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Temporal variability of bacterioplankton is habitat driven
Ulrike Obertegger1, Stefan Bertilsson2, Massimo Pindo1
1Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy.
Molecular Ecology
|September 4, 2018
Summary
Lake bacterioplankton communities varied significantly across habitats and years, with local conditions driving distinct temporal patterns. Hydrology played a key role in shaping these microbial communities.
Area of Science:
- Aquatic microbiology
- Limnology
- Ecology
Background:
- Bacterioplankton community (BC) dynamics across multiple lake habitats and years are understudied.
- Understanding BC variability in relation to environmental factors is crucial for lake ecosystem health.
Purpose of the Study:
- To investigate the temporal dynamics of bacterioplankton communities in three distinct Lake Tovel habitats (littoral, pelagic euphotic, hypolimnion).
- To correlate BC composition with habitat-specific environmental factors, particularly hydrology.
Main Methods:
- Monthly sampling of BC composition from April 2014 to May 2017.
- High-throughput sequencing of the 16S rRNA gene (V3-V4 region).
- Statistical analyses including PERMANOVA, nonmetric multidimensional scaling, and source-sink analysis.
Main Results:
- Significant differences in BC composition were observed among the three habitats.
- The littoral habitat exhibited the highest BC variability, while the hypolimnion showed the greatest stability.
- The BC composition in the rainy year 2014 was distinct from other years; seasonal differences were primarily observed in spring.
Conclusions:
- Habitat-specific environmental conditions, especially the hydrological gradient, significantly influenced temporal BC patterns.
- Local environmental factors are key drivers of distinct bacterioplankton communities within Lake Tovel, despite potential dispersal.
- The study highlights the importance of considering habitat heterogeneity in lake microbial ecology.
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