. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. AGING IN MODULAR ORGANISMS 273 Q CO +1 CT> CD CD CO CD Q_ O SI. CL O 100 80 60 40 20. 10 15 Brown Bodies per zooid FIGURE 3. The percentages of zooids actively feeding in sections of Steginoporella colonies plotted against the average number of brown bodies per zooid in those colony sections. Each point represents an average of daily observations over five consecutive days and an average of the brown bodies in 10 to 15 zooids (Spearman rank correlation, P < ). of older colony areas. In fact, older areas of Steginop
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. AGING IN MODULAR ORGANISMS 273 Q CO +1 CT> CD CD CO CD Q_ O SI. CL O 100 80 60 40 20. 10 15 Brown Bodies per zooid FIGURE 3. The percentages of zooids actively feeding in sections of Steginoporella colonies plotted against the average number of brown bodies per zooid in those colony sections. Each point represents an average of daily observations over five consecutive days and an average of the brown bodies in 10 to 15 zooids (Spearman rank correlation, P < ). of older colony areas. In fact, older areas of Steginoporella are more commonly overgrown by other organisms than are younger, distal colony sections. Thus, older sections of Steginoporella probably contribute less to the colony as a whole, and are more likely to be lost to encroachment by competitors or settlement by fouling organisms than are younger colony sections. Lesion distribution and regeneration Ninety-five lesions were observed in 21 Steginoporella colonies. Colony areas visually characterized as "fouled" exhibit, on average, a higher percentage of dam- aged zooids () than do areas characterized as "unfouled" (; P < .001 test of percentages, Sokal and Rohlf [1969]) (Table I). Margins bordering older colony areas were nearly always (97%) shattered whereas only 24%. of the margins of younger colony sections were broken (P < ; Wilcoxon 2-sample test) (Table I). Experimentally placed lesions in Steginoporella can be grouped into two cate- gories: those which began regeneration almost immediately (within 3-6 days), and those which only slowly regenerated (if at all). Lesions in this latter class were found to be those visually characterized as "fouled", and were always in proximal colony areas. Furthermore, 95% had more than 3 brown bodies per zooid. By contrast, 90% of the lesions which quickly regenerated were in distal, unfouled colony sections and had fewer than 3 brown bod
Size: 2299px × 1087px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
