TY - RPRT TI - The role of mangroves on the bioaccumulation and citogenotoxic effects of metals and pesticides on the food web of a tropical coastal system AU - Chan, Shek Kiu AU - Tagulao, Karen CY - Macao DA - 2016/// PY - 2016 M3 - Research Report PB - University of Saint Joseph ER - TY - RPRT TI - The role of mangroves on the bioaccumulation and citogenotoxic effects of metals and pesticides on the food web of a sub-tropical coastal system AU - Chan, Shek Kiu AU - Tagulao, Karen CY - Macao DA - 2018/// PY - 2018 M3 - Research Report PB - University of Saint Joseph ER - TY - JOUR TI - Environmental characterization of 4,4′-dichlorobenzophenone in surface waters from Macao and Hong Kong coastal areas (Pearl River Delta) and its toxicity on two biological models: Artemia salina and Daphnia magna AU - Ivorra, Lucia AU - Cardoso, Patricia G. AU - Chan, Shek Kiu AU - Tagulao, Karen AU - Cruzeiro, Catarina T2 - Ecotoxicology and Environmental Safety DA - 2019/04// PY - 2019 DO - 10.1016/j.ecoenv.2018.12.054 DP - DOI.org (Crossref) VL - 171 SP - 1 EP - 11 J2 - Ecotoxicology and Environmental Safety LA - en SN - 01476513 ST - Environmental characterization of 4,4′-dichlorobenzophenone in surface waters from Macao and Hong Kong coastal areas (Pearl River Delta) and its toxicity on two biological models UR - https://linkinghub.elsevier.com/retrieve/pii/S0147651318313472 Y2 - 2022/11/09/10:05:07 ER - TY - JOUR TI - Quantification of insecticides in commercial seafood sold in East Asian markets: risk assessment for consumers AU - Ivorra, Lucia AU - Cardoso, Patricia G. AU - Chan, Shek Kiu AU - Cruzeiro, Catarina AU - Tagulao, Karen T2 - Environmental Science and Pollution Research AB - The extraction of 21 insecticides and 5 metabolites was performed using an optimized and validated QuEChERS protocol that was further used for the quantification (GC–MS/MS) in several seafood matrices (crustaceans, bivalves, and fish-mudskippers). Seven species, acquired from Hong Kong and Macao wet markets (a region so far poorly monitored), were selected based on their commercial importance in the Indo-Pacific region, market abundance, and affordable price. Among them, mussels from Hong Kong, together with mudskippers from Macao, presented the highest insecticide concentrations (median values of 30.33 and 23.90 ng/g WW, respectively). Residual levels of fenobucarb, DDTs, HCHs, and heptachlors were above the established threshold (10 ng/g WW) for human consumption according to the European and Chinese legislations: for example, in fish-mudskippers, DDTs, fenobucarb, and heptachlors (5-, 20- and tenfold, respectively), and in bivalves, HCHs (fourfold) had higher levels than the threshold. Risk assessment revealed potential human health effects (e.g., neurotoxicity), especially through fish and bivalve consumption (non-carcinogenic risk; ΣHQLT > 1), and a potential concern of lifetime cancer risk development through the consumption of fish, bivalves, and crustaceans collected from these markets (carcinogenic risk; ΣTCR > 10–4). Since these results indicate polluted regions, where the seafood is collected/produced, a strict monitoring framework should be implemented in those areas to improve food quality and safety of seafood products. DA - 2023/03/01/ PY - 2023 DO - 10.1007/s11356-022-24413-7 DP - Springer Link VL - 30 IS - 12 SP - 34585 EP - 34597 J2 - Environ Sci Pollut Res LA - en SN - 1614-7499 ST - Quantification of insecticides in commercial seafood sold in East Asian markets UR - https://doi.org/10.1007/s11356-022-24413-7 Y2 - 2023/04/11/08:10:49 KW - Bivalves KW - Crustaceans KW - Health risk assessment KW - Mudskippers KW - Organochlorine pesticides ER - TY - JOUR TI - Uptake and depuration kinetics of dicofol metabolite 4,4′-dichlorobenzophenone, in the edible Asiatic clam Meretrix meretrix AU - Ivorra, Lucia AU - Cruzeiro, Catarina AU - Chan, Shek Kiu AU - Tagulao, Karen Araño AU - Cardoso, Patricia G. T2 - Chemosphere AB - Uptake and depuration kinetics of 4,4′-dichlorobenzophenone (main metabolite of dicofol) in the edible clam Meretrix meretrix were evaluated through a mesocosm experiment. M. meretrix was exposed to different dicofol concentrations (environmental concentration, D1 = 50 ng/L; supra-environmental concentration, D2 = 500 ng/L) for 15 days, followed by the same depuration period. To accomplish this goal, an analytical method was successfully optimized for 4,4′-DCBP using QuEChERS as extraction method with a range of concentrations 0.3–76.8 ng/g ww quantified by gas chromatography coupled to tandem mass spectrometry. Our results demonstrated different kinetics of accumulation depending on the two dicofol treatments. For D1, the