. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IN VIVO ZOOXANTHELLAE HETEROTROPHY 273 30 UJ z O 25 UJ z ** 20 > 15 <r 13 cn u. 10 O "J E CD 5 0. 6 8 10 12 WEEKS OF STARVATION 14 16 FIGURE 1. Survival of dark-maintained starved symbiotic (•) and aposymbiotic (U)A. pulchella. The aposymbiotic animal population underwent a slight increase because of the production of new pedal lacerates. Symbiotic animals progressively declined in number after week 6. aposymbiotic animals starved in darkness produced pedal lacerates thereby increasing the total number of individu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IN VIVO ZOOXANTHELLAE HETEROTROPHY 273 30 UJ z O 25 UJ z ** 20 > 15 <r 13 cn u. 10 O "J E CD 5 0. 6 8 10 12 WEEKS OF STARVATION 14 16 FIGURE 1. Survival of dark-maintained starved symbiotic (•) and aposymbiotic (U)A. pulchella. The aposymbiotic animal population underwent a slight increase because of the production of new pedal lacerates. Symbiotic animals progressively declined in number after week 6. aposymbiotic animals starved in darkness produced pedal lacerates thereby increasing the total number of individuals present. The death of a single aposymbiotic anemone at week 7 was a newly produced pedal lacerate. No further deaths occurred in the aposymbiotic population until week 14, when another new pedal lacerate died. Al- though no quantitative data is available, the aposymbiotic animals appeared to be larger at the end of the experiment than the symbiotic animals. The survival of symbiotic animals starved in darkness was significantly lower than that of aposymbionts (log-rank method adapted from Azen el al, 1977; x2 = ; P < ). No pedal lacerates were produced and the first death (disappearance) of a symbiotic animal occurred at week 6. After week 6 symbiotic animals died at the rate of more than one a week for 6 weeks. During this period of starvation symbiotic animals progressively lost symbiotic algae. The overall percentage of survival at week 15 was 60% for symbiotic anemones and 112% for aposymbionts. The experiment was terminated at week 15 because most of the surviving symbiotic animals were depleted of zooxanthellae. The average number of zooxanthellae per anemone in the symbiotic animals at the end of the experiment was X 105,98% fewer zooxanthellae than a similar light-reared control (Table II). DISCUSSION Reverse translocation The 35S experiments suggest that uptake of host-derived organic materials by zoox- anthellae occurs in laboratory-maintained
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
