Species Composition Diversity of Bacillariophyta in Tributaries Dinh River, Quy Hop District, Nghe An Province
Main Article Content
Abstract
In this study, diatom species composition of Dinh River tributaries, Quy Hop district, Nghe An province was investigated in three surveys (April 2021, February 2022, and April 2022). A total of 40 diatom species and subspecies were identified, classified into 16 genera, 13 families, 3 suborders, 10 orders, 2 subclasses, 2 classes, and 2 subphyla. The class Bacillariophyceae was dominant, accounting for 38 taxa (95%), whereas Coscinodiscophyceae was represented by only 2 taxa (5%). The most species-rich genera were Iconella (7 taxa), Ulnaria (6), Cymbella (5), Pinnularia (4), and Navicula (3); additionally, 4 genera contained 2 taxa, and 7 genera contained a single taxon. Among the four surveyed sites, site 2 (Tran Khanh Quang) exhibited the highest species richness (33 taxa), while site 1 (Lang Con Branch, Nam Ton) had the lowest (15 taxa). Species diversity analysis using Sorensen and Beta diversity indices confirmed this pattern, with site 1 showing the lowest diversity (S = 0.50–0.56; ß = 2.08).
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