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"A natural phenomenon called as tubo belerang had occurred repeatedly in Lake Maninjau where the sulfide odorous water was apparent causing massive fish kill. Sulfur biogeochemistry in sulfur rich lakes can be critical when inputs of organic matter are high as in Lake Maninjau which has been exploited by floating cage fishery. The objective of the research is to study the biogeochemistry of sulfur in Lake Maninjau and to determine what factors might initiate the natural phenomenon occurrence. The Oxycontin layer had Sheffield from the depth of 20-40 m in 2006 to the depth of 10-20 m in 2008. The dynamics of bio geochemistry of sulfur in Lake Maninjau could be perceived from Sulfide profiles where increasing Sulfide concentrations detected annually. Higher Sulfide concentrations produced indicating more sulfate was reduced in the hypothalami layer. Sulfide concentration reached at level of 5 mg/L in the pore water of sediment. The toxic hydrogen sulfide concentrations were 10 - 120 ug/L. Sulfate concentrations ranged from 4 to 16 mg/L. Based on the pH values, the sulfur species H2S and HS were present in the lake water. Most of sulfur in Lake Maninjau were deposited in the sediment as iron Sulfide solids. The accumulation of organic matter in the hypothalami in the deepest part of the lake and Sheffield Oxycontin layer in four year observation periods indicated that the effect of floating cage fishery on the lake conditions was apparently atrocious. Increased in concentration of organic matter could play an important role on the dynamic of bio geochemistry of sulfur in Lake Maninjau and could be one of the major causes that might trigger the tubo belerang occurrence."

"The eleven chapters cover many aspects of the physics, geochemistry and biology of the lake, with a particular focus on the unique physical and geochemical features of the water column and on the ecological functioning of the surface waters. The impacts of the introduced fish species and the potential impacts of methane exploitation are also summarized. This multi-disciplinary book may also be used as an introduction to the limnology and biogeochemistry of large tropical lakes, as it covers various aspects of the physics, geochemistry, biology and ecology of the African Great Rift lakes.​"

"Tingginya tingkat pembangunan di kawasan perkotaan telah meningkatkan degradasi lingkungan pada berbagai ekosistem termasuk danau dan waduk. Degradasi ini mengancam keberlanjutan dan kemampuan ekosistem danau dan waduk untuk memberikan jasa ekosistem kepada masyarakat. Jakarta adalah salah satu kota megapolitan di Indonesia yang memiliki potensi ekosistem danau dan waduk cukup tinggi. Masalah dalam penelitian ini adalah belum dilakukannya pengelolaan ekosistem danau dan waduk secara berkelanjutan. Tujuan penelitian ini adalah menganalisis kondisi jasa ekosistem danau dan waduk di lokasi penelitian; menganalisis keberlanjutan jasa ekosistem pada ekosistem danau dan waduk di lokasi penelitian; dan menyusun konsep keberlanjutan ekosistem danau dan waduk di kota megapolitan berdasarkan hasil analisis. Metode yang digunakan terdiri atas analisis penggunaan lahan, potensi produksi ikan, indeks kualitas air, statistik deskriptif, serta metode lain terkait pendugaan jasa ekosistem. Hasil penelitian menunjukkan bahwa lokasi penelitian belum secara optimal memberikan jasa penyedia air, ikan, dan produk pertanian karena rendahnya jasa pengaturan kualitas air. Jasa pengaturan iklim mikro dan banjir serta jasa budaya menunjukkan kualitas yang cukup baik sedangkan jasa pendukung ekosistem menunjukkan hasil yang beragam di setiap lokasi. Terdapat beberapa hal yang menghambat keberlanjutan ekosistem seperti program pengelolaan, adanya konflik penyediaan jasa ekosistem dengan pilar keberlanjutan, serta masih rendahnya pemahaman dan kesediaan masyarakat dalam pengelolaan danau dan waduk. Kesimpulan penelitian ini menunjukkan bahwa 4 pilar keberlanjutan (pengelolaan lingkungan, pembangunan sosial, peningkatan ekonomi, dan perbaikan tata kelola) diperlukan untuk mewujudkan ekosistem danau dan waduk perkotaan berkelanjutan yang dapat dicapai dengan perbaikan program optimalisasi jasa ekosistem, sistem tata kelola, dan partisipasi masyarakat.

