ТЕНДЕНЦІЇ ДОВГОТРИВАЛОЇ ЗМІНИ ЗАПАСІВ МАКРОФІТІВ В БУХТІ КОЗАЧА (СЕВАСТОПОЛЬ, КРИМ, ЧОРНЕ МОРЕ)

• Main Authors: Миронова, Н. В., Мильчакова, Н. П., Александров, В. В.
• Format: Article
• Language: Ukrainian
• Published: Marine Ecological Journal 2023
• Subjects: морські трави; агарофіти; запаси; б. Козача; Чорне море
• Online Access: https://mej.od.ua/index.php/mej/article/view/211

The state of macrophytes resources of the eastern inlet of Kazachya bay is estimated. The features of their depth distribution and inter-annual dynamics (1984 and 2007) are characterized. For more than 20 years the total resources of macrophytes almost doubled – from 173.8 to 304.6 tons. The stock of Zostera marina, Z. noltii and Ruppia spp. increased 3, 10 and 4 times respectively whereas one of Stuckenia pectinata decreased twofold. Although the vegetation of the bay is still dominated by seagrasses, the composition and structure of their communities have changed significantly. Similar changes have been identified for macroalgae resources, while the stock of agarophytes Gracilaria gracilis and G. dura decreased from 52.5 to 3.7 tons and from 4.5 to 0.9 tons, respectively, and one of Cystoseira barbata var. repens increased from 0.6 to 9.2 tons. The macrophytobenthos dynamics, resources and area occupied by seagrasses and macroalgae are probably connected to a change in local environmental conditions, including decrease in siltation of bottom sediments.