Question: What Level Of Productivity Would One Predict With High Levels Of Water Supply But Low Temperatures?

Which of the following organisms would you predict to have the highest production efficiency?

Plants have the greatest net production efficiencies, which range from 30-85%. The reason that some organisms have such low net production efficiencies is that they are homeotherms, or animals that maintain a constant internal body temperature.

Which factor is the primary control of productivity in aquatic systems?

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.

How does temperature affect primary productivity?

Increasing temperatures may affect macroalgal assemblages in three ways: 1) higher respiration rates can change the ratio of photosynthesis to respiration, decreasing long-term net primary productivity; 2) the combination of high temperature and high irradiance may increase photoinhibition, thereby decreasing NPP

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Which organism is most likely to have the highest assimilation efficiency?

Herbivores assimilate between 15 and 80 percent of the plant material they ingest, depending on their physiology and the part of the plant that they eat. For example, herbivores that eat seeds and young vegetation high in energy have the highest assimilation efficiencies,…

Which 3 ecosystems have the highest productivity?

The world’s ecosystems vary tremendously in productivity, as illustrated in the following figures. In terms of NPP per unit area, the most productive systems are estuaries, swamps and marshes, tropical rain forests, and temperate rain forests (see Figure 4).

What ecosystem has the highest net primary productivity?

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

What are the factors affecting primary productivity?

For terrestrial plants, many factors affect productivity, including light, temperature, nutrients, soil, and water. For phytoplankton, soil is obviously not needed, and water availability is not an issue.

Which factor is the primary control of productivity in a Lentic system?

A large body of data clearly indicates that phytoplankton production and biomass in most lentic systems is controlled by P supply (Schindler, 1978; Wetzel, 1983a; Hecky and Kilham, 1988).

How do you calculate primary productivity?

Primary productivity is usually determined by measuring the uptake of carbon dioxide or the output of oxygen. Production rates are usually expressed as grams of organic carbon per unit area per unit time.

How does water temperature affect primary productivity?

Our findings indicate that warming directly increased carbon specific primary productivity, which was more pronounced under low grazing pressure. On the other hand, primary productivity per unit water volume did not respond to increased temperature, because of a negative temperature effect on phytoplankton biomass.

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Do light levels affect primary productivity?

The results of the present study also showed that primary productivity was limited by light and not by nutrients, but in contrast to the previous paper, higher levels of PAR decreased the productivity in nutrient-poor lakes.

How does water temperature relate to productivity?

The most likely explanation is that the warmer the surface waters become, the less mixing there is between those waters and deeper, more nutrient-rich water. As nutrients become scarce at the surface, where phytoplankton grow, productivity declines.

What factors affect assimilation efficiency?

Absorption efficiency of nutrients is affected by digestive tract morphology, food type and quality, seasonality, meal size, time between meals, and the nutritional state of the animal. Manatees occasionally consume only the leaves of plants and at other times dig up rhizomes and consume the entire plant.

How do you calculate assimilation?

The assimilation efficiency (AE) = (I−E)/I × 100%, where I is the ingestion rate and E is the egestion (defecation) rate.

What is net production efficiency?

Net production efficiency: percentage of assimilated energy that goes into growth and reproduction. Plants’ net production efficiency is the ratio of net production to gross production, between 30 and 85%

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