| 摘要: |
| 互花米草(Spartina alterniflora)作为我国滨海湿地重要的外来入侵植物，能够通过改变有机质来源和能量传递过程影响潮间带生态系统食物网结构，为探究象山港潮间带底栖生态系统的营养结构及能量传递路径，评估入侵物种互花米草对潮间带生态系统的影响，本研究于2023年7月在象山港互花米草定殖潮间带采集5种潜在碳源样本和28种生物样本，利用稳定同位素技术分析各组分同位素特征，并结合MixSIAR模型估算不同碳源对大型底栖动物的贡献率，以构建底栖食物网结构。结果显示，大型底栖动物不同类群间δ^13 Cδ13C和δ^15 Nδ15N值存在显著性差异(pP<0.05)。底栖动物营养级范围为1.79至3.48，其中鱼类处于最高营养级，双壳类最低；互花米草与SOM、POM构成的碎屑碳源贡献率(59.5%)高于浮游碳源(40.5%)，互花米草在除鱼类外的其他类群中均为重要碳源，是推动碎屑通道成为优势的关键因素。象山港底栖食物网由碎屑路径与浮游路径共同支撑，且对碎屑通道的依赖性更强。研究为认识互花米草定殖对象山港潮间带底栖食物网结构与能量流动提供科学参考。 |
| 关键词: 象山港 大型底栖动物 稳定同位素 食物网 |
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| 基金项目:国家自然科学基金(42076156) |
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| Structure and Characteristics of the Benthic Food Web in the Spartina alterniflora-Colonized Intertidal Zone of Xiangshan Bay |
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Shuyuan Huang1, Zhou Meng2, Aoxiang Huang1, Qingxi Han1
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1.School of Marine Sciences,Ningbo University;2.Zhejiang Institute of Freshwater Fisheries
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| Abstract: |
| Spartina alterniflora, an important invasive alien plant in China''s coastal wetlands, can alter the structure of intertidal food webs by changing the sources of organic matter and energy transfer pathways.To investigate the trophic structure and energy transfer pathways of the benthic ecosystem in the intertidal zone of Xiangshan Bay, and to evaluate the effects of the invasive species Spartina alterniflora on the intertidal ecosystem, five potential carbon sources and 28 biological samples were collected from the Spartina alterniflora-colonized intertidal zone of Xiangshan Bay in July 2023. Stable isotope techniques were applied to analyze the isotopic characteristics of each component, and the MixSIAR model was used to estimate the contributions of different carbon sources to macrobenthic organisms, thereby constructing the benthic food web structure. The results showed that δ¹³C and δ¹?N values differed significantly among different macrobenthic groups (Pp < 0.05). The trophic levels of benthic organisms ranged from 1.79 to 3.48, with fish occupying the highest trophic level and bivalves the lowest. Detrital carbon sources composed of Spartina alterniflora, sediment organic matter (SOM), and particulate organic matter (POM) contributed 59.5%, exceeding the contribution of planktonic sources (40.5%). Spartina alterniflora was an important carbon source for all groups except fish and played a key role in promoting the dominance of the detrital pathway. The benthic food web in Xiangshan Bay is jointly supported by detrital and planktonic pathways, with a stronger reliance on the detrital pathway. This study provides a scientific reference for understanding the effects of Spartina alterniflora colonization on the structure and energy flow of the benthic food web in the intertidal zone of Xiangshan Bay. |
| Key words: Xiangshan Bay macrobenthos stable isotopes food web |