Power10_DisturbanceFoodChains - Disturbance and food chain...

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1 Disturbance and food chain length: Eel River case history 2 What’s the effect of disturbance (time since disturbance) on food chain length? Observations: Lower trophic levels are generally more susceptible to disturbance mortality Early successional species are generally more edible Pow! Veg V H Herbivs P1 Pred1 P2 Pred2 Trophic level biomass 3 Eel River, Northern California 4 Bed Scouring Flood (January) 5 March 6 June: filamentous green algae (Cladophora glomerata) grow vegetatively from basal pads on boulder and bedrock substrates. Cladophora turfs can be several meters long.
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7 July: algae detach to form floating mats that accumulate in slack water areas and around emergent boulders. 8 August: mats and turfs have both collapsed to stringy, webbed remnants studded with algal ‘tufts’ 9 This architecture is produced by dense infestations of Cladophora by the tuft weaving midge, Pseudochironomus richardsoni ! #$ 10 What role do fish play?
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