Monitoring of Phytoplankton Abundance and Chlorophyll-a Content in the Estuary of Banjar Kemuning River, Sidoarjo Regency, East Java

Abstract

Estuaries are coastal areas that have a fairly high fertility rate. This region can be said to be fertile because it is influenced by such physical factors as temperature, turbidity, light, and current as well as such chemical factors as salinity, dissolved oxygen, pH, and nutrient content. The estuary of the Banjar Kemuning River is a coastal area with a lot of human activities, and it is close to the mainland, causing the change in the nutrient content in the waters. The nutrient content in the waters is closely related to the phytoplankton abundance, as the higher the nutrient content in the waters, the greater the phytoplankton abundance and the chlorophyll-a content. The level of chlorophyll-a content in the waters can indirectly be used as an indicator of the phytoplankton abundance, which can determine the level of fertility of these waters. The purpose of this study was to determine the relationship between the phytoplankton abundance and the chlorophyll-a content in the estuary of the Banjar Kemuning River. This study is observational research with data analysis using linear regression, simple correlation (Pearson), and ANOVA. In addition, the data collection was carried out by purposive random sampling at predetermined points of stations. The results of this study indicated that the phytoplankton abundance and the chlorophyll-a content at the estuary of Banjar Kemuning River during different months were significantly different (P<0.05). The averaverage chlorophyll-a content during the study was 0.958 µg/L, 0.998 µg/L, and 1.167 µg/L. The conclusion was drawn that there is a difference between the phytoplankton abundance and the chlorophyll-a content each month and classified into high correlation.

Model of Phytoplankton Diversity in Belawan River, North Sumatera, Indonesia

“…According to Muis et al 20 , the range of H' values is part of the water quality assessment along with the physical chemistry of water. The average phytoplankton abundance during the study was 19,256, 19,044 and 22,613 cells LG 1 of 322 ind LG 1 is classified as low abundance, which reflects low water fertility 21 .…”

The dominance and proportions of plankton in Pacific white shrimp (Litopenaeus vannamei) ponds cultivated with the intensive system in Bulukumba Regency, South Sulawesi, Indonesia

“…Pond water samples were dripped on a Neubauer hemocytometer and calculated using the cell counting method, the number of each type of plankton that had been observed on one grid multiplied by 10 4 cells/mL [25]. The plankton obtained was identified referring to the book titled Phytoplankton Identification, Marine Phytoplankton Atlas of Kuwait's Waters, and Identifying Marine Phytoplankton [26].…”

Relationship between chlorophyll-a, rainfall, and climate phenomena in tropical archipelagic estuarine waters

“…Because of this, the concentration of Chl-a has been used as a proxy for eutrophication and trophic status [ 22 , 23 ]. Several studies have also examined the relationship between climate and the phenological cycle variations of phytoplankton [ 16 , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] ].…”

“…Extensive research conducted within the Indonesian waters has consistently highlighted the significant impacts of ENSO and IOD phenomena on phytoplankton blooms, leading to substantial fluctuations in Chl-a concentrations during El Niño/positive IOD and La Niña/negative IOD episodes [ 9 , [28] , [29] , [30] , [31] , [32] , [33] ]. Consequently, comprehending the intricate effects of ENSO and IOD on Chl-a concentration variability in Sumatera and Java has become a paramount research priority, essential for delineating the trophic dynamics of their estuarine ecosystems.…”