Andrew Bush's Research Page
Changes in ecospace use though the history of animal life
Recognizing & reconstructing patchy faunal gradients from the fossil record
Using an ecologic ordination technique called FSPA, I can detect the presence of patchiness along onshore-offshore faunal gradients in the fossil record. The example below shows an ecologic ordination produced by FSPA of fossil data collected from the Upper Devonian of Virginia by Rod Brame. Each branch of this ordination is a sub-gradient along the major onshore-offshore gradient in water depth and energy that existed in the Devonian sea. Further analyses of these data indicate that patchiness existed in both onshore and offshore habitats. Work with Gwen Daley on the Pliocene of Virginia indicates that patchiness was present there, as well. This method should give us a better understanding of the environmental factors that control the distrubutions of fossil taxa and, in some cases, could indicate the presence of environmental variations undetected by traditional sedimentological methods.
Stratigraphy, paleontology, & extinction in the Upper Devonian of New York