Suitability of the various diversity index of phytoplankton in Garden House-Coastal Ornamental Lake, Pantai Indah Kapuk, North Jakarta

Abstract

Diversity is one of biotic community description within an ecosystem. A lot of diversity index has been developed. However, there is no consensus to suit the proper index to use. This study aimed to assess the suitability of the various diversity index of phytoplankton as community description, related to the water condition in coastal ornamental-lake of Garden House, Pantai Indah Kapuk, Jakarta. This research was conducted in July to December 2015 for sampling, laboratory analysis, and conformity assessment of diversity index (Margalef, Shannon, Simpson, McIntosh, and McIntosh evenness Index) that was based on the criterion of Discriminant Capacity approach. The results showed that there were 26 genera of phytoplankton from five classes, with density ranged from 8.9×103 to 7.6×109 cell/m3, and was dominated by Cyanophyceae. Based on the criteria of Discriminant Capacity, McIntosh Index was the most appropriate diversity index to describe phytoplankton community in this lake. Furthermore, the low value of McIntosh index showed that the population of phytoplankton communities was not distributed homogeneously. Related to water quality, the phytoplankton community was closely correlated to pH, salinity, nitrate, nitrite, and orthophosphate.