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    The body size dependence of trophic cascades. 
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    The body size dependence of trophic cascades.

    Volume
    185
    Pagination
    354 - 366
    DOI
    10.1086/679735
    Journal
    Am Nat
    Issue
    3
    Metadata
    Show full item record
    Abstract
    Trophic cascades are indirect positive effects of predators on resources via control of intermediate consumers. Larger-bodied predators appear to induce stronger trophic cascades (a greater rebound of resource density toward carrying capacity), but how this happens is unknown because we lack a clear depiction of how the strength of trophic cascades is determined. Using consumer resource models, we first show that the strength of a trophic cascade has an upper limit set by the interaction strength between the basal trophic group and its consumer and that this limit is approached as the interaction strength between the consumer and its predator increases. We then express the strength of a trophic cascade explicitly in terms of predator body size and use two independent parameter sets to calculate how the strength of a trophic cascade depends on predator size. Both parameter sets predict a positive effect of predator size on the strength of a trophic cascade, driven mostly by the body size dependence of the interaction strength between the first two trophic levels. Our results support previous empirical findings and suggest that the loss of larger predators will have greater consequences on trophic control and biomass structure in food webs than the loss of smaller predators.
    Authors
    DeLong, JP; Gilbert, B; Shurin, JB; Savage, VM; Barton, BT; Clements, CF; Dell, AI; Greig, HS; Harley, CDG; Kratina, P
    URI
    http://qmro.qmul.ac.uk/xmlui/handle/123456789/7007
    Collections
    • School of Biological and Chemical Sciences [1659]
    Language
    eng
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