DOI: 10.1017/s0094837300013658. Tempo of evolution in a Neogene bryozoan: rates of morphologic change within and across species boundaries

Tempo of evolution in a Neogene bryozoan: rates of morphologic change within and across species boundaries

10.1017/s0094837300013658

Crossref journal-article

Cambridge University Press (CUP)

Paleobiology (56)

Abstract

Inadequacies in stratigraphic resolution or completeness can make true rates of morphologic change through geologic time impossible to estimate precisely. However, relative rates may be sufficient to test whether the tempo of change within species can account for morphologic differences across species boundaries, and hence to distinguish between gradual and punctuated patterns of evolution. The conditions under which these patterns can be distinguished statistically are explored by simulating varying degrees of within-species rate variability relative to across-species morphologic difference. The statistical methods are then applied to multiple-character morphologic data from closely spaced sequential populations of the Neogene bryozoan Metrarabdotos, using discriminant analysis to compare overall morphologies. In nine comparisons of ancestor-descendant species pairs, all show within-species rates of morphologic change that do not vary significantly from zero, hence accounting for none of the across-species difference. In all cases the ratio of within-species fluctuation to across-species difference is low enough to allow the punctuated pattern to be distinguished with virtual certainty. In at least seven of the cases, ancestor species persisted after giving rise to descendants, in conformity with the punctuated equilibrium mode of evolution.

Bibliography

Cheetham, A. H. (1986). Tempo of evolution in a Neogene bryozoan: rates of morphologic change within and across species boundaries. Paleobiology, 12(2), 190â202.

Authors 1

Alan H. Cheetham (first)

References 24 Referenced 115

10.1017/S0094837300007843
{'key': 'S0094837300013658_ref7', 'first-page': '83', 'volume-title': 'Perspectives on Evolution', 'author': 'Gould', 'year': '1982'} / Perspectives on Evolution by Gould (1982)
{'key': 'S0094837300013658_ref9', 'first-page': '19', 'article-title': 'A new approach to resolving the question of speciation in smittinid bryozoans (Bryozoa: Cheilostomata)', 'volume': '3', 'author': 'Humphries', 'year': '1975', 'journal-title': 'Bryozoa 1974'} / Bryozoa 1974 / A new approach to resolving the question of speciation in smittinid bryozoans (Bryozoa: Cheilostomata) by Humphries (1975)
{'key': 'S0094837300013658_ref16', 'first-page': '477', 'volume-title': 'Living and Fossil Bryozoa', 'author': 'Maturo', 'year': '1973'} / Living and Fossil Bryozoa by Maturo (1973)
10.1126/science.222.4620.159
{'key': 'S0094837300013658_ref24', 'first-page': '1', 'volume-title': 'Lophophorates, Notes for a Short Course', 'volume': '5', 'author': 'Winston', 'year': '1981'} / Lophophorates, Notes for a Short Course by Winston (1981)
{'key': 'S0094837300013658_ref3', 'volume-title': 'Bryozoa: Ordovician to Recent', 'author': 'Cheetham'} / Bryozoa: Ordovician to Recent by Cheetham
{'key': 'S0094837300013658_ref22', 'volume-title': 'Macroevolution: Pattern and Process', 'author': 'Stanley', 'year': '1979'} / Macroevolution: Pattern and Process by Stanley (1979)
10.7312/simp93764 / The Major Features of Evolution by Simpson (1953)
10.1017/S0094837300004000
{'key': 'S0094837300013658_ref13', 'first-page': '434', 'volume-title': 'Statistical Package for the Social Sciences', 'author': 'Klecka', 'year': '1975'} / Statistical Package for the Social Sciences by Klecka (1975)
Johnson A. L. A. 1985. Third International Congress of Systematic and Evolutionary Biology, with a symposium on Random and Directed Events in Evolution, convened by the Palaeontological Association and the Linnean Society. Pp. 5–7. Palaeontol. Assoc. Circ. no. 122.
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, Freeman, Cooper; San Francisco. (10.5531/sd.paleo.7)
10.1017/S0094837300002207
10.1017/S0094837300008289
10.1086/628623
10.1017/S0094837300011362
10.1017/S0094837300002347
{'key': 'S0094837300013658_ref18', 'article-title': 'Neogene paleontology in the northern Dominican Republic', 'volume': '89', 'author': 'Saunders', 'year': '1986', 'journal-title': '1. Field surveys, lithology, and age. Bull. Am. Paleontol.'} / 1. Field surveys, lithology, and age. Bull. Am. Paleontol. / Neogene paleontology in the northern Dominican Republic by Saunders (1986)
10.1017/S0094837300002669
10.1146/annurev.ea.12.050184.001333
Cheetham A. H. and Hayek L. C. Manuscript. Phylogeny reconstruction in the Neogene bryozoan Metrarabdotos: a paleontologic evaluation of methodology.
{'key': 'S0094837300013658_ref2', 'first-page': '1', 'article-title': 'Morphology and systematics of the bryozoan genus Metrarabdotos', 'volume': '153', 'author': 'Cheetham', 'year': '1968', 'journal-title': 'Smithsonian Misc. Coll.'} / Smithsonian Misc. Coll. / Morphology and systematics of the bryozoan genus Metrarabdotos by Cheetham (1968)
10.1017/S0094837300011350

Dates

Type	When
Created	9 years ago (July 27, 2016, 1:55 a.m.)
Deposited	6 years, 3 months ago (May 22, 2019, 3:39 p.m.)
Indexed	3 weeks ago (Aug. 2, 2025, 12:39 a.m.)
Issued	39 years, 7 months ago (Jan. 1, 1986)
Published	39 years, 7 months ago (Jan. 1, 1986)
Published Online	9 years, 4 months ago (April 8, 2016)
Published Print	39 years, 7 months ago (Jan. 1, 1986)

Funders 0

None

BibTeX

@article{Cheetham_1986, title={Tempo of evolution in a Neogene bryozoan: rates of morphologic change within and across species boundaries}, volume={12}, ISSN={1938-5331}, url={http://dx.doi.org/10.1017/s0094837300013658}, DOI={10.1017/s0094837300013658}, number={2}, journal={Paleobiology}, publisher={Cambridge University Press (CUP)}, author={Cheetham, Alan H.}, year={1986}, pages={190–202} }

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