Sessile Cirripedes, partly from being attached to surfaces having very different characters, partly from undergoing a varying amount of disintegration, and partly from unknown innate causes, are extremely variable ⋯ As whole groups of specimens often vary in exactly the same manner, it is not easy to exaggerate the difficulty of discriminating species and varieties.
Darwin (1854)
Abstract
Barnacles of the same species (Balanus glandula) show differences both in shell morphology and in their ability to resist crushing from impact at two sites within 8 km of each other which differ in their natural exposure to wave-borne debris (Cattle Point and False Bay, San Juan Island, Washington, USA). In studies performed in 1987, barnacles with shells of a given base diameter at the site exposed to more impact (Cattle Point) were found to have smaller bodies, shorter and thicker shells, and a more protected placement of their opercular valves than barnacles at the protected site. When tested with a standard impact, barnacles from the exposed site were more resistant to crushing both on the first impact and (for those surviving that test) on a second impact 2 wk later. The morphological differences between the two populations may be due to a combination of different shell: body growth rate ratios at the two sites plus passive remodelling of the exposed barnacles by small impacts. The morphological changes at the exposed site, although gained passively, fortuitously provide improved performance in resisting crushing from impact.
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Communicated by M.G. Hadfield, Honolulu
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Pentcheff, N.D. Resistance to crushing from wave-borne debris in the barnacleBalanus glandula . Mar. Biol. 110, 399–408 (1991). https://doi.org/10.1007/BF01344359
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DOI: https://doi.org/10.1007/BF01344359