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Research Article Volume 14 Issue 1
Water quality parameters and phytoplankton characteristics in coastal mangrove ecosystem
Aniefiok Ini Inyang, Monica Udeme Dan, Kokoette Sunday Effiong, Robert Udo Udo
Received: February 25, 2025 | Published: March 12, 2025
Citation: Inyang AI, Dan MU, Effiong KS, et al. Water quality parameters and phytoplankton characteristics in coastal mangrove ecosystem. J Aquac Mar Biol. 2025;14(1):33-44. DOI: 10.15406/jamb.2025.14.00413
Abstract
Studies on the water quality variable and phytoplankton characteristics in mangrove areas of Guangdong, China was carried out to determine the impact of changing water quality on phytoplankton and its cell size characteristics. Plankton samples were collected spatially from July to August 2018, at 23 selected sites across the mangroves. From the 630 taxa identified, diatoms constituted the highest number of species (420 species) and contributed 71.90% of the total phytoplankton abundance. Other important phyla were Cyanobacteria (16.35%, with 83 species) and Chlorophyta (10.70%, with 87species). Across all the sites, algal biomass was highest in the Coscinodiscophyceae compared to the other Classes of phytoplankton. Though the cell size range was 0.8-306µm, a greater proportion of phytoplankton was found within > 1000µm³ and 250 to <100µm³. The results of canonical correspondence analysis revealed that species with cell size <100µm³ were associated with increase electrical conductivity and nitrate concentration, while species with cell size >1000µm³ were associated with salinity and pH variation. The massive proliferation of these species, Chaetoceros decipiens, Monoraphidium irregulare , Synechocystis sp., and Pseudanabaena limnetica could become an indicator of nutrient enrichment. This study confirms that the Guangdong mangrove areas inhabit the richest phytoplankton community, and their cells size distributions are controlled by the water quality parameters.
Keywords: Algal biomass, cell-size dynamics, mangrove ecosystem, nutrients
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