. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M A M J J M A M J J Figure 2. Densities of (a) whelks per m: and (b) barnacles per m: during the experiment. GP denotes Green Point. MB = Maitland Bay, O = controls, • = predators removed, A = recruits removed, A = predators and recruits removed. Means and their standard errors are shown as points and error bars. ;/ = 6 replicate plots. Data for only one site are shown for each shore because the Sites factor was rarely significant in the analyses (see Table II). Acknow ledgments Thanks to A. J. Underwood. P. D. Steinber
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M A M J J M A M J J Figure 2. Densities of (a) whelks per m: and (b) barnacles per m: during the experiment. GP denotes Green Point. MB = Maitland Bay, O = controls, • = predators removed, A = recruits removed, A = predators and recruits removed. Means and their standard errors are shown as points and error bars. ;/ = 6 replicate plots. Data for only one site are shown for each shore because the Sites factor was rarely significant in the analyses (see Table II). Acknow ledgments Thanks to A. J. Underwood. P. D. Steinberg, G. P. Quinn. A. MeGuinness, M. A. O'Donnell, and V. M. Nelson for advice on a draft, and to many others for dis- cussions. Prof. J. Connell and an anonymous reviewer improved the clarity of the manuscript. L. Bragg drew the figures, and was supported by a Macquarie Univer- sity Research Grant. This forms part of a thesis (University of Sydney) supported by a Commonwealth Postgraduate Research Award and a University of Syd- ney Research Grant. Literature Cited Beverton, R. J. H., and S. J. Holt. 1957. On the Dynamics of Ex- ploited Fish Populations. HM Stationery Office. London. Caffey, H. M. 1985. Spatial and temporal variation in the settlement and recruitment of intertidal barnacles. Ecol. Monogr. 55: 313-335. Coe. \\. R. 1953. Resurgent populations of littoral marine inverte- brates and their dependence on ocean currents and tidal currents. Ecology 34: 225-229. Connell, J. H. 1985. The consequences of variation in initial settle- ment vs. post-settlement mortality in rocky intertidal communities. J. Exp. Mar. Biol. Ecol 93: 1 1-45. Dayton. P. K. 1971. Competition, disturbance and community orga- nization: the provision and subsequent utilization of space in a rocky intertidal community. Ecol. Monogr. 41: 351-389. Denley, K. J., and A. .J. Underwood. 1979. Experiments on factors influencing settlement, survival, and growth of two species of barna- cles in New S
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