Diversity 2013, 5(2), 240-262; doi:10.3390/d5020240
Article

The Species-Area Relationship in the Late Ordovician: A Test Using Neutral Theory

Received: 28 February 2013; in revised form: 28 March 2013 / Accepted: 2 April 2013 / Published: 10 April 2013
(This article belongs to the Special Issue Marine Biodiversity)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The fundamental biodiversity number, θ, as proposed by Hubbell, should be positively correlated with province area. Because θ can be calculated from preserved relative abundance distributions, this correlation can be tested in the fossil record for regions with known provinces. Late Ordovician (443–458 Ma) strata of Laurentia are divided into four geochemically and biologically distinct regions that reflect provinces in the epicontinental sea. We use existing and newly obtained bed-level census data to test whether Hubbell’s θ is positively correlated with the area of these four regions, corresponding roughly to the Appalachian Basin, Cincinnati Arch, Upper Mississippi Valley, and western United States and Canada. Results indicate a positive relationship between province area and θ that suggests the influence of provincial area, among other factors, on diversity. This correlation highlights the inherent link between diversity and abundance structure at local and regional scales, such that changes at one scale will necessarily affect the other. Since diversity at these smaller spatial scales is an important component of global biodiversity, determining the nature of this relationship in the fossil record has implications for understanding how diversity is assembled globally throughout the Phanerozoic.
Keywords: biodiversity; biogeographic provinces; paleoecology; neutral theory
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MDPI and ACS Style

Sclafani, J.A.; Holland, S.M. The Species-Area Relationship in the Late Ordovician: A Test Using Neutral Theory. Diversity 2013, 5, 240-262.

AMA Style

Sclafani JA, Holland SM. The Species-Area Relationship in the Late Ordovician: A Test Using Neutral Theory. Diversity. 2013; 5(2):240-262.

Chicago/Turabian Style

Sclafani, Judith A.; Holland, Steven M. 2013. "The Species-Area Relationship in the Late Ordovician: A Test Using Neutral Theory." Diversity 5, no. 2: 240-262.

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