Which of these is a consequence of biological magnification?
a. Toxic chemicals in the environment pose greater risk to top-level predators than to primary consumers.
b. Populations of top-level predators are generally smaller than populations of primary consumers.
c. The biomass of producers in an ecosystem is generally higher than the biomass of primary consumers.
d. Only a small portion of the energy captured by producers is transferred to consumers.

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Understand the role of fungi in an ecosystem: Fungi are decomposers, meaning they break down dead organic matter, recycling nutrients back into the ecosystem.

Consider the effect of a fungicide: A fungicide is a chemical that kills fungi. Applying it to a cornfield would reduce the population of fungi, thereby affecting decomposition.

Analyze the impact on decomposition rate: With fewer fungi, the rate of decomposition would likely decrease because there are fewer organisms to break down organic matter.

Evaluate the effect on net ecosystem production (NEP): NEP is the balance between the total amount of carbon fixed by photosynthesis and the total amount of carbon released by respiration. If decomposition decreases, less carbon is released back into the atmosphere, potentially increasing NEP.

Conclude the expected changes: Based on the analysis, applying a fungicide would likely decrease the decomposition rate and increase NEP, aligning with option d.

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Decomposition Rate

Decomposition rate refers to the speed at which organic matter is broken down by decomposers, such as fungi and bacteria, into simpler substances. This process is crucial for nutrient cycling in ecosystems, as it releases nutrients back into the soil, making them available for plant uptake. Applying a fungicide can reduce the population of fungi, potentially slowing down the decomposition rate.

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Metabolic Rate

Net Ecosystem Production (NEP)

Net Ecosystem Production (NEP) is the balance between the total amount of carbon dioxide absorbed by photosynthesis and the carbon dioxide released through respiration and decomposition in an ecosystem. NEP indicates the net carbon storage in an ecosystem. If decomposition decreases due to fungicide application, less carbon is released, potentially increasing NEP as more carbon is stored.

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Making Sense of Ecosystem Production & Efficiency

Impact of Fungicides

Fungicides are chemical agents used to kill or inhibit the growth of fungi. In agricultural settings, they are applied to protect crops from fungal diseases. However, their use can disrupt the natural decomposition process by reducing fungal populations, which are key decomposers. This disruption can affect nutrient cycling and carbon dynamics, influencing both decomposition rates and NEP.

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