Exotic Spartina alterniflora invasion changes temporal dynamics and composition of spider community in a salt marsh of Yangtze Estuary, China
Exotic Spartina alterniflora invasion changes temporal dynamics and composition of spider community in a salt marsh of Yangtze Estuary, China
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外来互花米草入侵改变了中国长江口盐沼蜘蛛群落的时间动态和组成
DOI：
10.1016/j.ecss.2020.106755
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发表时间：
2020-07-05
影响因子：
2.8
通讯作者：
Wu, Jie
中科院分区：
文献类型：
--
作者：
Ge, Yingqiang;Pan, Hui;Wu, Jie
蜘蛛在陆地生态系统中对节肢动物种群的调节起着重要作用。然而，外来植物入侵对蜘蛛群落的影响仍然知之甚少，特别是在盐沼系统，这是特别容易受到这种入侵。外来物种互花米草（Spartina alterniflora）入侵我国滨海湿地后，对长江口九段沙湿地蜘蛛多样性和群落组成的影响进行了研究。为此，我们在一年的时间里，分别在S.在九段沙，以互花米草为主的沼泽（SDM）和原生芦苇为主的沼泽（PDM）。结果表明，S.互花米草的入侵总体上对SMS和SPFS的生物多样性都有积极的影响，但实际上改变了SMS物种丰富度和丰度的季节波动。主成分分析结果表明，SDM和PDM的SMS和SPFS群落组成不同。特别是，短信社区组成表现出更明显的时间模式在PDM比在SDM。SDM和PDM之间的Bray-Curtis相异性指数在SMS中的采样月份之间的变化比在SPFS中的变化大。典范对应分析结果表明，潮高对SDM中SMS和SPFS的群落组成有显著影响。相反，对于蜘蛛在PDM，潮汐高程有减弱的影响SMS的群落组成。这可能是由于这两种植物在高潮和低潮时的分布不同所致。综上所述，我们的研究表明，S。互花米草入侵改变了九段沙湿地蜘蛛群落的时间动态和组成。在未来的研究中，应该强调的是，蜘蛛的栖息地特征和生态位的变化是重要的介导外来植物对本地蜘蛛群落的入侵效应。
Spiders play important roles in regulating arthropod populations in terrestrial ecosystems. However, the impact of exotic plant invasion on the spider community is still poorly understood, especially in salt marsh systems, which are especially susceptible to this invasion. The exotic Spartina alterniflora has widely invaded the coastal wetlands of China, and this study aims to evaluate such effects on the spider diversity and community composition in the Jiuduansha wetland of Yangtze Estuary. To do this, for a one-year period, we have collected spiders from the marsh surface (SMS) as well as spiders from the plant foliage surface (SPFS) respectively in S. alterniflora-dominated marshes (SDM) and native Phragmites austra/is-dominated marshes (PDM) in Jiuduansha. Results showed S. alterniflora invasion generally had a positive effect on the biodiversities of both SMS and SPFS, but actually changed the seasonal fluctuation of species richness and abundance of SMS. According to principal component analysis, community compositions of SMS and SPFS were different between SDM and PDM. Specially, SMS community composition exhibited more obvious temporal patterns in PDM than in SDM. The Bray-Curtis dissimilarity index between SDM and PDM varied more between sampling months in SMS than in SPFS. Based on canonical correspondence analysis, tidal elevation significantly affected community compositions of SMS and SPFS in SDM. In contrast, for spiders in PDM, tidal elevation had a weakened effect on SMS community composition. This may be explained by the different distribution of the two plants at high and low tidal levels. In summary, our study suggests that S. alterniflora invasion has changed the temporal dynamic and composition of the spider community in the Jiuduansha wetland. In future research, it should be highlighted that variations in habitat characteristics and ecological niches of spiders are important in mediating the invasive effects of exotic plants on the native spider community.