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Article: A fossil record of developmental events: Variation and evolution in epidermal cell divisions in ostracodes

TitleA fossil record of developmental events: Variation and evolution in epidermal cell divisions in ostracodes
Authors
Issue Date2010
PublisherBlackwell Publishing, Inc. The Journal's web site is located at http://www.blackwellpublishing.com/journals/EDE
Citation
Evolution And Development, 2010, v. 12 n. 6, p. 635-646 How to Cite?
AbstractThe carapaces of some ostracode taxa bear reticulate skeletal ridges that outline underlying epidermal cells. This anatomy allows one to identify homologous cells across individuals, to infer the modal sequence of cell divisions that occurs over ontogeny, and to identify individuals with variant cell patterns (emg., additional or missing cell divisions), even in fossils. Here we explore the variational properties and evolutionary history of this developmental system in the deep-sea ostracode genus Poseidonamicus. Using a sample of over 2000 specimens to capture variation in cell division sequence, we show that phenotypic variation in this system is highly structured: some variants, regions of the carapace, and lineages are much more variable than others. Much of the differences in variation among cells can be attributed to the molt stage in which cells take their final form-cell divisions occurring later in ontogeny are more variable than those earlier. Despite ample variation, only two evolutionary changes in the sequence of cell divisions occur over the 40 Myr history of this clade. The evolutionary changes that do occur parallel the two most common intraspecific variants, suggesting that developmental structuring of variation can have long-term evolutionary consequences. Analysis of the most common variant over the last two molt stages suggests that it suffers a fitness disadvantage relative to the modal form. Such normalizing selection may contribute to the evolutionary conservativeness of this developmental system in the Ostracoda. © 2010 Wiley Periodicals, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/132784
ISSN
2015 Impact Factor: 2.169
2015 SCImago Journal Rankings: 1.614
ISI Accession Number ID
Funding AgencyGrant Number
Smithsonian Marine Science fellowship
Funding Information:

We thank D. Erwin for suggestions on a previous version of the manuscript. For access to specimens, we thank G. Miller, T. Cronin, and R. Benson. S. Whittaker and G. Miller were instrumental in the SEM photography. M. Yasuhara was supported by a Smithsonian Marine Science fellowship.

References

 

DC FieldValueLanguage
dc.contributor.authorHunt, Gen_HK
dc.contributor.authorYasuhara, Men_HK
dc.date.accessioned2011-03-28T09:29:03Z-
dc.date.available2011-03-28T09:29:03Z-
dc.date.issued2010en_HK
dc.identifier.citationEvolution And Development, 2010, v. 12 n. 6, p. 635-646en_HK
dc.identifier.issn1520-541Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/132784-
dc.description.abstractThe carapaces of some ostracode taxa bear reticulate skeletal ridges that outline underlying epidermal cells. This anatomy allows one to identify homologous cells across individuals, to infer the modal sequence of cell divisions that occurs over ontogeny, and to identify individuals with variant cell patterns (emg., additional or missing cell divisions), even in fossils. Here we explore the variational properties and evolutionary history of this developmental system in the deep-sea ostracode genus Poseidonamicus. Using a sample of over 2000 specimens to capture variation in cell division sequence, we show that phenotypic variation in this system is highly structured: some variants, regions of the carapace, and lineages are much more variable than others. Much of the differences in variation among cells can be attributed to the molt stage in which cells take their final form-cell divisions occurring later in ontogeny are more variable than those earlier. Despite ample variation, only two evolutionary changes in the sequence of cell divisions occur over the 40 Myr history of this clade. The evolutionary changes that do occur parallel the two most common intraspecific variants, suggesting that developmental structuring of variation can have long-term evolutionary consequences. Analysis of the most common variant over the last two molt stages suggests that it suffers a fitness disadvantage relative to the modal form. Such normalizing selection may contribute to the evolutionary conservativeness of this developmental system in the Ostracoda. © 2010 Wiley Periodicals, Inc.en_HK
dc.languageengen_US
dc.publisherBlackwell Publishing, Inc. The Journal's web site is located at http://www.blackwellpublishing.com/journals/EDEen_HK
dc.relation.ispartofEvolution and Developmenten_HK
dc.titleA fossil record of developmental events: Variation and evolution in epidermal cell divisions in ostracodesen_HK
dc.typeArticleen_HK
dc.identifier.emailYasuhara, M: yasuhara@hku.hken_HK
dc.identifier.authorityYasuhara, M=rp01474en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1111/j.1525-142X.2010.00448.xen_HK
dc.identifier.pmid21040429-
dc.identifier.scopuseid_2-s2.0-78049466030en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78049466030&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume12en_HK
dc.identifier.issue6en_HK
dc.identifier.spage635en_HK
dc.identifier.epage646en_HK
dc.identifier.eissn1525-142X-
dc.identifier.isiWOS:000283691700010-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridHunt, G=8502893500en_HK
dc.identifier.scopusauthoridYasuhara, M=7102069020en_HK
dc.identifier.citeulike8209802-

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