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Marine Ecology Progress Series

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MEPS 365:25-34 (2008)  -  DOI:

Temperature constraints on phenotypic plasticity explain biogeographic patterns in predator trophic morphology

Ashley K. Baldridge1,2, L. David Smith1,*

1Department of Biological Sciences, Smith College, Northampton, Massachusetts 01063, USA
2Present address: Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA
*Corresponding author. Email:

ABSTRACT: Phenotypic plasticity in feeding structures allows invasive predators to adjust to variation in prey defenses, but the abiotic milieu may constrain the extent or rate of the response. In the northwest Atlantic Ocean, the introduced European green crab Carcinus maenas encounters latitudinal differences in shell thickness of its snail prey, Littorina obtusata, and water temperature. To determine whether claw size in this heterochelous species responds to broad-scale differences in prey armor or water temperature, we reared C. maenas on a diet of thick- or thin-shelled L. obtusata at 16 or 10°C. At the higher temperature, crusher claw size increased significantly more at the molt relative to carapace width increase for crabs raised on the thick-shelled rather than thin-shelled diet. The lower temperature inhibited trophic responses in the crusher claw by reducing foraging performance on thick-shelled snails, and lower temperature also prolonged the molt interval. Cutter claw growth showed no diet effect at either temperature. Non-additive responses to multiple cues highlight the importance of testing for phenotypic plasticity over a range of environmental backgrounds and help explain post-invasion biogeographic patterns between an introduced predator and its prey.

KEY WORDS: Phenotypic plasticity · Biological invasions · Biogeography · Trophic plasticity · Carcinus maenas · Littorina obtusata · Water temperature · Ecological arms race

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Cite this article as: Baldridge AK, Smith LD (2008) Temperature constraints on phenotypic plasticity explain biogeographic patterns in predator trophic morphology. Mar Ecol Prog Ser 365:25-34.

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