Kazan State Medical University (Assistant Professor of the Department of Hygiene and Occupational Medicine)
Kaspian Marine Scientific Research Center (Leading Researcher of the Laboratory of Hydrometeorology and Climate)
Russian Federation
Russian Federation
Volga-Caspian branch of All-Russian Research Institute of Fisheries and Oceanography (Head of the Laboratory of Hydrobiology)
GRNTI 34.39 Физиология человека и животных
GRNTI 62.13 Биотехнологические процессы и аппараты
GRNTI 69.01 Общие вопросы рыбного хозяйства
GRNTI 69.25 Аквакультура. Рыбоводство
GRNTI 69.31 Промышленное рыболовство
GRNTI 69.51 Технология переработки сырья водного происхождения
GRNTI 87.19 Загрязнение и охрана вод суши, морей и океанов
Oxygen deficiency is caused by temperature and salinity stratification of water masses. Hypoxia was formed mainly on the border of the Northern Caspian - Middle Caspian, in shallow areas (up to 5 m depth), as well as in areas with fine-grained sediments. Representatives of annelid (Annelida) and round (Nemathelminthes) worms are characterized by high frequency. During the study period (2013-2017) the abundance and biomass of the study group varied widely. Oligochaeta was dominated by the total number, Hirudinea - by the total biomass. The maximum frequency was characteristic for polychaetes Hediste diversicolor . The dynamics of quantitative indicators of worms was inversely dependent on changes in the area of hypoxia: the expansion of the hypoxic area showed the decreased number of worms. The limits of tolerance to the oxygen content in individual species and classes of worms living in the north part of the Caspian Sea have been studied. The minimum concentration of oxygen recorded for the entire study period (1.29 ml/l; 21%) is found not critical for Hediste diversicolor and Hypaniola kowalewskii . The low concentration (1.76 ml/l; 31%) does not inhibit the development of Oligochaetas. The other representatives of Vermes group living in the western part of the Northern Caspian were found under the absolute oxygen content exceeding 4.06 ml/l and under the relative oxygen content exceeding 44%. A wide ecological valence for oxygen is characteristic for Hediste diversicolor , Hypaniola kowalewskii and Oligochaeta . Fabricia sabella , Caspiobdella tuberculosis and Archaeobdella esmonti demonstrate the narrow range of oxygen tolerance.
oxygen, hypoxia, annelid worms, roundworms, the Northern Caspian, ecological valence to oxygen
1. Arnol'di L. V. K voprosu o raspredelenii zoobentosa v Kaspiyskom more // Tr. po kompleksnomu izucheniyu Kaspiyskogo morya. M.; L.: Izd-vo AN SSSR, 1938. S. 115-171.
2. Saenkova A. K. Sezonnaya dinamika bentosa Severnogo Kaspiya // Tr. Kasp. nauch.-issled. in-ta mor. rybn. hoz-va i okeanografii. 1959. T. XV. S. 56-103.
3. Osadchih V. F. Biologicheskie i ekologicheskie osobennosti korofiid (Corophium latreille, 1806) Severnogo Kaspiya // Tr. KaspNIRHa. 1971. T. 26. S. 100-116.
4. Bondarenko M. V. Sostav i raspredelenie mizid Severnogo Kaspiya // Tr. VNIRO. 1978. T. SHHXII. S. 13-25.
5. Yablonskaya E. A. Mnogoletnie izmeneniya biomassy raznyh troficheskih grupp bentosa Severnogo Kaspiya // Tr. VNIRO. 1975. T. CVIII. S. 50-64.
6. Degtyareva L. V., Pis'mennaya O. A., Petrenko E. L. Vliyanie soderzhaniya organicheskogo ugleroda v donnyh otlozheniyah Cevernogo Kaspiya na chislennost' i biomassu zoobentosa // Vestn. Astrahan. gos. tehn. un-ta. Ser.: Rybnoe hozyaystvo. 2015. № 1. S. 37-46.
7. Vinogradov L. G. Predstoyaschie izmeneniya kaspiyskoy kormovoy fauny i neobhodimye mery po ee ukrepleniyu // Tr. VNIRO. 1959. T. 38. Vyp. 1. S. 165-175.
8. Katunin D. N. Gidroekologicheskie osnovy formirovaniya ekosistemnyh processov v Kaspiyskom more i del'te reki Volgi. Astrahan': Izd-vo KaspNIRH, 2014. 478 s.
9. Abdurahmanov G. M., Sokol'skaya E. A. Osnovnye ekologicheskie osobennosti bentosa Severnogo Kaspiya // Yug Rossii: ekologiya, razvitie. 2009. Vyp. 4. S. 65-68.
10. Konstantinov A. S. Obschaya gidrobiologiya: ucheb. dlya studentov biol. spec. vuzov. M.: Vyssh. shk., 1986. 472 s.
11. Katunin D. N., Kosarev A. N. Solenost' i biogennoe veschestvo v Severnom Kaspii // Vodnye resursy. 1981. Vyp. 1. S. 77-88.
12. Salmanov M. A. Ekologiya i biologicheskaya produktivnost' Kaspiyskogo morya. Baku: PIC Ismail, 1999. 398 s.
13. Kaspiyskoe more. Fauna i biologicheskaya produktivnost' / pod red. E. A. Yablonskoy. M.: Nauka, 1985. 276 s.
14. Ekologicheskie monitoringovye issledovaniya na licenzionnom uchastke «Severnyy» OOO «Lukoyl-Nizhnevolzhskneft'» (1997-2006 gg.) / pod red. G. A. Sudakova. Astrahan': Izd-vo KaspNIRH, 2007. 432 s.
15. Malinovskaya L. V. Mnogoletnyaya dinamika razvitiya mollyuskov Severnogo Kaspiya // Rybohozyaystvennaya nauka na Kaspii: zadachi i perspektivy: materialy Mezhdunar. konf., posvyasch. 40-letiyu GUDP «Dagestanskoe otdelenie KaspNIRH». Astrahan', 2003. S. 118-121.
16. Karpevich A. F., Osadchih V. F. Vliyanie solenosti, gazovogo rezhima vody i haraktera grunta na Nereis succinea // Materialy k poznaniyu fauny i flory, izdavaemye Moskovskim obschestvom ispytateley prirody. Sb. rabot ob akklimatizacii Nereis succinea v Kaspiyskom more. M.: Izd-vo Mosk. o-va ispytateley prirody, 1952. Vyp. 33. S. 352-365.
17. RD.52.10.736-2010. Ob'emnaya koncentraciya kisloroda v morskih vodah. Metodika izmereniy yodometricheskim metodom. M.: Izd-vo FGU «GOIN», 2010. 27 s.
18. Metodika izucheniya biogeocenozov vnutrennih vodoemov. M.: Nauka, 1975. 240 s.
19. Romanova N. N. Metodicheskie ukazaniya k izucheniyu bentosa yuzhnyh morey SSSR. M.: Izd-vo VNIRO, 1983. 14 s.
20. Atlas bespozvonochnyh Kaspiyskogo morya / pod red. Ya. A. Birshteyna. M.: Pisch. prom-t', 1968. 414 s.