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All Journal LIMNOTEK - Perairan Darat Tropis di Indonesia Indonesian Journal of Limnology
Mey Ristanti Widoretno
Research Center For Limnology
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science

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POLA PEMANGSAAN FITOPLANKTON OLEH ZOOPLANKTON DAPHNIA MAGNA Chrismadha, Tjandra; Widoretno, Mey Ristanti
LIMNOTEK - Perairan Darat Tropis di Indonesia Vol 23, No 2 (2016)
Publisher : Research Center for Limnology

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Abstract

ABSTRAKPenelitian ini telah dilakukan untuk mengkaji hubungan trofik zooplankton-fitoplankton pada sekala laboratorium. Percobaan dilakukan di ruang laboratorium dengan atap polikarbonat semi-transparan, menggunakan 4 buah bak fiberglas konical volume 750 L  diisi air dipupuk masing-masing dengan pellet ikan untuk media tumbuh fitoplankton. Daphnia (Daphnia magna) masing-masing 20 ekor/L dimasukan kedalam 2 bak konikal, sementara 2 bak yang lainnya dibiarkan tanpa daphnia untuk kontrol pengamatan. Pengamatan dilakukan terhadap parameter komposisi jenis fitoplankton dan kandungan klorofil air medianya.Hasil percobaan ini memperlihatkan hubungan trofik, yaitu hubungan mangsa-pemangsa antara fitoplankton sebagai organisme produsen dan daphnia sebagai organisme konsumen tingkat pertama. Daphnia mempunyai 2 kriteria dalam memilih mangsanya, yaitu status taksa dan kesesuaian ukuran tubuhnya.Euglenophyta merupakan kelompok taksa fitoplankton yang pertama dimangsa oleh daphnia sebelum memilih kelompok taksa lainnya. Demikian juga daphnia lebih memilih jenis-jenis fitoplankton yang bersel tunggal dan berukuran relative kecil.
Physical-Chemical Characteristic and Trophic Status of Some Small Lakes in Ciliwung Watershed, West Java Indonesia Siti Aisyah; Sulastri Sulastri; Rahmi Dina; Mey Ristanti Widoretno
Indonesian Journal of Limnology Vol. 2 No. 2 (2021): Indonesian Journal of Limnology
Publisher : Indonesian Society of Limnology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (281.854 KB) | DOI: 10.51264/inajl.v2i2.15

Abstract

Small lakes are important freshwater resources to support the quality of human life. However, small lakes in the watershed are becoming threatened ecosystems because of increasing land-use changes and anthropogenic activity. The study aimed to determine characteristic physical-chemical parameters and trophic status some small lake in Ciliwung Watershed to support the sustainable management of small lakes in the Ciliwung watershed in preventing eutrophication effects.  The data was collected in April and June 2021. Measurement and analysis of water quality parameters were conducted by insitu and Laboratory. Some parameters were not in accordance with the Government Regulation number 22/2021 for class II water quality criteria (WQC), including TSS (>50 mg.L-1)., TP (>0.03 mg.L-1), COD (>25 mg.L-1) and DO (<3 mg.L-1), especially for Lake Sunter and Lake Cincin.There are two groups of lakes based on water quality and trophic status. Lake Telaga Warna Lake Cikaret, and Lake Cilodong were classified as eutrophic while lake Sunter and Lake Cincin were classified as hypereutrophic lake Lake Telaga Warna, Lake Cikaret, and Lake Cilodong, located at the upper and middle watershed, are eutrophic, characterized by deeper bottom and higher Secchi depth. At the lower watershed, Lake Sunter and Lake Cincin are hypereutrophic characterized by higher nutrients (TN and TP), COD, temperature, conductivity, salinity, and TDS. The downstream area was a densely populated area that contributed high pollution from upstream and middle of Ciliwung watershed.
Co-Authors Chrismadha, Tjandra Rahmi Dina Siti Aisyah Sulastri Sulastri