Scavenger and burrowing features of Hippa pacifica (Dana 1852) on a range of tropical sandy beaches
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Carrion consumption and scavenging are increasingly recognized for their role in community structure and food web dynamics The Pacific mole crab Hippa pacifica (Dana 1852) is a conspicuous scavenger of the swash zone of exposed sandy beaches on islands of the Pacific and Indo-Pacific regions. Our findings on the population structure of this species on Hawaiian beaches differed with the method of sampling used (baited vs. non-baited). The rapid attraction and aggregation of large crabs to bait stations contrasted with the population samples dominated by small crabs collected in the absence of bait. This result suggested that small individuals were excluded by larger crabs when competing for carrion resources. Burrowing velocity (mm s−1) increased with increasing carapace length, meaning that large individuals were more efficient than small crabs in the harsh hydrodynamic environment of the swash. Burrowing assays to exhaustion in laboratory conditions indicated that the ability of the crabs to cope with the harsh environment of the swash zone is a body size-dependent feature, independent of sex or fecundity state. We simulated the potential effect of the hydrodynamic and sediment instability typical of the swash zone of reflective beaches with a consecutive sequence of removals from the sediment. Following this treatment, the burrowing times of the larger crabs were shorter than those of the small individuals. Crab abundance was not related to sand grain size or to beach morphodynamics. Abundance was correlated with the amount of edible organic matter in the sediments, suggesting that H. pacifica is a highly opportunistic species, able to feed on a wider range of potential food sources than expected.
KeywordsBeach Sedimentary Organic Matter Carapace Length Surf Zone Bait Station
This study was funded by the Autonomic Government of Galicia—Xunta de Galicia (Grant: GRC2013-004).
Compliance with ethical standards
Conflict of interest
All the authors declare that they have no conflict of interest.
All applicable international, national and/or institutional guidelines for the care and use of animals were followed.
- Britton JC, Morton B (1994) Food choice, detection, time spent feeding, and consumption by two species of Nassariidae from Monterey Bay, California. Veliger 37:81–92Google Scholar
- Dugan JE, Hubbard DM, McCrary M, Pierson M (2003) The response of macrofauna communities and shorebirds to macrophyte wrack subsidies on exposed sandy beaches of southern California. Est Coastl Shelf Sci 58S:133–148Google Scholar
- Faulkes Z, Paul DH (1997) Digging in sand crabs (Decapoda, Anomura, Hippoidea): interleg coordination. J Exp Biol 200:793–805Google Scholar
- Fichez R (1991) Composition fate of organic matter in submarine cave sediments; implications for the biogeochemical cycle of organic carbon. Oceanol Acta 14:369–377Google Scholar
- Fusaro C (1978) Food availability and egg production: a field experiment with Hippa pacifica Dana (Decapoda; Hippidae). Pac Sci 32:17–23Google Scholar
- Lafrance M, Helga G, Cliche G (2002) Low temperature, but not air exposure slows the recuperation of juvenile scallops, Placopecten magellanicus from exhausting scape responses. J Shellfish Res 21:605–618Google Scholar
- Leroux SJ, Loreau M (2008) Subsidy hypothesis and strength of trophic cascades across ecosystems. Ecol Lett 11:1147–1156Google Scholar
- Lowry OH, Rosebrough NJ (1951) Protein measurement with the folin phenol reagent. J Biol Chem 193:265–275Google Scholar
- Marsh JB, Weinstein WJ (1966) A simple charring method for determination of lipids. J Lipid Res 7:574–576Google Scholar
- Matthews DC (1995) Feeding habits of the sand crab Hippa pacifica (Dana). Pac Sci 9:382–386Google Scholar
- McLachlan A, Jaramillo E, Donn TE, Wessels F (1993) Sandy beach macrofauna communities and their control by the physical environment: a geographical comparison. J Coast Res 15:27–38Google Scholar
- Motulsky HM, Brown RE (2006) Detecting outliers when fitting data with nonlinear regression—a new method based on robust nonlinear regression and the false discovery rate. Bioinformatics 7:123Google Scholar
- Page HM, Willason SW (1982) Distribution patterns of terrestrial hermit crabs at Enewetak Atoll, Marshall Islands. Pac Sci 36:107–117Google Scholar
- Page HM, Willason SW (1983) Feeding activity patterns and carrion removal by terrestrial hermit crabs at Enewetak Atoll, Marshall Islands. Pac Sci 37:151–155Google Scholar
- Sastre MP (1997) Population Fluctuations of Hippa cubensis (Saussure) (Crustacea: anomura: Hippidae) in Puerto Rico. Caribb J Sci 33:115–116Google Scholar
- Schlacher TA, Strydom S, Connolly RM, Schoeman D (2013b) Donor-control of scavenging food webs at the land-ocean interface. PLoS One 8:1–15Google Scholar
- Wenner AM (1977) Food supply, feeding habits, and egg production in Pacific mole crabs (Hippa pacifica Dana). Pac Sci 31:39–47Google Scholar
- Wenner AM, Ricard Y, Dugan J (1987) Hippid crab population structure and food availability on pacific shorelines. Bull Mar Sci 41:221–233Google Scholar