It has been shown that in real food webs, the strongest omnivorous feedback, a three-link positive feedback, is a good indicator of system stability, suggesting that the strongest positive feedback in a food web could be the Achilles heel of stability. However, the complete spectrum of feedbacks in observed food webs has never been analyzed. Here, we have quantified all the feedbacks in 32 soil food webs along a complexity gradient, including trophic feedbacks and feedbacks resulting from recycling of organic matter. We found that, although the maximum omnivorous feedback was rarely the strongest positive feedback in a system, it stood out over longer and stronger feedbacks as the indicator of stability. The results emphasize the importance of small substructures in complex networks.
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In this study, we use the term species in a broad sense to refer to trophic groups of functionally similar species.
Allesina S, Pascual M (2008) Theoretical Ecology 1:55–64
de Ruiter PC, Neutel AM, Moore JC (1995) Energetics, patterns of interaction strengths, and stability in real ecosystems. Science 269:1257–1260
DeAngelis D, Bartell S, Brenkert A (1989) Am Nat 134:778–805
Hofbauer J, Sigmund K (1988) Cambridge University Press, New York, NY(USA) 1988
Holt R, Polis G (1979) Am Nat 149:745–764
Hunt HW, Coleman DC, Ingham ER, Ingham RE, Elliott ET, Moore JC, Rose SL, Reid CPP, Morley CR (1987) The detrital foodweb in a shortgrass praririe. Biol Fertil Soils 3:57
Huxel G, McCann K, Polis G (2002) Ecol Res 17:419–432
Levins R (1974) Ann NY Acad Sci 231:123–138
Levins R (1975) Ecology and evolution of communities. Belknap Press, Cambridge. pp 16–50
May RM (1972) Will a large complex system be stable? Nature 238:413–414
Neutel AM, Heesterbeek JAP, de Ruiter PC (2002) Science 296:1120–1123
Neutel AM, Heesterbeek JAP, van de Koppel J, Hoenderboom G, Vos A, Kaldeway C, Berendse F, de Ruiter PC (2007) Nature 449:559–602
Odum H (1971) Fundamentals of ecology. Wiley, New York, USA
Pimm S, Lawton J (1978) Nature 275:542–544
Schoener TW (1989) Food webs from the small to the large: The Robert H. MacArthur award lecture. Ecology 70(6):1559–1589
Williams R, Berlow E, Dunne J, Barabási A, Martinez N (2002) Proc Natl Acad Sci USA 99:12913
Emily Mitchell was supported by a National Environmental Research Council Ph.D. studentship. Thanks to Mervyn Freeman, Michael Thorne, Peter de Ruiter, and the two anonymous reviewers for helpful comments on this manuscript.
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Mitchell, E.G., Neutel, A. Feedback spectra of soil food webs across a complexity gradient, and the importance of three-species loops to stability. Theor Ecol 5, 153–159 (2012). https://doi.org/10.1007/s12080-011-0143-z
- Food webs
- Loop weight analysis