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Related Concept Videos

Methods to Assess Microbial Communities01:19

Methods to Assess Microbial Communities

Microbial communities, comprising bacteria, archaea, and eukaryotic microorganisms, inhabit diverse ecosystems and play crucial roles in environmental and biological processes. Their diversity is defined by three main parameters: species richness (the number of distinct species), species abundance (the relative quantity of each species), and species evenness (how uniformly individual species are distributed in various locations). These factors together shape the structure and ecological balance...
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Assessing microbial populations is crucial for understanding microbial roles in health, ecology, and industry. Various complementary techniques—both culture-based and molecular—enable detailed analysis of microbial abundance, diversity, and function.Viable Plate CountThe viable plate count is a traditional culture-based method used to estimate the number of living microbes in a sample. After serial dilution, the sample is spread onto nutrient agar plates. Each viable cell forms a visible...
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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.

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Assessing effects of the pharmaceutical ivermectin on meiobenthic communities using freshwater microcosms.

Marvin Brinke1, Sebastian Höss, Guido Fink

  • 1University of Bielefeld, Department of Animal Ecology, Morgenbreede 45, 33615 Bielefeld, Germany. marvin.brinke@uni-bielefeld.de

Aquatic Toxicology (Amsterdam, Netherlands)
|May 11, 2010
PubMed
Summary
This summary is machine-generated.

Ivermectin poses a high risk to freshwater meiobenthic communities, especially nematodes, with effects seen at low sediment concentrations. This highlights the need to prevent ivermectin entry into aquatic environments.

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Area of Science:

  • Environmental Toxicology
  • Aquatic Ecology
  • Ecotoxicology

Background:

  • Ivermectin is a veterinary drug toxic to non-target organisms.
  • Its impact on benthic freshwater species is poorly understood.
  • Ivermectin's persistence in sediments raises ecological concerns.

Purpose of the Study:

  • To assess ivermectin's impact on freshwater meiobenthic communities.
  • To determine no-observed-effect concentrations (NOECs) for community and nematode levels.
  • To evaluate the risk posed by ivermectin in aquatic sediments.

Main Methods:

  • Indoor microcosms simulating benthic environments.
  • Sediment spiking with ivermectin at 0.9, 9, and 45 microg kg(-1) dw.
  • Assessment of meiobenthic abundance and nematode species composition over 224 days.

Main Results:

  • Benthic microcrustaceans and nematodes were sensitive to ivermectin; tardigrades benefited.
  • Community NOEC was 6.2 microg kg(-1) dw; nematode NOEC was 0.6 microg kg(-1) dw.
  • Ivermectin's NOECs are near predicted environmental concentrations, indicating high risk.

Conclusions:

  • Ivermectin significantly impacts freshwater meiobenthic communities, particularly nematodes.
  • The derived NOECs suggest a high risk to benthic organisms in contaminated sediments.
  • Preventing ivermectin's release into aquatic ecosystems is crucial for environmental protection.