Table 6
Long-term changes of a species structure in the Harpacticoida and Ostracoda taxocenes of Bay Sivash during 2013–2018.
| Species | 20131 | 20151 | 2018 | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
|||||||
| FO, % | D, % | SD, % | FO, % | D, % | SD, % | FO, % | D, % | SD, % | |
| Class Hexanauplia | |||||||||
| Order Canuelloida | |||||||||
| Family Canuellidae | |||||||||
| Canuella perplexa (Scott T. et A., 1893) | 100 | 0 | 75 | 60 | 0 | 30 | 10 | 10 | 0 |
| Order Harpacticoida | |||||||||
| Family Ameiridae | |||||||||
| Ameira parvula (Claus, 1866) | 50 | 0 | 50 | 0 | 0 | 0 | +** | – | – |
| Cletocamptus retrogressus (Schmankevitsch, 1875) | 0 | 0 | 0 | 20 | 10 | 10 | 20 | 10 | 10 |
| Nitokra spinipes spinipes (Boeck, 1865) | 25 | 0 | 0 | 10 | 0 | 0 | 10 | 0 | 10 |
| Family Canthocamptidae | |||||||||
| Mesochra heldti (Monard, 1935) | 50 | 0 | 50 | 0 | 0 | 0 | 20 | 0 | 20 |
| Mesochra rostrata (Gurney, 1927) | 100 | 100 | 0 | 80 | 40 | 30 | 70 | 50 | 20 |
| Family Harpacticidae | |||||||||
| Harpacticus littoralis (Sars G.O., 1910) | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 10 | 0 |
| Harpacticus flexus (Brady et Robertson D., 1873) | 50 | 0 | 25 | 0 | 0 | 0 | +** | – | – |
| Family Laophontidae | |||||||||
| Laophonte setosa (Boeck, 1865) | 0 | 0 | 0 | 0 | 0 | 0 | 10*** | 0 | 10 |
| Family Metidae | |||||||||
| Metis ignea ignea (Philippi, 1843) | 0 | 0 | 0 | 20 | 0 | 10 | +* | – | – |
| Family Tachidiidae | |||||||||
| Microarthridion littorale (Poppe, 1881) | 0 | 0 | 0 | 40 | 10 | 10 | 0 | 0 | 0 |
| Number of species | 6 | 6 | 9(6****) | ||||||
| Class Ostracoda | |||||||||
| Order Podocopida | |||||||||
| Family Cytherideidae | |||||||||
| Cyprideis torosa (Jones, 1850) | +2 | No data | No data | ++ | ++ | – | 75 | 75 | – |
| Family Leptocytheridae | |||||||||
| Leptocythere devexa (Schornikov, 1966) | +2 | No data | No data | Empty shells | +** | ||||
| Family Loxoconchidae | |||||||||
| Loxoconcha bulgarica (Caraion, 1960) | +2 | No data | No data | + | + | + | 25 | 25 | |
| Loxoconcha aestuarii (Marinov, 1963) | – | – | – | + | – | – | 25*** | 25 | |
| Family Paradoxostomatidae | |||||||||
| Cytherois cepa (Klie, 1937) | – | – | – | + | + | + | – | – | – |
| Number of species | 3 | 4 | 4(3****) | ||||||
| Average salinity (range), g l−1 | 22(10–40) | 52(28–75) | 69(30–88) | ||||||
FO − frequency of occurrence; D − species was dominant; SD − species was subdominant; 1– data from Kolesnikova et al., 2017 and Drapun et al., 2017; 2–data for 2004; ** − found only in the plankton samples at salinity of 30 g l−1; * − found only in the plankton samples at salinity of 52 g l−1; *** − found only at salinity of 30 g l−1; **** − without species found only at salinity 30 g l−1.
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