Size-frequency distributions along a latitudinal gradient in middle permian fusulinoideans

Zhang, Yichun and Payne, Jonathan L. 2012, Size-frequency distributions along a latitudinal gradient in middle permian fusulinoideans, PLoS One, vol. 7, no. 6, pp. 1-8.

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Title Size-frequency distributions along a latitudinal gradient in middle permian fusulinoideans
Author(s) Zhang, Yichun
Payne, Jonathan L.
Journal name PLoS One
Volume number 7
Issue number 6
Start page 1
End page 8
Total pages 8
Publisher Public Library of Science
Place of publication San Francisco, Calif.
Publication date 2012-06-07
ISSN 1932-6203
Keyword(s) carbonic acid
dissolved oxygen
sea water
Summary Geographic gradients in body size within and among living species are commonly used to identify controls on the long-term evolution of organism size. However, the persistence of these gradients over evolutionary time remains largely unknown because ancient biogeographic variation in organism size is poorly documented. Middle Permian fusulinoidean foraminifera are ideal for investigating the temporal persistence of geographic gradients in organism size because they were diverse and abundant along a broad range of paleo-latitudes during this interval (~275–260 million years ago). In this study, we determined the sizes of Middle Permian fusulinoidean fossils from three different paleo-latitudinal zones in order to examine the relationship between the size of foraminifers and regional environment. We recovered the following results: keriothecal fusulinoideans are substantially larger than nonkeriothecal fusulinoideans; fusulinoideans from the equatorial zone are typically larger than those from the north and south transitional zones; neoschwagerinid specimens within a single species are generally larger in the equatorial zone than those in both transitional zones; and the nonkeriothecal fusulinoideans Staffellidae and Schubertellidae have smaller size in the north transitional zone. Fusulinoidean foraminifers differ from most other marine taxa in exhibiting larger sizes closer to the equator, contrary to Bergmann's rule. Meridional variation in seasonality, water temperature, nutrient availability, and carbonate saturation level are all likely to have favored or enabled larger sizes in equatorial regions. Temporal variation in atmospheric oxygen concentrations have been shown to account for temporal variation in fusulinoidean size during Carboniferous and Permian time, but oxygen availability appears unlikely to explain biogeographic variation in fusulinoidean sizes, because dissolved oxygen concentrations in seawater typically increase away from the equator due to declining seawater temperatures. Consequently, our findings highlight the fact that spatial gradients in organism size are not always controlled by the same factors that govern temporal trends within the same clade.
Language eng
Field of Research 040308 Palaeontology (incl Palynology)
060206 Palaeoecology
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, Zhang, Payne
Persistent URL http://hdl.handle.net/10536/DRO/DU:30049649

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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