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Feeding Selectivity of Calanoid Copepods on Phytoplankton in Jangmok Bay, South Coast of Korea
장민철,이동섭,노일,신경순 한국해양과학기술원 2010 Ocean science journal Vol.45 No.2
Grazing impacts of calanoid copepods on sizefractionated phytoplankton biomass [chlorophyll (Chl)-a] were measured in Jangmok Bay, Geoje Island, Korea, monthly from November 2004 to October 2005. The ingestion rate of calanoid copepods on total phytoplankton biomass ranged between 1 and 215 ng Chl-a copepod-1 day-1 during bottle incubations. Results indicated that microphytoplankton (> 20 μm) was the primary food source for calanoid copepods in grazing experiments on 3 phytoplankton size categories (< 3 μm, 3-20 μm, and > 20 μm). The ingestion rate on microphytoplankton showed a significant increase (r = 0.93, p < 0.01) with Chl-a concentration. Nanophytoplankton (3-20 μm) showed a negative ingestion rate from June 2005 to October 2005, but the reason is not completely understood. Calanoid copepods were unable to feed efficiently on picophytoplankton (< 3 μm) due to unfavorable size. Calanoid copepods removed between 0.1% and 27.7% (average, 3.6 ± 15.8%) of the phytoplankton biomass daily during grazing experiments. Grazing pressure was high in winter and early spring (January-March: 15.6-27.7%), while low in summer (June-August: -33.1-0.0%) and autumn (September–November: -1.4-5.1%). Results suggest that calanoid copepods play an important role in controlling the biomass and size structure of phytoplankton in winter and early spring.
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Summary of the 2024 Fall Conference of the Korean Pain Research Society
장민철 대한통증연구학회 2024 International Journal of Pain Vol.15 No.2
The 2024 fall conference of the Korean Pain Research Society (KPRS) took place on October 13 at Samsung Medical Center's Cancer Hospital in Seoul, South Korea. Founded as the Korean chapter of the International Association for the Study of Pain (IASP), KPRS serves as a multidisciplinary hub for advancing pain research and treatment strategies. The conference featured a comprehensive array of presentations, covering various aspects of pain diagnosis, management, and rehabilitation. Key topics included lumbar spinal pain, its mechanisms, and both surgical and non-surgical treatments. Experts discussed innovative surgical techniques such as endoscopic spine decompression and minimally invasive procedures, alongside the importance of evidence-based postoperative rehabilitation approaches. Advancements in neuropathic pain were highlighted, focusing on cellular mechanisms, drug delivery systems, and neuroregenerative strategies. The conference also explored non-surgical interventions, such as epidural and nerve block procedures, emphasizing safe and effective pain management techniques. Furthermore, experts examined the connection between spinal disorders and abdominal or pelvic pain, presenting differential diagnostic and interventional strategies. The event underscored the significance of a multidisciplinary approach, promoting collaboration among specialists in neurosurgery, anesthesiology, pain medicine, rehabilitation medicine, and basic sciences. The KPRS remains dedicated to fostering academic exchange and innovation to advance the field of pain management and research.
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