Detection of Effects of a High Trophic Level Predator, Sorex unguiculatus (Soricidae, Mammalia), on a Soil Microbial Community in a Cool Temperate Forest in Hokkaido, Using the ARISA Method

Yamamoto, Kana; Ohdachi, Satoshi D.; Kasahara, Yasuhiro

doi:10.1264/jsme2.me10111

Cited by 3 publications

(1 citation statement)

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“…In addition, the shrew had no clear detectable effect on the bacterial community in the same experimental plots of the present study (Yamamoto et al 2010), implying that the shrew's effect does not reach down to the microbial decomposing process of the litter.…”

Section: Effect Of the Shrew On Litter Decompositionmentioning

confidence: 44%

Top-Down Cascade Effects of the Long-Clawed Shrew (Sorex unguiculatus) on the Soil Invertebrate Community in a Cool-Temperate Forest

Namba

Ohdachi

2016

Mammal Study

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In a soil ecosystem, bottom-up control is generally considered more influential than topdown control, although some empirical studies have suggested that predators have a trophic cascade effect on soil animals at lower trophic levels. In the present study, the effects of the long-clawed shrew, a mammalian predator at a high trophic level, on the soil invertebrate community and litter decomposition were investigated in a field experiment using enclosures. In the presence of the shrew, the population densities of earthworms, isopods and spiders tended to decrease, whereas that of large springtails and centipedes appeared to increase. This result might have been caused by the shrew’s direct predation on the former invertebrates and the release from predation by spiders on springtails. The reason of the increase of centipedes was unknown. Shrew had no effects on litter decomposition rates both by litter trap analysis and litter-bag test. The top-down effects of shrews on litter decomposition might have been diluted through a complex food-web and the observing period of the present study might be too short to detect litter decomposition process. Experiment for longer time might demonstrate more explicit effect of the shrew on the soil ecosystem

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Section: Effect Of the Shrew On Litter Decompositionmentioning

confidence: 44%