uptake kinetic was best fitted using a plateau followed by one phase association kinetic model, while for D2 a one phase association kinetic model suited better. Similar bioconcentration factors were obtained for both concentrations but only animals exposed to D2, showed 4,4′-DCBP levels above the limits of quantification after 24 h exposure. These animals also showed lower uptake rate (ku) than organisms exposed to D1. During the depuration period, only organisms exposed to D1 successfully depurated after 24 h. On the other hand, although animals exposed to D2 presented higher elimination factor, they did not reach the original levels after depuration. Moreover, values detected in these clams were higher than the Maximum Residue Level (10 ng/g) established by the European legislation. This indicates that longer periods of depuration time than the ones used in this study, may be needed in order to reach safe levels for human consumption. This work also demonstrated that studies on metabolite kinetics during uptake/depuration experiments, could be a new alternative to understand the impact and metabolism of pesticides in the marine environment. DA - 2019/11/01/ PY - 2019 DO - 10.1016/j.chemosphere.2019.06.155 DP - ScienceDirect VL - 235 SP - 662 EP - 669 J2 - Chemosphere LA - en SN - 0045-6535 UR - https://www.sciencedirect.com/science/article/pii/S0045653519313967 Y2 - 2022/11/09/10:10:30 KW - Bivalves KW - GC-MS/MS KW - Organochlorine pesticides KW - QuEChERS bioconcentration KW - Seafood ER - TY - JOUR TI - Can mangroves work as an effective phytoremediation tool for pesticide contamination? An interlinked analysis between surface water, sediments and biota AU - Ivorra, Lucia AU - Cardoso, Patricia G. AU - Chan, Shek Kiu AU - Cruzeiro, Catarina AU - Tagulao, Karen Arano T2 - Journal of Cleaner Production AB - Mangroves are a unique group of plants growing along tropical and sub-tropical coastlines, with the ability to remove several types of contaminants such as heavy metals and other persistent organic compounds in coastal waters. However, little attention has been given to the possible role of mangroves in the removal of organochlorinated pesticides (OCPs) from the environment. Used worldwide, these pesticides were banned in the late 80s, withal they can still be quantified in aquatic environments due to their high stability. Moreover, as persistent and lipophilic compounds, OCPs are known for their tendency to bioaccumulate and biomagnify through the food chain, affecting local ecosystems, and potentially human health. This work aimed to investigate the potential benefits of mangrove ecosystems as OCP phytoremediators. For this purpose, a total of seventy-three articles from non-mangrove and mangrove areas around the world were gathered, integrated and re-analysed as a whole. These data include information from four different matrices (water, sediment, benthic fauna and mangrove plants). A common trend of less pesticide contamination in mangrove areas was observed for all the selected matrices. As a complement, average concentrations were discussed considering International Directives, such as the European legislation 2013/39/EU for water policy and the Dutch List together with the International Sediment Quality Guideline, for sediments. Additionally, theoretical risk assessments were also included. Since information regarding OCPs in mangroves ecosystem is very scarce compared to non-mangrove areas, this review provides valuable insights regarding these environments, and the importance of preserving them as a relevant remediation unit. DA - 2021/05/01/ PY - 2021 DO - 10.1016/j.jclepro.2021.126334 DP - ScienceDirect VL - 295 SP - 126334 J2 - Journal of Cleaner Production LA - en SN - 0959-6526 ST - Can mangroves work as an effective phytoremediation tool for pesticide contamination? UR - https://www.sciencedirect.com/science/article/pii/S0959652621005540 Y2 - 2023/04/11/08:13:55 KW - Benthic fauna KW - Intertidal environments KW - Organochlorinated pesticides KW - Persistent organic compounds KW - Toxicological assessment ER - TY - JOUR TI - Use of stable isotopes to understand food webs in Macao wetlands AU - Chen, Qian AU - Liu, Yang AU - Ho, Wei-Tim AU - Chan, Shek Kiu AU - Li, Qiu-hua AU - Huang, Jian-Rong T2 - Wetlands Ecology and Management AB - In this study, components of the food-web in Macao wetlands were quantified using stable isotope ratio techniques based on carbon and nitrogen values. The δ13C and δ15N values of particulate organic matter (δ13CPOM and δ15NPOM, respectively) ranged from −30.64 ± 1.0 to −28.1 ± 0.7 ‰, and from −1.11 ± 0.8 to 3.98 ± 0.7 ‰, respectively. The δ13C values of consumer species ranged