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Tempo and mode of morphologic evolution near the origin of the radiolarian lineage Pterocanium prismatium

Published online by Cambridge University Press:  08 April 2016

David Lazarus
David Lazarus*
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
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Abstract

Morphometric examination of cladogenesis and phyletic evolution in two late Neogene sister lineages of marine microfossils (Pterocanium prismatium and P. charybdeum, Radiolaria) from two equatorial Pacific sediment cores was undertaken to better understand the rate of cladogenesis and its relation to subsequent phyletic change. The origin of P. prismatium from P. charybdeum ∼4 ma ago has been estimated to take place over an interval of ∼500,000 yr. Results show that the speciation event consists of two distinct phases. The first phase, cladogenesis, occurred relatively rapidly (on the order of 50,000 yr). A second phase of relatively rapid divergent phyletic evolution away from the common ancestral state followed in both descendant branches and continued for at least 500,000 yr after completion of the cladogenetic event. Net evolutionary rates over the next 2 ma appear to be much lower. Individual characters change by as much as 2 population standard deviations during cladogenesis, and by a total of approximately 3 standard deviations over 2.5 ma of phyletic evolution. Up to 5 population standard deviations of change during ≦ 50,000 yr of cladogenesis, and 7 additional standard deviations of phyletic change over 500,000 yr are observed in multivariate (discriminant function) indices of morphologic difference. The measured pattern does not appear to be either strictly “punctuated” or strictly “gradual,” but instead shows features of both hypotheses.

Type
Articles
Information
Paleobiology , Volume 12 , Issue 2 , Spring 1986 , pp. 175 - 189
Copyright
Copyright © The Paleontological Society 

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References

Literature Cited

Arnold, A. J. 1983. Phyletic evolution in the Globorotalia crassaformis (Galloway and Wissler) lineage: a preliminary report. Paleobiology. 9:390–397.CrossRefGoogle Scholar
Barron, J. A., Nigrini, C. A., Pujos, A., Saito, T., Theyer, F., and Weinreich, N. 1985. Biostratigraphic summary and synthesis of the central Equatorial Pacific, DSDP Leg 85. Pp. 905–934. In: Initial Reports of the Deep Sea Drilling Project. Government Printing Office; Washington, D.C.Google Scholar
Berggren, W. A., Kent, D. V., Flynn, J. J., and Van Couvering, J. A. 1985. Cenozoic Geochronology. Geol. Soc. Am. Bull. 96:1407–1418.Google Scholar
Bookstein, F. L. 1978. The measurement of biological shape and shape change. Lecture Notes in Biomathematics 24. 191 pp. Springer-Verlag; Berlin.Google Scholar
Davis, J. C. 1973. Statistics and Data Analysis in Geology. 550 pp. John Wiley; New York.Google Scholar
Eldredge, N. and Gould, S. J. 1972. Punctuated equilibria: an alternative to phyletic gradualism. Pp. 82–115. In: Schopf, T. J. M., ed. Models in Paleobiology. W. H. Freeman; San Francisco.Google Scholar
Endler, J. A. 1977. Geographic Variation, Speciation, and Clines. Monogr. Pop. Biol. 10. Princeton Univ. Press; Princeton, N.J. Pp. 246.Google Scholar
Gould, S. J. and Eldredge, N. 1977. Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology. 3:115–151.Google Scholar
Hays, J. D. 1970. Stratigraphy and evolutionary trends of radiolaria in North Pacific deep-sea sediments. Geol. Soc. Am. Mem. 126:185–218.Google Scholar
Kellogg, D. E. 1975. The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria). Paleobiology. 1:359–370.Google Scholar
Kellogg, D. E. 1976. Character displacement in the radiolarian genus, Eucyrtidium. Evolution. 29:736–749.Google Scholar
Kellogg, D. E. 1980. Character displacement and phyletic change in the evolution of the radiolarian subfamily Artiscinae. Micro-paleontology. 26:196–210.Google Scholar
Kellogg, D. E. 1983. Phenology of morphologic change in radiolarian lineages from deep-sea cores: implications for macroevolution. Paleobiology. 9:355–362.Google Scholar
Kellogg, D. E. and Hays, J. D. 1975. Microevolutionary patterns in late Cenozoic Radiolaria. Paleobiology. 1:150–160.Google Scholar
Lazarus, D. B. 1983. Speciation in pelagic Protista and its study in the microfossil record: a review. Paleobiology. 9:327–340.Google Scholar
Lazarus, D. B. 1986. Three-dimensional measurement of microfossil morphology. J. Paleontol. 60 in press.Google Scholar
Lazarus, D. B., Scherer, R., and Prothero, D. R. 1985. Evolution of the radiolarian species-complex Pterocanium: a preliminary survey. J. Paleontol. 59:183–220.Google Scholar
Levinton, J. S. 1983. Stasis in progress: the empirical basis of macroevolution. Ann. Rev. Ecol. Syst. 14:103–137.Google Scholar
Malmgren, B. A., Berggren, W. A., and Lohmann, G. P. 1983. Evidence for punctuated gradualism in the Late Neogene Globorotalia tumida lineage of planktonic foraminifera. Paleobiology. 9:377–389.Google Scholar
Malmgren, B. A. and Kennett, J. P. 1981. Phyletic gradualism in a Late Cenozoic planktonic foraminiferal lineage; DSDP Site 284, southwest Pacific. Paleobiology. 7:230–240.CrossRefGoogle Scholar
Moore, T. C. 1973. A method of randomly distributing grains for microscopic examination. J. Sed. Petrol. 43:904–906.Google Scholar
Scott, G. H. 1982. Tempo and stratigraphic record of speciation in Globorotalia punticulata. J. Foraminiferal Res. 12:1–12.CrossRefGoogle Scholar
Stanley, S. M. 1979. Macroevolution: Pattern and Process. 332 pp. Freeman; San Francisco.Google Scholar