Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

Larval Ecology, Geographic Range, and Species Survivorship in Cretaceous Mollusks: Organismic versus Species‐Level Explanations

David Jablonski and Gene Hunt
The American Naturalist
Vol. 168, No. 4 (October 2006), pp. 556-564
DOI: 10.1086/507994
Stable URL: http://www.jstor.org/stable/10.1086/507994
Page Count: 9
  • Read Online (Free)
  • Download ($19.00)
  • Subscribe ($19.50)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Larval Ecology, Geographic Range, and Species Survivorship in Cretaceous Mollusks: Organismic versus Species‐Level Explanations
Preview not available

Abstract

Abstract: The observation that geographic range size in Cretaceous mollusks is correlated with species survivorship and is heritable at the species level has figured repeatedly in discussions of species selection over the past two decades. However, some authors have suggested that the relationship between mode of larval development and geographic range supports the reduction of this example to selection on organismic properties. Our reanalysis of Jablonski's work on heritability at the species level finds that geographic range is significantly heritable (using a randomization test) in both bivalves and gastropods, even within a single larval mode. Further, generalized linear models show that geographic range size is more important than larval mode in predicting extinction probability in both gastropods and bivalves. These results reaffirm the role and heritability of geographic range as a species‐level property that can promote species selection; the model‐based approach applied here may help to operationalize “screening off ” and related approaches to evaluating hierarchical explanations in evolution.

Page Thumbnails

  • Thumbnail: Page 
1
    1
  • Thumbnail: Page 
2
    2
  • Thumbnail: Page 
3
    3
  • Thumbnail: Page 
4
    4
  • Thumbnail: Page 
5
    5
  • Thumbnail: Page 
6
    6
  • Thumbnail: Page 
7
    7
  • Thumbnail: Page 
8
    8
  • Thumbnail: Page 
9
    9