Marine Biology

, Volume 156, Issue 12, pp 2591–2599 | Cite as

Abundance, population structure and claw morphology of the semi-terrestrial crab Pachygrapsus marmoratus (Fabricius, 1787) on shores of differing wave exposure

  • Ana Catarina Ferreira SilvaEmail author
  • Sónia Brazão
  • Steve J. Hawkins
  • Richard C. Thompson
  • Diana M. Boaventura
Original Paper


Wave action is known to influence the abundance and distribution of intertidal organisms. Wave action will also determine the duration and suitability of various foraging windows (high-tide and low-tide, day and night) for predation and can also affect predator behaviour, both directly by impeding prey handling and indirectly by influencing prey abundance. It remains uncertain whether semi-terrestrial mobile predators such as crabs which can access intertidal prey during emersion when the effects of wave action are minimal, are influenced by exposure. Here, we assessed the effect of wave action on the abundance and population structure (size and gender) of the semi-terrestrial intertidal crab Pachygrapsus marmoratus on rocky shores in Portugal. The activity of P. marmoratus with the tidal cycle on sheltered and exposed shores was established using baited pots at high-tide to examine whether there was activity during intertidal immersion and by low-tide searches. Because prey abundance varies along a wave exposure gradient on most Portuguese shores and because morphology of crab chelipeds are known to be related to diet composition, we further tested the hypothesis that predator stomach contents reflected differences in prey abundance along the horizontal gradient in wave exposure and that this would be correlated with the crab cheliped morphology. Thus, we examined phenotypic variation in P. marmoratus chelipeds across shores of differing exposure to wave action. P. marmoratus was only active during low-tide. Patterns of abundance and population structure of crabs did not vary with exposure to wave action. Stomach contents, however, varied significantly between shores of differing exposure with a higher consumption of hard-shelled prey (mussels) on exposed locations, where this type of prey is more abundant, and a higher consumption of barnacles on sheltered shores. Multivariate geometric analysis of crab claws showed that claws were significantly larger on exposed shores. There was a significant correlation between animals with larger claws and the abundance of mussels in their stomach. Variation in cheliped size may have resulted from differing food availability on sheltered and exposed shores.


Prey Abundance Carapace Width Exposed Location Portunid Crab Exposed Shore 



We thank M. J. Anderson for statistical support on data analysis and two anonymous reviewers whose suggestions greatly improved this manuscript. A. C. S. was supported by the “Fundação para a Ciência e Tecnologia”, Portugal (PhD grant SFRH/BD/19077/2004). SJH was funded by a NERC Grant In Aid at the Marine Biological Association of the United Kingdom. Hence, this paper also contributes to theme 4 of Oceans 2025, the NERC strategic science programme. This work was done under the FCT (Fundação para a Ciência e Tecnologia) project PDCT/MAR/58544/2004.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Ana Catarina Ferreira Silva
    • 1
    • 2
    Email author
  • Sónia Brazão
    • 3
  • Steve J. Hawkins
    • 2
    • 4
  • Richard C. Thompson
    • 1
  • Diana M. Boaventura
    • 3
    • 5
  1. 1.Marine Biology & Ecology Research GroupUniversity of PlymouthPlymouthUK
  2. 2.Marine Biological Association of the United KingdomPlymouthUK
  3. 3.Laboratório Marítimo da Guia, Centro de Oceanografia da Faculdade de Ciências da Universidade de LisboaCascaisPortugal
  4. 4.School of Ocean SciencesBangor UniversityYnys MonWales, UK
  5. 5.Escola Superior de Educação João de DeusLisbonPortugal

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