The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria)
While the importance of allopatric speciation in the fossil record has long been underestimated, phyletic change within single unbranching lineages also occurs. The 50% increase in thoracic width observed in the radiolarian species Pseudocubus vema from an Antarctic deep-sea core is a clear example...
Published in: | Paleobiology |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1975
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0094837300002669 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300002669 |
id |
crcambridgeupr:10.1017/s0094837300002669 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0094837300002669 2024-03-03T08:38:56+00:00 The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria) Kellogg, Davida E. 1975 http://dx.doi.org/10.1017/s0094837300002669 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300002669 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Paleobiology volume 1, issue 4, page 359-370 ISSN 0094-8373 1938-5331 Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics journal-article 1975 crcambridgeupr https://doi.org/10.1017/s0094837300002669 2024-02-08T08:37:02Z While the importance of allopatric speciation in the fossil record has long been underestimated, phyletic change within single unbranching lineages also occurs. The 50% increase in thoracic width observed in the radiolarian species Pseudocubus vema from an Antarctic deep-sea core is a clear example of a long-term phyletic trend in a continuous fossil sequence. Phyletic change in P. vema occurred at varying rates, but changes in the morphologic rate of evolution do not correspond to any obvious breaks in the fossil record such as would be indicated by missing segments of the core's magnetic stratigraphy. Variation in thoracic width, as measured by the coefficient of variation, does not depend on the morphologic rate of evolution, proportional rate of evolution, nor the amount of time required for the width to change by one standard deviation, so much as it depends on whether change was accomplished by addition or removal of extreme phenotypes to or from the population. Article in Journal/Newspaper Antarc* Antarctic Cambridge University Press Antarctic Paleobiology 1 4 359 370 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics Kellogg, Davida E. The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria) |
topic_facet |
Paleontology General Agricultural and Biological Sciences Ecology Ecology, Evolution, Behavior and Systematics |
description |
While the importance of allopatric speciation in the fossil record has long been underestimated, phyletic change within single unbranching lineages also occurs. The 50% increase in thoracic width observed in the radiolarian species Pseudocubus vema from an Antarctic deep-sea core is a clear example of a long-term phyletic trend in a continuous fossil sequence. Phyletic change in P. vema occurred at varying rates, but changes in the morphologic rate of evolution do not correspond to any obvious breaks in the fossil record such as would be indicated by missing segments of the core's magnetic stratigraphy. Variation in thoracic width, as measured by the coefficient of variation, does not depend on the morphologic rate of evolution, proportional rate of evolution, nor the amount of time required for the width to change by one standard deviation, so much as it depends on whether change was accomplished by addition or removal of extreme phenotypes to or from the population. |
format |
Article in Journal/Newspaper |
author |
Kellogg, Davida E. |
author_facet |
Kellogg, Davida E. |
author_sort |
Kellogg, Davida E. |
title |
The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria) |
title_short |
The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria) |
title_full |
The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria) |
title_fullStr |
The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria) |
title_full_unstemmed |
The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria) |
title_sort |
role of phyletic change in the evolution of pseudocubus vema (radiolaria) |
publisher |
Cambridge University Press (CUP) |
publishDate |
1975 |
url |
http://dx.doi.org/10.1017/s0094837300002669 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300002669 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Paleobiology volume 1, issue 4, page 359-370 ISSN 0094-8373 1938-5331 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0094837300002669 |
container_title |
Paleobiology |
container_volume |
1 |
container_issue |
4 |
container_start_page |
359 |
op_container_end_page |
370 |
_version_ |
1792494346335944704 |