What is the primary productivity hypothesis?

The primary productivity or "bottom up" hypothesis suggests that plant growth is limited by the energy available to plants, which is determined in turn by temperature and precipitation. Additional plant growth means more forage is available—thus herbivores, and ultimately carnivores, should increase in abundance.

1. What is meant by primary productivity?
2. How is primary productivity measured?
3. What is primary production and examples?
4. What type of correlations would you predict under the trophic cascade hypothesis?
5. What is primary productivity in AP environmental science?
6. What is primary productivity and why is it important?
7. What is primary productivity in Lake?
8. What is primary productivity give brief description of factors that affect primary productivity?
9. What is primary productivity in oceanography?
10. Where is primary productivity the most prevalent?
11. What is primary productivity and secondary productivity?
12. What is primary production stage?
13. How is primary productivity measured in an aquatic environment?
14. What happens in a trophic cascade?
15. What is high net primary productivity?

What is meant by primary productivity?

primary productivity, in ecology, the rate at which energy is converted to organic substances by photosynthetic producers (photoautotrophs), which obtain energy and nutrients by harnessing sunlight, and chemosynthetic producers (chemoautotrophs), which obtain chemical energy through oxidation.

How is primary productivity 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 primary production and examples?

The primary production stage of the supply chain encompasses agricultural activities, aquaculture, fisheries and similar processes resulting in raw food materials. ... Examples of primary production activities are: farming, fishing, livestock rearing and other production methods.

What type of correlations would you predict under the trophic cascade hypothesis?

What type of correlations would you predict under the trophic cascade? the correlation would be negative because a change in the upper trophic level causes the opposite effect in the lower level.

What is primary productivity in AP environmental science?

Primary productivity is the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances. total amount of productivity in a region or system is. net primary production (NPP) -the amount of energy that is actually stored in the plant after respiration processes.

What is primary productivity and why is it important?

In aquatic ecosystems, primary productivity is driven by the availability of nutrients and light and, to a lesser extent, by temperature and other factors. Primary productivity is important because it is the process that forms the foundation of food webs in most ecosystems.

What is primary productivity in Lake?

Measurements of primary production can account for both photosynthesis and respiration. Gross primary production (GPP) is the total carbon uptake by the phytoplankton, whereas Net Primary Production (NPP) is GPP – R or the difference between carbon uptake due to photosynthesis and carbon loss due to respiration.

What is primary productivity give brief description of factors that affect primary productivity?

Primary productivity refers to the total organic matter produced by primary producers per unit area per unit time. It is affected by nutrient availability, types and number of primary producers present in an ecosystem, temperature, sunlight, water, precipitation etc.

What is primary productivity in oceanography?

Primary productivity is the rate at which atmospheric or aqueous carbon dioxide is converted by autotrophs (primary producers) to organic material. Primary production via photosynthesis is a key process within the ecosystem, as the producers form the base of the entire food web, both on land and in the oceans.

Where is primary productivity the most prevalent?

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

What is primary productivity and secondary productivity?

The unit of mass can relate to dry matter or to the mass of generated carbon. The productivity of autotrophs, such as plants, is called primary productivity, while the productivity of heterotrophs, such as animals, is called secondary productivity.

What is primary production stage?

Primary production: this involves acquiring raw materials. ... Secondary production: this is the manufacturing and assembly process. It involves converting raw materials into components, for example, making plastics from oil. It also involves assembling the product, eg building houses, bridges and roads.

How is primary productivity measured in an aquatic environment?

Primary productivity is considered in terms of its evolution from measures of standing crop and yield, which have been gradually replaced by measures of rate of carbon uptake or oxygen production, or by measure of nutrient loss, or by change of COa in the environment.

What happens in a trophic cascade?

trophic cascade, an ecological phenomenon triggered by the addition or removal of top predators and involving reciprocal changes in the relative populations of predator and prey through a food chain, which often results in dramatic changes in ecosystem structure and nutrient cycling.

What is high net primary productivity?

The primary productivity of an ecosystem is defined as the speed at which the solar energy is turned into an organic substance by chlorophyll in the photosynthesis. ... A high primary productivity rate in the ecosystems is obtained when the physical factors (for instance: water, nutrients and climate) are favourable.