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Yustiawati Yustiawati
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Status Pencemaran Situ Gunung Putri di Kabupaten Bogor Berdasarkan Metode STORET dan Indeks Pencemaran Mira Aristawidya; Zahidah Hasan; Iskandar Iskandar; Yustiawati Yustiawati; Heti Herawati
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 27 No. 1 (2020)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2020.13373

Abstract

Gunung Putri pond located in Bogor Regency functions as water reservoir, agricultural irrigation, fisheries activities, as well as domestic and industrial waste disposal sites. Human activities around the pond are thought to cause a decrease in the physical, chemical and biological qualities of the pond water. Therefore, research on the pollution status needs to be carried out for the management of pond water resources. The purpose of this study was to determine the status of Gunung Putri pond pollution as measured by the physical and chemical parameters of its waters. The study was conducted from February to March 2019. The methods used in determining the status of pollution were the STORET method and the Pollution Index (IP). The results of water quality measurements carried out in the field were compared with water quality standards, and were used in determining the status of pollution according to each method. Both methods produce different water quality status for each station, with the STORET method score ranging -20–0 and the Pollution Index score ranging 0.31–3.92. The STORET method more accurately explained the pollution conditions in Gunung Putri pond and showed that the water was in mild to moderate polluted conditions. Based on the two methods used, the highest pollution status was found at Stations 3 and 5. Organic material with high content was suspected as the cause of pollution because the most dominant water quality parameter in determining pollution status was COD. Therefore, Gunung Putri pond cannot support fishery activities because the water quality parameters of COD and DO at Stations 3 and 5 do not meet the water quality standards for the class II and III waters based on the Government Regulation No. 82 of 2001. Industrial, domestic, and agricultural wastes entering the waters of Gunung Putri pond contribute to the pollution of the aquatic environment which can be seen from the high COD value.
Struktur Komunitas Rotifera di Danau Hanjalutung, Palangka Raya, Provinsi Kalimantan Tengah Muhammad Badjoeri,; Yustiawati Yustiawati
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 28 No. 2 (2021)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2021.13389

Abstract

Community Structure of Rotifers in Lake Hanjalutung, Palangka Raya, Central Kalimantan Province. Lake Hanjalutung is an oxbow lake that located in the Rungan watershed in Palangka Raya, Central Kalimantan Province. This lake has potential fishery resources. Rotifers are zooplankton that plays an essential role in the food chain of the lake ecosystem. This study aims to reveal the composition and structure of the Rotifers community in Lake Hanjalutung. The research is expected to provide scientific information and limnological data on an oxbow lake that is useful for the future development and management of Lake Hanjalutung. The zooplankton samples were collected vertically from the bottom to the water surface using a zooplankton net in the rainy season (April) and dry season (October) in 2016 at six sampling points. The zooplankton was identified up to the genus level. Water quality parameters were measured by water quality checker Horiba U-53G. The community structure was analyzed by calculating the Shannon-Wiener diversity index (H'), the Simpson dominance index (D), and the Evenness index (E). The results found that the 15 genera of Rotifers were evenly distributed (E = 0.35–0.46), and no dominant species was found (D = 0.08–0.19) in either the rainy or dry season. The average density of Rotifers in the rainy season (33 individuals/L) was higher than in the dry season (18 individuals/L). The diversity index (H') ranged 2.02–2.59 (rainy season) and 1.73–2.36 (dry season). Thus, the community and species diversity of Rotifers in Lake Hanjalutung are in the moderate category. The water quality of the lake is entirely reasonable to support zooplankton life.