Plankton is minute organism living drifted away in a water column. Phytoplankton is floral-plankton which able to synthesize their food using sun energy through photosynthesis process. In most time the presences of phytoplanktons influence the productivity of the waters, but in some extreme condition they can be dangerous for their environment too. The aim of this study is to identify community structure of phytoplankton in Segara Anakan lagoon and its related environmental factors, and hopefully the findings will be useful as back up data for the monitoring programmed of the lagoon.
The study was conducted in Segara Anakan lagoon, Cilacap, during the period of September to December 2004. The study material was phytoplankton cached using a planktonet in certain sampling points Segara Anakan lagoon in the lagoon. Some physical and chemical parameters of the water, i.e.: dissolved oxygen, depth and clarity, pH, salinity and temperature, were also recorded during the sampling. There were three sampling locations i.e.: Plawangan which lied between the lagoon and the open sea of Indian Ocean, Klaces in the main lagoon body and Donan at the other end of the lagoon which strongly influenced by nearby industrial area.
There were at least 59 genera of phytoplankton was recorded during the sampling period; Bacillariophyceae 38 genera, Cyanophyceae 8, Dinophyceae 7, Chlorophyceae 5, and Euglenophyceae 1. The most diverse location was Klaces area in October sampling time (42 genera), and the least was also in Klaces for the period of December (16 genera). Nitzchia, Coscinodiscus, Guinardia, and Leptocylindrus were the most common genera and found in all locations and sampling times. With regard to sampling time, the mean abundance of the phytoplankton in September was 3,229.72 cell/liter, October 925.54 cell/liter, November 42.38 cell/liter, and December 126.00 cell/liter. Meanwhile according to sampling location the mean abundance of the phytoplankton in Plawangan was 158.35 cell/liter, Klaces 577.50 cell/liter, and Donan 2,506.87 cell/liter. In general the most abundance of phytoplankton was found in Donan area for September period (8,396.58 cell/liter) and Asterionella was the most abundance genus (25,224 cell/liter in the 8th station). The lowest abundance of phytoplankton was found in Donan area for the period of (26.08 cell/liter).
The value of Diversity Index in general was very low to medium (ranged between 0.12 to 2.39), similarly the value of Evenness Index was low to medium (0.03 to 0.59). However the value of Domination Index (C) was from low to high rank (0.11 up to 0.97). The value Similarity Index across sampling time (41.79 to 77.92) and sampling location (51.06 to 95.89) so therefore falls into medium to high category.
Keywords: phytoplankton, community structure, Segara Anakan Cilacap
Author: Aris Kurniawan
Advisors: Widianingsih and Retno Hartati
The study was conducted in Segara Anakan lagoon, Cilacap, during the period of September to December 2004. The study material was phytoplankton cached using a planktonet in certain sampling points Segara Anakan lagoon in the lagoon. Some physical and chemical parameters of the water, i.e.: dissolved oxygen, depth and clarity, pH, salinity and temperature, were also recorded during the sampling. There were three sampling locations i.e.: Plawangan which lied between the lagoon and the open sea of Indian Ocean, Klaces in the main lagoon body and Donan at the other end of the lagoon which strongly influenced by nearby industrial area.
There were at least 59 genera of phytoplankton was recorded during the sampling period; Bacillariophyceae 38 genera, Cyanophyceae 8, Dinophyceae 7, Chlorophyceae 5, and Euglenophyceae 1. The most diverse location was Klaces area in October sampling time (42 genera), and the least was also in Klaces for the period of December (16 genera). Nitzchia, Coscinodiscus, Guinardia, and Leptocylindrus were the most common genera and found in all locations and sampling times. With regard to sampling time, the mean abundance of the phytoplankton in September was 3,229.72 cell/liter, October 925.54 cell/liter, November 42.38 cell/liter, and December 126.00 cell/liter. Meanwhile according to sampling location the mean abundance of the phytoplankton in Plawangan was 158.35 cell/liter, Klaces 577.50 cell/liter, and Donan 2,506.87 cell/liter. In general the most abundance of phytoplankton was found in Donan area for September period (8,396.58 cell/liter) and Asterionella was the most abundance genus (25,224 cell/liter in the 8th station). The lowest abundance of phytoplankton was found in Donan area for the period of (26.08 cell/liter).
The value of Diversity Index in general was very low to medium (ranged between 0.12 to 2.39), similarly the value of Evenness Index was low to medium (0.03 to 0.59). However the value of Domination Index (C) was from low to high rank (0.11 up to 0.97). The value Similarity Index across sampling time (41.79 to 77.92) and sampling location (51.06 to 95.89) so therefore falls into medium to high category.
Keywords: phytoplankton, community structure, Segara Anakan Cilacap
Author: Aris Kurniawan
Advisors: Widianingsih and Retno Hartati
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