期刊
ECOLOGICAL RESEARCH
卷 21, 期 4, 页码 611-615出版社
WILEY
DOI: 10.1007/s11284-006-0155-0
关键词
trophic cascade; food web; multitrophic interaction; predation; Collembola
类别
A top-down cascade in detritus-based food webs has the potential to alter ecosystem functioning but its prevalence in terrestrial systems remains unclear. We manipulated the density of the dominant web spider Neriene brongersmai for 1.5 years to see whether the cascading effect would propagate down to the litter decomposition rate in the forest-floor of a Japanese cedar forest. Decreasing spider abundance increased collembolan density, but it did not change the biomass of microorganisms or the litter decomposition rate. We propose possible explanations for the absence of a top-down cascade and discuss the difficulty in generalizing the presence and absence of a cascading effect in soil ecosystems.
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