. The ecology of deep and shallow coral reefs : results of a workshop on coral reef ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983. Coral reef ecology. DISTRIBUTION OF SWEEPER TENTACLES ON MONTASTRAEA CAVERNOSA Elizabeth A. Chornesky Division of Biological Sciences, The Univ. of Texas, Austin 78712 Susan L. Willi ams Mar. Sci. Res. Ctr., State Univ. of New York, Stony Brook, NY 11794 ABSTRACT I spac cni d desc but the swee whic enco cong both of s enco n d i e, s ae, ri be deve Cari per h do unte ener the weep unte rect ome s 0 r sw d thu 1 op a b
. The ecology of deep and shallow coral reefs : results of a workshop on coral reef ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983. Coral reef ecology. DISTRIBUTION OF SWEEPER TENTACLES ON MONTASTRAEA CAVERNOSA Elizabeth A. Chornesky Division of Biological Sciences, The Univ. of Texas, Austin 78712 Susan L. Willi ams Mar. Sci. Res. Ctr., State Univ. of New York, Stony Brook, NY 11794 ABSTRACT I spac cni d desc but the swee whic enco cong both of s enco n d i e, s ae, ri be deve Cari per h do unte ener the weep unte rect ome s 0 r sw d thu 1 op a bbean tenta not rs . i c sp numb er te r. com peti p e c i e s eeper t s f ar , s compe reef c c 1 e s d i necessa Neverth eci es M er of p ntacles. ase INTRODUCTION Reef corals are known to use a variety of mechanisms to compete for limited substrate space in crowded reef environments. Two of the best described are the use of mesenterial filaments (Lang, 1971, 1973; Sheppard, 1979) or of "sweeper tentacles" (Richardson, et al., 1979; Wellington, 1980; Bak , _et _al_., 1982; Chornesky, 1983~J by some corals to damage the tissues of neighboring corals. Mesenterial filaments are normally present in all polyps of every coral. When corals of different species are placed into direct contact, these digestive filaments are deployed rapidly and extracoelenteric digestion of opponent tissues may take place within hours (Lang, 1971, 1973; Sheppard, 1979). The immediate "winner" (, the animal remaining undamaged) in such interactions is generally predictable among various species pairs. Unlike mesenterial filaments, sweeper tentacles (elongate tentacles with specialized cnidae) are found only on certain species of coral (see Lewis and Price, 1975; Bak and Elgershuizen, 1976). Moreover, within these species, sweepers may not be present on all colonies, and, when present, may be erratically distributed over the colony surface. On some corals, sweeper tentacles develop
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