海南新村湾海草床主要鱼类及大型无脊椎动物的食源  

Food sources of fish and macro-invertebrates in a tropical seagrass bed at Xincun Bay,Southern China

作　　者：樊敏玲[1,2] 黄小平[1] 张大文[1] 张景平[1,2] 江志坚[1,2] 曾艳艺[1,2] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广州510301 [2]中国科学院研究生院,北京100049

出　　处：《生态学报》2011年第1期31-38,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(40776086);中国科学院南海海洋研究所领域前沿项目(LYQY200706);联合国环境规划署/全球环境基金(UNEP/GEF)项目(UNEP/GEF/SCS/Chi/MoU2c)

摘　　要：利用稳定碳同位素技术,分析了海南岛新村湾海草床中主要鱼类及大型无脊椎动物的食物来源。结果显示,有机碳源δ13C值的变化范围为-16.9‰—-6.8‰,以海草叶片及其碎屑最高(-7.8‰±0.2‰),悬浮颗粒有机质(POM)最低(-16.9±0.2)‰,而附生藻类(-12.0±0.9)‰和沉积物有机质(SOM)(-13.2±0.2)‰居中。消费者δ13C值的变化范围为-15.4‰—-6.4‰,表明其食物来源较广。IsoSource混合模型计算结果表明,本海草床棘皮动物、多毛类、甲壳类和大部分的鱼类以海草为主要有机碳源,双壳类主要同化附生藻类和SOM的混合有机碳源,少数鱼类以POM为主要碳源。以上结果表明,海草是海草床中主要鱼类及大型无脊椎动物的重要食物来源。Seagrass beds are highly diverse and productive ecosystems,and are well-known as one of the most economically valuable ecosystems on earth.They provide food and habitat for numerous fish and invertebrate species.Based on present knowledge,the stability of the species communities living in seagrass beds is largely depending on the availability of food,therefore studying the food sources and trophic structures of the living components within seagrass beds is very important for understanding the dynamic process and the sustainability of seagrass ecosystems.So far most publications are focusing on seagrass food webs in temperate regions,such as Mediterranean Sea and the western Australia,and little information is available of those seagrass beds located in tropical-subtropical areas including southern China. This paper,using the stable carbon isotope analysis method,attempts to identify the main food sources for fish and macro-invertebrates living in a mixed-species tropical seagrass bed at Xincun Bay,southern China,and mainly focuses on their δ13C values.The δ13C values of the studied organic sources range from-16.9‰ to-6.8‰,with seagrass leaves and leaf litter being the most 13C-enriched sources（-7.8±0.2）‰,POM（particulate organic mater） being the most 13C-depleted source（-16.9±0.2）‰,and seagrass epiphytes（-12.0±0.9）‰） and SOM（sediment organic matter）（-13.2±0.2）‰ having δ13C values in the middle.Three studied seagrass species,Thalassia hemprichii,Enhalus acoroides and Halodule uninervis,have δ13C values of（-8.9±0.1）‰,（-6.8±0.4）‰ and（-8.4±0.1）‰,respectively.The studied 12 invertebrate species have δ13C values ranging from-12.5‰ to-6.4‰,and the studied 13 fish species have δ13C values between-15.4‰ and-8.5‰.The above experimental results suggest that the δ13C values of different components from the seagrass bed are significantly different and therefore they can be used as tracers to identify the food sources for different creatures living in

关 键 词：海草 δ13C 食物来源 鱼类 大型无脊椎动物 

分 类 号：Q178.53[生物学—水生生物学]