Article
Plant Sciences
Chung-Chi Chen, Pei-Jie Meng, Chih-Hao Hsieh, Sen Jan
Summary: This study focuses on the variations of plankton community respiration (CR) and particulate organic carbon (POC) in the Kuroshio, and finds that the dynamics of picoplankton are associated with the changes in plankton CR and POC in this region.
Article
Environmental Sciences
Norbert Kamjunke, Liza-Marie Beckers, Peter Herzsprung, Wolf von Tumpling, Oliver Lechtenfeld, Joerg Tittel, Ute Risse-Buhl, Michael Rode, Alexander Wachholz, Rene Kallies, Tobias Schulze, Martin Krauss, Werner Brack, Sara Comero, Bernd Manfred Gawlik, Hello Skejo, Simona Tavazzi, Giulio Mariani, Dietrich Borchardt, Markus Weitere
Summary: This study investigated autotrophic processes, heterotrophic carbon utilization, and micropollutant concentrations in the River Elbe, Germany, using a Lagrangian sampling design. The results showed that under base flow conditions, there was an increase in phytoplankton biomass and photosynthesis from upstream to downstream, while concentrations of dissolved macronutrients decreased. Bacterial abundance and production increased less than in wetter years, and there were changes in bacterial community composition downstream. DOM components increased due to microbial production, while some pollutants showed higher concentrations downstream. However, their magnitudes were not distinctly different from conditions at medium discharges.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Joon Hai Lim, Choon Weng Lee, Chui Wei Bong, Isao Kudo
Summary: The study indicated that in the 2010-2011 period, the dissolved organic nitrogen concentration significantly increased at two tropical coastal sites in Peninsular Malaysia, resulting in a decrease in bacterial respiration rate and a slight improvement in bacterial growth efficiency.
MARINE POLLUTION BULLETIN
(2021)
Article
Oceanography
Xin Hu, Xiangfu Li, Maoqiu He, Aimin Long, Jie Xu
Summary: Heterotrophic bacteria in coral reefs are crucial for the carbon cycle and coral health. Environmental factors like temperature have significant effects on bacterial metabolic activity and community composition, potentially leading to coral disease and survival threats.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Ecology
Katrin Attermeyer, Astrid Harjung, Jakob Schelker, Gabriele Weigelhofer
Summary: The hyporheic zone plays a crucial role in carbon processing in stream ecosystems, but the drivers of microbial activity and carbon processing in this zone are not well understood. Our experiments showed that algal dissolved organic matter and inorganic phosphorus have significant impacts on microbial degradation of soil DOM in the hyporheic zone, but the effects of nutrient availability may vary among different streams. This study highlights the importance of nutrient pulses in stimulating microbial activity and carbon degradation in pristine streams.
FRESHWATER BIOLOGY
(2022)
Article
Environmental Sciences
Zequn Fan, Cuiling Jiang, Tahir Muhammad, Imran Ali, Yakun Feng, Lei Sun, Hui Geng
Summary: The accumulation of microplastics in freshwater ecosystems has a significant impact on greenhouse gas emissions from lake sediment by affecting sediment properties and microbial communities. A study showed that the addition of biodegradable microplastics led to a significant increase in carbon dioxide and methane emissions compared to conventional microplastics, due to the higher availability of dissolved organic carbon for microbial respiration. Furthermore, the emissions further increased with higher concentrations of biodegradable microplastics. These microplastics also altered the microbial community structure and increased the abundance of specific microbial groups, ultimately enhancing anaerobic respiration and exacerbating greenhouse gas emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Robert T. Letscher, Wei-Lei Wang, Zhou Liang, Angela N. Knapp
Summary: Marine dissolved organic phosphorus (DOP) plays an important role as a nutrient for marine autotrophs and contributes to the annual net community production (ANCP). This study used a global dataset of marine DOP to investigate the regional variability of DOP utilization by autotrophs contributing to ANCP. The results show that approximately 25% of ANCP is accumulated as DOP, with regional variations ranging from 8% to 50% across different biomes. Shallow export and remineralization of DOP in the subtropical regions contribute to the regeneration of phosphate within the upper thermocline, and the transport of DOP from net production regions to net consumption regions is facilitated by subtropical gyres.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Geosciences, Multidisciplinary
Na Li, Ruiying Chang, Hui Jiang, Akash Tariq, Jordi Sardans, Josep Penuelas, Feng Sun, Xingmei Zhou
Summary: The experiment on grazing-exclusion and climate warming effects in alpine meadows revealed that grazing-exclusion significantly decreased potential nitrogen mineralization, and climate warming could amplify the adverse effects of grazing-exclusion. Light-intensity grazing was beneficial for increasing soil enzyme activity and nitrogen mineralization in alpine meadows, providing important guidance for sustainable grazing management in the face of climate change.
