https://inajl.org/index.php/inajl <p><strong><em>Indonesian Journal of Limnology</em></strong> (InaJL) is a periodical publication from the Indonesian Society of Limnology (Masyarakat Limnologi Indonesia [MLI]). Published bi-annually, the journal bridges an effective communication and dissemination of research in tropical limnology.</p> <p>This journal integrates multidisciplinary studies i.e. physics, chemistry, biology, hydrology, geology, and other combination of those studies that are relevant to understanding inland water ecosystem. Inland waters cover all forms of water bodies within the boundaries of the land. This also means rivers, swamps, lakes, water, wetlands, reservoirs, ponds, and dams.</p> en-US alirahmatoffice@gmail.com (Ali Rahmat, Ph.D.) kodarsyah@gmail.com (Kodarsyah) Mon, 13 Oct 2025 00:00:00 +0700 OJS 3.2.1.1 http://blogs.law.harvard.edu/tech/rss 60 https://inajl.org/index.php/inajl/article/view/88 <p>ENSO is an important driver of hydroclimate variability in Indonesia and is strongly suspected to influence the dynamics of floodplain lakes. However, no study to date has combined the ENSO index (SOI) and satellite permanent water area time series for Lake Semayang. This study examines these linkages using 30 m resolution satellite image time series for 2000-2020. Permanent water area was obtained from JRC Global Surface Water, while SOI from NOAA. Monthly series were aligned and aggregated annually; the SOI-PWA relationship was analyzed by Pearson correlation and monthly lead-lag exploration (cross-correlation). The trend of the original annual series was tested nonparametrically with Mann-Kendall and the slope was estimated using Theil-Sen. Results showed a significant positive relationship between annual SOI and permanent water area of Semayang Lake (r = 0.591; p = 0.0048; r² ? 0.35). Monthly explorations displayed peaks at small positive breaks, but at the annual scale the strongest relationships were contemporaneous (same year). The original annual series show no significant monotonic trend over 2000-2020 according to the Mann-Kendall test, and the Theil-Sen estimates are small with confidence intervals that include zero. This finding confirms that La Niña trending conditions are associated with permanent water area expansion, while El Niño trending conditions are associated with shrinkage, making interannual variability the main driver of lake area change. The practical implications are that SOI information can be utilized for seasonal perspectives in navigation, fisheries and flood preparedness, and integrated into regional-level water resources management and climate adaptation planning in lowland wetlands in the region.</p> Muhammad Riza, Najwan Al-Ghifari, Zetsaona Sihotang, Nanda Khoirunisa, Mislan, Idris Mandang Copyright (c) 2025 Muhammad Riza, Najwan Al-Ghifari, Zetsaona Sihotang, Nanda Khoirunisa, Mislan, Idris Mandang https://creativecommons.org/licenses/by/4.0/ https://inajl.org/index.php/inajl/article/view/88 Sun, 09 Nov 2025 00:00:00 +0700