1. Limnological Institute, University of Konstanz, Mainaustraße 252, Konstanz 78467, Germany.
2. Institute of Environmental Science and Meteorology, University of the Philippines Diliman, Quezon City 1101, Philippines.
3. Department of Biological Sciences, College of Science, Research Center for the Natural and Applied Sciences and the Graduate School, University of Santo Tomas, Manila 1015, Philippines.
4. Institute of Biology, University of the Philippines Diliman, Quezon City 1101, Philippines.