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The high level of development in urban areas has increased environmental degradation in various ecosystems including lakes and reservoirs. This degradation threatens the sustainability and ability of lake and reservoir ecosystems to provide ecosystem services to the community. Jakarta is one of megapolitan cities in Indonesia that has quite high potential for lake and reservoir ecosystems. The problem in this research is that the management of lake and reservoir ecosystems has not been carried out sustainably. The objectives of this study were to analyze the condition of ecosystem services in lakes and reservoirs in the research location; analyze the sustainability of ecosystem services related to environmental, social, and economic aspects of lakes and reservoirs ecosystem in the research location; and develop the concept of sustainable lake and reservoir ecosystems in the megapolitan cities based on the analysis results. The method used consists of land use analysis, fish production potential, water quality index, descriptive statistics, and other methods related to ecosystem services estimation. The results showed that the study site had not optimally provided water, fish and agricultural products due to low water quality regulating services. Microclimate regulating, flood regulating, and cultural services show good quality while ecosystem support services show varying results in each location. There are a number of things that impede ecosystem sustainability such as management programs, conflicts over the supply of ecosystem services with the pillars of sustainability, and the low comprehension and willingness of the community in managing lakes and reservoirs. The conclusion of this study is the 4 pillars of sustainability (environmental management, social development, economic improvement, and good governance) are needed to realize sustainable urban lake and reservoir ecosystems which can be achieved by improving ecosystem service optimization programs, governance systems, and community participation."

"In this study, a three-dimensional (3D) hydrodynamic model was developed to investigate the Watercirculation characteristics of a shallow tropical lake environment (Laguna Lake, Philippines) undervarying wind stress, watershed river discharge, and sea interaction (Manila Bay, Philippines) toelucidate hydrodynamic implications to eutrophic vulnerability. The analyses were based on fieldobservations and numerical simulations covering longterm periods (dry and wet season) andintensive field measurements. The results demonstrated different circulation pattems and verticalcurrent regimes in time and space that accentuated a thermally stratified lake environment in spiteof a shallow water depth (2.5 meter average). In the wet season, current movement is generallytoward Pasig River, the lake’s only outlet, with embayment water mass moving in the clockwisedirection. The dry season lake flow pattern was characterized by counter-clockwise gyrecirculations, Pasig River backflow, and salinity intrusion. Wind forces showed strong influence onlake hydrodynamics due to the complex surrounding topography, steep land-ake thermaldifference, regular passage of tropical storms and typhoons, and shifts in the monsoon winddirection. The resulting mixed layer hydrodynamics revealed important implications to theplanktonic movement, nutrient recycling, and primary production of the lake. Long termcontinuous observations and numerical analyses also demonstrated the intrusion of seawater toLaguna Lake that potentially adds to its eutrophic vulnerability with the associated entry of nutrientand microorganism-rich polluted waters from Metro Manila."

"Danau merupakan tempat bermuaranya segala jenis pencemaran.Penelitian ini menghitung dan mensimulasikan perkembangan nilai ekonomi dari setiap tipe penggunaan lahan, tingkat pencemaran serta menganalisis tingkat kerentanan sosial ekonomi masyarakat nagari.Studi ini mengungkapkan bahwa dari tipe penggunaan lahan yang memperlihatkan perkembangan ekonomi dan tingkat kerusakan yang tinggi adalah penggunaan lahan KJA. Pertumbuhan ekonomi KJA tahun 2014 mencapai 1,5 trilyun rupiah, sedangkan kondisi IMLP perairan danau tahun 2014 adalah 60,37 yang berarti Danau Maninjau dalam kondis tercemar sedang. Dilihat dari tingkat kerentanan sosial ekonomi masyarakat nagari yang ada di KDM ditemukan bahwa nagari yang termasuk rentan yaitu Nagari Tanjung sani, Nagari Sungai Batang, Nagari Bayur, Nagari Koto Malintang dan Nagari Maninjau. Alternatif kebijakan mitigasi dengan menggunakan analisis hierarki proses diajukan prioritas kebijakan mitigasi ekosistem danau maninjau berkelanjutan pada kawasan rentan yaitu mengembangkan pertanian lahan kering, menerapkan pertanian pada lahan basah, penguatan hukum adat dan nilai-nilai tradisi, membuat pakan organik yang ramah lingkungan, mengembangakan ekonomi kreatif.

