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Dede Irving Hartoto
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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PHYTOPLANKTON CHANGES IN SOME INLAND WATER HABITAT OF CENTRAL KALIMANTAN, INDONESIA Sulastri Sulastri; Dede Irving Hartoto
BERITA BIOLOGI Vol 5, No 3 (2000)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v5i3.1111

Abstract

The changes in the density, number of genera, diversity index of phytoplankton in some oxbow lakes (LakeRengas, Lutan,Takapan) and lowland lake (Lake Sembuluh) are described.Phytoplankton samples collected in rainy season, dry season (1995 to 1997) and in the forest fire period (October 1997).Before forest fire period, most of the time the density of phytoplankton was high (489 to 759 individuals/1) in January or rainy season especially in oxbow lake system. The high number of phytoplankton in rainy season is not common in the standing water in the floodplain system. This is probably because of the type of water that is acid water with the pH (4.43 to 4.66) in Lake Rengas, Lake Lutan (4.93 to 5.93) and Lake Takapan (4.03 to 4.64).In acid water oxbow lake, only some certain species occurred in the dry season. In January (rainy season),the inputs of water from main river increase the pH and presumably also nutrient, as shown by higher conductivity.In Lake Rengas, the highest density found in June that dominated by one genera (Oocystis).These facts probably because of phytoplankton input from the river Rungan that also show high density of the same species.It is also showed that the number the number of genera is also high in rainy season. Nonetheless of index diversity changes is not clear. In October 1997, when the forest fire period the density of phytoplankton and some genera as a group of Euglenophyceae increased.The highest density was found in Lake Sembuluh that range from 10,507 to 39,536 individuals/1.The phytoplankton density of Lake Rengas, Lutan and Takapan are 3,254, 1,414 and 9,019 respectively.The relationship of forest fire to the phytoplankton density is briefly discussed.
BEBERAPA ASPEK FEKUNDITAS IKAN-IKAN AIR TAWAR DI LUBUK LIMPAM SUMATERA SELATAN I. SUKU BAGRIDAE, KAN BERINGU MYSTUS NIGRICEPS C.V. DEDE IRVING HARTOTO
BERITA BIOLOGI Vol 2, No 8 (1984)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v2i8.1410

Abstract

Studi aspek-aspek fekunditas ikan penting dilakukan karena hasilnya dapat digunakan untuk berbagai hal, antara Iain untuk mengetahui musim pemijahan, ukuran ikan pada saat produktif sebagai penghasil keturunan dan sebagai data masukan dalam proses pemilihan bibit dalam praktek-praktek budidaya ikan. Kegunaan lainnya adalah sebagai data penunjang dalam studi dinamika populasiikan, terutama dalam studi laju peremajaan stok.Penelitian pada ikan-ikan Mystus telah dilakukan antara lain pada Mystus nemurus, M. seenghala, M. gulio, M. aor dan M. bleekeri. Aspek-aspek yang diteliti umumnya mencakup segi-segi budidaya, tingkah laku pemijahan, tingkah laku makan, makanan dan aspek fekunditasnya (Arsyad 1973; Madsuly 1977; Saigal 1964; Saigal & Motwani 1961 dan Pandian 1966).
METALS BIOCONCENTRATION OF FRESHWATER FISHES IN CENTRAL KALIMANTAN AS AN EVALUATION CRITERIA FOR MANAGEMENT OF INLAND WATER FISHERY RESERVE Dede Irving Hartoto; Awalina Awalina
BERITA BIOLOGI Vol 5, No 3 (2000)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v5i3.1113

Abstract

Heavy metal bioconcentration was examined and evaluated in the muscle of several of freshwater fishes species collected from a complex of some oxbow lakes in Kahayan River and from Lake Sembuluh, Central Kalimantan. The objective of the study was to find natural background values of heavy metals in water, sediment and its biomultiplication factor related to their concentration in water and the fish position in the foodweb. In this analysis,one to twenty-five grams of fish muscle samples was obtained from the posterior part of pectoral but anterior to anal fins. Water samples, which were taken from surface and bottom layers of the lakes, were mix and preserved with nitric acid. Sediment samples were obtained by using Ekman Grab and the interstitial waters were extracted by using wet digestion technique.Iron concentration in fish muscle is the highest in omnivorous, followed by that of in carnivorous and detritivorous fish. Manganese, lead and mercury had different pattern of bioconcentration levels. Bioaccumulation factor for each metal and at each food habit category was also variable; the lowest value of 0.7 for iron in second consumer and 28.2 for mercury in primary consumer. Mechanism of heavy metal intrusion to fish muscle is very intricate and apparently depends upon feeding habit of each species. Concentration of mercury in water and fish muscle was far above minimum risk level, but concentrations of iron, manganese and lead in water and fish was considered still safe for environment as well as for human health. Potential utilization of these results as evaluation criteria for fishery reserve is discussed.
Co-Authors Awalina Awalina Sulastri Sulastri