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All Journal JOURNAL OF COASTAL DEVELOPMENT BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Peter Gell
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Veterinary

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DIATOM STRATIGRAPHY OF MANGROVE ECOSYSTEMS ON THE NORTHERN COAST OF CENTRAL JAVA Tri Retnaningsih Soeprobowati; Sri Widodo Agung Suedy; Peter Gell
JOURNAL OF COASTAL DEVELOPMENT Vol 15, No 2 (2012): Volume 15, Number 2, Year 2012
Publisher : JOURNAL OF COASTAL DEVELOPMENT

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (302.4 KB)

Abstract

The natural mangrove ecosystems along the Northern Coast of Central Java were very limited in extent, even had replanted almost twenty years ago. Naturally, the upper layer of sediment are the latest deposition (superposition). Environmental condition recently are recorded in the top sediment layer, and can be used to reconstruct past condition  (the present is the key to the past). The potential use of diatoms to reconstruct palaeoecology is well established. Diatoms are microscopic algae that form siliceous frustules which make them well preserved in sediment. Diatoms and their assemblages are very useful as integrated indicators of environmental changes because their distribution is closely linked to water quality parameters as well as their affinities to several physical habitats. This research was conducted in order to determine the changes of mangrove ecosystem in the Northern Coast of Central Java based on diatom stratigraphy. Sediment samples from mangrove sites were taken from Pekalongan, Brebes, Semarang, Demak and Rembang. Diatom analysis, consist of digestion, preparation, and identification. The diatom stratigraphy was performed by Software of  C2 1.5.1. Stratigraphycally, the mangrove ecosystems along the Northern Coast of Central Java were previously more influenced by freshwater rather than the marine sources which dominate today.
The Minimum Number of Valves for Diatoms Identification in Rawapening Lake, Central Java Soeprobowati, Tri Retnaningsih; Tandjung, S. Djalal; Sutikno, Sutikno; Hadisusanto, Suwarno; Gell, Peter
BIOTROPIA Vol. 23 No. 2 (2016): BIOTROPIA Vol. 23 No. 2 December 2016
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4146.57 KB) | DOI: 10.11598/btb.2016.23.2.486

Abstract

Technical challenges in using diatoms for paleolimnological studies include the identification and enumeration of diatom valves. The minimum number of valves required for identification varies, ranging from 100 to 700 valves of the dominant species. This task can be very time-consuming, particularly when diatom valves are scarce. This study was conducted to determine the minimum number of valves needed for identification in diatom assemblages from Rawapening Lake, Central Java, Indonesia. Based on 314 samples collected from Rawapening Lake, diatom counting efficiency exceeded 0.85 when a minimum of 300 valves was counted. The number of diatom species identified remained stable after counting at least 300 valves. Therefore, the minimum number of diatom valves required to represent the assemblage for paleolimnological analysis is 300.
Co-Authors S. Djalal Tandjung Sri Widodo Agung Suedy Sutikno Sutikno SUWARNO HADISUSANTO Tri Retnaningsih Soeprobowati