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Research paper Botanica Pacifica. A journal of plant science and conservation 2023. Preprint Article first published online: 10 FEB 2023 | DOI: 10.17581/bp.2023.12111 Taxonomic diversity and structure of benthic diatom taxocenes (Bacillariophyta) along the Crimean Coast (the Black Sea) Elena L. Nevrova ![]() A.O. Kovalevsky Institute of Biology of the Southern Seas RAS, Sevastopol, Russia Diversity and structure of benthic diatom assemblages in 16 Crimean nearshore habitats with varying levels of technogenic bottom area pollution at depths range 0.5–50 m were investigated and accessed using Taxonomic Distinctness indices (TaxDI). In total 793 species and intraspecific taxa, belonging to 736 species, 130 genera, 53 families, 27 orders and 3 classes of Bacillariophyta were registered. The structure of diatom assemblages from polluted sites can be described as having low species richness and a large proportion of mono- and oligospecies branches at the family and order levels. In locations under a moderate anthropogenic impact, the structure was characterised by relatively high species richness and an equal ratio of oligo- and poly-species branches closed at genus level, with the presence of monospecies branches converging at family or order level. Taxocenes in pristine sites were distinguished by the highest species richness and a predominance of poly-species branches closed at different hierarchical levels. Неврова Е.Л. Таксономическое разнообразие и структура бентосных диатомовых таксоценов (Bacillariophyta) вдоль Крымского побережья (Чёрное море). Исследовано таксономическое разнообразие и структура бентосных диатомовых таксоценов в 16 прибрежных местооби- таниях Крыма с разной степенью техногенного загрязнения в диапазоне глубины 0.5–50 м. Для оценки иерархической структуры таксоценов диа- томовых исследованных районов использован индекс таксономической отличительности (TaxDI). Всего зарегистрировано 793 вида и внутривидовых таксона, относящихся к 736 видам, 130 родам, 53 семействам, 27 отрядам и 3 классам Bacillariophyta. Структура таксоценов диатомовых в загрязненных районах характеризуется низким видовым богатством и большой долей моно- и олиговидовых ветвей на уровне семейств и порядков. В акваториях с умеренным антропогенным воздействием структура таксоценов имеет относительно высокое видовое богатство и равное соотношение олиго- и поливидовых ветвей, замкнутых на уровне родов, с наличием моновидовых ветвей, конвергирующих на уровне семейств или порядков. Таксоцены в ненарушенных местообитаниях отличаются наибольшим видовым богатством и преобладанием поливидовых ветвей, сходящихся на различных уровнях иерархии. Keywords: hierarchical structure, taxonomic distinctness indices, technogenic pollution, иерархическая структура, индекс таксономической отличительности, техногенное загрязнение References Arvanitidis, C., G. Atzigeorgiu, D. Koutsoubas, T. 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