00616naa#a2200181#i#450# EN\\bibl\96613 20250420064409.7 2073-5529 20250325b2025####ek#y0engy0150####ca RU Long-term variability of quantitative indices of zooplankton in the western part of the Northern Caspian Journal article Astrakhan Astrakhan State Technical University 2025 5 с. Journal article local Планктон. 574.583 Mikhajlova Anna Viktorovna Nikulina Lyudmila Vitalevna vestnik.astu.org