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Functional adaptation for unique habitats in the species of intertidal limpets Patelloida

Published online by Cambridge University Press:  06 December 2011

Shizuko Nakai*
Affiliation:
Department of Marine Science and Resources, College of Bioresource Sciences Nihon University, 1866 Kameino Fujisawa, Kanagawa 252–0880Japan
Norio Wakayama
Affiliation:
Research Institute for Integrated Science, Kanagawa University, 2946 Tsuchiya Hiratsuka, Kanagawa 259–1293Japan
Satoshi Chiba
Affiliation:
Department of Ecology and Evolutionary Biology, Graduate School of Life Sciences University of Tohoku, Aobayama, Sendai, 980–8578Japan
*
Correspondence should be addressed to: S. Nakai, Department of Marine Science and Resources, College of Bioresource Sciences Nihon University, 1866 Kameino Fujisawa, Kanagawa 252–0880Japan email: nakai.shizuko@nihon-u.ac.jp

Abstract

Many studies have shown that physical environmental factors cause phenotypic diversity in limpets. However, no studies have documented how substrate conditions (surface shape and topology) affect adhesive force and how they regulate shell morphology in limpets. The intertidal limpet Patelloida pygmaea, having a flat shell, is found exclusively on oyster shells, while P. conulus, with an extremely high shell, is found on Batillaria cumingi. The adhesive force on the B. cumingi was significantly greater in P. conulus than in P. pygmaea, whereas the force on the oyster shell showed no significant difference between these species. On the B. cumingi, a significantly positive correlation was found between adhesive force and volume in P. conulus, and no significant correlation was found in P. pygmaea. In contrast, on the oyster shell, a significant positive correlation was found between adhesive force and volume in both of the two species. These results suggest that the shell of P. conulus becomes higher with increasing own shell size by keeping aperture area relative to body size as small as possible. These morphological differences are most likely due to an adaptation to utilize different habitats and adhere to substrates with different structure and topology.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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