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Biomass Reallocation between Juveniles and Adults Mediates Food Web Stability by Distributing Energy Away from Strong Interactions

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  • Amanda L Caskenette
  • Kevin S McCann

Abstract

Ecological theory has uncovered dynamical differences between food web modules (i.e. low species food web configurations) with only species-level links and food web modules that include within-species links (e.g. non-feeding links between mature and immature individuals) and has argued that these differences ought to cause food web theory that includes within-species links to contrast with classical food web theory. It is unclear, however, if life-history will affect the observed connection between interaction strength and stability in species-level theory. We show that when the predator in a species-level food chain is split into juvenile and adult stages using a simple nested approach, stage-structure can mute potentially strong interactions through the transfer of biomass within a species. Within-species biomass transfer distributes energy away from strong interactions promoting increased system stability consistent with classical food web theory.

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  • Amanda L Caskenette & Kevin S McCann, 2017. "Biomass Reallocation between Juveniles and Adults Mediates Food Web Stability by Distributing Energy Away from Strong Interactions," PLOS ONE, Public Library of Science, vol. 12(1), pages 1-14, January.
    • Handle: RePEc:plo:pone00:0170725
    DOI: 10.1371/journal.pone.0170725
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    References listed on IDEAS

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    1. Neil Rooney & Kevin McCann & Gabriel Gellner & John C. Moore, 2006. "Structural asymmetry and the stability of diverse food webs," Nature, Nature, vol. 442(7100), pages 265-269, July.
    2. Kevin McCann & Alan Hastings & Gary R. Huxel, 1998. "Weak trophic interactions and the balance of nature," Nature, Nature, vol. 395(6704), pages 794-798, October.
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