The structure and composition of macrozoobenthos community in varying water qualities in Kalibaru Waters, Bengkulu, Indonesia

Abstract

Abstract. Lilisti, Zamdial, Hartono D, Brata B, Simarmata M. 2021. The structure and composition of macrozoobenthos community in varying water qualities in Kalibaru Waters, Bengkulu, Indonesia. Biodiversitas 22: 106-112. Various human activities affect the quality of the aquatic ecosystem that can be assessed by measuring the physical, chemical, and biological parameters of the waters and sediments. This is the case of Kalibaru Waters, Bengkulu, Indonesia which shows changes in the estuary and marine ecosystems due to the cut-off of the main river around the area for the development of roads and bridges. The objective of this study was to analyze the quality of the waters and substrate, and the structure of the macrozoobenthos community as a bioindicator at the Kalibaru Waters. A survey was carried out in four stations, which was purposively selected based on human activities around the waters. Data collected included the physical and chemical parameters, and the diversity and density of macrozoobenthos species. The density of macrozoobenthos species was analyzed for summed dominance ratio (SDR), diversity (H'), homogeneity (E), and dominance (D) indices. The results showed that the physical and chemical parameters of Kalibaru Waters were acceptable for aquatic life, however, the oil contents at two stations exceeded the ecological threshold. Analysis of the macrozoobenthos community as a bioindicator for water quality found that the diversity and homogeneity indices were at a medium level indicating an unstable community, while the dominant index remained low indicating that none of the species was dominant in the Kalibaru Waters. This information is needed as a reference for the government of Bengkulu Province to make appropriate policies and management decisions to maintain the quality of the aquatic ecosystem in Kalibaru Waters.

Community Structure of Macrozoobenthos from Upstream to Downstream of Purba District, North Sumatra

“…This study has several data limitations that require deeper investigation, including the substrate condition in each station i.e clay, sand, and silt [1]. Other studies also reported that the occurrence of benthic macrofauna was related to water velocity for species dwelling on the surface or with low mobility [12]. Therefore, further research on other taxa groups, such as plankton and fishes, is needed to increase the understanding of the habitat condition related to the anthropogenic effect on stream conditions in the Purba District.…”

Biodiversity and community assemblages of freshwater and marine macrozoobenthos in Gorontalo Waters, Indonesia

“…The taxa recorded during the research are 62, 9, and 7 genus for marine, estuary, and downstream sites, correspondingly; Gastropods are the most dominant class. This number is relatively high compared to Lilisti et al (2021) and Rimadiyani (2019) research results. Nevertheless, the number is smaller than previous studies outside Indonesia waters.…”

“…Echinoderms and Gastropods are the two major classes that make up the macrozoobenthos community in the coastal waters of Marsegu Island (Yunita et al 2018). In contrast, in Kalibaru Waters of Bengkulu, the dominant macrozoobenthos class is Pelecypoda (Lilisti et al 2021).…”