Comparing the Geological and Fossil Records: Implications by A McGowan, A B Smith

By A McGowan, A B Smith

The prior decade has witnessed an incredible revival in makes an attempt to split biodiversity indications from biases imposed by means of sampling and the structure of the rock checklist. How huge an issue this poses to our realizing of biodiversity styles is still arguable, and new ways are being constructed to enquire this query. right here palaeobiologists with generally differing methods and pursuits discover the issues of extracting trustworthy info on biodiversity swap from a less than perfect geological checklist. issues lined variety from the applying of information-theoretic techniques that establish directional causal relationships to an in-depth learn of ways geological biases may perhaps impression our realizing of dinosaur evolution. a variety of new insights into the hyperlinks among the land, shallow-marine and deep-sea rock, and fossil files are provided, making this quantity valuable to somebody within the Earth or existence sciences who needs to stay abreast of this dynamic and quickly evolving study area.

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Extra info for Comparing the Geological and Fossil Records: Implications for Biodiversity Studies (Geological Society Special Publication 358)

Example text

4). The conditional IT (Equation 5) quantifies information transfer from sea-level (SL) to fossil diversity (Df ) while excluding their mutual correlation with outcrop (Oc), and this is significant as indicated by the area under the IT curve (SL:Df, Oc; Fig. 4a). On the other hand, IT from outcrop to fossil diversity is not significant beyond the correlation with sea-level (Oc:Df, SL; Fig. 4a). In other words, outcrop does not provide any information on changes in diversity not already contained in the sea-level curve.

E. 50% of nodes will always be consistent and 50% inconsistent), but on a pectinate tree it can vary between zero and one. 0 (Wills 1999; Pol et al. 2004). Benton & Hitchin (1996) did not find a significant relationship between the SCI and balance for their empirical sample of 376 cladograms of echinoderms, fishes and tetrapods. The GER is also subject to logical biases relating to tree balance, and for reasons similar to those afflicting the SCI (Wills 1999). Because Gmax and Gmin are defined by minimally and maximally congruent pectinate trees respectively, it may be impossible to achieve them on more balanced topologies.

1999), Prokoph & Veizer (1999) and later Prokoph et al. (2008) found covariation and matching periodicities in the C and S records, and interpreted these as evidence for the biologically mediated redox coupling of the global carbon and sulphur cycles. In contrast, they obtained only weak and intermittent relationships between O and C, providing little support for a linkage between climate and carbon cycling on this time-scale. Indeed, the correlations among the three time series in terms of first differences are underwhelming (Fig.

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