. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 178 DAVID P. LOHSE Table 3 Results of ANCOVA testing the effects of rotation on growth nt the back of the uncrowded panels Weeks 0-2 Weeks 0-4 Weeks 0-6 Weeks 0-8 Source df MS F df MS F df MS F df MS F Rotate (A) 1 0. 1 1 1 1 1 Site (B) 1 1 1 1 1 Initial 1 1 ** 1 *** 1 * A X B 1 1 1 1 Error 9 8 8 6 Presented here is the reduced model; the interaction ter
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 178 DAVID P. LOHSE Table 3 Results of ANCOVA testing the effects of rotation on growth nt the back of the uncrowded panels Weeks 0-2 Weeks 0-4 Weeks 0-6 Weeks 0-8 Source df MS F df MS F df MS F df MS F Rotate (A) 1 0. 1 1 1 1 1 Site (B) 1 1 1 1 1 Initial 1 1 ** 1 *** 1 * A X B 1 1 1 1 Error 9 8 8 6 Presented here is the reduced model; the interaction terms involving the covariate (initial size) were not significant, so they were eliminated from the analyses. * = P < *** = P < tion for space. In fact, the results of the regression analyses suggest that with the addition of each upstream barnacle should come a small reduction in growth for those down- stream. Thus, the cumulative effect of many upstream in- dividuals could have important consequences for those downstream. Despite the fact that upstream individuals take food from their downstream neighbors, growth on the crowded panels was greater at the back than at the front. Thus crowded individuals did better downstream, where they competed for both space and food, than upstream, where they only com- peted for space. There are three possible explanations for this result. First, previous studies have shown that when competition for space is severe, barnacles alter their mor- phology and grow taller instead of wider (Barnes and Powell. 1950; Bertness et al., 1998). Thus it is possible that, since growth is dependent upon food, those at the front of the panels experienced more intense competition for space than those at the back because more food was available at the front. If true, then most of the growth at the front of the o C/5 06- 04- 02-. panels would have been upwards, rather than outwards, resulting in barnacles that, for a given diameter, would b
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
