Abstract
A population of the bivalve mollusk Tridacna maxima (Röding) from Hron Island, Great Barrier Reef, Australia, was studied by gel electrophoresis, and proved to be highly variable genetically, with an average heterozygosity of about 22%. This compares closely with a population of T. maxima from Enewetak (Eniwetok) Atoll, with an average heterozygosity of about 20%, very high for marine organisms. Enewetak Atoll was the site of a series of nuclear tests. The Heron Island study verifies that the high variability is natural, and supports the hypothesis that species from trophically stable environments tend to be highly variable genetically.
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Avise, J.C., J.J. Smith and F.J. Ayala: Adaptive differentiation with little genic change between two native California minnows. Evolution, Lancaster, Pa. (1975). (In press)
Ayala, F.J., D. Hedgecock, G.S. Zumwalt and J.W. Valentine: Genetic variation in Tridacna maxima, an ecological analog of some unsuccessful evolutionary lineages. Evolution, Lancaster, Pa. 27, 177–191 (1973)
—, J.R. Powell, M.L. Tracey, C.A. Mourão and S. Pérez-Salas: Enzyme variability in the Drosophila willistoni group. IV. Genic variation in natural populations of Drosophila willistoni. Genetics, Austin, Tex. 70, 113–139 (1972)
—, M.L. Tracey, D. Hedgecock and R.C. Richmond: Genetic differentiation during the speciation process. Evolution, Lancaster, Pa. 28, 576–592 (1974)
—, J.W. Valentine, T.E. DeLaca and G.S. Zumwalt: Genetic variability of the Antarctic brachiopod Liothyrella notorcadensis and its bearing on mass extinction hypotheses. J. Paleont. 49, 1–9 (1975)
Bretsky, P.W. and D.M. Lorenz: Adaptive response to environmental stability: a unifying concept in paleoecology. Proc. N. Am. paleont. Conv., Part E, 522–550 (1969)
Grassle, J.F.: Species diversity, genetic variability and environmental uncertainty. In: Fifth European Marine Biology Symposium, pp 28–37. Ed. by B. Battaglia, Padova, Italy: Piccin Editore 1972
—, Variety in coral reef communites. In: Biology and geology of coral reefs, Vol. 2. Biology, Part 1. pp 247–270. Ed. by O.A. Jones and R. Jones Endean. N.Y.: Academic Press 1973
— and H.L. Sanders: Life histories and the role of disturbance. Deep-Sea Res. 20, 643–659 (1973)
Levins, R.: Evolution in changing environments, 120 pp. Princeton, N.J.: Princeton University Press 1968
Nei, M.: Genetic distance between populations. Am. Nat. 106, 283–292 (1972)
Rosewater, J.: The family Tridacnidae in the Indo-Pacific. Indo-Pacif. Mollusca 1, 347–396 (1965)
Somero, G.N. and M. Soulé: Genetic variation in marine fishes as a test of the niche-variation hypothesis. Nature, Lond. 249, 670–672 (1974)
Valentine, J.W.: Genetic strategies of adaptation. In: Molecular evolution, Ed. by F.J. Ayala. Sunderland, Mass.: Sinauer Ass. In press
Valentine, J.W. and F.J. Ayala: Genetic variability in krill. Proc. natn. Acad. Sci. U.S.A. (In press)
—, G.S. Zumwalt, D. Hedgecock and F.J. Ayala: Mass extinctions and genetic polymorphism in the killer clam, Tridacna maxima. Bull. geol. Soc. Am. 84, 3411–3414 (1973)
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Communicated by J.S. Pearse, Santa Cruz
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Campbell, C.A., Valentine, J.W. & Ayala, F.J. High genetic variability in a population of Tridacna maxima from the Great Barrier Reef. Marine Biology 33, 341–345 (1975). https://doi.org/10.1007/BF00390572
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DOI: https://doi.org/10.1007/BF00390572