Relationship analysis of N/P ratio and phytoplankton abundance in Ranu Pakis using regression approach

Abstract

Ranu Pakis is a natural lake that formed by volcanic activity. The lake waters have many benefits including as a source of irrigation, aquaculture, agriculture, and tourism. The activities around Ranu Pakis have the potential to produce organic waste into the waters. High organic waste and nutrients resulted in eutrophication or high abundance of phytoplankton which threatens biodiversity in the lake. Nutrients in the waters consist of N and P. The ratio between N and P affect the composition and abundance of phytoplankton. The purpose of this study was to analyses the relationship between N/P ratios to the abundance of phytoplankton in Ranu Pakis using quintile regression approach. The results of this study indicated that the effect of the N/P ratio was different on various quintile.

Use of Harmful Algae Presence to Assess Water Quality in Lake Ranu Grati, Indonesia

“…Hence, these areas have been favoured as settlement sites [Ako et al, 2012]. For example, Lake Ranu Grati, located East Java, Indonesia -the lake is used for clean water, irrigating agricultural land, socio-cultural activities, fishing and freshwater fish cultivation [Mahmudi et al, 2019;Lusiana et al, 2020]. Previous studies have mentioned that the lake has encountered several problems, such as eutrophication, mainly caused by aquaculture (floating net cages) byproducts in the lakes that increase nutrients (N and P), and lake silting due to high sedimentation [Mahmudi et al, 2019].…”