THE INTER-ANNUAL CHANGES OF THE QUANTITATIVE AND BIOMASS INDICES OF MUSSELS MYTILUS GALLOPROVINCIALIS Lam. AND MYTILASTERS MYTILASTER LINEATUS Gmel. IN THE PERIPHYTON SETTLEMENTS NEAR ODESA COAST OF THE BLACK SEA
Journal Title: Вісник Одеського національного університету. Біологія - Year 2016, Vol 21, Issue 1
Abstract
The inter-annual dynamics of the abundance and the biomass of mussels Mytilus galloprovincialis (Lamarck, 1819) and mytilasters Mytilaster lineatus (Gmelin, 1791) in the periphyton settlements on the concrete traverses in four coastal beach areas of the Odessa Bay (North-western Black Sea, Ukraine), for the period 2006–2015 was presented. The selected marine areas were located near Lanzheron Cape (46°28.511’ N, 30°45.959’ E – 46°28.091’ N, 30°45.828’ E) and differed in their hydrological conditions due to varying degrees of isolation from the open sea by the concrete coast-protecting engineering structures (breakwaters and up-water traverses). In the mollusks settlements the number and the biomass of animals, their share in the total mass of fouling, the weight of individuals and the length of its shells were studied. In the mussel colonies the distribution of the mollusks by different size groups (up to 70 mm inclusive) was also analyzed. The observations showed significant inter-annual changes in the quantitative and mass indices of mollusks in the periphyton settlements from the investigated area. The number of mussels in fouling on the concrete traverses ranged from 0.927±0.335 to 3.877±0.675 thousand. ind. • m -2 (in 2011 and 2008 respectively) and the number of mytilasters varied from 1.355±0.322 to 4.710±0.953 thousand ind. • m -2 (in 2009 and 2011). During the period of 2006–2015, the mass of mussels varied from 0.849±0.338 to 7.053±0.721 kg • m-2, and the mass of mytilasters – from 0.201±0.074 to 0.531±0.132 kg • m-2 (the share in the total mass of fouling is 32.07–81.43 % and 3.58–28.16 % respectively). Basing on the long period of observations, we concluded that in shallow coastal marine areas, which are marked by slow water exchange with the open sea due to the large isolation by coast-protecting structures, the quantitative and biomass indices of mussels and mytilasters in periphyton settlements showed significant instability. The dynamics of these indices depended on various hydrological and climatic conditions, one of the factors affecting the success or degradation of mollusks settlements may be abnormally high temperature of the seawater environment during the summer months. The negative impact of prolonged period of water high temperature may laed to mass mortality of mussels and reduce its density in fouling (which was recorded in the summer of 2010), decreasing the biological potential of the periphyton settlements in this region of the Black Sea.
Authors and Affiliations
I. A. Hovorin, Ye. I. Shchatsylo
Keywords
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