Effect of Nutrient Inputs on Water Quality Change and Phytoplankton Growth in Atsumi Bay

Abstract

Eutrophication in an estuary occurs as an effect of the enrichment of nutrient inputs from rivers. This condition has become one of the most common environmental issues experienced around the globe and especially in Japan. Atsumi Bay is a eutrophic coastal area in Japan. The objective of this research was to analyze the influences of nutrient inputs from the Umeda River into Atsumi Bay on pre-and post-rainfall water quality conditions. This study was conducted from July to October 2010. The results showed a decrease of surface salinity after rainfall indicating that huge freshwater inputs had overlaid the surface layer of Atsumi Bay rather than the bottom layer. Moreover, post-rainfall conditions showed an increase of chlorophyll a as an effect of phytoplankton growth, followed by an increase of particulate nutrients. On the other hand, dissolved nutrients decreased due to uptake by phytoplankton and dilution by freshwater.

Factors of the slow decline in the activity concentration of 137Cs in eutrophic lake water

“…It is known that rainfall causes the input of nutrients from rivers and consequently an increase in chlorophyll a. A similar phenomenon can occur at the studied lake. That is, nutrients dissolved in water flow from rivers and the lakeside into the lake, resulting in the proliferation of phytoplankton.…”

The diversity of plankton as bioindicators in Kakap River Estuary, West Kalimantan

“…DO at station 1 was higher than the other stations, and there was also nutrient input from the discharge of organic matter into the waters, as a result the diversity of species and abundance of plankton at this location is high. The presence of these nutrients affected the growth of plankton in the waters (Mahlil et al, 2018). Runoff from settlements contains a lot of nutrients that enter the water body and are used for plankton growth.…”

Stabilitas Performa Dan Realibilitas Ipal Domestik Dengan Kombinasi Aerasi Secara Intermittent Dengan Resirkulasi Efluen Dan Microbubble Generator

“…Menurunnya indeks kualitas air di Yogyakarta Wong, Sungai Gadjah (Putro, 2017;Saraswati et al, 2019) juga dapat menjadi indikasi terjadinya pencemaran yang salah satu penyebab utamanya adalah pembuangan air limbah domestik tanpa diolah. Meskipun tidak menunjukkan relevansi secara langsung terhadap kondisi biotik di badan air, kadar COD dapat merepresentasikan tingginya pencemar organik di badan air (Niemi et al, 2006), sedangkan kadar nutrien yang tinggi di badan air dapat meningkatkan pertumbuhan fitoplankton yang dapat menyebabkan terjadinya algae bloom di perairan (Mahlil et al, 2018;Matthews, 2008) Dalam rangka pengendalian pencemaran air, Kementerian Lingkungan Hidup dan mengesahkan Peraturan Kehutanan (LHK) Menteri LHK No. 68 tahun 2016 tentang baku mutu air limbah yang mengatur batasan maksimal konsentrasi pencemar yang diijinkan untuk dibuang ke lingkungan.…”