Summary
Competition for empty gastropod shells in a group of three sympatric hermit crabs (Pagurus hirsutiusculus, Pagurus granosimanus, and Pagurus beringanus) was studied in the San Juan Archipelago, Washington State. Estimates of the competitive effects of each species on the others' shell supplies were derived using field data on shell utilization and the results of laboratory experiments to determine rates of acquisition and exchange of shells and preferences for different shell species. Each species experienced approximately an order of magnitude more intraspecific competition than interspecific competition for empty shells. This resulted from differences in preference for shell shapes, shell size use, and habitat use between P. hirsutiusculus and P. granosimanus, and largely from differences in habitat use between P. beringanus and the other two species. Experiments involving the release and recensusing of marked empty shells were used to estimate competitive effects more directly for the interaction between P. hirsutiusculus and P. granosimanus. Results were consistent with the estimates derived from data on resource partitioning. Possible causes of the low levels of interspecific competition are discussed, and results are compared with studies of other organisms that estimated both inter- and intra-specific competition.
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References
Abrams PA (1980a) Some comments on measuring niche overlap. Ecology 61:44–49
Abrams PA (1980b) Resource partitioning and interspecific competition in a tropical hermit crab community. Oecologia (Berlin) 46:365–379
Abrams PA (1981a) Shell fighting and competition between two hermit crab species in Panama. Oecologia (Berlin) 51:84–90
Abrams PA (1981b) Alternative methods of measuring competition applied to two Australian hermit crabs. Oecologia (Berlin) 51:233–240
Abrams PA (1981c) Competition in an Indo-Pacific hermit crab community. Oecologia (Berlin) 51:241–249
Abrams PA (1982) Frequencies of interspecific shell exchange between hermit crabs. J Exp Mar Biol Ecol 61:99–109
Abrams PA (1983) The theory of limiting similarity. Ann Rev Ecol Syst 14:359–376
Abrams PA (1986) Character displacement and niche shift analyzed using consumer-resource models of competition. Theor Popul Biol 29:107–160
Abrams PA (1987) Resource partitioning and competition for shells between intertidal hermit crabs on the outer coast of Washington. Oecologia (Berlin) 72:248–258
Abrams PA, Nyblade CF, Sheldon S (1986) Resource partitioning and competition in a subtidal hermit crab assemblage. Oecologia (Berlin) 69:429–445
Bertness MD (1981) Competitive dynamics of a tropical hermit crab assemblage. Ecology 62:751–761
Connell JH (1980) Diversity and the coevolution of competitors, or the ghost of competition past. Oikos 35:131–138
Connell JH (1983) On the prevalence and relative importance of interspecific competition: evidence from field experiments. Am Nat 122:661–696
Hazlett BA (1966) Social behavior of the Paguridae and Diogenidae of Curacao. Stud Fauna Curacao 23:1–143
Hazlett BA (1981) The behavioral ecology of hermit crabs. Ann Rev Ecol Syst 12:1–22
Kuris AM, Brody MS (1976) Use of principle components analysis to describe the snail shell resource for hermit crabs. J Exp Mar Biol Ecol 22:69–77
Mueller LD, Altenberg L (1985) Statistical inference on measures of niche overlap. Ecology 66:1204–1210
Nyblade CF (1974) Coexistence in sympatric hermit crabs. Ph D thesis, University of Washington, Seattle
Ricklefs RE, Lau M (1980) Bias and dispersion of overlap indices: results of some Monte Carlo simulations. Ecology 61:1019–1024
Rosenzweig ML (1981) A theory of habitat selection. Ecology 62:327–335
Roughgarden J (1983) Competition and theory in community ecology. Am Nat 122:583–601
Schmitt RJ (1985) Competitive interactions of two mobile prey species in a patchy environment. Ecology 66:950–958
Schoener TW (1970) Nonsynchronous spatial overlap of lizards in patchy habitats. Ecology 51:408–418
Schoener TW (1983) Field experiments on interspecific competition. Am Nat 122:240–285
Slatkin M (1978) On the equilibration of fitnesses by natural selection. Am Nat 112:845–859
Spight TM (1977) Availability and use of shells by intertidal hermit crabs. Biol Bull 152:120–133
Spiller DA (1986) Consumptive competition coefficients: an experimental analysis with spiders. Am Nat 127:604–614
Strong DR, Simberloff D, Abele LG, Thistle AB (1984) Ecological communities. Conceptual issues and the evidence. Princeton University Press, Princeton
Underwood AJ (1978) An experimental evaluation of competition between 3 species of intertidal prosobranch gastropods. Oecologia (Berlin) 33:185–202
Vance RR (1972a) Competition and mechanism of coexistence in three sympatric species of intertidal hermit crabs. Ecology 53:1062–1074
Vance RR (1972b) The role of shell adequacy in behavioral interactions involving hermit crabs. Ecology 53:1075–1083
Werner EE, Hall DJ (1977) Competition and habitat shift in two sunfishes. Ecology 58:869–876
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Abrams, P.A. An analysis of competitive interactions between 3 hermit crab species. Oecologia 72, 233–247 (1987). https://doi.org/10.1007/BF00379274
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DOI: https://doi.org/10.1007/BF00379274