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- W2332654410 abstract "The stalked cirripede, Pollicipes polymerus, is one of the commonest animals in the mid-tide region of the more exposed parts of the North American Pacific coast (Ricketts & Calvin 1952). Solitary individuals are rare and, even when present, close examination suggests that they are often the remnant of an extensive population. Solitary individuals have been found in situations where there is considerable abrasion by sand scouring and it is then often possible to trace the gradual degeneration of massive clumps through to isolated animals. Furthermore, in such places Mytilus is similarly affected. Characteristically, the species occurs in dense aggregates usually mixed with Mytilus californianus to form the distinctive Pollicipes (Mitella)-Mytilus community, which covers extensive areas of rocks, boulders and artificial structures (P1. 5, A and B); this association provides shelter for numerous other animals, in particular crustaceans, flat worms, and annelids. The species is usually absent from both sheltered bays and estuaries. The form of the aggregate or clump depends largely upon both the degree of exposure to wave action and the micro-environment. In exposed situations they are dense, with individual peduncles strong, relatively short, and attached over a considerable basal area; in less exposed places where there is much sand the clumps, although still firm and solid, contain much sand as well as entangled debris. In such quieter situations as well as amongst the more sheltered mussel beds, the peduncles are often greatly elongated, have relatively few calcareous scales and taper towards the base (P1. 4B), so that each has only a relatively small area of attachment; these elongated peduncles ramify through the clump and ultimately bring their capitula into a position where, in spite of the constant accumulation of debris, feeding may be effectively carried out (P1. 4C). It may be noted that the development of the deep purple colour of the peduncle seems to be in part dependent upon exposure to light; the more distal parts of the attenuated peduncles in a debris-packed clump are light orange in colour. When the surrounding debris and other animals are taken away so that the base of such a light coloured peduncle is exposed, it turns * I wish to acknowledge leave of absence granted by the Council of the Scottish Marine Biological Association and support from the National Science Foundation (Grant G. 3235 to Professor T. H. Bullock) and the Office of Naval Research (Contract No. NR. 165/142 to Dr D. L. Ray)." @default.
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- W2332654410 date "1960-05-01" @default.
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- W2332654410 title "The Behaviour of the Stalked Intertidal Barnacle Pollicipes polymerus J. B. Sowerby, with Special Reference to its Ecology and Distribution" @default.
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- W2332654410 doi "https://doi.org/10.2307/2276" @default.
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