Abstract
Estuary of Donan Riverwhich is adjacent to Segara Anakan Lagoon in Cilacap, Central Java Province (Indonesia) has been used for a number of activities such asfishieries, agriculture, industry, harbor, and tourism activities. The aim of this study is to analyze the ecosystem condition based on mazcrozoobenthos community structure. This study was conducted from Augustus 2015 to January 2016. Samples were collected monthly at five stations from the river close area to the ocean close area. The study was conducted to identify kinds of generaand densityof themacrozoobenthos, and analyze substrates and water quality.Data analysis was performed onabundance, diversity, evenness and dominance indexes.Based on the study, macrozoobenthos at the estuary of Donan River consists of three classes i.e Gastropod (12 genera), Bivalvia(9 genera), and Polychaeta (6 genera). Based on the sampling location, Gastropod and Bivalvia are the largest composition found at five stations. Based on the sampling location, the macrozoobenthos density, diversity index, evennes index,and dominance index can be inferred that the estuary of Donan River is classified to be moderately ecological polluted.
Highlights
Estuary of Donan River is located in Cilacap, Central Java Province, Indonesia, and it is directly adjacent to Segara Anakan Lagoon and connected with the Indian Ocean through Nusakambangan Strait
Composition of macrozoobenthos species found based on sampling station in estuary of Donan Riveris presented in Figure 3 and Appendix 1
This result is consistent with the study conducted by Hidayah (2003), which stated that the type of macrozoobenthos of Classes Gastropod and Bivalvia were most commonly found in estuary of Donan River
Summary
Estuary of Donan River is located in Cilacap, Central Java Province, Indonesia, and it is directly adjacent to Segara Anakan Lagoon and connected with the Indian Ocean through Nusakambangan Strait. The water flows of the river bring fresh water, lowering the salinity level in the estuary (Savenije, 2012). This will cause a fluctuation in salinity and will affect the unique community of aquatic organisms in the estuary (Rositasari and Rahayu, 1994). Some industries that are in the vicinity of the estuary include PT Pertamina RU IV Cilacap (oil refinery activities), and PT Holcim Tbk (holding the activities of cement production process, distribution of cement raw materials, and loading and unloading raw materials and coal mining).The existence of these activities is predicted to affect the water condition, that of estuary of Donan River. In addition to the water quality, this activity seems to affect organisms that live in the water
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