Species Diversity of Epilithon Diatoms and the Quality of the Waters of the Donuzlav Gulf Ecosystem (Crimea, the Black Sea)

Abstract

In this work, the species diversity of epilithon diatoms of Donuzlav Gulf (Crimean coastal waters of the Black Sea) is presented for the first time. A total of 60 taxa of Bacillariophyta belonging to 3 classes, 18 families and 34 genera were found. The largest number of species (45) of diatoms was observed in summer, and the smallest number of species (12) in winter. A total of 25 saprobity indicator species of diatoms was found on the epilithon, 12 taxa of which belong to a group of betamesosaprobionts—indicators of moderate organic pollution of water. Marine species comprise 55% and brackish-marine ones make up 37% of them, but no freshwater species were identified. The diatom community was dominated by cosmopolites (32%) and arctic–boreal–tropical species (27%). The maximal abundance (186.2 × 103 cells cm−2) and biomass (0.083 mg cm−2) of diatoms was noted in June 2018 at salinity 16.58‰ and T = 24.4 °C with the dominant cosmopolites species of Licmophora abbreviata and Cocconeis scutellum. The minimum values, 14.8 × 103 cells cm−2 and 0.005 mg cm−2, were observed in January 2019 at salinity 16.86‰ and T = 9.0 °C with the dominant Berkeleya rutilans and Nitzschia hybrida f. hyalina. The high values of BOD5, oxidizability, silicon, Norg and Porg were noted, indicating a certain degree of water pollution by domestic sewage. It has been shown that the pollution in the southwestern part of the Donuzlav Gulf is greatest since this part of the coast was populated most densely in comparison with the northern coast of the Gulf where there are no coastal settlements except for two mariculture farms.

The unexpected diversity in Amphora sensu lato (Bacillariophyta) at Sozopol Bay, the western Black Sea

“…Stubs are stored at the BR-collection (Meise Botanic Garden, Belgium). For taxa identification and comparisons we consulted the following larger works: Proshkina-Lavrenko (1963), Guslyakov et al (1992), Witkowski et al (2000), Wachnicka & Gaiser (2007), Levkov (2009), Stepanek & Kociolek (2018), a large number of papers published in the last century (particular references given in taxa discussions), and works from the northern coasts of the sea, such as Guslyakov (1987), Nevrova (2013aNevrova ( , b, 2014aNevrova ( , b, 2015Nevrova ( a, b, 2016, Petrov & Nevrova (2013), Nevrova & Petrov (2019a, b), Ryabushko et al (2005Ryabushko et al ( , 2019, and others. In addition, all diatom taxon files, present in the digitalized collection of the Academy of Natural Sciences, Philadelphia (ANSP) (Potapova et al 2021), were also examined.…”

“…The species was reported from Crimea by Petrov & Nevrova (2013, as A. lineolata), but it is possible that some of the numerous records of Amphora arcus W.Gregory from the Black Sea (e.g. Nevrova 2013a, b, 2014a, b, 2015a, Nevrova & Petrov 2019a, Ryabushko et al 2019 represent the same taxon. Guslyakov et al (1992) transferred A. arcus to Cymbella C.Agardh, as C. arcus (W.Gregory) Guslyakov.…”

Диатомовые Водоросли Эпифитона Макрофитов Крымского Прибрежья Чёрного Моря

“…Выявлено 23 вида диатомовых водорослей -индикаторов органического загрязнения морских вод, из них группа β-мезосапробионтов занимает ведущее место (87%), характерная для умеренно загрязнённых вод, что типично для зал. Донузлав и акваторий крымского прибрежья Чёрного моря (Ryabushko et al, 2019). Основными доминантами, определяющими структуру диатомового сообщества в эпифитоне макрофитов, являются колониальные виды диатомовых водорослей (рис.…”

“…РЯБУШКО Л.И., ШИРОЯН А.Г., ЛИШАЕВ Д.Н. видов к солёности и сапробности воды, а также географии их распространения в Мировом океане (Рябушко, 2013;Ryabushko et al, 2018;Ryabushko et al, 2019).…”

Assessment of River-Sea Interaction in the Danube Nearshore Area (Ukraine) by Bioindicators and Statistical Mapping

“…Modern statistical programs and mapping have already been tested for many freshwater objects in different climatic zones [13][14][15][29][30][31]. However, applying these approaches to assessing the state of marine ecosystems has not yet received widespread use due to the limited number of indicator species [20,21,32]. The combined approach of studying the species composition of algae and statistics in the coastal area has good examples of its application [28].…”