Search

Dokdo Island's diverse marine ecosystem requires long-term monitoring to understand the effects of rapid environmental changes, such as global warming, on macrobenthos species and communities. Current studies are often short-term and limited, highlighting the need for extended research to predict future changes to ecosystems. This study analyzed the environmental variables influencing macrobenthos through long-term monitoring. In total, 511 species (spp./23.4 m2) were identified with an abundance of 1709.9 individuals/m2 and a diversity of 2.9. Since 2020, there has been a decline in both the number of species and diversity, attributed to changes in sediment composition, particularly an increase in gravel and sand. The dominant species include the crustacean Abludomelita denticulata (17.6%), the polychaete Haplosyllis spongiphila (6.8%), the bivalve Glycymeris munda (5.6%), the polychaete Opisthodonta uraga (5.3%), and the bivalve Limatula japonica (3.8%). The macrobenthos community differs each year, as the dominant species G. munda has decreased in abundance since 2022 and L. japonica since 2021. Depth and gravel sediment strongly correlated with community variation. Site-specific analysis also showed significant differences, with depth, bottom temperature, and sediment composition as the influencing factors. These species thrive in cold water but their abundance declines with an increase in temperature. Continuous long-term monitoring is essential to understand and protect the Dokdo ecosystem amid rapid environmental changes. Long-term monitoring studies have revealed more species than have short-term studies, showing annual and site-specific environmental changes, including sediment erosion and bottom temperature increases. These changes have affected macrobenthos diversity, abundance, and community composition, necessitating ongoing research to determine the persistence of these trends and to protect the ecosystem. [ABSTRACT FROM AUTHOR]

Objective: To find cumulative recurrence rate and risk factors for recurrence in young women with mature cystic teratoma (MCT). Methods: Patients aged 10–29 years with MCT confirmed by their first ovarian surgery between 2000 and 2018 were included in the study. To rule out residual lesions, only patients with no MCT‐suspected lesions on imaging within 1 year after surgery were included in the study. Patients who had not undergone imaging tests from 1 year after surgery or had other findings on biopsy were excluded. Results: The present study included 372 (84.2%) patients with cystectomy and 70 (15.8%) patients with oophorectomy. The 5‐year cumulative recurrence rates for each patient group were 11.2% and 20.3%, respectively. The hazard rate of recurrence was higher in the oophorectomy group than the cystectomy group within 5 years after surgery. Large tumor size (hazard ratio [HR] 2.59; 95% confidence interval [CI] 1.11–6.08) and bilaterality (HR 2.65; 95% CI 1.27–5.52) were significant predictors of recurrence in the cystectomy group. Conclusion: The 5‐year cumulative recurrence rate after surgery in young women with ovarian MCT was 11.2% in the cystectomy group and 20.3% in the oophorectomy group. Risk factors for recurrence after cystectomy were large tumor size and bilaterality. Synopsis: The 5‐year recurrence rates after cystectomy and oophorectomy in young women for mature cystic teratoma were 11.2% and 20.3%, respectively. [ABSTRACT FROM AUTHOR]