http://scholars.ntou.edu.tw/handle/123456789/198 2026-04-25T04:00:22Z 2026-04-25T04:00:22Z Chen, Yi-Jung Chou, Wen-Chen Tseng, Hsiao-Chun Shiu, Ruei-Feng Lee, Meng-Chou Nan, Fan-Hua Yeh, Han-Yang http://scholars.ntou.edu.tw/handle/123456789/26545 2026-03-16T08:29:24Z 2025-01-01T00:00:00Z

標題: Biogenic CO₂, CH₄, and N₂O emissions from abalone culture in tidal ponds 作者: Chen, Yi-Jung; Chou, Wen-Chen; Tseng, Hsiao-Chun; Shiu, Ruei-Feng; Lee, Meng-Chou; Nan, Fan-Hua; Yeh, Han-Yang 摘要: Abalone is among the most highly prized seafoods, valued for its delicate flavor and texture. As abalone aquaculture continues to expand, addressing its environmental impacts has become increasingly important. Although aquaculture is recognized as a contributor to greenhouse gas (GHG) emissions, the specific mechanisms and pathways of GHG emissions-particularly in abalone farming-remain poorly understood. To clarify the patterns and drivers of GHG emissions in abalone (Haliotis discus) culture systems, this study was conducted in three aquaculture ponds located in Gongliao District, New Taipei City, Taiwan. We measured CO2, CH4, and N2O fluxes along with key environmental parameters to assess variation across sampling locations, times, and seasons. The results showed that sampling time had no significant effect on GHG flux variations, whereas seasonal changes influenced all three gases, and sampling location significantly affected N2O flux only. During the culture period, average fluxes were 2.19 +/- 10.83 mmol m-2 day-1 for CO2, 2.11 +/- 2.81 mu mol m-2 day-1 for CH4, and 1.65 +/- 2.73 mu mol m-2 day-1 for N2O, indicating that the abalone ponds served as net sources of these GHGs. When converted to CO2-equivalents (CO2-eq), the total average CO2-eq flux from the ponds was 0.02 +/- 0.09 mg CO2-eq m-2 day-1, calculated using global warming potential (GWP20 and GWP100) metrics. This study provides the first comprehensive assessment of GHG emissions in abalone pond systems and offers valuable insights into their emission dynamics. The findings contribute to the scientific basis needed to improve aquaculture GHG inventories.

2025-01-01T00:00:00Z Olivia, Madeline Wu, Wen-Huai Tsai, An-Yi Hsu, Hung-Chu Gong, Gwo-Ching Shiu, Ruei-Feng http://scholars.ntou.edu.tw/handle/123456789/26519 2026-03-12T03:37:04Z 2025-01-01T00:00:00Z

標題: Microplastics affect marine snow formation and sinking to the ocean's interior 作者: Olivia, Madeline; Wu, Wen-Huai; Tsai, An-Yi; Hsu, Hung-Chu; Gong, Gwo-Ching; Shiu, Ruei-Feng 摘要: Microplastics (MPs) are ubiquitous in the ocean and increasingly found embedded within marine snow (MS), organic-rich particle aggregates that play a central role in vertical carbon and MP flux. This study combined laboratory and onboard incubations to investigate how MPs influence the formation and sinking behavior of MS aggregates. Our data indicated that MPs significantly enhanced MS aggregation in both settings, likely by providing hydrophobic interfaces that promote entanglement and adhesion with organic matter. The polymer density and morphology of MPs further modulated aggregate sinking dynamics and structure. Dense polyethylene terephthalate (PET) pellets formed fast-sinking aggregates, whereas buoyant polyethylene (PE) and fibrous PET formed looser, slower-sinking structures. These differences often resulted in sinking rates lower than theoretical predictions, especially for larger and more irregular aggregates. Our findings suggest that MP incorporation into MS can enhance aggregate production, alter settling rates, and facilitate MP entry into food webs, with potential consequences for carbon transport and marine ecosystems.

2025-01-01T00:00:00Z Lee, Pei-, I Wu, Chia-Yi http://scholars.ntou.edu.tw/handle/123456789/26518 2026-03-12T03:37:04Z 2025-01-01T00:00:00Z

標題: A feasibility study of an AI-based virtual human training design in suicide gatekeeper education 作者: Lee, Pei-, I; Wu, Chia-Yi 摘要: Background: Suicide gatekeeper training is a preventive approach that equips nonprofessionals with the knowledge and skills to recognize and minimize suicide risks. AI-based virtual human technology offers an innovative way to deliver the training via immersive and interactive learning experiences. Objective: The study evaluated the acceptability and practicality of using Virti (R) virtual human simulation technique to design a Question-Persuade-Referral communication training and explored university students' learning experiences and feedback of the design. Design: Both qualitative and quantitative findings reflected Virti (R) learning outcomes. User satisfaction and confidence of Virti and suicide gatekeeper knowledge were measured along with semistructured inquiries collecting the learning experiences. Virti (R) was implemented in a 3-hour gatekeeper training session, including classroom teaching (1.5h) and Virti (R) practice (1.5h) via mobile or tablet.ResultsFifty-three undergraduates participated in the study (average age 19.2). The post-training score of the item, I become better understood that gatekeeper care is essential." was rated the highest (Mean=8.23SD=1.68) while "confidence in acting as a suicide gatekeeper" rated the lowest (Mean=5.82 SD=2.41). Three themes emerged through student feedback: Enhancing communication skills and confidence; perceived value and educational potential of Virti (R); and technical limitations and improvement of Virti (R). Conclusion: The study validated that AI-based Virti (R) scenarios were feasible for suicide gatekeeper training and communication skills promotion. Addressing technical issues may further strengthen user confidence."

2025-01-01T00:00:00Z Ho, Pei-Chi Chen, Chia-Ting Okuda, Noboru Wang, Pei-Ling Gong, Gwo-Ching Hsieh, Chih-hao http://scholars.ntou.edu.tw/handle/123456789/26511 2026-03-12T03:37:01Z 2025-01-01T00:00:00Z

標題: Nutrient supply, prey body size and biomass determine the trophic structures in marine plankton food webs 作者: Ho, Pei-Chi; Chen, Chia-Ting; Okuda, Noboru; Wang, Pei-Ling; Gong, Gwo-Ching; Hsieh, Chih-hao 摘要: Trophic diversity and predator-prey mass ratio (PPMR) are key indicators of trophic transfer pathways and efficiency in marine ecosystems. Horizontal trophic diversity reflects the variety of resources at the base of the planktonic food web, whereas vertical trophic diversity represents the maximum food chain length. In sizestructured marine food webs, community PPMR indicates the general prey size preference of zooplankton. In this study, we used size-fractionated stable isotope analyses (delta 13C and delta 15N) to assess horizontal and vertical trophic diversity and community PPMR, examining how nutrient supply influences the biomass and body size distribution of prey communities, and in turn affects size-structured trophic interactions. Our long-term monitoring across a nutrient gradient revealed that higher nutrient concentrations increased horizontal trophic diversity, suggesting that zooplankton exhibit more diverse prey preferences across size classes. Conversely, an increase in large autotrophic microplankton reduced vertical trophic diversity, indicating a shift in mesozooplankton feeding from heterotrophic microplankton to autotrophs, thereby shortening the food chain. In regions with low autotrophic microplankton biomass, community PPMR decreased with increasing total prey biomass, implying that mesozooplankton preferentially fed on heterotrophic microzooplankton in picoplanktondominated, high-productivity systems. These findings highlight how nutrient availability shapes size-structured plankton food webs by altering the biomass and size composition of prey communities.

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