. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 288 JOHNSTON, JOKIEL, BIGGER, AND HILDEMANN 28-i 24- 20- 16- 12- 8 - HL 4 - Q. Q' JO n> Q o D Q. Q o. D 22 23 24 25 26 27 28 Temperature °C FIGURE 3. Relationship between mean morning temperature and estimated parametric median reaction time for Montipora verrucosa first-set grafts (solid circles), M. verrucosa second-set grafts (open circles), Callyspongia diffusa first-set grafts (solid squares) and C diffusa second-set grafts (open squares). matches at these loci but also on the individual properties of each mismatched
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 288 JOHNSTON, JOKIEL, BIGGER, AND HILDEMANN 28-i 24- 20- 16- 12- 8 - HL 4 - Q. Q' JO n> Q o D Q. Q o. D 22 23 24 25 26 27 28 Temperature °C FIGURE 3. Relationship between mean morning temperature and estimated parametric median reaction time for Montipora verrucosa first-set grafts (solid circles), M. verrucosa second-set grafts (open circles), Callyspongia diffusa first-set grafts (solid squares) and C diffusa second-set grafts (open squares). matches at these loci but also on the individual properties of each mismatched gene; some genes, or rather their gene products, may provoke a more vigorous cytotoxic reaction either by an allogeneic graft partner, or directed at an allogeneic graft partner (Snell et al., 1976). Our previous experiments with corals and sponges (Hildemann, Bigger, Johnston, et al., 1980; Hildemann, Bigger, Jokiel, et al., 1980; Hildemann, Johnston, et al., 1980) imply that both are highly polymorphic at multiple histocompatibility loci, and also that they can sometimes be characterized either as "killers" or as particularly susceptible individuals. Although certain genotypes may have an intraspecific competitive advantage at a given temperature, environmental temperatures fluctuate in the short and long terms. It is assumed that a high degree of genetic polymorphism within a population insures the preservation of the species despite extreme temperature perturbations (cf. Weins, 1977; Shick and Lamb, 1977). Various attempts have been made to explain how diversity is maintained in coral reef environments (, Jackson and Buss, 1975; Buss, 1976; Connell, 1976). Although most of the discussion has been concerned with interspecific diversity, many of the concepts are transferable to intraspecific diversity (genetic polymor- phism). In the absence of some intervening factors, a simple ranked hierarchy of allograft reactivity, such that individual A out-competes indi
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
