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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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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...
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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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Insect defoliation enhances nitrate export from forest ecosystems.

W T Swank1, J B Waide2, D A Crossley3

  • 1Coweeta Hydrologic Laboratory, 28763, Otto, North Carolina.

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Summary
This summary is machine-generated.

Severe fall cankerworm infestations significantly increased nitrate nitrogen export from Appalachian forests. This highlights the crucial role of insect consumers in regulating ecosystem processes on a landscape scale.

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Area of Science:

  • Forestry
  • Ecology
  • Entomology

Background:

  • Forest ecosystems are sensitive to disturbances.
  • Insect outbreaks can have significant environmental impacts.
  • Nutrient cycling is a key ecosystem process.

Purpose of the Study:

  • To investigate the impact of chronic defoliation by the fall cankerworm (Alsophila pometaria) on stream export of nitrate nitrogen.
  • To demonstrate the measurable effect of insect consumers on ecosystem processes.
  • To provide evidence for the regulatory importance of insects on a landscape scale.

Main Methods:

  • Monitoring nitrate nitrogen (NO3-N) export in streams draining three mixed hardwood forests in the southern Appalachians.
  • Assessing the extent and duration of defoliation caused by fall cankerworm outbreaks.

Main Results:

  • Chronic defoliation by the fall cankerworm was accompanied by substantial increases in stream export of nitrate nitrogen.
  • A clear link was established between insect herbivory and altered nitrogen cycling.

Conclusions:

  • Insect consumers, specifically the fall cankerworm, exert a measurable influence on ecosystem processes.
  • Insects play a significant regulatory role in nutrient dynamics at a landscape level.