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Table 4
Long-term changes in taxocene structure of Nematoda on soft bottom sediments of Bay Sivash (2013–2018).
| Species | 2013* | 2015* | 2018 | ||||||
|---|---|---|---|---|---|---|---|---|---|
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|
|
|
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| FO, % | D, % | SD, % | FO, % | D, % | SD, % | FO, % | D, % | SD, % | |
| Class Chromadorea | |||||||||
| Order Araeolaimida | |||||||||
| Family Axonolaimidae | |||||||||
| Ascolaimus elegans (Hendelberg & Jensen, 1993) | 12.5 | 0 | 0 | 50 | 0 | 25 | – | – | – |
| Family Diplopeltidae | |||||||||
| Araeolaimus ponticus (Filipjev, 1922) | 12.5 | – | – | 25 | – | – | – | – | – |
| Family Comesomatidae | |||||||||
| Sabatieria pulchra (Schneider, 1906) | 50 | 0 | 0 | 100 | 12.5 | 0 | – | – | – |
| Order Chromadorida | |||||||||
| Chromadorida gen. sp. | 12.5 | – | – | – | – | – | – | – | – |
| Family Chromadoridae | |||||||||
| Chromadora nudicapitata (Bastian, 1865) | 25 | 0 | 12.5 | – | – | – | – | – | – |
| Chromadorita cf. leuckarti (de Man,1876) (Filipjev, 1929) | 12.5 | 0 | 0 | – | – | – | – | – | – |
| Spilophorella campbelli (Allgén, 1928) | – | – | – | 75 | 0 | 0 | 12.5** | 0 | 0 |
| Neochromadora poecilosomoides (Filipjev, 1918) | 12.5 | 0 | 12.5 | – | – | – | 12.5** | 0 | 12.5 |
| Family Ethmolaimidae | |||||||||
| Ethmolaimus multipapillatus (Paramonov, 1926) | 12.5 | 0 | 12.5 | – | – | – | 50 | 0 | 12.5 |
| Order Rhabditida | |||||||||
| Family Rhabditidae | |||||||||
| Rhabditis? sp. | – | – | – | – | – | – | 12.5 | 0 | 0 |
| Order Desmodorida | |||||||||
| Family Desmodoridae | |||||||||
| Chromaspirina sp. | 12.5 | – | – | 50 | 0 | 0 | – | – | – |
| Cyatholaimus gracilis (Eberth, 1863) (Bastian, 1865) | 12.5 | 12.5 | 0 | – | – | – | – | – | – |
| Molgolaimus sp. | 12.5 | 0 | 0 | – | – | – | – | – | – |
| Order Monhysterida | |||||||||
| Family Linhomoeidae | |||||||||
| Linhomoeidae gen. sp. | – | – | – | 25 | – | – | – | – | – |
| Terschellingia longicaudatade (Man, 1907) | 12.5 | 0 | 0 | 75 | 0 | 0 | 12.5 | 0 | 0 |
| T. cf. antonovi (Filipjev, 1922) | 37.5 | 0 | 0 | 100 | 75 | 0 | 12.5 | 0 | 0 |
| T. cf. pontica (Filipjev, 1918) | – | – | – | 25 | 0 | 0 | 25 | 12.5 | 0 |
| Family Xyalidae | |||||||||
| Cobbia sp. | 12.5 | 0 | 0 | – | – | – | – | – | – |
| Daptonema maeoticum (Filipjev, 1922) | 12.5 | – | – | – | – | – | 12.5** | 0 | 12.5 |
| D. setosus (Bütschli, 1874) | 12.5 | – | – | – | – | – | – | – | – |
| D. longicaudatum (Filipjev 1922) (Lorenzen, 1977) | 12.5 | – | – | – | – | – | – | – | – |
| Theristus sp. | 12.5 | 0 | 12.5 | 25 | 0 | 0 | 37.5 | 0 | 12.5 |
