. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 80 LEONARD G. EPP AND CHARLES F. LYTLE with hydra usually designated in recent years as Chlorohydra viridissima, but often inadequately described. Until Forrest's recent description of Chlorohydra hadleyi, all green hydra were generally assigned to a single species usually called either Chlorohydra viridissima or Hydra viridis. As noted previously, certain of the earlier studies have led to some apparently contradictory results. Some of these contradictions may well be due to differences between strains or species of hydra u
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 80 LEONARD G. EPP AND CHARLES F. LYTLE with hydra usually designated in recent years as Chlorohydra viridissima, but often inadequately described. Until Forrest's recent description of Chlorohydra hadleyi, all green hydra were generally assigned to a single species usually called either Chlorohydra viridissima or Hydra viridis. As noted previously, certain of the earlier studies have led to some apparently contradictory results. Some of these contradictions may well be due to differences between strains or species of hydra used. The recent work of Park et al. (1967) comparing designated strains of the two described species points out a number of distinct morphological and physiological differences between these two green hydras and clearly suggests the possibility of significant differences in the role of algae in the different species. Both Park et al., 1967, and Oschman (1967) provide 120 -, 80 - N CO 40 -. 20 FIGURE 1. Effect of continuous darkness on asexual reproduction of Burnett Green (tri- angles), Kenilworth Green (closed circles), and Kenilworth Albino hydra (open circles). evidence of morphological differences between the algae of different strains of green hydra. The purpose of the present study is to investigate further the interactions between the symbiotic algae and their hosts through an analysis of the effects of light and other factors on asexual reproduction in designated strains of Chloro- hydra viridissima and Chlorohydra hadleyi. MATERIALS AND METHODS Two species of green hydra were used in this study: Chlorohydra viridissima (Pallas 1766) (Burnett Strain) and Chlorohydra hadleyi Forrest, 1959 (Kenil- worth Strain). Initial stocks of both strains were obtained from Dr. Helen D. Park of the National Institute of Arthritis and Metabolic Diseases, Bethesda, Maryland. Clones were subsequently developed from a single individual of each strain and an aposymbiotic clone was develope
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
