More than 90 percent of the primary productivity in the ocean is accomplished by?

1. What causes primary productivity in the ocean?
2. Where is primary productivity highest in the ocean?
3. What types of organisms account for 90 96 percent of the ocean's primary productivity?
4. What causes high primary productivity?
5. What is the percentage of primary productivity in ocean?
6. How is primary productivity in the ocean measured?
7. What is the key to primary productivity in ocean water quizlet?
8. What is the productivity of oceans?
9. What planktonic group may account for up to 80% of all the photosynthetic activity in some parts of the open ocean?
10. How much of the ocean primary productivity do dinoflagellates account for?
11. How do seaweeds and marine plants contribute to the primary productivity of the ocean?
12. How do you find primary productivity?
13. What is the process of primary productivity?
14. What factors limit primary production in aquatic ecosystems?
15. What limits primary productivity in tropical oceans?
16. Is primary productivity higher in warm water?
17. Why are cold oceans more productive?

What causes primary productivity in the ocean?

Most primary productivity in the oceans is carried out by free-floating phytoplankton in the open ocean rather than by bottom-dwelling (benthic) plants, with chemoautotrophs contributing smaller amounts as producers in deep-sea-vent habitats.

Where is primary productivity highest in the ocean?

Higher chlorophyll concentrations and in general higher productivity are observed on the equator, along the coasts (especially eastern margins), and in the high latitude ocean (Figure 4a and b).

What types of organisms account for 90 96 percent of the ocean's primary productivity?

Phytoplankton are the primary producers (autotrophs). Zooplankton are primary and secondary consumers that feed on phytoplankton and other heterotrophic plankton. Phytoplankton are the most important primary producers in the sea, responsible for between 92 and 96 percent of the oceans' primary productivity.

What causes high primary productivity?

A high primary productivity rate in the ecosystems is obtained when the physical factors (for instance: water, nutrients and climate) are favourable. The presence of some forms of secondary energy can also help to increase the primary productivity rate.

What is the percentage of primary productivity in ocean?

Despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons.

How is primary productivity in the ocean measured?

Primary productivity can be measured from the amount of oxygen consumed by a volume of water in a fixed period of time; water for which productivity is to be determined is enclosed in sealed white and dark bottles (bottle painted dark so light would not enter).

What is the key to primary productivity in ocean water quizlet?

The main limiting productivity factor in tropical oceans is the availability of nutrients.

What is the productivity of oceans?

The productivity of the entire ocean is estimated to be approximately 16 × 10¹⁰ tons of carbon per year, which is about eight times that of the land.

What planktonic group may account for up to 80% of all the photosynthetic activity in some parts of the open ocean?

Scientists estimate half of global photosynthetic carbon fixation and 50-80% of oxygen production on Earth comes from the ocean. Most of this production is from marine phytoplankton – drifting seaweed, marine algae, and some photosynthetic bacteria called cyanobacteria.

How much of the ocean primary productivity do dinoflagellates account for?

Although they are very small, on the order of 0.2-2 micrometers long, they can be found in very high concentrations, and may be responsible for up to 70% of all productivity in some parts of the ocean.

How do seaweeds and marine plants contribute to the primary productivity of the ocean?

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 do you find primary productivity?

To calculate NPP, you take the total amount of carbon that the plant ​fixes​ (or turns into usable material) and subtract the amount of carbon lost during respiration. The total amount of carbon taken in by the plant is known as the ​gross primary productivity​ (GPP), and the amount of respiration is known as ​R_a​.

What is the process of primary productivity?

Primary productivity is the process by which organisms make their own food from inorganic sources. ... These organisms are known as autotrophs, since they can use inorganic substrates and solar energy to carry out metabolic processes and build cellular material.

What factors limit primary production in aquatic ecosystems?

In aquatic ecosystems, light and nutrients limit primary production.

What limits primary productivity in tropical oceans?

Primary productivity in tropical oceans is limited by the amount of nutrients available.

Is primary productivity higher in warm water?

Primary production had positive correlations with water temperature when nutrient concentrations and light availability were not limiting, whereas increased water temperature under unsaturated light conditions, which limits the carbon incorporation process, led to decreased primary production due to the enhancement of ...

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).