In aquatic ecosystems, primary productivity is driven by the availability of nutrients and light and, to a lesser extent, by temperature and other factors.
What controls 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.
What factors control primary production in ecosystems?
Production varies among ecosystems, as well as over time within ecosystems. Rates of production are determined by such factors as climate and nutrient supply. Precipitation is the dominant control worldwide, but nutrient availability often limits primary production in any particular, local system.
What are the controls on primary production?
This chapter deals with selected variables (light, nutrients, and temperature) that function as proximate or immediate controls of abundance and activity of marine primary producers. Grazing and sinking, two other major proximate factors affecting producers, are discussed in Sects.
What factors affect primary production?
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.
What is primary production in ocean?
Primary production is the creation of new organic matter from inorganic substrates, and it is this organic matter that serves as the base of the food web for most marine consumers.
What is primary production in sea?
Marine primary production is the chemical synthesis in the ocean of organic compounds from atmospheric or dissolved carbon dioxide.
What are the two main factors affecting primary production?
We focus on two major variables—light and nutrients—and their role in determining primary production.
What limits the net primary production in aquatic ecosystems?
What limits the net primary production in aquatic ecosystems such as lakes and streams? The amount of light energy converted to chemical energy by an ecosystem’s autotrophs in a given time period is an ecosystem’s primary production, limits the net primary production in aquatic ecosystems such as lakes and streams.
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 is the main product of primary production?
The main products of primary production are carbohydrates. How do scientists measure primary production? Scientist measure primary production by turning the amount of carbon into living things. The more carbons per square, the more productive the ecosystem is.
What is aquatic productivity?
The productivity of aquatic systems has been given two meanings in the literature: either the transfer of matter or energy through the food web, or the quantity of fish that may be captured in a sustainable way per unit of time. A number of short-cuts may be used to estimate the sustainable fish catch.
Who is the primary producer in the ecosystem?
Primary producers are also called autotrophs, which obtain energy from the natural atmosphere like sunlight, water, and obtain some sources from nonliving things and produce food by the process called photosynthesis.