Tay Hui Xin Serene
Email Address
ceethxs@nus.edu.sg
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Publication Tropical Marine and Brackish Ecosystems(CAB International, 2019-01-01) Ooi Seng Keat; Tanzil, Jani TI; Tay, Serene HX; Ow, Yan Xiang; Chua, Siew Chin; Clews, Esther; Bolton, Annette; Raghavan, Srivatsan; Liong, Shie-Yui; Dr Chua Siew Chin; RIDGE VIEW RESIDENTIAL COLLEGE; TROPICAL MARINE SCIENCE INSTITUTEPublication Diet and mitochondrial DNA haplotype of a sperm whale (Physeter macrocephalus) found dead off Jurong Island, Singapore(PeerJ, 2019-04-05) CHUA AIK HWEE MARCUS; DAVID J.W. LANE; Ooi Seng Keat; TAY HUI XIN SERENE; TSUNEMI KUBODERA; LEE KONG CHIAN NATURAL HISTORY MUSEUMDespite numerous studies across the large geographic range of the sperm whale (Physeter macrocephalus), little is known about the diet and mitochondrial DNA haplotypes of this strongly female philopatric species in waters off Southeast Asia. A female sperm whale found dead in Singapore waters provided the opportunity to study her diet and mitochondrial DNA haplotype. Here we report on the identification of stomach contents and mitochondrial DNA haplotype of this individual, and we include coastal hydrodynamic modelling to determine the possible geographic origin of the whale. At least 28 species of prey were eaten by this adult female whale, most of which were cephalopods. The mesopelagic squids Taonius pavo, Histioteuthis pacifica, Chiroteuthis imperator,and Ancistrocheirus lesueurii made up over 65% of the whale’s stomach contents. Plastic debris was also found in the whale’s stomach. Based on the diet, genetics, and coastal hydrodynamic modelling that suggest an easterly drift of the whale carcass over several days, the dead sperm whale in Singapore probably originated from a pod in the Southern Indian Ocean. This study provides an increase in the understanding the diet and natural history of the sperm whale in Southeast Asia. The combined analyses of stomach contents, DNA, and hydrodynamic modeling could provide a context to future studies on the sperm whale strandings, and have broader applicability for other marine mammals in the region.Publication Monsoonal variations of lead (Pb) in coastal waters around Singapore(PERGAMON-ELSEVIER SCIENCE LTD, 2022-06-01) Chen, Mengli; Carrasco, Gonzalo; Park, Edward; Morgan, Kyle; Tay, Serene Hui Xin; Tanzil, Jani; Ooi, Seng Keat; Zhou, Kuanbo; Boyle, Edward A; Dr Jani Thuaibah Isa Tanzil; CIVIL AND ENVIRONMENTAL ENGINEERING; TROPICAL MARINE SCIENCE INSTITUTEAnthropogenic lead (Pb) has been the overwhelming Pb source to the global ocean, primarily contributed from Pb gasoline and industrial emissions. However, since Pb gasoline has been phased out globally, questions about whether there was a decrease in seawater Pb concentration, or if there are other sources taking over remains unclear in Southeast Asia. Here, combining Pb concentrations in seawater from Singapore Strait in 2010–2017; trap sediment in 2018–2019; and the previously published coral reconstruction covering 1975–2010; we found that the seawater Pb concentration in Singapore Strait over past decades followed the regional gasoline emissions, and no additional major source had contributed the Pb in the seawater since ~2010. The present-day Pb in Singapore Straits' water mainly follows the monsoonal current reversals, with variable degrees of scavenging that peak in inter-monsoon season. Minor Pb sources still contribute to some local-scale variabilities, despite a decadal-scale decreasing trend of Pb in seawater.Publication Analyzing the physics of non-tidal barotropic sea level anomaly events using multi-scale numerical modelling in Singapore regional waters(ELSEVIER, 2015-09-01) Kurniawan, Alamsyah; Tay, Serene Hui Xin; Ooi, Seng Keat; Babovic, Vladan; Gerritsen, Herman; Assoc Prof Vladan Babovic; CIVIL AND ENVIRONMENTAL ENGINEERING; TROPICAL MARINE SCIENCE INSTITUTE© 2015 International Association for Hydro-environment Engineering and Research, Asia Pacific Division. The hydrodynamic flows in the Singapore regional waters (SRW) are the result of a complex mix of tide, seasonal and meteorological effects. The study of non-tidal effects or sea level anomalies (SLA) in this region has shown that it is possible to model some of these anomalies. The present study addresses the non-tidal barotropic water levels and currents in the Singapore region in detail. This analysis includes a multi-scale approach, and addresses amongst others hydrodynamic model grid resolution and the importance of resolving non-linear tide-surge interaction. The results show that the water level and current anomalies phenomena in a complex region like SRW can be effectively modelled using an approach combining non-tidal barotropic and multi-scale numerical modelling. A detailed investigation of the levels of non-linear tide-surge interaction is carried out by simulating SLA events in the Singapore regional waters during North-East (positive SLA) and South-West (negative SLA) monsoons based on ECMWF numerical weather forcing conditions. The results of combining both approaches suggest that the finer grid resolution improves the accuracy of water level and current anomalies simulations. Furthermore, the results also indicate that for the simulations of non-tidal barotropic flows in this area, non-linear tide-surge interaction is important and should be taken into account. Finally, the behaviour of the non-tidal barotropic flow in the region and its changes with tidal variation in the shallow region of the Singapore Strait is now much better understood. Therefore, for reliable operational forecast of sea level, the inclusion of non-linear tide-surge interaction should be required in numerical models to reproduce both tides and surges with improved accuracy in this region.