• 研究论文 •

### 应用稳定同位素测定贵州凤冈麻湾洞洞穴陆生动物的食物来源及营养级

1. 1贵州师范大学生命科学学院， 贵阳 550025； 2贵州师范大学喀斯特洞穴研究中心， 贵阳 550025）
• 发布日期:2020-06-10

### Using stable isotopes to assess food source and trophic level of terrestrial animals in Mawan cave of Fenggang in Guizhou.

XU Cheng-xiang1,2*, DU Wei-feng1, ZHANG Si-qiang1, ZHANG Yan1, YANG Rui-quan1, LIU Xi-zhu1

1. (1School of Life Sciences, Guizhou Normal University, Guiyang 550025, China; 2Institute of Karst Caves, Guizhou Normal University, Guiyang 550025, China).
• Published:2020-06-10

Abstract: We measured the isotope ratios of δ13C and δ15N in cave animals and their organic carbon sources in Mawan cave of Fenggang, Guizhou, and further analyzed trophic level relationship and food sources of the cave ecosystem. The results showed that the values of plant δ13C in the cave ranged from -41.78‰ to -38.80‰, which is lower than that of plants out the cave. The δ15N of plants in the cave ranged from -1.31‰ to 1.23‰, which is within the range of terrestrial organic matter. The δ13C of soil organic matter in the cave ranged from -31.09‰ to -24.95‰, while the δ15N of soil organic matter in the cave ranged from -1.08‰ to 7.72‰. The δ13C of cave animals ranged from -30.41‰ to -12.02‰, while their δ15N ranged from 2.07‰ to 8.94‰. The contribution rate of cave soil organic matter to animals was more than 72%, being higher than that of plants, indicating that soil organic matter was the main food source for cave animals. There were four trophic levels in the food web. Plants were the first trophic level. Tipula sp., Gastropoda, and Diolopoda were the second trophic level. Distrammena sp., Mecistocephalus sp. were the third trophic level. Most of Araneae groups were the third or fourth trophic level. Our results indicate that the trophic levels of most animals were relatively stable in the cave. A few animals from same species have different trophic levels in different light zones, whereas different species belonging to the same group would be at different trophic levels in the same light zone.