Article
Environmental Sciences
Ismael Soria-Reinoso, Javier Alcocer, Salvador Sanchez-Carrillo, Felipe Garcia-Oliva, Daniel Cuevas-Lara, Daniela Cortes-Guzman, Luis A. Oseguera
Summary: This study aims to evaluate the spatial and seasonal changes of organic and inorganic carbon along the Usumacinta River and estimate the carbon fluxes into the southern Gulf of Mexico. The results show that organic carbon is mainly in the form of dissolved organic carbon (DOC) and its concentration is higher in the rainy season. Particulate carbon is positively related to total suspended solids, while inorganic carbon concentration is higher in the dry season.
Article
Environmental Sciences
Li Zhao, Sonia Brugel, Kesava Priyan Ramasamy, Agneta Andersson
Summary: Bacteria are important consumers of dissolved organic matter in aquatic systems. The response of bacterial communities to changing DOM types and inputs from climate change is not well understood.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Jia Shi, Jie Wang, Junfei Lv, Zi Wang, Yumei Peng, Jianying Shang, Xiang Wang
Summary: The effects of polyethylene (PE) and biodegradable polylactic acid (PLA) microplastics on soil organic matter (SOM) stability and bacterial community were examined in two contrasting soils under varying temperature conditions. Results showed that microplastics addition significantly increased CO2 emissions and dissolved organic carbon (DOC) contents, with PLA being more susceptible to elevated temperature compared to PE. The presence of microplastics also altered the spectral characteristics of DOC and affected the soil bacterial community. The findings suggest the non-ignorable effect of microplastics on soil organic matter stability and the need to consider the interaction between microplastics and soil environment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Zhang-mu Jing, Qing-qian Li, Yan-jie Wei, Bin Dong, Peng Yuan, Rui-xia Liu, Hong-jie Gao
Summary: Vegetation restoration projects can improve water quality and protect biodiversity. This study investigated the mechanism of protistan and bacterial community assembly processes in rivers with and without vegetation restoration. The results showed that both biotic and abiotic factors influenced the community assembly, and different DOM components guided bacterial and protistan competition.
ENVIRONMENTAL RESEARCH
(2023)
Article
Microbiology
Stephen Giovannoni, Francis Chan, Edward Davis, Curtis Deutsch, Sarah Wolf
Summary: Research suggests that enzymes involved in organic matter catabolism are kinetically limited by oxygen at concentrations much higher than those required for respiration. The proposed hypoxic barrier hypothesis may help explain why many ocean ecosystems rarely reach anoxic conditions, by highlighting the kinetic properties of oxygen-dependent reactions and their impact on ecosystem trajectories under oxygen stress.
Article
Environmental Sciences
Ting Sun, Zoe Lindo, Brian A. A. Branfireun
Summary: Climate change-driven ground warming will alter mercury cycling processes in high boreal and subarctic peatlands, particularly increasing MeHg production in subarctic peatlands. Increased soil temperature promotes microbial metabolism and organic matter turnover, resulting in higher concentrations of MeHg in the water.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Biology
Kangli Guo, Jie Chen, Jian Yuan, Xiaodong Wang, Shuaishuai Xu, Shengwei Hou, Yan Wang
Summary: This study analyzed the effects of temperature on carbon allocation in phytoplankton and the significance of TEP in the marine carbon pool. The results showed that increased temperature promotes DOC exudation and extracellular TEP formation, affecting carbon pool allocation in phytoplankton cells.
Article
Limnology
Fan-Sian Lin, Pei-Chi Ho, Akash R. Sastri, Chung-Chi Chen, Gwo-Ching Gong, Sen Jan, Chih-hao Hsieh
LIMNOLOGY AND OCEANOGRAPHY
(2020)
Article
Environmental Sciences
Chung-Chi Chen, Gwo-Ching Gong, Wen-Chen Chou, Fuh-Kwo Shiah
MARINE POLLUTION BULLETIN
(2020)
Article
Microbiology
Wan-Hsuan Cheng, Hsiao-Pei Lu, Chung-Chi Chen, Sen Jan, Chih-hao Hsieh
FRONTIERS IN MICROBIOLOGY
(2020)
Article
Limnology
Chung-Chi Chen, Gwo-Ching Gong, Kuo-Ping Chiang, Fuh-Kwo Shiah, Chih-Ching Chung, Chin-Chang Hung
Summary: The study found that the area of the Changjiang River plume and organic carbon consumption were positively correlated, with plankton community respiration decreasing as the plume area increased. Bacteria played a larger role in carbon consumption, despite phytoplankton biomass dominance. The ecosystem was heterotrophic, yet close to a state of carbon balance.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Chung-Chi Chen, Fuh-Kwo Shiah, Gwo-Ching Gong, Tzong-Yueh Chen
Summary: This study evaluates the simultaneous occurrences of phytoplankton blooms, hypoxia, and upwelling along the Zhejiang coast in the East China Sea. Upwelling uplifted bottom water to bring phytoplankton blooms and hypoxia, increasing the threat to marine life. High concentrations of nitrate and phosphate in the hypoxic regions may enhance phytoplankton blooms and worsen hypoxia.