from −33.94 to −16.92 ‰, showing a wide range from lower values in a freshwater lake and inner bay to higher values in a mangrove forest. The distinct dietary habits of consumer species and the location-specific food source composition were the main factors affecting the δ13C values. The consumer 15N-isotope enrichment values suggested that there were three trophic levels; primary, secondary, and tertiary. The primary consumer trophic level was represented by freshwater herbivorous gastropods, filter-feeding bivalves, and plankton-feeding fish, with a mean δ15N value of 5.052 ‰. The secondary consumer level included four deposit-feeding fish species distributed in Fai Chi Kei Bay and deposit-feeding gastropods in the Lotus Flower Bridge flat, with a mean δ15N value of 6.794 ‰. The tertiary consumers group consisted of four crab species, one shrimp species, and four fish species in the Lotus Flower Bridge Flat, with a mean δ15N value of 13.473 ‰. Their diet mainly comprised organic debris, bottom fauna, and rotten animal tissues. This study confirms the applicability of the isotopic approach in food web studies. DA - 2017/02/01/ PY - 2017 DO - 10.1007/s11273-016-9502-2 DP - Springer Link VL - 25 IS - 1 SP - 59 EP - 66 J2 - Wetlands Ecol Manage LA - en SN - 1572-9834 UR - https://doi.org/10.1007/s11273-016-9502-2 Y2 - 2021/02/10/09:01:46 ER - TY - THES TI - SURVIVAL, MORPHOLOGY AND REPRODUCTION OF ENHALUS ACOROIDES (L.f.) ROYLE IN THE BOLINAO-ANDA REEF SYSTEM, NW PHILIPPINES: EFFECTS OF VARYING LIGHT CONDITIONS AU - Tagulao, Karen Araño A3 - Chan Shek Kiu A3 - Rollon, Rene A3 - University of Saint Joseph AB - Seagrasses play a critical role in coastal ecosystems worldwide, providing various ecosystem services based on their region and genus. In Southeast Asia, where seagrass biodiversity and extents are at their highest, the livelihoods and food security of many coastal communities depend on these plants. Despite their ecological and economic importance, seagrasses face global threats from human activities such as pollution and land use changes. Enhalus acoroides, a widely distributed seagrass species in the tropical Indo-Pacific region, is particularly valuable for coastal management and conservation efforts due to its size and provision of various ecosystem services. Although previous research has indicated that it is less sensitive to environmental changes than other tropical seagrass species, recent reports highlight its vulnerability to siltation and eutrophication. This dissertation aimed to examine how Enhalus responds and adapts to changes in light availability, taking into account both morphological adaptation and phenotypic plasticity. Field surveys, reciprocal transplantation field experiments, and investigations of sexual reproductive effort were conducted in the Bolinao-Anda Reef system (NW Philippines) to evaluate the impact of long-term environmental changes on Enhalus populations. The findings of this study revealed that Enhalus has the capacity to adapt its traits and survive changes in depth, light gradients, and different habitat types. This is evidenced by larger shoots in low-light environments, which is apparently a response to the reduction in light availability, as evidenced in both in situ and experimental setups. Larger leaf surface area in light-reduced setups also had higher concentration of chlorophylls a and b pigments. Transplants from light-reduced environments, although morphologically large, appeared more vulnerable (with low survival values) to environmental changes associated with translocation. Being morphologically large is therefore likely a stress response to light reduction, allocating more energy on light harvesting than sexual reproduction. Reciprocal transplantation experiments indicated a high survival rate, suggesting the potential of Enhalus for use in rehabilitation. However, despite having wider plasticity to adapt to light-limitation, they can be wiped out when threshold is reached. This thesis underscores the need for further research on Enhalus' response to stressors, genetic variation, and adaptive capacity to address conservation and management challenges CN - M-SC 2023 TAG,KAR CY - Macau DA - 2023/// PY - 2023 DP - Library Catalog (Koha) SP - 171 PB - University of Saint Joseph ST - SURVIVAL, MORPHOLOGY AND REPRODUCTION OF ENHALUS ACOROIDES (L.f.) ROYLE IN THE BOLINAO-ANDA REEF SYSTEM, NW PHILIPPINES UR - https://library-opac.usj.edu.mo/cgi-bin/koha/opac-detail.pl?biblionumber=216034 KW - Enhalus acoroides KW - Thesis and Dissertations PhD in Science (D-SC) KW - University of Saint Joseph KW - light availability KW - phenotypic plasticity KW - seagrass KW - transplantation ER -