Figure 1
Least-squared mean P/R values from 11 species of symbiotic Caribbean gorgonians ordered from highest to lowest values. Dashed line defines compensation (where P/R=1.0), and the solid line a conservative threshold for autotrophy (P/R>1.5; (Wilkinson, 1983)). P/R was calculated from at least four pairs (one light, one dark treatment) of similarly sized clonal fragments from independent colonies (n≧4). Error bars represent s.e.m. and letters indicate significant differences between groups as determined by Tukey’s post hoc test (P<0.05). For species abbreviations refer to the Methods section. Colony morphology (not to scale) and calyx depth (to scale in mm) are shown for reference.
