Abstract: Climate change induces lake function, loss of biodiversity from the lake, flooding in the wet season in a tropical area, the freshwater crisis in a dry season, and decrease food production. The rate of abiotic change is unprecedented, which pose serious challenges for diatom, acclimate, adapt, migrate, change symbiotic association, reshuffle communities, or change responses to lose processes. Diatom fossil, a siliceous microalga preserved in sediment, able to use for reconstruction of past conditions and predict the future. Sediment samples were collected from the lakes, were sliced 1 cm for dating and diatom analysis. The different diatom assemblages from such layers of sediment core indicated environmental changes due to climate change. Sediment core from the lake is similar to diary book that record environmental changes around the lake. Therefore, the suitable management can be developed based on the reconstruction of past condition. Find the future from the past.

Keywords: climate change, diatom, lake management

Biography: Prof. Tri Retnaningsih Soeprobowati is Vice Dean for Resources and Innovation, School of Postgraduate Studies, Universitas Diponegoro, Indonesia 2015-2024. She is a lecturer at the Department of Biology for 31 years, and at the program of doctorate and Master of Environmental Science for 10 years. Her special fields are Environmental Biology, bioindicator of water quality. She is an expert for the Ministry of Environment and Forestry (since 2011); have research collaboration with BATAN (since 2010), with Tokyo Gakugei University, Japan (2011): SimRiver: Simulation software for the understanding of the river environment; with University of Bangor – Aberystwyth, UK – Western Carolina, USA – ITB - Biotrop – UNDIP – Brawijaya – PT Bukit Asam (2014-2017); Federation University, Australia (2009-now), Australia Nuclear for Science and Technology Organization (ANSTO, 2009 – now). Since 2020 she interests in paleolimnology, that combines biostratigraphy using diatom, and chronostratigraphy by dating sediment using a nuclear application (210Pb or 14C) for environmental management. Reconstruction of past environmental changes for lake management. Find the future from the past.