Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-26T05:38:47.881Z Has data issue: false hasContentIssue false
  • English
  • Français

The role of within-species differentiation in macroevolution of Chesapeake Group bivalves

Published online by Cambridge University Press:  08 April 2016

Patricia H. Kelley
Patricia H. Kelley*
Affiliation:
Department of Geology and Geological Engineering, The University of Mississippi, University, Mississippi 38677
Get access Rights & Permissions [Opens in a new window]

Abstract

Discriminant function analysis is used to examine the role of within-species differentiation in macroevolution of four Miocene bivalve genera. According to the punctuational model, macroevolution is decoupled from microevolution; within-species trends may be unrelated to between-species differences. The reductionist alternative suggests that intraspecific (primarily geographic) differentiation is the basis of macroevolution. If macroevolution depends on within-species differentiation, discriminant function analysis should separate interspecific and intraspecific populations of a genus using the same set of characters.

Chesapecten macroevolution apparently involved within-species differentiation. Shell length, height, and posterior auricle length differentiate geographic populations within species as well as interspecific populations. Results for Astarte, Anadara, and Eucrassatella are more consistent with the punctuational model. Characters which readily separate species of a genus are much less successful at differentiating intraspecific populations. Rank correlation techniques indicate that, for all three genera, the order of importance of characters in interspecific discrimination is not significantly related to their order in intraspecific discrimination. Decoupling of macroevolution from microevolution is implied for these taxa.

Type
Research Article
Information
Paleobiology , Volume 9 , Issue 3 , Summer 1983 , pp. 261 - 268
Copyright
Copyright © The Paleontological Society 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

Bock, W. J. 1979. The synthetic explanation of macroevolutionary change—a reductionistic approach. Bull. Carnegie Mus. Nat. Hist. 13:20–69.Google Scholar
Brande, S. 1979. Biometric analysis and evolution of two species of Mulinia (Bivalvia: Mactridae) from the late Cenozoic of the Atlantic Coastal Plain. 228 pp. Ph.D. diss.; State Univ. New York, Stony Brook.Google Scholar
Gernant, R. E. 1970. Paleoecology of the Choptank Formation (Miocene) of Maryland and Virginia. Rept. Invest. Md. Geol. Surv. 12:1–90.Google Scholar
Gould, S. J. and Eldredge, N. 1977. Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology. 3:115–151.Google Scholar
Kelley, P. H. 1979. Mollusc lineages of the Chesapeake Group (Miocene). 220 pp. Ph.D. thesis; Harvard Univ.Google Scholar
Kelley, P. H. 1983. Evolutionary patterns of eight Chesapeake Group molluscs: evidence for the model of punctuated equilibria. J. Paleontol. 57:581–598.Google Scholar
Kelley, P. H.In press. Multivariate analysis of evolutionary patterns of seven Miocene Chessapeake Group molluscs. J. Paleontol.Google Scholar
Kidwell, S. M. 1982. Stratigraphy, invertebrate taphonomy, and depositional history of the Calvert and Choptank Formations, Atlantic Coastal Plain. 514 pp. Ph.D. thesis; Yale Univ.; New Haven, Conn.Google Scholar
Levinton, J. S. and Simon, C. M. 1980. A critique of the punctuated equilibria model and implications for the detection of speciation in the fossil record. Syst. Zool. 29:130–142.Google Scholar
Shattuck, G. B. 1904. Geological and paleontological relations with a review of earlier investigations. Pp. xxxiii–cxxxvii. In: Maryland Geol. Surv. Miocene.Google Scholar
Simpson, G. G., Roe, A., and Lewontin, R. C. 1960. Quantitative Zoology, rev. ed.440 pp. Harcourt, Brace & Co.; New York.Google Scholar
Stanley, S. M. 1975. A theory of evolution above the species level. Proc. Natl. Acad. Sci. 72:646–650.CrossRefGoogle ScholarPubMed
Ward, L. W. and Blackwelder, B. W. 1975. Chesapecten, a new genus of Pectinidae (Mollusca:Bivalvia) from the Miocene and Pliocene of Eastern North America. U.S. Geol. Surv. Prof. Pap. 861:1–21.Google Scholar