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Adjusted least-square means (±s.e.) of photosynthesis to respiration (P:R) ratios for six species of sponges. Different letters above each species indicate statistically significant differences in P:R ratios across species as determined by analysis of covariance followed by LSD multiple pairwise comparisons. Abbreviations of species names are identical to Figure 1. N=5 for Acau, Aful, Nere, Nsub and Xboc and N=4 for Cnuc.
