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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
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Nutrients and temperature additively increase stream microbial respiration.

David W P Manning1, Amy D Rosemond1, Vladislav Gulis2

  • 1Odum School of Ecology, University of Georgia, Athens, GA, USA.

Global Change Biology
|September 14, 2017
PubMed
Summary
This summary is machine-generated.

Nutrient enrichment does not alter the temperature dependence of stream respiration. Increased temperature and nutrient (nitrogen and phosphorus) availability have additive effects on microbial respiration rates in aquatic ecosystems.

Keywords:
benthic organic mattermetabolic theory of ecologymicrobial activitynitrogenphosphorusriverstemperature dependence

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Area of Science:

  • Aquatic ecology
  • Biogeochemistry
  • Microbial ecology

Background:

  • Rising global temperatures and nutrient enrichment are key drivers of environmental change.
  • The impact of nutrient enrichment on the temperature dependence of microbial respiration in aquatic ecosystems is not well understood.

Purpose of the Study:

  • To investigate how nutrient additions (nitrogen and phosphorus) affect the temperature dependence of detrital respiration in forest streams.
  • To determine the role of microbial communities, specifically fungi, in mediating these responses.

Main Methods:

  • Measurements of respiration rates for leaf litter, wood, and fine benthic organic matter (FBOM) across seasonal temperature gradients.
  • Experimental nutrient (nitrogen and phosphorus) additions to forest streams at varying concentrations and N:P ratios.
  • Application of the metabolic theory of ecology to assess temperature dependence and microbial drivers of respiration.

Main Results:

  • Detrital respiration rates increased with temperature, with consistent activation energies across substrates.
  • Nutrient enrichment increased respiration rates for leaf litter and wood, but not FBOM.
  • Temperature dependence of respiration remained consistent despite nutrient additions, suggesting additive effects of temperature and nutrients.

Conclusions:

  • The temperature dependence of stream microbial respiration is robust to nutrient enrichment.
  • Increased temperature and combined nitrogen and phosphorus availability have additive and comparable effects on microbial respiration rates in aquatic systems.