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The lake is place boils down all kinds of pollution. This study calculate and simulate the development of economic value from each type land use, the level of pollution and to analyze the vulnerability of socioeconomic villages. This study revealed that from types of land use that demonstrate the economic development and a high level of damage is land use Floating Net Cages (FNC). FNC economic growth in 2014 reached 1.5 trillion IDR, while the condition of Water Qualityindex(WQI) of the lake in 2014 was 64,56, which means Maninjau Lake in polluted conditions being. Judging from the level of social and economic vulnerability village communities that exist in the lake area maninjau found sub-districts that are prone namely Tanjung sani, Sungai Batang, Bayur, Koto Malintang and Maninjau. Alternative mitigation policies by using analytical hierarchy process proposed priority mitigation policies lake ecosystems maninjau sustainable in areas vulnerable are developing dryland agriculture, agricultural implement on wetlands, strengthening of customary law and traditional values, making organic feed environmentally friendly, develop the creative economy."

"This book focuses on the long-term interactions between people and nature in and around Lake Biwa, one of the oldest lakes in the world. Accordingly, it not only covers the characteristics of the biota of this ancient lake, but also approaches it as a ‘cultural ancient lake.’ Furthermore, various problems affecting the lake, especially recent environmental changes that occurred before and after Japan’s rapid economic growth of the 1950s and 60s, are reviewed, including water pollution, lakeshore development and the reclamation of attached lakes, alien and invasive species, and problems related to the recent warming of the climate. Lastly, by analyzing data on these problems collected by the local government and residents of the lake basin, the book provides a comprehensive outlook on the future of Lake Biwa and people’s lifestyles. "

"ABSTRAKJenis penelitian ini adalah etnografi yang berfokus pada aktivitas pemanfaatan ekosistem danau dan bentuk-bentuk kebijakan pengelolaan yang ditetapkan oleh pemerintah dan kelembagaan adat. Teknik pengumpulan data adalah studi pustaka, observasi partisipasi, dan wawancara mendalam. Lokasi penelitian meliputi empat wilayah kecamatan yang memiliki wilayah danau terluas yakni Kecamatan Tempe, Kecamatan Sabbang Paru, Kecamatan Tanasitolo Dan kecamatan Belawa. Informan adalah masyarakat sekitar danau, tokoh adat, serta kepala dan staf SKPD yang terkait dengan manajemen danau. Penelitian ini menemukan Danau Tempe menjadi sumber daya milik bersama (common property resources) karena dapat dimanfaatkan dan diakses secara bersama oleh semua orang tanpa batasan yang tegas. Bentuk kebijakan pengelolaan danau dirancang dan dibuat oleh pemerintah dan lembaga adat lokal. Bentuk kongkrit kebijakan pengelolaan danau, dijabarkan dalam peraturan daerah serta dalam bentuk system norma, upacara adat dan pamali-pamali, yang pengawasannya dilakukan oleh pembuat kebijakan, serta masyarakat. Secara de yure, Danau tempe dikelola secara kolaborasi (collaborative management ) antara pemerintah dengan lembaga adat, namun secara de facto, fungsi manajemen kolaborasi tidak optimal sehingga Danau Tempe tampak seperti sumber daya yang bisa diakses oleh siapa saja, tanpa aturan ( open access )

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ABSTRACTThis research is a ethnography type that focused to the activity of lake ecosystem and forms of management policies set by governments and traditional institutions. The data collection technique is literature, participant observation and deep interviews. Research Location covers four regions districts that had the largest lake district area of Tempe, District Sabbangparu, district Tanasitolo and district Belawa. Informants are people around the lake, traditional leaders and also the heads and staff SKPD who related to lake management. This study found that the lake Tempe as be a common property resources (common property resources) because it can be shared and utilized by all people without clear limits. Forms of lake management policy is designed and made by local government and traditional institutions. Concrete forms of lake management policy, spelled out in local legislation as well as in the form of system norms, ceremonies and taboos-taboos, the monitoring carried out by policy makers and the public. In de yure, Tempe Lake managed in collaboration between the government and indigenous institutions (collaborative management), but de facto, collaboration management functions are not optimal so Tempe lake looks like resources that can be accessed by anyone, without rules (open access) "