Biotic Interactions in Recent and Fossil Benthic Communities by Michael J.S. Tevesz, Peter L. McCall

By Michael J.S. Tevesz, Peter L. McCall

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If the predators were established infaunal individuals preying on juveniles, then one would not expect to see low densities. Rather one might expect to see high densities and dominance by age classes older and larger than the one presently settling (see Woodin, 1976; Woodin and Jackson, 1979). However, even if such a pattern is seen, predation is not necessarily the cause. It might be caused by larval settlement behavior or emigration of newly settled forms. Adults are, however, known to ingest and disturb juveniles (see Woodin, 1976, for a review and see Woodin, 1974; Brenchley, 1978; Wilson, 1980; Levin, 1981; Highsmith, 1982, for experimental demonstrations of such interactions and resultant patterns).

Roe, 1976). Digging predators are those that excavate their own hole down to the prey item. , Nielsen, 1975; Virnstein, 1977; Woodin, 1978, 1981). One of the potentially important differences between weasel predators and digging predators is that individuals that use the holes of their prey for access may be much less limited by sediment type than are digging predators that must excavate their own holes (see Peterson, 1979). Also, digging predators disrupt the sediment to a much larger extent than do weasel analogs.

Ecol. 60:17-33. Brenchley, G. , and Tidball, J. , 1980, Tube-cap orientations of Diopatra cuprea (Bose) (Polychaeta): The compromise between physiology and foraging, Mar. Behav. Physiol. 7:1-13. Brett, C. , 1978, Attachment structures in the rhombiferan cystoid Caryocrinites and their paleobiological implications,/. Paleontol. 52:717-726. Brett, C. , and Liddell, W. , 1978, Preservation and paleoecology of a Middle Ordovician hardground community, Paleobiology 4:329-348. Burbanck, W. , Pierce, M.

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