The flux of energy and matter through ecosystems - Primary productivity

3 important questions on The flux of energy and matter through ecosystems - Primary productivity

What does this pattern suggest regarding the factors that limit the productivity?

Might suggest that radiation (resource) and temperature (condition) are limiting the productivity of communities.

By what is productivity limited in the sea?

By a shortage of nutrients.

Which mineral nutrient has the strongest influence on community productivity and where does it occur?

Fixed nitrogen. It occurs in inorganic ions such as nitrate.

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