You asked: Why only the net primary productivity of an ecosystem or biome is available to higher trophic levels?

There are several reasons. One is that not all the organisms at a lower trophic level get eaten by those at a higher trophic level. Another is that some molecules in the bodies of organisms that do get eaten are not digestible by predators and are lost in the predators’ feces (poop).

How does net primary productivity affect the number of trophic levels within an ecosystem?

On average, only about 10% of the energy stored as biomass in one trophic level—e.g., primary producers—gets stored as biomass in the next trophic level—e.g., primary consumers. Put another way, net productivity usually drops by a factor of ten from one trophic level to the next.

Why do higher trophic levels have less biomass?

Trophic Levels and Biomass

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With less energy at higher trophic levels, there are usually fewer organisms as well. Organisms tend to be larger in size at higher trophic levels, but their smaller numbers result in less biomass.

Why is the net primary productivity of an ecosystem important?

Net primary production provides the energy for all heterotrophic activity. Consumers capture the energy stored within the organic molecules of their food sources. Therefore, each trophic level acquires the energy represented by the biomass consumed from the lower trophic level.

Where is net primary productivity NPP most prevalent and why?

About 40 to 85 percent of gross primary productivity is not used during respiration and becomes net primary productivity. The highest net primary productivity in terrestrial environments occurs in swamps and marshes and tropical rainforests; the lowest occurs in deserts.

Why does primary productivity vary from ecosystem to ecosystem?

The primary productivity varies from ecosystem to ecosystem as it depends on the plant species and the environmental surrounding and its ability to carry out photosynthesis. … It also depends upon other factors like soil conditions, moisture, temperature, etc.

What is the key difference between primary productivity and net primary productivity?

What is the key difference between primary productivity and net primary productivity? Net primary productivity represents just the energy used to build biomass. Net primary productivity is a small fraction (often ~10%) of primary productivity.

Why are there fewer organisms less biomass at the top of the trophic pyramid than at the bottom?

Energy that is lost to heat must be replaced by more energy. … There are usually fewer organisms at the top pyramid levels because there is much less energy available.

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What is high net primary productivity?

They show net primary productivity, which is how much carbon dioxide vegetation takes in during photosynthesis minus how much carbon dioxide the plants release during respiration (metabolizing sugars and starches for energy). …

Why does there have to be less biomass at each level moving upward?

When organisms are consumed in the foodchain, only energy stored as TISSUE is transferred. Therefore, at each stage of the food chain, less energy and biomass is transferred between organisms than at the previous trophic level.

Which of the following best describes the net primary productivity of an ecosystem?

Which of the following best describes the net primary productivity of an ecosystem? … Net primary productivity is the amount of energy lost through respiration by producers subtracted from the gross primary productivity of an ecosystem.

Why ecosystem productivity is crucial?

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.

Which biome has higher net primary productivity tropical rainforest or tundra?

As you might expect, the terrestrial biome with the highest level of primary productivity is the tropical rainforest biome with around 2,200 grams of biomass per square meter per year.