Data from: Predators indirectly induce stronger prey through a trophic cascade

Arie J.P. Spyksma, Nick T. Shears, Richard B. Taylor & Arie J. P. Spyksma
Many prey species induce defences in direct response to predation cues. However, prey defences could also be enhanced by predators indirectly via mechanisms that increase resource availability to prey, e.g. trophic cascades. We evaluated the relative impacts of these direct and indirect effects on the mechanical strength of the New Zealand sea urchin Evechinus chloroticus. We measured crush-resistance of sea urchin tests (skeletons) in (i) two marine reserves, where predators of sea urchins are relatively...
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