Microorganisms as Indicators of Environmental Changes

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Environmental Microbiology".

Deadline for manuscript submissions: closed (30 June 2025) | Viewed by 855

Special Issue Editor


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Guest Editor
Faculty of Biology, Sofia University "St. Kliment Ohridski", Sofia, Bulgaria
Interests: bioindication of polluted soils; microbiological monitoring; ecology and environmental protection

Special Issue Information

Dear Colleagues,

Environmental changes are events that occur as a result of both natural and human processes. The transformation and transportation of large quantities of energy and materials due to ecosystem function and human activities contribute significantly to these processes. Physical and chemical indicators can provide information about the scale of the changes, but bioindicator species can be used for the accurate assessment of the impact of these changes. Among all organisms, microorganisms play a crucial role in biogeochemical cycles in aquatic and terrestrial ecosystems. Since they are widely distributed and highly sensitive to changes, microorganisms can be used as bioindicators for environmental alterations. They can respond quickly via changing their number, species composition, distribution, and activity. These properties make them an early warning system for environmental changes and the consequences that follow. This will provide insights into the future development of natural ecosystems.

The focus of this Special Issue of Microorganisms is to publish articles related to the use of microorganisms as indicators for natural and human-induced changes on the global and local scales, such as climate change, deforestation, acidification, soil and water pollution, desertification, and invasive species. As Guest Editors, we welcome you to submit research articles on the microbial bioindicators of environmental changes.

Dr. Silvena B. Boteva
Guest Editor

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Keywords

  • microbial
  • environment
  • indicator

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Published Papers (1 paper)

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Research

17 pages, 2518 KiB  
Article
Bacterial Metabolic Activity of High-Mountain Lakes in a Context of Increasing Regional Temperature
by Boyanka Angelova, Ivan Traykov, Silvena Boteva, Martin Tsvetkov and Anelia Kenarova
Microorganisms 2025, 13(6), 1375; https://doi.org/10.3390/microorganisms13061375 - 13 Jun 2025
Viewed by 662
Abstract
Global warming poses a significant threat to lake ecosystems, with high-mountain lakes being among the earliest and most severely impacted. However, the processes affecting water ecology under climate change remain poorly understood. This study investigates, for the first time, the effects of regional [...] Read more.
Global warming poses a significant threat to lake ecosystems, with high-mountain lakes being among the earliest and most severely impacted. However, the processes affecting water ecology under climate change remain poorly understood. This study investigates, for the first time, the effects of regional warming on three high-mountain lakes, Sulzata, Okoto and Bubreka, located in the Rila Mountains, Bulgaria, by examining shifts in bacterial metabolic capacity in relation to the rate and range of utilizable carbon sources using the Biolog EcoPlate™ assay. Over the last decade, ice-free water temperatures in the lakes have risen by an average of 2.6 °C, leading to increased nutrient concentrations and enhanced primary productivity, particularly in the shallowest lake. Bacterial communities responded to these changes by increasing their metabolic rates and shifting substrate preferences from carbohydrates to carboxylic acids. While the utilization rates of some carbon sources remained stable, others showed significant changes—some increased (e.g., D-galactonic acid γ-lactone and itaconic acid), while others decreased (e.g., α-D-lactose and D-xylose). The most pronounced effects of warming were observed in June, coinciding with the onset of the growing season. These findings suggest that rising temperatures may substantially alter bacterial metabolic potential, contributing to a long-term positive feedback loop between lake nutrient cycling and climate change. Full article
(This article belongs to the Special Issue Microorganisms as Indicators of Environmental Changes)
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