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Epipelic Diatoms to Determine Ecological Status Based on Diatom Index in Mangrove Ecosystem of Morosari Village, Indonesia

Hasrini Dian Aghnaita, Soeprobowati Tri Retnaningsih, Jumari Jumari

Journal of Ecological Engineering

2023

Vol. 24, nr 11

30--43

The mangrove ecosystem of Morosari Village, located in Sayung District, Demak Regency, Central Java, Indonesia, frequent experienced water pollution problems such as tidal flooding, abrasion and pollution due to anthropogenic activities. These problems can lead to further deterioration of water quality. This study aims to use epipelic diatoms to determine the ecological status of waters based on the diatom index in the coastal waters of Morosari Village, Central Java, Indonesia. Sampling was conducted at 3 sampling locations in July-December 2022. Samples from three stations were analyzed based on the diatom index using OMNIDIA software version 6.1.5 and RStudio Software for water quality. Four diatom water quality indices (IBD, IPS, IDG, and TDI index) were obtained percentage value of more than 70% of diatom species. The results of the analysis showed varied ecological status and water quality. Station 1 ranges from 10.9 to 5.2 which is categorized meso-eutrophic to eutrophic in terms of diatom species that dominate Fallacia pygmaea and Nitzschia clausii, Station 2 ranges from 14.3 to 6.9 which is categorized mesotrophic to eutrophic in terms of species Diatoma vulgaris and Thalassiosira pseudonana, and Station 3 ranges from 13.9 to 3.5 with diatom species dominating Cocconeis placentula and Nitzschia palea.

Relationships between epipelic diatoms, aquatic macrophytes, and water quality in Akarçay Stream, Afyonkarahisar, Turkey

Kargioglu M., Serteser A., Kivrak E., Içaga Y., Konuk M.

Oceanological and Hydrobiological Studies

2012

Vol. 41, No. 1

74-84

The Akarçay is the most important stream in the Afyonkarahisar region in central Turkey. In this study, the relationships between epipelic diatoms, macrophytes, and the water quality of Akarçay Stream are presented. According to Canonical Correspondence Analysis (CCA), BOD5, COD, TDS, NH4-N, NO2-N, and PO4-P had the most significant effects on the diatom and macrophyte community structures of the stream. According to CCA and Correspondence Analysis (CA), dominant diatom species and macrophytes constituted two groups, eutrophic and polluted. While eutraphentic taxa were abundant among upstream diatoms, hypereutraphentic taxa were found downstream in the Akarçay. The diatom assemblages in the sites upstream were generally characterized by an abundance of ß-mesosaprobous and .-mesosaprobous species, while the diatom assemblages downstream had a very high abundance of polisaprobous species. Eutrophic and hypertrophic macrophyte taxa (such as Lemna trisulca, Potamogeton nodosus, and Ranunculus sp.) covered a high percentage of the stream bottom. Both diatom indices and macrophyte indices with the exception of the Biological Macrophyte Index of Rivers (IBMR) were correlated with BOD5, COD, TDS, NH4-N, NO2-N, PO4-P, and EC. Physicochemical variables, diatom and macrophyte taxa and the results of diatom and macrophyte indices indicated that the Akarçay stream basin is eutrophic and organically polluted.