Measurement of C-N magnitude and C/N ratio from particulate matter is used to explain the source of terrestrial and sea particulates. Therefore, this study aimed at using C/N ratio in assessing land-based material in the west coast of Spermonde area, Indonesia on suspended matter. Samples of SPM were collected in two seasons (transition and dry seasons), in coastal waters of Tallo, Maros, and Pangkep estuaries. The results of research showed that C tot was more abundant than was N tot in particulates from river rather than from sea region, reflecting most of the terrestrial organic matter stored before meeting with sea. C/N ratio on the west coast of South Sulawesi was in the range of 7-19.7, showing that organic matter in Tallo estuary in transition season was dominantly autochthonous, while in dry season it was found to be dominantly terrigenous organic matter that gave an indication that land factor was significant in waste supply. The same thing was found in Maros estuary and Pangkep estuary in transition season and dry season; at all points of observation there were findings of particulates coming from terrigenous organic matter. Percentage of nutrient absorbed in particulate was low and could become a eutrophication stressor, where SPM found only ranged from 9.60 to 55.1 mgL −1 with maximum average in dry season and minimum in transition season. On the contrary, POM was maximum in transition season and minimum in dry season with dominant particulate organic matter source from the sea itself.
Abstract. Tambaru R, Burhanuddin AI, Massinai A, Amran MA. 2021. Detection of marine microalgae (phytoplankton) quality to support seafood health: a case study on the west coast of South Sulawesi, Indonesia. Biodiversitas 22: 5179- 5186. The research aimed to detect marine microalgae quality to support seafood health was carried out from January to November 2020 along the west coast of South Sulawesi, Indonesia. Samples were collected from the coastal waters of Pangkep District, Maros District, and the northern part of Makassar City. Phytoplankton cell counts were obtained using the deposition method developed by Uthermol. Phytoplankton cell abundances were calculated through sweeping (census) using a Sedgwick Rafter Cell (SRC). Two-way analysis of variance (ANOVA) was used to compare the distribution of marine microalgae community abundance between observation stations and periods. Based on the types and relative abundance of phytoplankton present, i.e., harmful algal bloom (HAB) forming or not (non-HAB), the results showed the quality of marine microalgae, specifically, phytoplankton was relatively good. Many more non-HAB (94-98%) than HAB (2-6%) marine microalgae were detected. Thus, the phytoplankton flourishing in these waters is mostly suitable as food for other organisms, including fish and shellfish. This also means that if fishers harvest these fish and shellfish, they should be fit and safe for human consumption.
Dissolved silicate (DSi) Keywords: dissolved silicate, diatom, chlorophyll-a, coastal waters, South Sulawesi ABSTRAKSilikat terlarut di perairan pesisir dan laut berperan penting dalam pertumbuhan fitoplankton seperti diatom. Penelitian ini bertujuan untuk menghitung konsentrasi silikat terlarut di perairan pesisir pantai barat Sulawesi Selatan pada musim yang berbeda, dan untuk melihat hubungannya dengan kepadatan diatom dan klorofil-a. Sampel air, klorofil, dan plankton dikumpulkan pada April 2013 (musim peralihan), Juni 2013 (musim kemarau), dan Februari 2014 (musim hujan), dari perairan pesisir muara sungai Tallo-Makassar, Maros, dan Pangkep. Perbedaan variasi silikat antara musim dan antar lokasi diuji dengan Analisis Varian (ANOVA) faktorial, sedangkan pengaruh silikat pada kelimpahan diatom dan klorofil-a diuji dengan regresi sederhana. Secara umum konsentrasi silikat pada musim hujan lebih tinggi (35,2-85,2 µM), dibanding pada musim peralihan (10,4 µM) dan musim kemarau (9,59-24,1 µM). Konsentrasi silikat di perairan Maros lebih tinggi dibanding dua lokasi lainnya, berkisar antara 13,0-83,97 µM. Meningkatnya konsentrasi silikat tidak memberi pengaruh yang kuat pada kelimpahan diatom dan klorofil-a. Kelimpahan Diatom tertinggi terjadi pada musim peralihan, sebesar 9,7x10 7 sel/m 3 di Pangkep, 2,3x10 7 sel/m 3 di Tallo, dan 1,3x10 7 sel/m 3 di Maros. Ratarata klorofil-a di pesisir Makassar sebesar 4,52±4,66 mg/m 3 , Maros 1,40±1,06 mg/m 3 , dan Pangkep 2,72±1,94 mg/m 3 . Konsentrasi silikat yang tinggi di perairan pesisir bukan faktor pembatas pertumbuhan plankton, dan berpotensi menurunkan kualitas perairan karena eutrofikasi dan pengayaan monospesies diatom.
Gracilaria salicornia is one of the various types of seaweed that can be commercialized because it has the potential as an antioxidant due to its high chlorophyll-a pigment. The purpose of this study is to the identification of chlorophyll compound of G. Salicornia seaweeds. This identification has been carried out using Thin Layer Chromatography (TLC) method. Four compounds have been found, namely xanthophyll, chlorophyll b, chlorophyll a, and pheophytin. Xanthophyll was identified with the yellow spot on TLC plates, in which the Rf is 0.55. Chlorophyll b is a yellow-green spot with Rf is 0.60, the Rf of Chlorophyll a is 0,68 with the color blue-green, whereas pheophytin is indicated as a black spot with the Rf 0.73. Chlorophyll a have the maximum wavelength at 430 nm in the blue spectral and 662 nm in the red spectral.
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