Open AccessThe Structure of Plankton as An Environmental Indicator for Water Management in Upper Part of Rawapening Lake, Semarang Regency, Indonesia
Author(s) -
Jafron Wasiq Hidayat,
Rini Budi Hastuti,
Mochamad Hadi,
Gatot Yulianto
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1217/1/012168
Subject(s) - plankton , water quality , eutrophication , zooplankton , environmental science , abundance (ecology) , trophic level , biodiversity , ecology , fishery , species evenness , species diversity , nutrient , biology
The quality of Rawapening waters is constantly changing over time. The bloom growth of water hyacinth, fishery aquaculture activities and environmental pressures are getting heavier as expressed as eutrophication. This will affect in plankton composition. Plankton can provide an indication of changes and environmental quality, especially of its biotic structure and biodiversity. The upper part of Rawapening lake, similar to other part of the lake, is enriched with semi and aquatic plant. The purpose of this research is to analyze the condition of plankton currently, so that it can understand the change of water quality to support lake and fishery managements. The study was conducted in June 2018 on the upper parts of Rawapening Lake, particularly the southern side where many spring waters appear. Plankton collection was done by sampling using plankton net no 25. Data analysis was conducted descriptively and semi-quantitative using community structure including diversity, evenness and domination indices. The results showed that common plankton species found were Melosira sp, Synedra sp and Chlorella sp. Aulacosiera sp is quite abundant in all five stations reaching a range of 34-153 individuals / lt. In term of ecosystem stability, the waters are qualified as small to moderate stability conditions (H index :1.04 - 2.18) The species abundance tend to be small, especially in the spring station, which is associated with low water nutrients from springs. Aulacosiera sp is still dominate the plankton component for some station. The species which previously experienced a high domination, especially the Aulacoseir a spp, change into a minority. This condition is mainly related to the changing physical condition of environmental. This, at a glance shows that the former water source area is still in good quality at this time experiencing enrichment. This is related to the increasing fishery practices of floating cage net of cultivation area approaching the spring water areas. The limitation and regulation in this area are urgently implemented and enforced, because clean water supply is important for the supply and circulation, which is not only for culture practice but also the lake in general.