. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 286 A. M. ESTES ET AL. bell margin 1 cm 2cm manubrium Figure 8. Distribution of zooxanthellar density (A) and CA activity (B) across the bell radius in field-condition and bleached individuals of Cassiopeu xamachana. See Figure 1 for an explanation of where each tissue sample was taken from across the diameter of the bell. Field- condition animals are represented by black bars; bleached animals are represented by white bars. Mean ± SEM (/; = 13 for field-condition and 4 for bleached animals). Differing lowercase letters abov
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 286 A. M. ESTES ET AL. bell margin 1 cm 2cm manubrium Figure 8. Distribution of zooxanthellar density (A) and CA activity (B) across the bell radius in field-condition and bleached individuals of Cassiopeu xamachana. See Figure 1 for an explanation of where each tissue sample was taken from across the diameter of the bell. Field- condition animals are represented by black bars; bleached animals are represented by white bars. Mean ± SEM (/; = 13 for field-condition and 4 for bleached animals). Differing lowercase letters above bars indicate conditions that were significantly different at P £ Anthopleura elegantissima confirmed that the symbiotic state of the host influences the levels of CA activity in the host tissues (Weis, 1991; Weis and Reynolds, 1999). Like- wise, the presence and levels of CA activity reported here correspond to algal densities in the hell margin tissue of individual C. \ainacluuui under different symbiotic states. Animals, whether freshly collected or repopulated, housed greater numbers of symbionts and had correspondingly higher CA activity within their bell margin tissues than when these same animals were bleached. The correlation between algal density and CA activity extends to other tissues in C. \ciiinichiiiiti as well. Oral arm tissue has been shown to contain 3-fold higher densities of zooxanthellae than whole bell tissue (Blanquet, 1979). This corresponds to our results that show oral arm tissues possess 2-fold higher CA activity. A similar relationship between algal density and CA activity has also been found in sym- biotic anemones and giant clams (Weis et <//., 1989; Verde and McCloskey, 1998; Baillie and Yellowlees, 1998). The underlying reasons for tissue-specific differences in zooxanthellar density are not known, but they may be re- lated to differences in the microenvironments of different tissue types. Higher algal densities found in oral arms may
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