. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 62. P. J. EDMUNDS AND R. D. GATES <20 21-40 <20 21-40 Size Class (mm) Figure 1. The mortality of juvenile corals at 5-6 m depth along the south coast of St. John. Virgin Islands. Juvenile corals at five sites were identified to genus, sized (diameter), and tagged. To determine mortality, each coral was relocated a year later and scored as dead or alive 112). Sample sizes and taxonomic composition of the corals varied each year, but mosl belonged to the genera Porites, Agaricia. Sideraslrea. and Favia. Mortali
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 62. P. J. EDMUNDS AND R. D. GATES <20 21-40 <20 21-40 Size Class (mm) Figure 1. The mortality of juvenile corals at 5-6 m depth along the south coast of St. John. Virgin Islands. Juvenile corals at five sites were identified to genus, sized (diameter), and tagged. To determine mortality, each coral was relocated a year later and scored as dead or alive 112). Sample sizes and taxonomic composition of the corals varied each year, but mosl belonged to the genera Porites, Agaricia. Sideraslrea. and Favia. Mortality was calculated for Porites spp. (including P. ustreoiiles) and for juveniles pooled by taxon (11 genera), and was determined sepa- rately for corals £ 20 mm in diameter (small) and between 21 and 40 mm in diameter (big). Mean annual percentage mortality is displayed (±SE: n = 6 years), and differed significantly between small and big juveniles tor both Porites (1 = df = 10. P = and the pooled taxa (t = df = 10, P = ; statistical analyses were carried out with arcsine-transformed percentage mortality). Porites mortality was calcu- lated using 58 corals between 1996 and 1997. 46 between 1997 and 1998. 28 between 1998 and 1999. 5 between 1999 and 2000. 17 between 2000 and 2001. and 37 between 2001 and 2002: the sample sizes for all juvenile corals were 395. 1X7. 105. 28. 57. and 92. respectively. measures the efficiency of exciting electrons with light energy in PSI1, a decline in ,,, reflects a reduction in the efficiency of the photochemical pathways culminating in carbon fixation (3). Thus, our results show that for P. asireoides. the photochemical pathways of smaller juveniles are slightly more efficient than those in their larger coun- terparts, but that their photophysiology is equally impaired by short exposures to elevated temperatures, at least in corals collected and analyzed in the winter. To explore these size-dependent differences i
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