Aini Chairunnisa Amalia. K2D 001 234. Compotition and Community Structure of Periphyton at Rhizophora mucronata Lamk dan Avicennia marina (Forsk) Vierh. Roots in Mangrove Vegetation of Tapak Estuary, Semarang. (Widianingsih and Rudhi Pribadi)
Periphyton has a significant role in food web of mangrove community. The objective of this research was to analyze community structure of periphyton that live attached on mangrove roots of Tapak Estuary ecosystem.
This has been done in February until April 2006. Material used in the research was living sample of periphyton that live attached on mangrove roots of Tapak Estuary ecosystem. Explorative descriptive method was applied as research method while sample survey method was used in collecting data and purposive sample method was used to determine sampling location. Supporting parameter data include sediment grain size and organic substance content, turbidity, current velocity, temperature, salinity, dissolved oxygen, pH, nitrate, phosphate, and silicate from each sampling station.
Based on the result, there were three species mangrove found in Tapak estuary which was Avicennia marina (Forsk) Vierh., Rhizophora apiculata Blume dan Rhizophora mucronata Lamk. R. mucronata dan A. Marina were the species found in all research station. There were 48 genera from 6 class of periphyton in R.. mucronata root and 34 genera from 5 class periphyton in A. marina root. Coscinodiscus and Nitzchia were genera that found in all research station. The highest total density in R. mucronata root founded in February with 4032 ind/cm2 and the lowest in April with 1117 ind/cm2. On A. marina root the highest of total density founded in February with 3802 ind/cm2 and the lowest in April with April 1086 ind/cm2.
The highest diversity index in R. mucronata root was found in February Station 1 on the top part of the root with 2,95 and the lowest also in February Station 2 in the top part of the root with 1,61. Station 1 in the top part of the root in February also had the highest evenness index with 1,08 and the lowest founded in April Station 3 in the lower part of the root with 0,60. The highest dominancy index founded in February Station 3 on the top part of the root with 0,30 and the lowest in March Station 1 on the lower part of the root with 0,11. The highest diversity index in A. marina root was found in February Station 2 on the lower part of the root with 2,51 and the lowest in March Station 2 in the top part of the root with 1,56.On April in Station 2 on the top part of the root was the highest evenness index with 0,87 and the lowest in April Station 1 on the lower part of the root with 0,60. The highest dominancy was found in February Station 2 on the lower part of the root with 0,39 and the lowest part founded in Station 2 also in February with 0,13.
Keywords: Community Structure, Periphyton, Root, Rhizophora mucronata, Avicennia marina
Contact:
Aini Chairunnisa Amalia, S.Kel.
email: anis_amalia@yahoo.com
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