The phosphorus load and the variation of the trophic states of Cirata Reservoir (West Java, Indonesia) from 1988 to 2017

Abstract

Abstract. Pratiwi NTM, Imran Z, Ayu IP, Iswantari A, Wulandari DY. 2020. The phosphorus load and the variation of the trophic states of Cirata Reservoir (West Java, Indonesia) from 1988 to 2017. Biodiversitas 21: 4176-4183. Cirata Reservoir was constructed in 1987 between Saguling and Jatiluhur Reservoirs; these are the three man-made cascading lakes in West Java, Indonesia. Cirata Reservoir has been used for floating cage aquaculture activities. The high organic content from the remains of the fish pellets raised the phosphorus (P) load, resulting in the eutrophication of the reservoirs. This research was aimed to assess the P load and the variation of the trophic states of the reservoir from year 1988 to 2017. The trophic states and the nutrients’ conditions of the water were determined using Myxophycean Index. Four groups of phytoplankton were found in the reservoir during observation: Cyanophyceae, Chlorophyceae, Bacillariophyceae, and Dinophyceae. In addition, one group was found in a smaller number of observations: Eugolenophyceae. Although the community structure of the phytoplankton has changed, the Cyanophyceae was always dominant in response against the condition of nutrients, especially P. The P load is closely related to the number of floating cages in the reservoir. This evidence showed that Cirata Reservoir tended to be relatively eutrophic. In general, despite that the P load tended to fluctuate, the trophic states of Cirata Reservoir remained dynamic in relatively high conditions; showed by the oligo-mesotrophic state during its first year of operation, then increased to eutrophic and hypertrophic by the next decade. Although the P load tended to decrease, it remains in the eutrophic condition in the recent time.

Short Communication: Assessing phytoplankton species structure in trophically different water bodies of South Ural, Russia

“…Microalgae are also very sensitive and respond quickly to decreased water quality caused by human activity (Setyono and Himawan 2018). Eutrophication, which influences aquatic biodiversity, affects many water bodies around the world and is considered a global issue (Ansari and Gill 2013;Ismest'eva et al 2015;Viaroli et al 2015;Gao et al 2020;Pratiwi et al 2020). Eutrophication leads to higher trophic states.…”

Diversitas Komunitas Fitoplankton Di Danau Hias Gold Coast, Pantai Indah Kapuk-Jakarta

“…Materi tersebut selanjutnya berpeluang memunculkan mutrien yang dibutuhkan fitoplankton sebagai produser primer di dalam perairan (Palleyl et al 2011, Irawati et al 2013. Perubahan konsentrasi maupun rasio nutrien dapat berpengaruh terhadap struktur komunitas fitoplankton (Pratiwi et al 2020). Struktur komunitas tersebut dapat dicerminkan melalui diversitas dalam komunitas fitoplankton (Wulandari et al 2014).…”

“…Kondisi tersebut dapat memicu terjadinya blooming fitoplankton (Rahman et al 2016). Di samping itu, perairan eutrof juga dapat dicirikan oleh munculnya kelompok fitoplankton tertentu yang menjadi penciri atau bioindikator kualitas perairan di dalam struktur komunitas fitoplankton (Pratiwi et al 2020). Struktur komunitas fitoplankton tersebut juga dipengaruhi oleh kondisi kualitas air yang dapat berubah secara temporal sehingga perlu dikaji.…”

“…Fitoplankton yang dijumpai lebih mencirikan jenis yang hidup di perairan tawar, yaitu Chlorophyceae, Bacillariophyceae, Cyanophyceae, dan Euglenophyceae (Pratiwi et al 2019;Pratiwi et al 2020). Hal ini dipengaruhi oleh nilai salinitas yang relatif rendah.…”

The Cost of Pollution to Dam’s Fisheries

“…This problem also happens to the terrestrial waters in many developing countries, including Indonesia. Cirata Dam experiences water quality degradation due to pollution [17,21,[30][31][32]. Fisheries in Cirata Dam is one of the resources of livelihood and food security of surrounding communities [5,16,17].…”