KOMPOSISI JENIS DAN KEANEKARAGAMAN FITOPLANKTON SAAT PENAMBANGAN PASIR INTENSIF DI MUARA SUNGAI POHARA SULAWESI TENGGARA

Abstract

Abstract
Local communities along the banks of Pohara River have been benefited from the ecological
services provided by the river ecosystem. However, the increasing trend of extraction pattern
of natural resources through several economic activities along the river has put significant
pressure on the surrounding ecosystem. One of the activities that allegedly have an impact on
the estuary productivity decline of the area is intensive sand mining operations. This recent
study was carried out to study the composition and diversity of phytoplankton during heavy
sand mining season in order to provide baseline data for the better management of the area.
Field work was conducted from April 2007 to February 2008 in Pohara estuary. Plankton
samples were collected from six sampling stations and analyzed using quantitative descriptive
method. Results of the study found that the highest spatial and temporal distribution of
phytoplankton species found in the areas were phytoplankton from the classes of
Chlorophyceae and Dinophyceae while the lowest was from the class of Euglenophyceae.
Two species found in every sampling station were Euglenophyceae and Cyanophyceae.
Diversity index showed significant differences and categorized from high to low diversity
based on sampling stations and observation times with the values ranged between 2231-2524
and 0906-2346, respectively. In addition, the uniformity index based on station and
observation times ranged between 0758-0819 and 0906-2346, respectively which fell in the
category of high and medium uniformity.
Keywords : Phytoplankton, Composition, Diversity, Pohara River

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