Analysis of Seagrass Condition Using Spectral Reflection of Quickbird Imagery on Saronde Island North Gorontalo

Abstract

This study was encouraged by the importance of understanding the conditions of seagrass which becomes the source of food for many species of marine fish. Seagrass condition will indirectly affect the quantity and quality of fish obtained by fishermen who live in coastal areas. High-resolution imagery can simplify and accelerate data collection process of conditions of seagrass on the outer islands of Gorontalo Province. This study used digital remote sensing method using unsupervised classification and also assisted by the measurements of the transcule based on the pixel size that aims to detect and to match the information obtained from QuickBird imagery, to ultimately obtain information about seagrass condition. Seagrass with abundant/good condition can be found at station 1,3,4,5, and 6 with an average cover up to 67,70%, 63,54%, 68,75%, 62,5%, and 65,62% respectively. Meanwhile, seagrass with the less abundant/poor condition can be found at station 2 with an average cover up to 50% and at station 7 with an average cover up to 52,08%. Distribution of seagrass on Saronde Island covers up to 6. 9654 Ha. Seagrass with abundant/good condition covers 4,2025 Ha, and lowly abundant/poor seagrass covers 2,7629 Ha. Seagrass on Saronde Island is still in abundant/good condition with an average cover up to 61,45 % and form mixed vegetation.

Population dynamics of reef fish in the Kwandang Bay, Sulawesi Sea, Indonesia

“…According to official statistics, there are 21 islands in the Kwandang Bay area. These islands are surrounded by coral reefs, with many also having seagrass and/or mangrove ecosystems (Olii et al 2015;Kasim et al 2018;Yusuf and Indrawan 2019). Several have been or are being developed as tourist attractions, including Saronde, Ponelo, Bogisa, Hulawa and Lampu Island (Yusuf and Indrawan 2019;Manyoe et al 2022).…”

“…These islands are surrounded by coral reefs, with many also having seagrass and/or mangrove ecosystems (Olii et al 2015;Kasim et al 2018;Yusuf and Indrawan 2019). Several have been or are being developed as tourist attractions, including Saronde, Ponelo, Bogisa, Hulawa and Lampu Island (Yusuf and Indrawan 2019;Manyoe et al 2022). The tropical coastal ecosystems and plankton-rich waters of Kwandang Bay combined with natural harbor features have made Kwandang Bay in North Gorontalo District the main center for both pelagic and reef fisheries in Gorontalo Province (Sahami et al 2017;Chodrijah et al 2020;Achmad et al 2021).…”