Question: Which Ecosystems Have The Highest Productivity?

What increases net primary productivity?

Net primary productivity varies among ecosystems and depends on many factors.

These include solar energy input, temperature and moisture levels, carbon dioxide levels, nutrient availability, and community interactions (e.g., grazing by herbivores) 2..

How does temperature affect primary productivity?

The effect of temperature change is generally positive to increase the productivity by enhancing the photosynthesis as long as the temperature is in a range of optimum level. When temperature exceeds the optimum level, it will increase the rate of respiration causing the NPP continuously declined.

How do humans affect net primary productivity?

Human activities such as land use affect the magnitude of global NPP and the flow of biomass through ecosystems, among others through changes in land cover. … Of this amount, 53% came from harvests, 40% from land-use-induced productivity changes, and 7% from human-induced fires.

Why is primary productivity important?

Primary productivity is the conversion of the sun’s energy into organic material through photosynthesis. … Primary productivity is important because it is the process that forms the foundation of food webs in most ecosystems.

How is primary productivity calculated?

Primary productivity is usually determined by measuring the uptake of carbon dioxide or the output of oxygen. Production rates are usually expressed as grams of organic carbon per unit area per unit time.

What is the percentage of primary productivity of oceans?

Approximately half of all global net annual photosynthesis occurs in the oceans, with ~10-15% of production occurring on the continental shelves alone (Müller-Karger et al. 2005).

Which of these ecosystems has the highest net primary productivity?

How is it that the open ocean produces the highest net primary productivity of Earth’s ecosystems, yet net primary productivity per square meter is relatively low? A) Oceans contain greater concentrations of nutrients compared to other ecosystems. B) Oceans receive a lesser amount of solar energy per unit area.

What 3 ecosystems have the lowest productivity?

The highest net primary productivity in terrestrial environments occurs in swamps and marshes and tropical rainforests; the lowest occurs in deserts.

What are the two most productive land ecosystems?

The two most productive are estuaries, swamps and marshes, and tropical rain forests. The two least productive are open ocean, tundra, and desert. About what percentage of total potential net primary productivity of the entire earth and the earth’s terrestrial ecosystems are used, wasted, or destroyed by humans?

How does energy flow through an ecosystem?

Energy flows through an ecosystem in only one direction. Energy is passed from organisms at one trophic level or energy level to organisms in the next trophic level. … Producers are always the first trophic level, herbivores the second, the carnivores that eat herbivores the third, and so on.

Which 3 ecosystems have the highest productivity?

In terms of NPP per unit area, the most productive systems are estuaries, swamps and marshes, tropical rain forests, and temperate rain forests (see Figure 4).

Which ecosystem is having highest productivity?

In aquatic ecosystems, coral reefs have the highest productivity. Tropical rainforests show the highest productivity in terrestrial ecosystems.

Which of the following ecosystems is least productive?

So, the correct answer is ‘Open oceans’.

What is the gross primary productivity?

Gross primary productivity is the amount of carbon fixed during photosynthesis by all producers in the ecosystem. However, a large part of the harnessed energy is used up by the metabolic processes of the producers (respiration).