摘要
红树林是滨海生产力最高的生态系统,林内有机碳来源多元化,使得底栖食物网营养结构较为复杂。本研究以沿浦湾红树林底栖动物(鱼类、贝类、甲壳类)为研究对象,采用稳定同位素技术结合贝叶斯标准椭圆模型(SIBER模型)和稳定同位素溯源混合模型(Simmr模型)分析底栖动物群落营养结构,并确定潜在食物来源。研究表明:底栖动物碳稳定同位素(δ^(13)C)值范围为-22.04‰~-11.27‰,氮稳定同位素(δ^(15)N)值范围为5.86‰~16.21‰,营养级介于1.00(红树拟蟹守螺)~3.62(大鳍弹涂鱼)之间。其中,鱼类的营养级偏高,为2.05~3.62,甲壳类为2.28~3.19,而贝类相对偏低,介于1.00~2.83之间,这与不同类群的食性偏好差异有关。由营养生态位分析可知,鱼类的食物链长度和营养多样性高于甲壳类和贝类,甲壳类的食物来源多样性和营养均匀度均最高,而贝类的营养多样性和营养相似性最高。总体上,鱼类、甲壳类和贝类之间的核心营养生态位出现不同程度上重叠。基于贝叶斯混合模型分析底栖动物潜在食物来源发现,沉积有机物(Soil organic matter,SOM)为主要碳源,占78.2%,其次是浮游植物,占21.6%,而凋落物和悬浮有机质(Particulate organic matter,POM)最低,分别为3.7%和3.3%。研究结果完善了我国北缘红树林底栖动物营养关系,有助于更好地从营养调控角度开展红树林生物多样性保护与修复工作。
Mangroves represent the most productive ecosystem along the coastline.The mangrove forest is a source of diverse organic carbon,which contributes to the complexity of the trophic structure of the benthic food web.This study employed the benthic animals in the mangroves along Yanpu Bay as the research object,analysing the community trophic structure and determining the potential food sources through the utilisation of the stable isotope technique in conjunction with the Stable Isotope Bayesian Ellipses(SIBER)model and the Stable Isotope Mixing Models(Simmr).The study demonstrated that the carbon stable isotope(δ13C)values of benthic animals ranged from-22.04‰to-11.27‰,while the nitrogen stable isotope(δ15N)values ranged the trophic levels ranged from 1.33(Cerithidea rhizophorarum)to 3.95(Periophthalmus cantonensis),with carbon stable isotope(δ13C)values from 5.86‰to 16.21‰.The trophic level of fish is relatively high,ranging from 2.38 to 3.95,while that of crustaceans is 2.61 to 3.52.In contrast,the trophic level of mollusc is relatively low,ranging from 1.33 to 3.15.These differences are related to the feeding preferences of the different groups.The analysis of the nutritional structure indicates that the length of the food chain and the nutritional diversity of fish are greater than those of crustaceans and mollusc.The diversity of food sources and nutritional uniformity of crustaceans are the highest,while the nutritional diversity and similarity of mollusc are the highest.Overall,there is a varying degree of overlap between the core nutritional niches of fish,crustaceans and mollusc.An analysis of the potential food sources of benthic animals based on a Simmr mixed model revealed that SOM was the primary carbon source,accounting for 78.2%of the total,followed by phytoplankton,which constituted 21.6%of the total,while litter and POM represented the lowest proportions,at 3.7%and 3.3%,respectively.The findings of this study enhance our comprehension of the trophic relationships of benthic animals in mangrove ecosystems along the northern coast of China.They will facilitate more effective conservation and restoration of mangrove biodiversity from a trophic regulation perspective.
作者
曲昱玮
过美蓉
水柏年
朱大千
张娜
马亚东
冯佳宇
胡成业
Qu Yuwei;Guo Meirong;Shui Bonian;Zhu Daqian;Zhang Na;Ma Yadong;Feng Jiayu;Hu Chengye(School Of Fishery,Zhejiang Ocean University,Zhoushan 316022,China;Zhejiang Marine Ecology and Environment Monitoring Center,Zhoushan 316021,China)
出处
《海洋学报》
北大核心
2025年第3期51-61,共11页
基金
国家自然科学基金(42306188,42206203)
浙江省自然科学基金(LQ21C030006)
浙江省教育厅科研项目(Y202354018,Y202457341)。
