Functional redundancy dampens the trophic cascade effect of a web-building spider in a tropical forest floor. (July 2016)

• Record Type: Journal Article
• Authors: Liu, Shengjie; Behm, Jocelyn E.; Chen, Jin; Fu, Shenglei; He, Xinxing; Hu, Jing; Schaefer, Douglas; Gan, Jianmin; Yang, Xiaodong
• Is Part Of: Soil biology and biochemistry. Volume 98(2016)
• Page Start: 22
• Page End: 29
• Publication Date: 2016-07
• Subjects: Functional redundancy -- Trophic cascade effect -- Detritus-based food webs -- Spiders -- Tropical forest-floor -- Litter decomposition; Soil biochemistry -- Periodicals; Soil biology -- Periodicals; Sols -- Biochimie -- Périodiques; Sols -- Biologie -- Périodiques; Sols -- Microbiologie -- Périodiques; Bodembiologie; Biochemie; 631.46
• DOI: 10.1016/j.soilbio.2016.03.020
• Languages: English
• ISSNs: 0038-0717

Abstract

Abstract: The trophic cascade effect of predators on ecosystem functioning is generally believed to be less frequent and weaker in detritus-based than primary producer-based food webs, in part because of functional redundancy among soil fauna. Despite this view, no empirical studies have explicitly examined roles of different soil fauna within trophic levels in mediating cascading effects of predators in detritus food webs. Here we manipulated the density of a dominant funnel-web building spider Macrothele yunnanica in permanent plots (1 m 2 ) for one year. Three spider treatments were applied: 0 spiders, 6 spiders (natural density) and 10 spiders (high density). We found that although changes in spider densities caused large shifts in litter-dwelling Collembola community composition on average, modifying spider densities did not generate a trophic cascade effect and alter litter decomposition in litter bags with coarse mesh (2 mm). Our data supports the hypothesis that functional redundancy among Collembola species may weaken the strength of spider-initiated cascading effects. Consequently, changes in Collembola diversity occupying the same trophic level may not significantly alter ecosystem function in tropical forest-floor ecosystems. Highlights: Changes in spider densities caused large shifts in collembolan composition. Changes in spider densities did not alter litter decomposition. Functional redundancy among Collembola may weaken strength of cascading effects.