摘要
片段化生境中群落的物种分布常呈现出嵌套格局。本研究选取蚜虫作为研究对象,分别于2020年和2021年每年的5-8月对千岛湖18个陆桥岛屿进行了蚜虫群落调查,同时调查了各岛屿上蚜虫生境中总体植物的群落组成,以及与蚜虫存在种间互作关系的寄主植物群落和互惠蚂蚁群落组成。探究了蚜虫群落的嵌套分布格局及其影响因素,并利用结构方程模型探究了种间互作在其中发挥的作用。结果表明:(1)千岛湖片段化生境中的蚜虫群落呈现显著的嵌套格局;(2)随机分布模型结果显示该嵌套格局并非被动取样造成;(3)千岛湖片段化生境中蚜虫群落的岛屿嵌套序列与岛屿面积显著相关,且各岛屿上蚜虫生境中的总体植物群落呈现显著嵌套格局,该结果支持选择性灭绝假说和生境嵌套假说;(4)寄主植物物种丰富度对蚜虫嵌套格局存在显著正向影响,植物与蚜虫间的互作关系促进了蚜虫群落嵌套格局的形成。因此,在研究物种嵌套格局形成机制时,应充分考虑种间互作等因素的影响。
Aims:Nested subset pattern(nestedness)of species distributions is widespread in fragmented habitats.This study aims to explore the nested distribution pattern of aphid communities and the potential influencing mechanisms,including the effects of plant-aphid interaction and ant-aphid interaction on aphid community nesting structure,in the fragmented landscape of the Thousand Island Lake,China.Methods:We surveyed aphid communities on 18 land-bridge islands from May to August in both 2020 and 2021.Meanwhile,we surveyed host plant communities and mutualistic ant communities that have close interspecific interactions with aphid communities,along with integral plant communities in the aphid habitats.We analyzed the nestedness of the aphid communities and the integral plant communities by using NODF(nestedness metrics based on overlap and decreasing fill).We also used the random placement model to evaluate whether the passive sampling hypothesis played a major role in generating the nestedness of aphid communities.Moreover,we evaluated the role of island variables(island area and degree of isolation)in generating nestedness based on multiple linear regression.We also used the piecewise structural equation model to analyze the influence of island variables(island plant richness,host plant richness,and mutualistic ant richness)on the nestedness of aphid communities.Results:(1)Aphid assemblages were significantly nested in the Thousand Island Lake;(2)The nestedness of aphids was not caused by passive sampling;(3)The nestedness of aphid communities had a significantly positive correlation with island area in the Thousand Island Lake,which supports the hypothesis of selective extinction.The nestedness of integral plant communities also supports the hypothesis of habitat nestedness;(4)The piecewise structural equation models showed that the diversity of host plants had a significant and positive influence on the nested ranking of aphid assemblages.Conclusion:Our study showed that the nestedness of aphid communities in the Thousand Island Lake was driven by selective extinction and habitat nestedness,and the plant-aphid interaction,as an important intermediate factor,had a significantly direct effect on the nestedness.Therefore,the roles of interspecific interactions involving focus species should be fully considered when analyzing the underlying mechanism generating nested subset pattern.
作者
蔡畅
张雪
朱晨
赵郁豪
乔格侠
丁平
Chang Cai;Xue Zhang;Chen Zhu;Yuhao Zhao;Gexia Qiao;Ping Ding(College of Life Sciences,Zhejiang University,Hangzhou 310058;Institute of Eco-Chongming,East China Normal University,Shanghai 202162;Zhejiang Zhoushan Island Ecosystem Observation and Research Station,Zhejiang Tiantong Forest Ecosystem National Observation and Research Station,School of Ecological and Environmental Sciences,East China Normal University,Shanghai 200241;Key Laboratory of Zoological Systematics and Evolution,Institute of Zoology,Chinese Academy of Sciences,Beijing 100101;College of Life Sciences,University of Chinese Academy of Sciences,Beijing 100049)
出处
《生物多样性》
CAS
CSCD
北大核心
2023年第12期108-119,共12页
Biodiversity Science
基金
国家自然科学基金(31930073,32030066)
关键词
岛屿面积
寄主植物
结构方程模型
千岛湖
嵌套格局
生境片段化
蚜虫
种间互作
island area
host plant
structural equation model
Thousand Island Lake
nested subset pattern
habitat fragmentation
aphid
interspecific interaction