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Background Adolescent depressive symptoms are a significant mental health concern. Physical activity and core self-evaluation are potential protective factors against mental health issues. However, their combined associations with depression and subgroup heterogeneity in Chinese adolescents remain insufficiently understood. Objective This study examines the relationship between physical activity and core self-evaluation in relation to depressive symptoms, employing both variable-centered and person-centered approaches, and identifies subgroups defined by joint patterns of these variables. Method s Participants included 948 junior high school students (mean age: 12.54 +/- 1.11 years; 56.2% female) who completed the Physical Activity Rating Scale, the Core Self-Evaluation Scale, and the depression subscale of the Depression, Anxiety, and Stress Scale-21. Controlling for sex, grade, and residence, mediation was tested in SPSS using PROCESS Model 4 with 5,000 bootstrap resamples. Item-level indicators were entered into Mplus 8.3 for latent profile analysis (LPA) of physical activity and core self-evaluation. Results Physical activity was inversely associated with depressive symptoms (beta = -0.22, p<0.001) and positively associated with core self-evaluation (beta = 0.46, p<0.001). Core self-evaluation was negatively associated with depressive symptoms (beta = -0.35, p<0.001) and partially accounted for the association between physical activity and depressive symptoms (indirect beta = -0.16, 95% confidence interval = [-0.21, -0.12]), representing about 42% of the total effect. LPA identified three subgroups: low physical activity-low core self-evaluation (18.36%), moderate-moderate (60.55%), and high-high (21.09%), with the low-low group reporting the highest depressive symptoms and the high-high group the lowest. Conclusion Physical activity and core self-evaluation show complementary associations with lower depressive symptoms in Chinese adolescents, supporting integrated, stratified programs that foster active lifestyles and positive self-views.
A revised inventory of the 12 species of the subfamily Ceratocanthinae (Coleoptera: Hybosoridae) recorded thus far from China is presented, with four genera: Cyphopisthes Gestro, 1898 (2 spp.), Eusphaeropeltis Gestro, 1898 (2 spp.), Madrasostes Paulian, 1975 (5 spp.), and Pterorthochaetes Gestro, 1898 (3 spp.). Madrasostes feae (Gestro, 1898) and Pterorthochaetes dembickyi Ballerio, 2014 are newly included for China; an additional locality is reported for P. dembickyi; Eusphaeropeltis medogensissp. nov. is described from Mêdog County. Photographic documentation of habitus and genitalia is provided for the focal taxa.
A new species of longhorn beetle, Anoplophora dafengdingensis Wang, Wang, and Wang, new species, from Sichuan Province, China is described and illustrated. A differential diagnosis of the new species from its congeners is provided.
Soil microbivorous nematodes (bacterivores and fungivores) regulate the formation of microbial necromass carbon (MNC) through predation-driven shifts in microbial biomass and community composition, with straw return amplifying these effects via an increase in the abundance of microbivorous nematodes. However, how microbivorous nematodes affect MNC formation under straw return remains unclear. A 14-year field experiment was conducted in Southwest China to investigate the soil microbivorous nematode abundance, microbial biomass, and MNC content, along with their relationships across four levels of straw return: control (0 % return, CK), low (30 % return, S30), moderate (50 %, S50), and full (100 %, S100). Compared to the CK treatment, all straw return treatments significantly increased the contents of bacterial necromass carbon (BNC) by 29.1-55.3 %, fungal necromass carbon (FNC) by 35.5-49.8 %, and MNC by 33.4-51.6 %, but compared to the CK treatment, only the S100 treatment significantly increased the proportions of BNC, FNC, and MNC contributing to soil organic carbon (SOC). Compared to the CK treatment, the S100 treatment also significantly increased the abundance of r-strategist bacterivores by 163.4 %, bacterial biomass by 21.7 %, and the ratio of gram-positive (G+) bacteria to gram-negative (G-) bacteria by 9.3 %. Further correlation and aggregated boosted trees (ABT) analyses indicated that r-strategy bacterivores promoted BNC formation by influencing bacterial biomass and the ratio of G+ to G-. Moreover, the carbon use efficiency (CUE) of bacterivores was significantly positively correlated with the BNC and the ratios of BNC and MNC to SOC. Compared to the S30 and S50 treatments, the S100 treatment significantly increased the content of BNC, which was attributed to the elevated CUE of bacterivores in the S100 soil. Additionally, although straw return also significantly increased the abundance of fungivores, ABT analysis indicated that the effect of bacterivores on FNC was stronger than that of fungivores. Overall, 14 years of continuous straw return in a maize-wheat rotation system can increase the MNC content and its ratio to SOC by influencing the abundance of microbivorous nematodes and CUE, with the most pronounced effects observed under the S100 treatment.
Pelecotoides Laporte, 1833 (Coleoptera: Ripiphoridae: Ptilophorinae) is reported from western China for the first time; a new species, P. xui sp. nov., is described and illustrated from Xizang. A key to the three Asian species of Pelecotoides is provided.
