The ecology of deep and 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 ecologyofdeepsha00work Year: 1983 this pattern. If a planar colony doubles in area and mass, both its energy intake and metabolic costs could double as well. If Cj >_c2 there is no size asymptote predicted on energetic arounds (Fig. 2B). A similar argument can, however, be used to predict the size of units within a colony (polyps, zooids, etc.) which often show guite determinate growth and a s
The ecology of deep and 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 ecologyofdeepsha00work Year: 1983 this pattern. If a planar colony doubles in area and mass, both its energy intake and metabolic costs could double as well. If Cj >_c2 there is no size asymptote predicted on energetic arounds (Fig. 2B). A similar argument can, however, be used to predict the size of units within a colony (polyps, zooids, etc.) which often show guite determinate growth and a size asymptote (Sebens 1979). On energetic arounds, individuals or colonies (where c^ < C2) might thus grow to an asymptotic size that maximizes their reproduction under a given set of habitat conditions. This asymp- tote will be higher in habitats that are 'better' for either prey availability or physical conditions affecting metabolic rate (Fig. 2C). Mortality rates may be high enough, however, in some habitats that the energetically predicted asymptote is never reached. Mechanisms other than energetics will lead to a habitat-dependent maximum size that is non-asymptotic (growth does not slow and cease). Size-dependent fission ( Sebens 1982) could have such an effect. Size-dependent mortality will also produce a maximum size that can differ between habitats (Fig. 2D). Birkeland (1973) found that seafans in Panama have smaller maximum sizes in habitats with higher wave energy because storm waves tear off large colonies. Octocoral colonies (Alcyonium siderium) at wave exposed sites in New England are larger than at calmer sites, but there is no obvious growth cessation in large colonies at the most exposed sites; storm waves may also set the maximum size in this case. Size-selective predation would produce a similar pattern. In fact, Paine (1976) showed that a bimodal distribution of mussel sizes can arise because of constant seastar predation on most size classes; an esc
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