Long-tearm changes of Copepoda (Crustacea) abundance and biomass in the Danube and Odessa regions of the Black sea as indicator of water quality
Вантажиться...
Дата
2021
Науковий керівник
Укладач
Редактор
Назва журналу
Номер ISSN
Номер E-ISSN
Назва тому
Видавець
Анотація
Copepoda are the most important zooplanktonic group
constituting the primary food for fish larvae and some fishes. Copepoda
have the longest life cycles among the Black Sea mesozooplankton,
so their biomass and percentage of total zooplankton biomass is greatly
reduced by eutrophication. The percentage of Copepoda from the total
biomass of zooplankton is a reliable indicator of the ecological status of
the water bodies. For the Black Sea marine waters the indicator of “good”
ecological status (GES) is the average annual biomass of Copepoda, which
exceeds 45% of the total biomass of zooplankton. Changes of total biomass
of zooplankton, biomass of Copepoda, the abundance and biomass of
dominant species – Oithona davisae Ferrari F. D. & Orsi, 1984, Acartia
(Acartiura) clausi Giesbrecht, 1889 and A. (Acanthacartia) tonsa Dana,
1849 in the Danube and Odesa marine regions from 1970 to 2019 were
analysed. Also the ecological quality class in the Nort-Western part of Black
sea by Copepoda indicators from 2004 to 2017 were established according
to Water Framework Directive US. The total zooplankton biomass had been
decreasing in Ukrainian waters and % of Copepoda from total zooplankton
biomass was increasing. These tendencies shown a positive change in the
forage base of commercial planktophagous fishes and ecological class status
of the investigated aquatories. The abundance and biomass of O. davisae,
A. clausi and A. tonsa were decreased from 2016 to 2019. The highest
values of their metrics were in 2016 and the lowest rates observed in 2019.O. davisae, A. clausi and A. tonsa were the main components of copepods
number and biomass. The Acartia species formed higher part of Copepoda
biomass than O. davisae. The ecological state was “good” (GES) only in
Danube-Dnieper coastal waters and Danube delta in 2004–2017 where
Copepoda formed more than 45 % of total zooplankton biomass. In waters
of Northwester Black Sea bays, shallow and deepwater shelfs the ecological
state was “Bad” (notGES), the part of Copepoda was lower than 45 %.
Опис
Ключові слова
long-tearm changes, Copepoda (Crustacea) abundance, biomass, Danube, Odessa regions, Black sea
Бібліографічний опис
European vector of development of the modern scientific researches: collective monograph / edited by authors. – 2nd ed. – Riga, Latvia : “Baltija Publishing”, 2021.