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A controlled experiment was conducted to investigate temperature-induced alterations in serum biochemical indices and gut microbiota of endemic fish (Procypris rabaudi) in Jinsha River, a cascade hydropower development river in southwest China. Three temperature treatments (16℃, 20℃, 24℃) were established with exposure durations of 24h and 10d. Results showed that compared to the ambient temperature group, the serum antioxidant enzyme activity was promoted in the low temperature group after 24h but inhibited after 10d. The decrease in lysozyme (LZM) activity in the low temperature group of 10d (67.12%) was more significant than that of 24h group (52.04%) relative to the ambient temperature group. And the concentrations of glucose (GLU) and CORTISOL were increased significantly in the low temperature groups both 24h and 10d compared with those in the ambient temperature groups. The Chao1index of the low temperature group at 24h were 23.22% and 26.36% lower than those of the ambient temperature and high temperature groups, respectively. The alpha diversity was found to stabilize in the low temperature group after 10d. Compared to 24h, the difference in gut microbiota community structure under different temperature conditions after 10d was smaller, and the low temperatures significantly affected the community composition of the gut microbiota. Co-occurrence network analysis revealed that microbial interactions were simplified and weakened in the low temperature group (24h), whereas prolonged thermal adaptation (10d) was associated with network stabilization. Significant correlations were established between Proteobacteria, Bacteroidetes, and Firmicutes with antioxidant enzymes and LZM activity.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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