. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POST-PALEOZOIC BRYOZOAN CLADE PERSEVERANCE 167. Figure 7. Cyclostome performance in interference competition against functional groups of cheilostomes. plotted as a function of site energy. Performance was measured as proportion of losses in competitive interac- tions. The cheilostome clade incorporates many colony forms, which are categorized here into the functional groups bilaminar (foliaceous sheets), calcareous (heavily calcified sheets), intermediate, thin (membranous sheets) and runner (stolons). The sites (at Lough H
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POST-PALEOZOIC BRYOZOAN CLADE PERSEVERANCE 167. Figure 7. Cyclostome performance in interference competition against functional groups of cheilostomes. plotted as a function of site energy. Performance was measured as proportion of losses in competitive interac- tions. The cheilostome clade incorporates many colony forms, which are categorized here into the functional groups bilaminar (foliaceous sheets), calcareous (heavily calcified sheets), intermediate, thin (membranous sheets) and runner (stolons). The sites (at Lough Hyne. Ireland) are organized along an energy gradient as shown. For more information on sites, functional groups, or species, see Maughan and Barnes (2000). Performance is measured as L/T, so performance increases as L/T declines. The highest measured performance of cyclostomes against cheilostomes was in Alaska (data from Barnes and Dick. 2000). but further analysis suggests that the assessment depends on the method of measurement. Ini- tial (non-standardized) and standardized win-tie scored ranking showed cyclostomes to be medium to poor per- formers against cheilostomes (Table 1). The low propor- tion of wins to total encounters suggested that Patinella (a model cyclostome genus) is a very poor competitor. However, most of the interactions were tied, with the number of wins and losses roughly balancing out. Indeed, the very low proportion of losses was second only to that of the cheilostome Tegella aquilostris. Taken together, these observations indicate that although Patinella nei- ther won nor lost many encounters, it persisted as a member of the assemblage. This emphasizes that over- growth performance is not the only mechanism by which a bryozoan can maintain itself in the community. Data were also subjected to two recognized techniques that reduce bias in mathematical comparisons of competitor performance from accumulated pairwise interactions (de Vries. 1998; Jameson et
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