MARINE POLLUTION BULLETIN
(2021)
Review
Oceanography
Jing-Ying Wu, Siou-Yan Lin, Shao-Hung Peng, Jia-Jang Hung, Chen-Tung Arthur Chen, Li-Lian Liu
Summary: The study compared the trophic structure and isotopic niche width of consumers in benthic communities around shallow-water hydrothermal vents (SVs) off Kueishan Islet with nearby non-vent rocky reefs (NV), finding that SVs had more diversified nutrient sources and differences in consumer feeding guilds. Additionally, the study revealed that plankton-derived production plays a significant role in providing food to benthic communities, especially in extreme conditions such as those found in SVs off Kueishan Islet.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Multidisciplinary Sciences
Jing-Ying Wu, Siou-Yan Lin, Shao-Hung Peng, Jia-Jang Hung, Chen-Tung Arthur Chen, Li-Lian Liu
Summary: The study presented carbon and nitrogen stable isotopes data from benthos in shallow-water hydrothermal vents and nearby non-vent rocky reefs in northeastern Taiwan, collected in 2009 and 2010. These data can be used to investigate food sources of consumers inhabiting shallow-water hydrothermal vent and rocky reef ecosystems in subtropical regions.
Article
Environmental Sciences
Chung-Chi Chen, Chun-Yi Lu, Sen Jan, Chih-hao Hsieh, Chih-Ching Chung
Summary: The intensity of coastal uplift along the subtropical region of eastern Taiwan is positively correlated to the flow volume transport of the Kuroshio current. The uplifted nutrients enhance the growth of phytoplankton and may support more energy transfer to higher trophic levels in this oligotrophic ecosystem.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Chung-Chi Chen, Dong S. Ko, Gwo-Ching Gong, Chun-Chi Lien, Wen-Chen Chou, Hung-Jen Lee, Fuh-Kwo Shiah, Yu-Sin Wita Huang
Summary: This study demonstrates the impact of upwelling on hypoxia and the ecosystem in the East China Sea. Upwelling increases the extent of hypoxic water and promotes phytoplankton growth in the region. It also provides a suitable environment and ventilation to alleviate low-oxygen stress in the hypoxic area.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Chung-Chi Chen, Hung-Yen Hsieh, Anderson B. Mayfield, Chia-Ming Chang, Jih-Terng Wang, Pei-Jie Meng
Summary: The coral reef ecosystem in Kenting National Park is mainly impacted by increased nutrient levels and reduced salinity during the summer rainy season. Cluster analysis suggests that nutrient influx is mainly attributed to local discharge outlets near villages and hotels. Efforts are needed to control tourist numbers, treat waste water discharge, and strengthen land protection facilities.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Oceanography
Ariana Chih-Hsien Liu, Feng-Hsun Chang, Jinny Wu Yang, Hiroaki Saito, Yu Umezawa, Chung-Chi Chen, Sen Jan, Chih-hao Hsieh
Summary: This study investigated the diversity and taxonomic composition of free-living bacterioplankton along the Kuroshio. The results showed that temperature, phosphate concentration, and chlorophyll-a concentration were important factors affecting the diversity and composition of bacterioplankton.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Environmental Sciences
Yi-Chen Cheng, Sen Jan, Chung-Chi Chen
Summary: Swordtip squid is a commercially important species in the southern East China Sea. Its annual catch per unit effort (CPUE) is influenced by temperature anomalies and the intrusion of warm water from the Kuroshio current. A warmer environment favors recruitment and catch of swordtip squid, while the intrusion of warm water benefits the growth of larvae, maintaining a certain level of CPUE. The blocking of the Kuroshio intrusion due to cold and less salty China Coastal Water in certain years resulted in anomalously low CPUE. Evaluating the dominance of warm Kuroshio water and cold shelf water can help predict annual catches of swordtip squid.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Plant Sciences
Chung-Chi Chen, Pei-Jie Meng, Chih-Hao Hsieh, Sen Jan
Summary: This study focuses on the variations of plankton community respiration (CR) and particulate organic carbon (POC) in the Kuroshio, and finds that the dynamics of picoplankton are associated with the changes in plankton CR and POC in this region.
Article
Environmental Sciences
Jia-Jang Hung, Wan-Tzu Lu, Hsin-Mei Yang, Yen-Hui Lin, Laodong Guo
Summary: This study examines the physical and biogeochemical processes that determine the distribution of dissolved organic matter (DOM) and chromophoric dissolved organic matter (CDOM) in the Taiwan Strait. The study highlights the importance of seasonal and spatial variations, as well as the impact of freshwater input and water flow on the ecosystem of the strait.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Ecology
Jia-Jang Hung, Ching-Han Tung, Zong-Ying Lin, Yuh-ling Lee Chen, Shao-Hung Peng, Yen-Huei Lin, Li-Shan Tsai
Summary: This study presents measured active and passive fluxes of C, N, and P in the northern South China Sea, finding that active fluxes are mainly influenced by seasonal surface changes and event-driven factors, while passive fluxes are primarily driven by nutrient availability.