欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

草海湿地食物链稳定碳氮同位素特征与食物链结构

宋正城1,曾玲霞1,何天容1*,李振吉2   

  1. 1贵州大学国土资源部喀斯特环境与地质灾害防治实验室, 贵阳 550003;2贵州草海国家级自然保护区管理局, 贵州威宁 553100)
  • 出版日期:2019-03-10 发布日期:2019-03-10

Stable carbon and nitrogen isotope characteristics and structure of the food chain in Lake Caohai.

SONG Zheng-cheng1, ZENG Ling-xia1, HE Tian-rong1*, LI Zhen-ji2   

  1. (1Key Laboratory of Karst Environment and Geohazard, Ministry of Land and Resources, Guizhou University, Guiyang 550003, China; 2Guizhou Caohai National Nature Reserve Administration, Weining 553100, Guizhou, China).
  • Online:2019-03-10 Published:2019-03-10

摘要: 以国家级自然保护区贵州威宁草海为研究对象,利用稳定同位素技术,分析草海湿地食物链碳(δ13C)、氮(δ15N)同位素特征,计算各生物类群营养级别,建立草海食物链结构。结果表明:草海湿地生态系统中δ13C比值范围为-27.56‰~-13.25‰(均值±标准差,-21.52‰±3.61‰);δ15N值范围为0.32‰~15.14‰(8.69‰±3.92‰),δ13C与δ15N呈显著负相关(r=-0.423,P<0.01)。草海湿地食物链中消费者营养级处于0.8~3.7,其中:鱼类营养级为0.8~2.5,相对其他地区偏低;底栖动物营养级为2.0~2.8,鸟类营养级为1.0~3.7。鱼类和底栖动物的营养级别均表现为肉食性>杂食性>植食性。草海食物链结构复杂,主要的两条碳流动途径分别为:底泥和浮游植物→浮游动物→鱼类→鸟类以及水生植物→鱼类和鸟类。

关键词: 美洲斑潜蝇, 次生化合物, 机油乳剂, 寄生蜂, 种群动态控制

Abstract: To clarify the trophic level of each biological group and examine the food chain in Caohai, a National Nature Reserve, the characteristics stable carbon (δ13C) and nitrogen (δ15N) isotope of aquatic organisms in Caohai were analyzed. The δ13C values in Caohai ecosystem ranged from -27.56‰ to -13.25‰ (Mean±SD: -21.52‰±3.61‰) and the δ15N varied from 0.32‰ to 15.14‰ (Mean±SD: 8.69‰±3.92‰). There was a significant negative correlation between δ13C and δ15N values (r=-0.423, P<0.01). The trophic levels in different biological groups ranged from 0.8 to3.7: fishes, 0.8-2.5; benthonic animals, 2.0-2.8; birds, 1.0-3.7. Moreover, the trophic levels in fishes and benthonic animals were different in different feeding habits, with an order of carnivorous>omnivorous>phytophagous. The food chain in Caohai had two transmitting carbon pathways: sediment/phytoplankton→zooplankton→ fish → birds, and hydrophyte→ fish → birds.

Key words: Liriomyza sativae, Secondary substance, Petroleum spray oil, Parasitoids, Population control