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Bacterial Signaling01:30

Bacterial Signaling

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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  1. Home
  3. Temporal Beta Diversity Of Bacteria In Streams: Network Position Matters But Differently For Bacterioplankton And Biofilm Communities.
  1. Home
  3. Temporal Beta Diversity Of Bacteria In Streams: Network Position Matters But Differently For Bacterioplankton And Biofilm Communities.

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Temporal Beta Diversity of Bacteria in Streams: Network Position Matters But Differently for Bacterioplankton and

Kaisa-Leena Huttunen1,2, Jacqueline Malazarte3, Jussi Jyväsjärvi4,5

  • 1Finnish Environment Institute, Nature Solutions Unit, Oulu, Finland. kaisa-leena.huttunen@syke.fi.

Microbial Ecology
|April 11, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Temporal changes in aquatic bacterial communities, including bacterioplankton and biofilm, reveal higher diversity in headwaters. Environmental variability and land-water connections significantly influence bacterial community composition across stream networks.

Keywords:
Aquatic bacteriaCommunity compositionHeadwatersStream networkStream-forest linkagesTemporal variability

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Area of Science:

  • Microbial ecology
  • Stream ecology
  • Biodiversity research

Background:

  • Growing concern over biodiversity loss has spurred research into temporal changes in alpha-diversity.
  • Temporal beta-diversity, a measure of community change over time, has received less research attention.
  • Understanding microbial community dynamics in freshwater ecosystems is crucial for assessing ecosystem health.

Purpose of the Study:

  • To investigate temporal beta-diversity of bacterioplankton, biofilm, and soil bacteria within a pristine stream network.
  • To assess the influence of stream network position and environmental variability on temporal bacterial diversity.
  • To test hypotheses regarding bacterial community stability in headwater versus mainstem environments.

Main Methods:

  • Repeated sampling of bacterioplankton, biofilm, and riparian soil bacteria throughout the open-water season.
  • Analysis of bacterial community composition using amplicon sequence variants (ASVs).
  • Correlation of temporal beta-diversity with environmental variables (water chemistry, temperature) and network position.

    • Main Results:

    • Temporal beta-diversity of bacterioplankton decreased from headwaters to mainstems, correlating positively with water chemistry variability.
    • Biofilm bacterial temporal beta-diversity showed an opposite pattern, decreasing towards mainstems and correlating negatively with temperature variability.
    • Soil bacterial communities exhibited high temporal beta-diversity, strongly linked to soil environmental variability, independent of stream network position.

    Conclusions:

    • Bacterial communities in aquatic habitats and riparian soils are distinct, with decreasing soil-aquatic connectivity along the stream network.
    • Headwater bacterial communities, particularly bacterioplankton, display higher temporal variability, influenced by riparian soil inputs and land-water connections.
    • High temporal variability in bacterial communities underscores the necessity of temporal replication for comprehensive biodiversity assessments in stream networks.