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Effects of sampling standardization on estimates of Phanerozoic marine diversification
- J. Alroy, C. Marshall, A. Webber
- Environmental Science, GeographyProceedings of the National Academy of Sciences…
- 15 May 2001
A new database of this kind for the Phanerozoic fossil record of marine invertebrates is introduced and four substantially distinct analytical methods that estimate taxonomic diversity by quantifying and correcting for variation through time in the number and nature of inventories are applied.
Comparing palynological abundance and diversity; implications for biotic replacement during the Cretaceous angiosperm radiation
Analysis of an updated and expanded database of North American palynological samples from Cretaceous sediments document a rapid increase in angiosperm diversity and abundance within individual fossil palynofloras (represent- ing local/subregional vegetation).
Abundance Distributions Imply Elevated Complexity of Post-Paleozoic Marine Ecosystems
It is suggested that the end-Permian extinction permanently altered prevailing marine ecosystem structure and precipitated high levels of ecological complexity and alpha diversity in the Meso-Cenozoic.
Spatial patterns of diversity in the sea: bryozoan species richness in the North Atlantic.
Examination of large-scale geographical patterns in species richness for continental shelf bryozoan assemblages in the North Atlantic revealed a latitudinal cline in the regional species richness of North Atlantic bryozoans, and a steady decrease in richness north to 80°N.
Angiosperm Diversification and Paleolatitudinal Gradients in Cretaceous Floristic Diversity
As angiosperms become increasingly prevalent the importance of most non-angiosperm taxa either decreases or remains unchanged, and the only apparent exception is a striking increase in gnetalean diversity concurrent with the initial angiosperm diversification at low paleolatitudes.
The ‘Tully monster’ is a vertebrate
A combination of characters, supported by phylogenetic analysis, identifies Tullimonstrum as a vertebrate, and places it on the stem lineage to lampreys (Petromyzontida), increasing the known morphological disparity of extinct lampreys.
Quantitative analyses of the early angiosperm radiation
Comparative trends in systematic diversity suggest competitive displacement of cycadophytes and pteridophytes by angiosperms, but current evidence is not sufficient to exclude the probability of a more complex basis for mid-Cretaceous floristic change.
Simple versus complex models of trait evolution and stasis as a response to environmental change
- G. Hunt, M. Hopkins, S. Lidgard
- Environmental Science, BiologyProceedings of the National Academy of Sciences
- 20 April 2015
It is concluded that observed paleontological patterns, including the prevalence of stasis, need not be inconsistent with adaptive evolution, even in the face of unstable physical environments.
Angiosperm diversification and Cretaceous floristic trends: a comparison of palynofloras and leaf macrofloras
In the latest Cretaceous, macrofloras and palynofloras both indicate that "pteridophytes," conifers, and other "gymnosperms" are generally less diverse than angiosperms, whereas conifer diversity shows no marked temporal trend.
Matrotrophy and placentation in invertebrates: a new paradigm
- A. Ostrovsky, S. Lidgard, D. Gordon, T. Schwaha, Grigory Genikhovich, A. Ereskovsky
- BiologyBiological reviews of the Cambridge Philosophical…
- 29 April 2015
It is reported that regardless of the degree of expression, matrotrophy is established or inferred in at least 21 of 34 animal phyla, significantly exceeding previous accounts and changing the old paradigm that these phenomena are infrequent among invertebrates.