DIATOM EPIPELIK SEBAGAI BIOINDIKATOR KUALITAS PERAIRAN DANAU RAWA PENING
ABSTRACT: Diatom is a
unicellular micro algae that had an important role in the food web and major
contributor of oxygen in the water. The short life cycle, rapid reproduction,
cosmopolite, wide spread distribution, variation in population, most are
sensitive to the environmental changes, easily handle samples and
identification, low cost of sampling and
data analysis may promote diatoms as a powerful bioindicator of water quality.
The unique siliceous frustules make diatoms able to preserve in the sediment.
Rawa Pening is a semi natural lake that administratively surrounded by
four districts that consist of 27 villages. The main problem of this lake is
erosion in the upstream and sedimentation in the downstream area as well as
uncontrolled of aquatic plant growth, particularly water hyacinth (Eichornia
crassipes) that induce lake shallowness. For people who live around Rawa
Pening, this lake had been used for agricultural irrigation, fisheries,
electricity power and tourism. To conserve the lake, as 3rd World Water Forum
in Tokyo, March 2003 and 2006 – 2009 National Research Agenda there is a need
of limnological research on the environmental changes. This research was
conducted in order to study the potential used of epipelic diatom as
bioindicator of lenthic ecosystem, particularly Rawa Pening Lake. Water and
sediment samples were taken from 27 sites from inlet, outlet and water body of
Rawa Pining Lake.
There were 254 diatom species that consist of 8 Centrophycidae species
and 246 Pennatophycidae species. The population varied between 6,989 and
3,781,000 individual/gram. Based on diversity indices of diatom, some part of
Rawapening Lake was unstable, whereas the others were stable based on the
diversity indices. Based on epipelic diatom, Rawa Pening Lake and its
catchments area might be divided into 3 groups: agricultural lotic ecosystem,
settlement lotic ecosystem and lenthic ecosystem. The high population of
Synedra ulna, Nitzschia palea and Aulacoseira indicated that the lake is
eutrophic that tent to be hypereutrophic. It was supported by high
concentration of total nitrogen and phosphorous. The concentration of heavy
metals Cadmium, Chromium, Copper and Lead were very high in sediment. However,
the government of Indonesia has not yet set up sediment quality criteria. The
following research would be proposed on this matter.
Penulis: Tri Retnaningsih
Soeprobowati, Jafron Wasiq Hidayat, Karyadi Baskoro
Kode Jurnal: jpmatematikadd110086

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