Plankton Community Structure and Biomass in the Eastern Middle Caspian Sea

Abstract

Despite the role of planktonic organisms in the fishery value of the Caspian Sea and in addition to the increase in the plankton population in the Caspian Sea, there are few detailed studies regarding the determination of the planktonic organisms in the Caspian Sea. In the present investigation, we aimed to study the cell abundance and diversity of the phyto- and zooplankton in the eastern part of the Middle Caspian Sea in the spring of 2016. The composition of phytoplankton consisted of 50 species belonging to 4 systematic groups which were registered in the eastern part of the Middle Caspian: Cyanophyta (7), Bacillariophyta (24), Dinoflagellata (13), and Chlorophyta (6). Zooplankton were represented by 9 taxa: Cladocera—6, Copepod—1, and other groups—2. The most important phytoplankton species were Rhizosolenia calcar-avis, Anabaena bergii, Exuviaella cordata, and Binuclearia lauterbornii. The 0–50 m layer in the eastern Middle Caspian was the most productive, where the biomass varied from 98 mg/m3 to 109 mg/m3, consisting largely of diatoms. The cladoceran Evadne anonyx typica, the copepod Acartia tonsa, and the larvae of barnacle crustaceans (Cirripedia) were widely distributed in this layer. Zooplankton abundance decreased markedly with the depth. The maximum zooplankton concentrations were confined to depths down to 200 m.

Perbandingan Kelimpahan Zooplankton Berdasarkan Mesh Size di Sekitar Areal Pertambakan Kecamatan Marana Kabupaten Maros

“…Kejadian ini menggambarkan bahwa ada hubungan ketergantungan yang sangat erat antara fitoplankton dan zooplankton (Tambaru et al, 2014;Hatta et al, 2022) yang memberikan dampak pada kelimpahan keduanya di perairan. Oleh karena itu perubahan yang terjadi pada suatu wilayah perairan dapat diketahui dengan melihat adanya perubahan pada kelimpahan zooplankton (Augusta, 2013;Yusanti, 2019;Kurochkina et al, 2023).…”

The Current State of Zooplankton Diversity in the Middle Caspian Sea during Spring

“…The basis of zooplankton quantitative variables was formed rotifers Brachionus quadridentatus, cladocerans Evadne anonyx, Podonevadne angusta, Podo vadne camptonyx, Podonevadne trigona, and copepods Acartia tonsa and Calanipeda aqued cis. In terms of abundance, the Shannon diversity index varied from 0.44 to 1.95 bits/i and from 0.51 bits/mg to 2.35 bits/mg [5,6].…”

“…Sturgeons of the Caspian Sea are benthivorous [2], with about 90% of the world's sturgeon catch currently being carried out in the Caspian Sea [3]. Furthermore, the Caspian Sea is a hotspot of biological diversity [3][4][5][6]. Biodiversity conservation is an important direction of life science, and its significance has formed the basis of many international documents, including the Convention on Biological Diversity [7].…”

“…In terms of abundance, the Shannon diversity index varied from 0.44 to 1.95 bits/ind. and from 0.51 bits/mg to 2.35 bits/mg [5,6].…”

Toxic phytoplankton in eutrophic regional seas: an overview

“…There is a recent paper on phytoplankton community structure on the eastern part of the Middle Caspian Sea (Kurochkina et al, 2023). The top layer (0-50m) was the most productive, biomass values ranging between 98 and 109 mg/m 3 .…”