Definition of the potential recruitment of mussel, mitilaster and anadara settlements in the coastal waters of the Black and Adriatic seas by experimental substrates

I.I. Kazankova

Institute of Natural and Technical Systems, Russian Federation, Sevastopol, Lenin Street, 28

Email: ikazani@bk.ru

DOI: 10.33075/2220-5861-2019-3-112-119

UDC 574.34: 57.045

 Abstract:

   The results of measurements of potential recruitment of Bivalvia – mussel Mytilus galloprovincialis Lamarck, 1819, mytilaster Mytilaster lineatus (Gmelin, 1791), as well as the recent invader anadara Anadara kagoshimensis (Tokunaga, 1906) in coastal waters of the Black and Adriatic Seas in various perennial periods starting from the middle of the 20th century are considered in this article.

   The potential recruitment of mollusks (i.e., the number of post-larvae that appeared on the experimental substrates per unit of time – optimally, per month) was determined using two types of experimental substrates: glass plates with a smooth surface and substrates formed from acrylic yarn with thin filaments.

   According to the results of the experiments with simultaneous exposure of two types of substrates, transient coefficients were obtained, showing how many times the parameter under study increased when using acrylic substrates, as compared to glass plates. The number of post-larvae of mollusks in the period of their mass settling was higher on acrylic substrates than on glass plates: mussel – several times (8 times), anadarа and mytilaster – one or two orders of magnitude (28 and 170 times, respectively).

   The application of the transient coefficient made it possible to determine that the maximum values of the potential mussel recruitment in winter-spring seasons of the 21st century decreased in the Sevastopol region as compared to those of the second half of the 20th century.

   The highest values ​​of the potential recruitment of the studied mollusks in the seasons of mass settling were characteristic of mytilaster, the lowest – for anadara.

Keywords: larvae, post-larvae, glass plates and substrates with filaments structures.

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