. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 284 JOHNSTON, JOKIEL, BIGGER, AND HILDEMANN 2cm. FIGURE 1. Allogeneic killing in an incompatible parabiotic graft of the sponge, Callyspongia diffusa. A bilateral cytotoxic reaction has exposed the spongin fiber skeletal framework at the contact interface (between apposing arrow heads). identical interclonal grafts at the same temperature were small, as previously shown for C. diffusa (Johnston and Hildemann, in press). In the present experiment, 7 of 24 replicated pairs of first-set M. verrucosa grafts had identical reactio
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 284 JOHNSTON, JOKIEL, BIGGER, AND HILDEMANN 2cm. FIGURE 1. Allogeneic killing in an incompatible parabiotic graft of the sponge, Callyspongia diffusa. A bilateral cytotoxic reaction has exposed the spongin fiber skeletal framework at the contact interface (between apposing arrow heads). identical interclonal grafts at the same temperature were small, as previously shown for C. diffusa (Johnston and Hildemann, in press). In the present experiment, 7 of 24 replicated pairs of first-set M. verrucosa grafts had identical reaction times while 10 more had reaction times within 1-4 days of each other. On the other hand, reaction times for grafts assembled from different interclonal combinations differed considerably: for example, compare mean reaction times between the sponge first-set combinations C3-C15 and C4-C16, and between the coral first-set combinations M4-M16 and M8-M20. Therefore, at a given temperature the cy- totoxic reactivity provoked by allogeneic cell-surface contact among random pairs of sponges or corals was reflected in a continuum of reaction times: some were faster and some were slower depending on the genotypic combination of the in- dividual graft pairs. Certain pairings consistently reacted rapidly at all temperatures while others reacted more slowly. Since the same combinations were replicated at each temperature, we made paired comparisons to look for an overall temperature effect in spite of the variation introduced by different genotypic graft sources. Table IV summarizes the results of paired-comparisons t tests performed on the reaction-time differences for each of the two temperature increments in both first- and second-set grafts, and also on the first-set to second-set differences within each temperature treatment. For both sponges and corals, first-set reaction times decreased significantly over each tem- perature increment, between 23°C and 25°C, and again betwee
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