Keberadaan situ cilala ditinjau dari beberapa aspek limnologis

Abstract

The purpose of this research is to study the limnological status of Cilala reservoir, based on physical, chemical, and biological parameters. The observation comprise some morphometric of surface and vertical dimension, water quality measurements, plankton community structure, and primary productivity. Based on the some morphometric condition Cilala reservoir has a high potention of biological productivity, but the area of lake begins narrowing. The physical and chemical characteristics show that Cilala is still in good condition. The condition of TSS at inlet and the water debit of outlet show that the waters has a relatively high potention of sedimentation that lead to a shallowing condition. There were found 95 genus of phytoplankton from seven classes (Chlorophyceae, Cyanophyceae, Chrysophyceae, Euglenophyceae, Pyrrophyceae, and Xanthophyceae). Also found four major groups of zooplankton, i.e. Rotifera, Copepoda, Cladocera, and Protozoa Although the primary productivity is relatively low, based on orthophosphate, chlorophyll-a, and Nygaard Index, the waters is in mesotrophic-eutrophic status. As a whole, Cilala reservoir is still appropriate to fisheries activities.