Diatoms Role in Traceability of Soil Microorganisms – A Short Report

Roxana Vidican, Lucian Ionescu, Vlad Stoian

Abstract


Diatoms are one of the most common types of phytoplankton, found seldom in soil but in high amounts in both salty waters and fresh waters, generating almost 20% of the oxygen that the planet produces every year. Diatoms are used in the monitorization of the environment’s conditions and also in observations regarding the quality of soil and water, and also in soil microorganisms traceability. The samples have been collected from both soil and Gheorgheni Lake every month during a year at the same date. There is a lack of diatoms in winter (December, January) and reappearing in smaller numbers in February. March is the most prolific month regarding the identified number of species. October is the most abundant month regarding the diatoms per analyzed sample. In November, the number of diatoms is pretty high, but comparing to October, the numbers are lowering. This variation from month to month is mostly due to the water temperature that keeps on changing. If we were to compare November 2017 to November 2018, we can notice a significant rise of diatoms and also a rise in species identified per sample from one year to another. The trophic characterization of aquatic ecosystems based on the phytoplankton indicates a high value of primary production (Polytrophic) in the Gheorgheni Lake. We can observe the seasonal variation of diatom species due to temperature variation specific to each season. The most abundant species identified during the monitoring is Synedra acus, having a larger spectrum of temperature in which it grows and it is one of the most resistant when it comes to anthropic pollution.


Keywords


diatoms, phytoplankton, temperature variation, trophic characterization.

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