Nutrient, Macroalgae, and Echinodermata Distribution in Northern Ambon Area During 2017 Until 2018
Dhimaz Galih Prasetyo (a*), Malik S. Abdul (a), Idha Y. Ikhsani (a), Abdul W. Rajab (a), Hairati Arfah (a), Mutiara R. Putri (b), dan Dayu W. Purnaningtyas (b)
a) Research Center for Deep Sea, Indonesian Institute of Sciences
Jl. Y. Syaranamual, Ambon 97233, Indonesia
*dhim001[at]lipi.go.id
b) Oceanography Research Group, Faculty of Earth Science and Technology
Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung 40132, Indonesia
Abstract
Northern Ambon Area has a unique characteristic in term of biodiversity, including Macroalgae and Echinodermata. This research aims to determine the distribution of nutrients in the territorial waters of North Ambon in 2017 and 2018 and their effects on the distribution of Macroalgae and Echinodermata. Seawater samples were obtained in 26 sampling points in 2017 and 18 sampling points in 2018 located in Northern Ambon coastal area. The determination of chemical parameters are using a Spectrophotometric Method consisting of NO3, PO4, and SiO2 concentration determination, as well as determining pH and DO using a pH meter from seawater samples taken. The results of the analysis show that the average concentrations of NO3, PO4, and SiO2 in the study area in 2017 were 0.090 mg/L; 0.042 mg/L; and 0.330 mg/L with an average DO and pH content of 5.83 mg/L and 8.19. Meanwhile, the average concentrations of NO3, PO4, and SiO2 in the sampling area in 2018 were 0.028 mg/L; 0.021 mg/L; and 0.129 mg/L with an average DO content and pH of 7.54 mg/L and 7.64 mg/L. Based on the 2004 Decree of the State Minister of the Environment, No. 51 about Sea Water Quality Standards for Marine Biota, it is known that the concentration of NO3 and PO4 in the Northern Ambon coastal area exceeds the maximum threshold that has been determined, but still indicate the suitability intended for the life of the biota. The values of NO3 and PO4 concentrations in 2017 and 2018 also indicate that the trophic status of the seawater is between Oligothropic and Mesotrophic. There is a decrease in the concentration of whole nutrients from 2017 to 2018 which influences the variability of macroalgae and Echinodermata observed in the study area in 2018 when compared to 2017. The Macroalgae classes that can be found in this area are Rhodophyceae, Phaeophyceae, and Chlorophyceae. Furthermore, the Echinodermata classes found in this area are Holothuroidea, Ophiuroidea, Asteroidea and Echinoidea.
Keywords: Ambon Area, Echinodermata, Macroalgae, Nutrient
Topic: Marine Resources, Conversation and ICZM