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Contributions of detrital subsidies to aboveground spiders during secondary succession, revealed by radiocarbon and stable isotope signatures

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Abstract

Prey subsidies originating from detritus add nutrients and energy to arboreal communities. Measurement of this subsidy is required in the understanding of how food web dynamics respond to changes in surrounding environments. Shrub spiders are one of the key predators involved in food web coupling. We evaluate the effects of potential changes in prey availabilities during secondary succession on the contribution of subsidy from detrital food webs to shrub spiders and how different spider feeding guilds used the subsidy of prey from detrital food webs. We measured the relative importance of the subsidy for the spider feeding guilds, using the ratios of stable isotopes of C (δ13C), and N (δ15N) and C isotope discrimination (Δ14C). Diet age was calculated from Δ14C values, because old diet ages of spiders indicate that the spiders consume prey from detrital food sources. Dominant aerial prey (Diptera) had a distinctively old diet age compared with arboreal prey, which indicates that aerial prey were subsidized from detrital food webs. Sit-and-wait spiders tended to have an older diet age than active hunting spiders, which indicates that sit-and-wait spiders depended more on subsidies. Diet age varied only slightly for spiders in stands of different ages, indicating that rates at which spiders use grazing and detrital prey are probably determined more by foraging strategies and not by stand age. A dominance of sit-and-wait predators will lead to higher detrital subsidy inputs in shrub habitats. This study highlights the effect of shrub spider community structure (feeding guild composition) on the volume of the subsidy received from the detrital food web.

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Acknowledgements

We thank Mr Hajime Yamagata for facilitating our work at the OFR. Members of the Community Dynamics and Insect Ecology Laboratories in the Forestry and Forest Products Research Institute, particularly Dr Takenari Inoue, provided us with site information. We are also grateful for assistance from Drs Shoji Naoe (CER), Naoto F. Ishikawa (CER), and Zin’ichi Karube (NIES). This study was financially supported by the Global Environment Research Fund (F–073), the Research Institute for Sustainable Humanosphere, the Japan Society for the Promotion of Science (JSPS; no. 19681002, 22370011, 23657021) and a Grant-in-Aid for JSPS Fellows (no. 22–978).

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Correspondence to Takashi F. Haraguchi.

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Communicated by Matthias Schaefer.

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Haraguchi, T.F., Uchida, M., Shibata, Y. et al. Contributions of detrital subsidies to aboveground spiders during secondary succession, revealed by radiocarbon and stable isotope signatures. Oecologia 171, 935–944 (2013). https://doi.org/10.1007/s00442-012-2446-1

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