Plankton Community Structure as Bioindicator Trophic Status of Jatigede Reservoir Waters

Abstract

Jatigede Reservoir in Sumedang Regency is a land mass planning designed as a multi-function reservoir. The main water source for this reservoir is from Cimanuk River, which flows through Garut Regency, and has many industrial activities around the river flow. This research was conducted to assess the trophic status of water pollution in Jatigede Reservoir by utilizing plankton as a bioindicator agent. Samples were collected from 9 observation stations from November 2018 until January 2019. The results showed that 26 species of phytoplankton from 7 divisions including Dinophyta, Cyanophyta, Chlorophyta, Chrysophyta, Euglenophyta, Bacillariophyta, and Charophyta was found in Jatigede Reservoir at about 461 ind/m3. Zooplankton abundance of 6 species from 2 divisions of Rotifera and Copepoda at 2 ind/m3. The average phytoplankton diversity index was 0.93 and zooplankton diversity index was 0.23. The average phytoplankton evenness index was 0.44 and zooplankton evenness index was 0.24. The average dominance of phytoplankton was 0.58 and dominance of zooplankton was 0.25. Based on the plankton community structure, the trophic status of Jatigede Reservoir was classified to moderate polluted (eutroph) to heavily pollutants (hypereutroph). The dominant species was Perinidium sp from Dinophyta division.

Plankton community structure and water conditions of Jatigede Reservoir for the sustainability of fisheries

“…The Phytoplankton diversity index ranged from 1.44 -2.15, the evenness index 0.13 -1.33 and dominance index 0.40 -0.60 [14]. In 2018 research by Rosadi [15] there were 26 species of phytoplankton with an abundance of 4,186 ind/l, diversity index ranged 0.53 -1.60, evenness index ranged 0.25 -0.71, and dominance index ranging from 0.27 -0.77. In 2019 there were 11 species of phytoplankton with an abundance of 111,106 ind/l with a diversity index 0.105 -2.010 and an evenness index ranged 0.20 -0.26 [16].…”

“…The zooplankton evenness index ranged from 0.40 -0.60 and the dominance index ranged from 0.30 -0.50 [14]. In 2018 the number of zooplankton species was 6 species with a total abundance of 21 ind/l and a diversity index ranging from 0.00 -0.76, evenness index 0.00 -0.82, and dominance index 0.00 -0.50 [15]. Research by Angkasa [21] related to zooplankton in the Jatigede Reservoir in 2019 showed that there were 23 types of zooplankton species with a total abundance of 11,146.…”

“…The fish restocking program does not only depend on demands from the community but also considers the kind of fish that can enrich and improve aquatic ecosystems. One of the goals of fish restocking is to maintain the stability of the ecosystem in the waters [15]. Looking at the water quality data, especially the high BOD and COD parameters, it is related that one of the problems in the Jatigede Reservoir is floating net cage fish aquaculture.…”

Comparative Study of Plankton Structure at Monoculture and Integrated Multi-Trophic Aquaculture (IMTA) Floating Net Cages at Coastal Area of Menjangan Besar, Karimunjawa Islands, Indonesia

“…The abundance of plankton supports the growth and development of fish biota in aquatic habitats. The presence of plankton in the waters is also influenced by water quality [6]. The abundance and diversity of plankton can be used as water indicators [7].…”