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Related Concept Videos

Primary Production01:06

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
Microbial Wastewater Treatment01:30

Microbial Wastewater Treatment

Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
Sources of Food Contamination01:29

Sources of Food Contamination

Contamination of food by microbial agents and natural toxins poses significant risks to public health. These hazards can be introduced at various points across the food supply chain, ranging from environmental sources to processing and storage stages. Understanding these contamination pathways is critical for developing strategies to ensure food safety.Seafood is particularly vulnerable to contamination through both environmental exposure and microbial colonization. Toxins from harmful algal...
Freshwater Microbial Ecology01:24

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
The Nitrogen Cycle01:49

The Nitrogen Cycle

Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
The Phosphorus Cycle01:21

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

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Related Experiment Video

Updated: Jun 10, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

Eutrophication potential of food consumption patterns.

Xiaobo Xue1, Amy E Landis

  • 1Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15261, USA. xix17@pitt.edu

Environmental Science & Technology
|August 14, 2010
PubMed
Summary

Reducing your food

Area of Science:

  • Environmental Science
  • Nutrient Cycling
  • Food Systems Analysis

Background:

  • Growing public concern over food's environmental impact and carbon footprints.
  • Significant environmental degradation and economic losses stem from disrupted nitrogen and phosphorus cycles.
  • Limited systematic evaluation of life cycle nutrient flows across diverse food types.

Purpose of the Study:

  • To characterize nitrogen and phosphorus flows in food production, processing, packaging, and distribution.
  • To compare the carbon footprints and nitrogen equivalent footprints of various food groups.
  • To evaluate solutions for reducing excessive nitrogen outputs and assess their effectiveness.

Main Methods:

  • Life cycle assessment of eight distinct food types.

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Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island
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Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island

Published on: July 14, 2023

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Last Updated: Jun 10, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout (Salvelinus namaycush) from Its Prey
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Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout (Salvelinus namaycush) from Its Prey

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Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island
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  • Comparative analysis of carbon footprints and nitrogen equivalent footprints.
  • Evaluation of dietary shift scenarios and mitigation strategies.

    • Main Results:

    • Food groups exhibit highly variable nitrogen intensity; red meat and dairy have significantly higher nitrogen requirements than cereals.
    • Nitrogen footprints do not consistently correlate with carbon footprints (e.g., dairy and chicken have high N, low C footprints).
    • Dietary shifts from red meat and dairy to cereals are effective in lowering personal nitrogen footprints.

    Conclusions:

    • Understanding and quantifying food's nitrogen footprint is crucial for environmental management.
    • Dietary choices significantly impact nutrient cycles and environmental quality.
    • Targeted dietary changes offer a viable strategy for mitigating nitrogen pollution from food consumption.