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Integrative and Comparative Biology Advance Access originally published online on September 18, 2007
Integrative and Comparative Biology 2007 47(6):880-891; doi:10.1093/icb/icm089
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© The Author 2007. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. All rights reserved. For permissions please email: journals.permissions@oxfordjournals.org.

Metabolic temperature compensation and coevolution of locomotory performance in pteropod molluscs

Brad A. Seibel1,*, Agnieszka Dymowska*,{dagger} and Joshua Rosenthal{ddagger}
*Department of Biological Sciences, University of Rhode Island, Biological Sciences Center, 100 Flagg Road, Kingston, RI 02881, USA; {dagger}Department of Molecular Biosciences, University of Oslo, PO Box 1041, N-0316 Oslo, Norway; {ddagger}Institute of Neurobiology, University of Puerto Rico-Medical Sciences Campus, 201 Blvd. del Valle, San Juan, PR 00901, Puerto Rico

Correspondence: 1E-mail: seibel{at}uri.edu

Gymnosomatous pteropods are highly specialized planktonic predators that feed exclusively on their thecosomatous relatives. Feeding behavior and the morphology of gymnosome feeding structures are diverse and have evolved in concert with the size, shape, and consistency of the thecosome shell. Here, we show that the metabolic capacity and locomotory behaviors of gymnosomes are similarly diverse and vary with those of their prey. Both gymnosomes and thecosomes range from gelatinous sit-and-wait forms to active predators with high-performance locomotory muscles. We find more than 10-fold variation in size-adjusted and temperature-adjusted metabolic rates within both the Gymnosomata and Thecosomata and a strong correlation between the metabolic rates of predators and of prey. Furthermore, these characteristics are strongly influenced by environmental parameters and predator and prey converge upon similar physiological capacities under similar selection. For example, compensation of locomotory capacity in cold waters leads to elevated metabolic rates in polar species. This highly coevolved system is discussed in terms of a predator–prey "arms race" and the impending loss of both predator and prey as elevated atmospheric carbon dioxide levels threaten to dissolve prey shells via oceanic acidification.


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