Limnological Review

4 pages, 179 KiB

Open AccessArticle

Light Pollution Affects the Coastal Zone of Lake Baikal

by Dmitry Karnaukhov, Maria Teplykh, Еkaterina Dolinskaya, Sofya Biritskaya, Yana Ermolaeva, Viktoria Pushnica, Iya Kuznetsova, Anastasia Okholina, Lidia Bukhaeva and Еugene Silow

Limnol. Rev. 2021, 21(3), 165-168; https://doi.org/10.2478/limre-2021-0015 - 22 Dec 2021

Cited by 3 | Viewed by 580

Abstract

The role of light pollution in aquatic ecosystems functioning has increased in recent times. In addition, the effect of such pollution has mostly been studied in coastal marine ecosystems, leaving freshwater ecosystems much less studied. In the p resent work, we investigated the effect of light pollution on the coastal zone of the ancient Lake Baikal ecosystem. Both a laboratory experiment and field research were conducted. The results of the experiment showed the presence of statistically significant differences (р = 0.009) between fish feeding on amphipods with and without daylight conditions, while there were no such differences between daylight and artificial light conditions. At the same time, video recordings revealed both a low number of specimens and a low species diversity of amphipods near to the village with a developed system of street lights, while in the village with a nearly nonexistent light system, the species diversity and a number of amphipods were much higher. One plausible explanation for such influence of light pollution on the quality and quantity of Baikal amphipod fauna might be the sum of several factors such as high water transparency and daily vertical migrations of amphipods. Full article

10 pages, 424 KiB

Open AccessArticle

Current State of Bacterial Community of Lake Ladoga

by Larisa L. Kapustina and Galina G. Mitrukova

Limnol. Rev. 2021, 21(3), 155-164; https://doi.org/10.2478/limre-2021-0014 - 22 Dec 2021

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Abstract

The data are presented on a quantitative assessment of the bacterioplankton community of Lake Ladoga and total bacterial numbers dynamic in the period from 2009 to 2019. The trophic state of the lake and water quality in different areas have been characterized by microbiological parameters. Maximum concentrations of microorganisms and highest water temperatures were commonly observed in the shallow coastal area (Volkhov Bay, up to 6.40 × 10⁶ cells ml⁻¹), and minimum—in the deepest part of the lake (ca. 0.45 × 10⁶ cells cm⁻³). The bacterial abundances correlate with water temperatures both within each year of observations and over the whole study period. The trophic state of the lake expressed by the total bacterial numbers during summer seasons closely matches the state during the first decade of the 21st century. In the period of 2009-2019, the trophic state varied from oligo-mesotrophic in the hypolimnion of deep-water areas to mesotrophic eutrophic in the shallow southern coastal area, which corresponds to the trophic state indicated by chlorophyll-a concentrations. Within the previous decade (2000–2008), the waters of Lake Ladoga were “clean” and “especially clean”, while during the 2017–2019 period, water masses all over the lake can be identified as “especially clean”. From 2017 to 2019 the coccoid forms of bacterial cells prevailed over rod-shaped cells comprising 57.6 ± 5.1% (2017), 64.4 ± 4.5% (2018), 61.1 ± 4.6% (2019), which imply the high quality of the waters. Full article

8 pages, 1307 KiB

Open AccessArticle

Aquatic Tardigrades in Poland—A review

by Pushpalata Kayastha, Joanna Wiśniewska, Klaudia Kuzdrowska and Łukasz Kaczmarek

Limnol. Rev. 2021, 21(3), 147-154; https://doi.org/10.2478/limre-2021-0013 - 22 Dec 2021

Cited by 2 | Viewed by 536

Abstract

The diversity, distribution and ecology of aquatic Tardigrada in Poland remain poorly known. We reviewed the literature focused on tardigrades in Poland and recognized only 15 aquatic taxa which were reported from various freshwater and marine habitats. Among them, 12 are freshwater and three are marine taxa. Hypsibius dujardini is Poland’s most widely-distributed hygrophilous species, but it re presents rather a complex of cryptic species and their diagnosis requires integrative approaches. Most reports of aquatic tardigrades in Poland are accidental findings mostly from water bodies in Tatra Mountains or from lakes in Masurian Lake District. Some species were also reported from small ponds or wastewater treatment plants in other regions like Małopolska or Wielkopolska Provinces. Full article

20 pages, 855 KiB

Open AccessArticle

The Tardigrade Cuticle

by Michaela Czerneková and Stanislav Vinopal

Limnol. Rev. 2021, 21(3), 127-146; https://doi.org/10.2478/limre-2021-0012 - 22 Dec 2021

Cited by 10 | Viewed by 829

Abstract

Tardigrades (phylum Tardigrada) are aquatic microecdysozoans that have adapted to survive extreme conditions through the formation of cysts or ametabolic tuns. Their body is covered by a cuticle that plays an important role in their life cycle, including their response and adaptation to environmental challenges. Cuticular characteristics are a critical component of tardigrade taxonomy. Therefore, research has often been focused on the relationship between cuticular morphology and ultrastructure and the evolutionary and phylogenetic positioning of the phylum and individual species herein. However, a deeper insight into the ultrastructural characteristics and chemical composition of the tardigrade cuticle is needed. This knowledge is important not only for a better understanding of tardigrade physiology and ecology but also for the development of efficient microinjection and/or electroporation techniques that would allow for genetic manipulation, opening new avenues in tardigrade research. Here, we review data on cuticle ultrastructure and chemical composition. Further, we discuss how the cuticle is affected during moulting, encystment, cyclomorphosis, and anhydrobiosis. Our work indicates that more systematic studies on the molecular composition of the tardigrade cuticle and on the process of its formation are needed to improve our understanding of its properties and functions. Full article

8 pages, 842 KiB

Open AccessArticle

Hydrological Modeling of Rainfall-Runoff of the Semi-Arid Aguibat Ezziar Watershed Through the GR4J Model

by Fatima-Zehrae Elhallaoui Oueldkaddour, Fatima Wariaghli, Hassane Brirhet and Ahmed Yahyaoui

Limnol. Rev. 2021, 21(3), 119-126; https://doi.org/10.2478/limre-2021-0011 - 22 Dec 2021

Viewed by 506

Abstract

The management of water resources requires as a first step the modeling of rainfall-runoff. It allows simulating the hydrological behavior of the basin for a good evaluation of the potentiality of this in terms of water production. There are different hydrological models used for water resource assessment, but conceptual models are still the most used due to their simple structure and satisfactory performance. In this study, t he performances of the conceptual model of rainfall and runoff (GR4J) modeled under R with the AirGR package, are used to Aguibat Ezziar the subbasin of the Bouregreg basin in Morocco. The enormous amount of data required and the uncertainty of some of the m makes these models of limited usefulness. The GR4J model allows evaluation of the runoff rates and describes the hydrological behavior of the Aguibat Ezziar watershed, which presents the aim behind writing this paper. A period from 2003 to 2017 has been selected. This period has been divided into two parts: one for calibration (2003–2006), and one for validation (2013–2016). After the calibration of the model and following the performance obtained (Nash higher than 0.72) we can say that the GR4J model behaves well in the Aguibat Ezziar catchment area. Full article

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Limnol. Rev., Volume 21, Issue 3 (September 2021) – 5 articles , Pages 119-168

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