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Long-Term Phytoplankton Dynamics in a Complex Temporal Realm.

M Alvarez-Cobelas¹, C Rojo², J Benavent-Corai²

¹National Museum of Natural History (CSIC), c/ Serrano 115 dpdo, Madrid, E-28006, Spain. malvarez@mncn.csic.es.

Scientific Reports

|November 6, 2019

Summary

This summary is machine-generated.

Phytoplankton biomass shows long-term decreasing trends and multi-scale periodicities. Environmental factors like nitrogen and temperature influence different phytoplankton groups across various timescales, revealing complex community dynamics.

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Area of Science:

Ecology
Limnology
Environmental Science

Background:

Long-term ecological studies are crucial for understanding biotic community dynamics in changing environments.
Phytoplankton communities are key indicators of aquatic ecosystem health and are sensitive to environmental shifts.

Purpose of the Study:

To investigate the long-term dynamics of phytoplankton biomass and taxonomic group biomass (TGBs) in a meso-oligotrophic lake over 25 years.
To identify the controlling factors influencing phytoplankton biomass trends and periodicities at various timescales.
To understand how different phytoplankton groups respond to environmental drivers and contribute to overall community dynamics.

Main Methods:

Conducted a 25-year monthly sampling study of lake phytoplankton.
Analyzed long-term trends and multi-scale periodicities in total biomass (TB) and TGBs.
Correlated phytoplankton dynamics with environmental factors such as nitrogen concentration, temperature, and water chemistry.

Main Results:

Observed decreasing trends in TB and TGBs over the 25-year period.
Identified decadal periodicity in TB linked to nitrogen and Cryptophytes.
Found annual periodicities related to temperature, influencing Chlorophytes and Dinoflagellates.
Revealed that analysis by specific periods highlights dynamics (e.g., Diatoms) obscured in complete series analysis.

Conclusions:

Phytoplankton communities exhibit distinct temporal dynamics at monthly to decadal scales.
Environmental factors (climate, water physics/chemistry) operate at different timescales and affect specific TGBs.
A holistic approach integrating "taxonomical group-control factor-trend and periodicity" is essential for explaining non-stationary phytoplankton dynamics.