Epipelic Diatom Communities in Pengilon Lake Dieng, Central Java

Tri Retnaningsih Soeprobowati,Jumari Jumari,Fini Wulandari,Riche Hariyati,Hadiyanto Hadiyanto,Budi Warsito Budi Warsito,Maryono Maryono

doi:10.1051/e3sconf/201912501023

Abstract

Diatom communities in the lake have an advantage of environmental assessment and paleo reconstruction study, due to the ability of diatom preserved in the sediment. There are only limited studies about taxonomy, ecology, and diversity of diatom flora in tropical areas, especially Indonesia. The main objective of the research is to describe the structure of benthic diatom communities in Pengilon Lake, together with physical chemical variables. Sediment samples were collected at an altitude of more than 2,000 msal habitats with pH around 5.40-6.86. A total of 83 diatom species identified as belonging to 16 families. The diversity index ranges from about 2.25 to 3.01 indicated the ecosystem that naturally stable with none diatom dominant. The most abundant genera were Eunotia with high diversity around 14 taxa. The composition of Eunotia assemblages was different among habitat and season variation. Eunotia has a wide tolerance of pH because of its ability to survive in an area with an acidic environment and circumneutral water. The most dominance diatom species in Pengilon Lake were Eunotia paludosa (Grunow) 39.2%, Nitzschia frustulum (Kutzing) 28.1%, Pinnularia viridis (Krammer & Lange-Bertalot) and Pinnularia divergentissima (Grunow) 24.6%.

Highlights

Indonesia territory located in the equator area that receives a lot of sunlight concentration throughout the year, the presence of sunlight is used up to evaporating water from waterbodies
Pengilon Lake is a shallow permanent lake located in Dieng plateau, Wonosobo Indonesia
Sediment samples were collected on April 2019, the sample sites are located in location near Warna Lake (TP1) around the channel of Pengilon lake, TP2 represents the area near with agriculture, TP3 is located in the forest around lake that dominated with grass and TP4 is area with highest sediment deposition (Fig 1)

Summary

Introduction

Indonesia territory located in the equator area that receives a lot of sunlight concentration throughout the year, the presence of sunlight is used up to evaporating water from waterbodies. Tropical aquatic has constant temperature during the year, the temperature is considered an important role for determining the structural and temporal changes in diversity organism. There is various aquatic ecosystem around Dieng plateau one of them is Telaga Pengilon, the lake was formed by volcanic activity [4, 5]. Pengilon Lake is a shallow permanent lake located in Dieng plateau, Wonosobo Indonesia. Pengilon Lake is well known for its tourist attraction and potential as a water source for agricultural irrigation. To Pengilon Lake, there is Warna Lake, these habitats are characterized by different ecological conditions, which is specialized in pH fluctuation. The different ecological conditions affected the diatom assemblages around the lake. Diatom playing a fundamental part in lentic ecosystem for primary production, the food source for various aquatic organisms. Diatom is useful as an indicator to determine the water condition, the function of diatom as an indicator has been used since the 18th century [13]

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Conclusion