| Th. cf. latissimus (Filipjev, 1922) | 12.5 | 12.5 | 0 | – | – | – | – | – | – |
| Th. littoralis Filipjev, 1922 | 25 | 12.5 | 12.5 | – | – | – | 25 | 12.5 | 0 |
| Th. sabulicola (Filipjev, 1918) (Wieser, 1956) | 12.5 | 0 | 0 | – | – | – | – | – | – |
| Family Monhysteridae | |||||||||
| Monhystera sp. | 37.5 | 12.5 | 0 | 50 | 0 | 0 | – | – | – |
| Eumonhystera filiformis (Bastian, 1865) | 12.5 | 0 | 0 | – | – | – | 37.5 | 0 | 12.5 |
| Gammarine maampullocauda (Paramonov, 1926) | 12.5 | 0 | 0 | – | – | – | – | – | – |
| Thalassomonhystera attenuate (Filipjev, 1922) | – | – | – | – | – | – | 12.5** | 0 | 0 |
| Th. parva (Bastian, 1865) | – | – | – | – | – | – | 37.5 | 37.5 | 0 |
| Family Sphaerolaimidae | |||||||||
| Sphaerolaimus sp. | 12.5 | 0 | 0 | – | – | – | – | – | – |
| Sph. gracilis (deMan, 1876) | – | – | – | 25 | 0 | 25 | – | – | – |
| Sph. macrocirculus (Filipjev, 1918) | – | – | – | 50 | 0 | 0 | – | – | – |
| Sph. ostreae (Filipjev, 1918) | – | – | – | 25 | 0 | 25 | – | – | – |
| Class Enoplea | |||||||||
| OrderEnoplida | |||||||||
| Family Tripyloididae | |||||||||
| Bathylaimus australis (Cobb, 1894) | – | – | – | 25 | – | – | – | – | – |
| Family Oncholaimidae | |||||||||
| Viscosia sp. | – | – | – | 100 | 0 | 25 | – | – | – |
| V. cf. cobbi (Filipjev, 1918) | 12.5 | 0 | 12.5 | 25 | 0 | 0 | – | – | – |
| V. glabra (Bastian, 1865) (de Man, 1890) | 12.5 | 0 | 0 | – | – | – | – | – | – |
| V. minor (Filipjev, 1918) | – | – | – | 25 | 0 | 0 | – | – | – |
| Family Enchelidiidae | |||||||||
| Catalaimus sp. | – | – | – | 25 | 0 | 0 | – | – | – |
| Family Enoplidae | |||||||||
| Enoplus littoralis (Filipjev, 1918) | 12.5 | 0 | 12.5 | – | – | – | – | – | – |
| Family Oncholaimidae | |||||||||
| Oncholaimellus mediterraneus (Sch.-Stekh, 1942) | – | – | – | 75 | 0 | 25 | – | – | – |
| Oncholaimus brevicaudatus (Filipjev, 1918) | 25 | 0 | 0 | – | – | – | 37.5 | 0 | 12.5 |
| O. campylocercoides (De Coninck & Sch.-Stekh. 1933) | – | – | – | 50 | 0 | 0 | – | – | – |
| Metoncholaimus demani (ZurStrassen, 1894) | 12.5 | 0 | 0 | – | – | – | 12.5** | 12.5 | 0 |
| Family Thoracostomopsidae | |||||||||
| Mesacanthion conicum (Filipjev 1918) | 12.5 | – | – | – | – | – | – | – | – |
| Order Dorylaimida | |||||||||
| Family Qudsianematidae | |||||||||
| Eudorylaimus sp. | – | – | – | – | – | – | 12.5 | 0 | 0 |
| Total number of species and forms | 30 | 22 | 16 (11***) | ||||||
| Average number of species in a sample | 5 | 10 | 4 | ||||||
| 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; * − data from Sergeeva et al. (2019); ** − species found only at salinity of 30 g l−1; *** − the number of the species without samples taken at salinity of 30 g l−1.
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