Domas coastal waters, located east of Banten Bay, have an enormous potential for fisheries resources closely related to the presence of plankton in the area. This study was carried out for 6 months, from August 2021 to January 2022, to examine the biodiversity and community structure of zooplankton in the Domas coastal waters. Sampling was carried out monthly at six stations distributed from coastal areas to the sea. Data on the zooplankton were examined for abundance, diversity, evenness, and dominance indices. Based on the observations, zooplankton in these waters consisted of 19 classes, namely Actinopteri, Appendicularia, Bivalvia, Branchiopoda, Cirripedia, Cnidaria, Copepoda, Ctenophora, Enteropneusta, Gastropoda, Gymnolaemata, Hydrozoa, Malacostraca, Ostracoda, Ophiuroidea, Phoronida, Polychaeta, Sagittoidea, and Thaliacea. The zooplankton found in abundance were Calanoida, Cyclopoida, and Nauplius. The number of taxa and abundance varied according to sampling time and location, 7-34 inds/m3 and 627-41386 inds/m3, respectively. The diversity, evenness, and dominance indices varied, 0.885-2.108, 0.327-0.797, and 0.172-0.601, respectively. Based on the results of these calculations, it can be stated that the diversity, evenness, and dominance of the zooplankton in these waters are classified as moderate.
The connectivity between seagrass and mangrove ecosystems has synergistic benefits of conserving the land-sea ecosystems of the small islands. The physicochemical properties of the two ecosystems lead to the success of the habitat of the interconnected zone. This study aimed to analyze the physicochemical factors in the mangrove and seagrass ecosystems on Pramuka Island and understand the factors influencing the phytoplankton production of small island coastal ecosystems. Sediment and water collection were carried out on Pramuka Island, Indonesia, to measure physicochemical parameters. Mangrove and seagrass ecosystems have the highest DO, temperature, and pH values. The phytoplankton counts showed significant variation between the sampling sites with a predominance of the class Cyanophyceae. The estimated primary productivity of chlorophyll-a indicated that its concentration was higher in mangroves than in seagrass. A similar trend was observed in nutrient loads and dissolved inorganic nitrogen. Results of the present study clearly showed that an increased concentration of dissolved inorganic nutrient influence the concentration of chlorophyll-a as an indicator of primary productivity. These findings will provide a preliminary analysis of the physicochemical conditions and productivity on Pramuka Island.
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