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Ecophenotypy, temporal and spatial fidelity, functional morphology, and physiological trade-offs among intertidal bivalves

Published online by Cambridge University Press:  30 May 2018

John Warren Huntley ,
James D. Schiffbauer ,
Teresa D. Avila  and
Jesse S. Broce
John Warren Huntley
Affiliation:
Department of Geological Sciences, University of Missouri, 101 Geology Building, Columbia, Missouri 65211, U.S.A. E-mail: [email protected].
James D. Schiffbauer
Affiliation:
Department of Geological Sciences and X-Ray Microanalysis Core Facility, University of Missouri, 101 Geology Building, Columbia, Missouri 65211, U.S.A.
Teresa D. Avila
Affiliation:
Department of Geological Sciences, University of Missouri, 101 Geology Building, Columbia, Missouri 65211, U.S.A. E-mail: [email protected].
Jesse S. Broce
Affiliation:
Department of Geological Sciences, University of Missouri, 101 Geology Building, Columbia, Missouri 65211, U.S.A. E-mail: [email protected].
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Abstract

Ecophenotypic variation in populations is driven by differences in environmental variables. In marine environments, ecophenotypic variation may be caused by differences in hydrodynamic conditions, substrate type, water depth, temperature, salinity, oxygen concentration, and habitat heterogeneity, among others. Instances of ecophenotypic variation in modern and fossil settings are common, but little is known about the influences of time averaging and spatial averaging on their preservation. Here we examine the shell morphology of two adjacent populations, both live collected and death assemblages, of the infaunal, suspension-feeding, intertidal bivalve Leukoma staminea from the well-studied Argyle Creek and Argyle Lagoon locations on San Juan Island, Washington. Individuals in the low-energy lagoon are free to burrow in the fine-grained substrate, while clams in the high-energy creek are precluded from burrowing in the rocky channel. Our results demonstrate variation in size and shape between the adjacent habitats. Lagoon clams are larger, more disk-shaped, and have relatively larger siphons than their creek counterparts, which are smaller, more spherical in shape, and have a relatively shallower pallial sinus. This ecophenotypy is preserved among death assemblages, although with generally greater variation due to time averaging and shell transport. Our interpretation is that ecophenotypic variation, in this case, is induced by differing hydrodynamic regimes and substrate types, cumulatively resulting in physiological trade-offs diverting resources from feeding and respiration to stability and shell strength, all of which have the potential to be preserved in the fossil record.

Type
Articles
Information
Paleobiology , Volume 44 , Issue 3 , August 2018 , pp. 530 - 545
Copyright
© 2018 The Paleontological Society. All rights reserved. 

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Footnotes

*

Present address: School of Earth Sciences, Ohio State University, Columbus, Ohio 43210, U.S.A.

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