productive ecosystem desert?
Very low productivity is present in deserts and arctic regions. In oceans and other aquatic ecosystems, productivity is limited by light as it decreases with depth. But on a global basis, aquatic ecosystems occupy more space on earth than any other biome and have good productivity in surface layers, which are euphotic.
Why do you think the open ocean is not a productive ecosystem quizlet?
The open ocean is not a productive ecosystem because most of the ocean does not receive sunlight. The productive places in the ocean are the places where plankton can carry out photosynthesis (near the surface) or the bottom, where benthic organisms can feed off the detritus.
Why are cold oceans more productive?
Why is cold water more productive? Cold water can hold more dissolved oxygen than warm water. The levels of dissolved oxygen in Antarctic waters are so high that many fish have few or no red blood cells (the blood cells other animals, including humans, use to carry oxygen).
Why is the marine environment productive?
Most marine primary production is generated by a diverse collection of marine microorganisms called algae and cyanobacteria. Together these form the principal primary producers at the base of the ocean food chain and produce half of the world’s oxygen.
How does the ocean contribute to the productivity of the biosphere?
Ocean biogeochemistry (i.e. the cycling of elements like carbon and nitrogen) is driven by activity in the ocean surface where sufficient light exists to stimulate photosynthesis. This process converts CO2 and other nutrients into living biomass, on which all subsequent ocean productivity depends.
In marine waters the most productive systems are brown algal beds, seagrass beds and coral reefs. The kelps, brown algae of the genera Laminaria and Macrocystis, form dense forests in the sublittoral zone of rocky coasts in cool waters.
What is the most productive ecosystem in the ocean?
Coral reefs are among the most productive ecosystems on the planet, with the primary producers at the base of the food chain (including corals) supporting their complex food webs.
Which one of the following are most productive ecosystem except?
Solution: Answer: DSolution: Tropical rainforest shows the maximum diversity and also the maximum productivity.
Why is productivity important to an ecosystem?
Ecosystems have characteristic amounts of biomass at each trophic level. … The productivity of the primary producers is especially important in any ecosystem because these organisms bring energy to other living organisms by photoautotrophy or chemoautotrophy.