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Objectives: This study aims to describe the experience and practice of an intervention process for mental health crisis with 14,093 students living in a suddenly quarantined campus during the COVID‐19 pandemic. Methods: An expert committee of psychiatrists, psychologists and student counsellors was formed to manage the psychological crisis experienced by students. The committee provided online and onsite support, disclosed timely information, attended various online courses and facilitated various activities. Using the PHQ‐9, GAD‐7 and ISI scales, psychological weekly reports, student files and emergencies, students who were likely to have a crisis event were screened, and their degree of crisis was evaluated. A "one person–one case–one team" intervention was conducted for high‐risk students. Results: Of the 14,093 students, 11,121 finished all three online questionnaires. Based on the results of the screening tests, 732 students were placed in the prioritised attention group, 293 in the crisis group and 33 (10 [3.41%] male and 23 [7.85%] female) showed severe suicidal intentions. In total, 186 (3.26%) students declared poor sleep quality, while 610 (10.05%) students were found to have depression. The number of students affected with generalised anxiety was 650 (10.77%). Clinical intervention was successful with no untoward incidents. Conclusions: With strong support from the government, and the cooperation between multidisciplinary experts and the comprehensive intervention programme, the study obtained positive results. However, the limitations include the partial online survey responses and incomplete records of intervention. Nevertheless, the findings of this study could provide a foundation for further research. [ABSTRACT FROM AUTHOR]

A mesocosm study illuminated possible transfer pathways for dissolved organic carbon from the water column to zooplankton. Organic carbon was added as 13C enriched glucose to 15 mesocosms filled with natural lake water. Stable isotope analysis and phospholipid fatty acids-based stable isotope probing were used to trace the incorporation of 13C into the cladoceran Bosmina and its potential food items. Glucose-C was shown to be assimilated into phytoplankton (including fungi and heterotrophic protists), bacteria and Bosmina, all of which became enriched with 13C during the experiment. The study suggests that bacteria play an important role in the transfer of glucose-C to Bosmina. Furthermore, osmotic algae, fungi and heterotrophic protists might also contribute to the isotopic signature changes observed in Bosmina. These findings help to clarify the contribution of dissolved organic carbon to zooplankton and its potential pathways.

Submerged macrophytes cannot be utilized directly by zooplankton. However, vegetation can serve as an organic carbon resource for heterotrophic bacteria, which are themselves accessible to zooplankton. We therefore hypothesize that submerged macrophytes supply a carbon source to zooplankton by increasing the availability of food such as heterotrophic bacteria. Here, we used stable carbon isotope (13C) labeling to trace the carbon flow from submerged macrophytes to zooplankton with a mesocosm experiment. The carbon stable isotope ratios of zooplankton and their potential food sources were analyzed in mesocosms planted with 13C-labeled Hydrilla verticillata (L. f.) Royle in comparison with the control in which plastic plants were planted. We found that all potential food resources of zooplankton, including phytoplankton, bacterioplankton, macrophyte-associated epiphyton and epibacteria, were significantly enriched with 13C in the presence of 13C-enriched H. verticillata. Zooplankton were significantly more enriched with 13C than phytoplankton, epiphyton and bacterioplankton but significantly less enriched with 13C than epibacteria. Based on a stable isotopic mixing model, we found a macrophyte carbon contribution of 30.5% to epibacteria and 14.7% to zooplankton. Our results indicated that macrophytes might be used by zooplankton as a carbon resource, mainly via a pathway involving epibacteria attached to macrophytes. [ABSTRACT FROM AUTHOR]