Структура та багаторічна динаміка таксоцену поліхет Одеського морського регіону (Чорне море)

Abstract

Вивчено видовий склад та кількісні показники поліхет макрозообентосу Одеського морського регіону північно-західної частини Чорного моря в 2005–2015 рр. Зареєстровано 23 види багатощетинкових червів, проаналізована варіабельність кількісних показників домінуючих видів: Alitta succinea, Prionospio cirrifera, Heteromastus filiformis, Melinna palmata.

Изучен видовой состав и количественные показатели полихет макрозообентоса Одесского морского региона северо-западной части Черного моря в 2005–2015 гг. Зарегистрировано 23 вида многощетинковых червей, проанализирована вариабельность количественных показателей доминирующих видов: Alitta succinea, Prionospio cirrifera, Heteromastus filiformis, Melinna palmata.

The species composition and quantitative indicators of polychaete of macrozoobenthos of Odessa Sea region of the north-western part of the Black Sea were investigated in 2005–2015. A total of 23 species of polychaete worms were registered. The number of recorded species in separate surveys ranged from 12 to 22 species. The most frequent species were Heteromastus filiformis 51.9–100.0 %), Melinna palmata (52,4–80,0 %), Alitta succinea (27.7–71.4) %, Polydora cornuta – (16.7–66.7 %), Harmothoe imbricata (37.0–80.0 %), Prionospio cirrifera (31.8–60.0 %), Nephtys hombergii (33.3–77.8 %). M. palmata (34.7 %), H. filiformis (25.7 %) and P. cirrifera (12.3 %) were numerically prevailed. M. palmata (57.4 %) was the absolute dominant in biomass. The total number of polychaetes varied from 20 to 9750 per square meter. The minimum biomass was 0.070 g∙m-2, the maximum – 87.150 g∙m-2. The variability of quantitative indicators of the dominant species was analyzed. Active development of A. succinea was recorded in 2010–2011, and the minimum abundance and biomass were recorded in 2015. The species develops mainly at a depth of up to 20 m, which was typical for him until the 1980s. The growth of H. filiformis biomass was observed in 2006, the highest abundance and biomass values were reached in the period of 2008–2010. H. filiformis developed at a depth of up to 20 m. A significant decrease in the quantitative indicators of M. palmata was registered in 2008–2010 and their renewal by 2015. Its abundance and biomass reached its maximum values at a depth of 15.1–20.0 m. P. cirrifera, which in 1998 was found by individual specimens, is massively developing in the modern period on shell rock and silty shell rock in biocenosis of M. galloprovincialis mainly at a depth of 10.1–15.0 m. It became a part of the dominant species.