Luo Jin Ming, Wang Yong Jie, Wang Wen Feng, Gao Zhong Yan
Department of Science, Qiqihar University, Qiqihar 161006, Heilongjiang, China.
Zhalong National Natural Reserve Administration, Qiqihar 161002, Heilongjiang, China.
Ying Yong Sheng Tai Xue Bao. 2017 Jul 18;28(7):2315-2320. doi: 10.13287/j.1001-9332.201707.038.
The trophic relations of the red-crowned crane species in Zhalong Wetland, northeastern China may change significantly withrapid decrease of biological resources. In this paper, the influence of food resource exhausting on the trophic levels of this vulnerable species was determined by using stable isotope (δC and δN) methods. The results indicated that the mass of δC and N in the red-crowned cranes were in the range of -17.8‰ to -18.5‰ and 6.9‰ to 8.1‰, respectively. The dominant food chain length of large water fowls in the ecosystem of Zhalong Wetland was 3.8±0.2 in average, of which the examined species, i.e., red-crowned cranes were 3.1 in average, with the range of 2.9 to 3.3. The annual fluctuation range of δN values in the red-crowned cranes was from 7.4‰ to 8.8‰ (with the gap of approximately 1.4, which was below the threshold 3.4 that was considered as a trophic level significant change in an ecosystem), indicating the trophic level of this vulnerable species did not change significantly with the losses of large area of their habitats and foods. Nevertheless, the rapid decrease of the target species population with the food resource exhausting indicated that the conflict of food demand of the red-crowned cranes versus resource need of local residents should be resolved for better protecting this extinguishable species.
中国东北扎龙湿地丹顶鹤种群的营养关系可能会随着生物资源的迅速减少而发生显著变化。本文采用稳定同位素（δC和δN）方法，确定了食物资源枯竭对这一濒危物种营养级别的影响。结果表明，丹顶鹤体内δC和δN的质量分别在-17.8‰至-18.5‰和6.9‰至8.1‰范围内。扎龙湿地生态系统中大型水禽的优势食物链平均长度为3.8±0.2，其中所研究的物种即丹顶鹤平均为3.1，范围在2.9至3.3之间。丹顶鹤体内δN值的年波动范围为7.4‰至8.8‰（差值约为1.4，低于被认为是生态系统中营养级显著变化的阈值3.4），这表明这一濒危物种的营养级别并未随着其大面积栖息地和食物的丧失而发生显著变化。然而，随着食物资源枯竭目标物种数量迅速减少，这表明为了更好地保护这一濒危物种，需要解决丹顶鹤的食物需求与当地居民资源需求之间的冲突。
