. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 330 R. D. GATES ET 1 2 3 No. zooxanthellae released (x l(f) 450 400 350 I 3° 3> <D 250 - Q. V 15 a I 10° 50 -i Pocillopora damicornis 02468 No. of zooxanthellae released (x 106) Figure 6. Appearance of soluble protein in the incubation medium concomitant with release of zooxanthellae by Aipiasia pulchella and Pocillopora damicornis. Control (open squares), cold stressed (closed squares). Line fit with linear regression (Zar, 1984), for A. pulchella, r = (y = + ( • 10~5)x). For P. damicornis. r = 0.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 330 R. D. GATES ET 1 2 3 No. zooxanthellae released (x l(f) 450 400 350 I 3° 3> <D 250 - Q. V 15 a I 10° 50 -i Pocillopora damicornis 02468 No. of zooxanthellae released (x 106) Figure 6. Appearance of soluble protein in the incubation medium concomitant with release of zooxanthellae by Aipiasia pulchella and Pocillopora damicornis. Control (open squares), cold stressed (closed squares). Line fit with linear regression (Zar, 1984), for A. pulchella, r = (y = + ( • 10~5)x). For P. damicornis. r = (y = + ()x). The effect of high and low temperature stress on cell adhesion and cytoskeletal organization has been investi- gated extensively in other systems. Cell adhesion dys- function may result from temperature-induced membrane thermotropism (Melchior and Steim, 1976;Quinn, 1989) and passive influx of ions (Grisham and Barnett. 1973; Larsen et ai. 1988), especially calcium which, in turn, may cause the collapse of actin and the intermediate fil- aments vimentin and cytokeratin (Van Bergen en He- negouwen, 1985; Coakley, 1987; Wachsberger and Coss, 1989; Cress et al., 1990; Walter et ai, 1990). Cytoskeletal elements are co-located with the cytoplasmic domain of cell adhesion molecules (Hirano ct 1987). As elements of the cytoskeleton and cell adhesion proteins function as a whole to maintain the integrity of epithelia, disruption of the former may cause dysfunction of the latter (Tak- eichi, 1988). Alternatively, temperature stress may cause denaturation of proteins involved in cell adhesion (Watson and Morris, 1987; Suzuki and Choi, 1990). Although we have described the cellular entities released after thermal stress in darkness, and a probable underlying mechanism, low salinity (Goreau, 1964; Egana and Di- salvo, 1982) and sedimentation (Acevedo and Goenaga, 1986) also evoke bleaching. Moreover, at high tempera- ture, the bleaching response in
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
