Abstract
Beratan Lake is located in Bedugul, Candikuning Village, Baturiti Subdistrict, Tabanan District, Bali Province. Beratan Lake is a caldera lake with a surface area of 438 hectares, 1,340 hectares of water catchment areas, a length of 2 km and 2 km wide and 49.22 million m3 of water volume. This research was conducted in January until February 2016. The aims of this study are to phytoplankton community structure.The composition of phytoplankton were found during this study dominated by the phylum of Chlorophyta and species were often found with high abundance is Staurastrum tetracerum. Average abundance in the waters of Lake Beratan is in the range 2054-2502 ind/l which shows that the waters of Lake Beratan with moderate fertility (mesotrophic). The value of species diversity (H ') has ranges from 2,34 - 2,55. The range uniformity index values has from 0.76 - 0.83. Value index of phytoplankton dominance has range of 0,1- 0,16 dominance relatively low indicated the absence of certain species dominance.
Highlights
Beratan Lake is located in Bedugul
This research was conducted in January until February 2016
The aims of this study are to phytoplankton community structure
Summary
Dapat menyumbang masukan limbah (cair atau padat) baik secara langsung maupun tidak langsung dapat meningkatkan zat hara di suatu perairan terutama nitrat dan fosfat. Nitrat dan fosfat dalam keadaan normal merupakan nutrien utama bagi pertumbuhan fitoplankton.Ketersediaan unsur hara akan mempengaruhi berlangsungnya proses fotosintesis oleh fitoplankton. Fitoplankton merupakan komponen populasi pembentuk komunitas dari suatu ekosistem yang dapat digunakan sebagai indikator kualitas perairan meliputi produktivitas primer dan tingkat pencemaran (bioindikator) atau blooming spesies tertentu dari fitoplankton (Boyd.,1979). Status trofik berguna untuk memonitor kualitas air melalui pemahaman terhadap siklus nutrien dan interaksinya dengan jejaring makanan dalam suatu ekosistem (Dodds., 2007). Berdasarkan hal tersebut, untuk meningkatkan manajemen Danau Beratan menuju pembangunan yang berkelanjutan, maka perlu dilakukan penelitian yang ditinjau dari status tropik dan struktur komunitas fitoplankton di danau Beratan
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