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When are leaves good thermometers? A new case for Leaf Margin Analysis
- P. Wilf
- Environmental Science
- 1 July 1997
It is argued here that the simpler, univariate approach will give paleotemperature estimates at least as precise as the multivariate method because (1) the temperature signal in theMultivariate data set is dominated by the leaf-margin character; (2) the additional characters add minimal statistical precision and in practical use do not appear to improve the quality of the estimate.
Late Paleocene–early Eocene climate changes in southwestern Wyoming: Paleobotanical analysis
- P. Wilf
- Environmental Science, Geography
- 1 February 2000
The warmest global temperatures of the Cenozoic Era occurred in early Eocene time, following a warming trend that started in late Paleocene time. The greater Green River Basin of southwestern Wyoming…
Phylogenetic biome conservatism on a global scale
It is shown that biome stasis at speciation has outweighed biome shifts by more than 25:1, by inferring ancestral biomes for an ecologically diverse sample of more than 11,000 plant species from around the Southern Hemisphere.
Eocene Plant Diversity at Laguna del Hunco and Río Pichileufú, Patagonia, Argentina
- P. Wilf, Kirk R. Johnson, N. Cúneo, M. Smith, B. Singer, M. Gandolfo
- Environmental ScienceThe American Naturalist
- 7 April 2005
Diverse floral associations in Patagonia evolved by the Eocene, possibly in response to global warming, and were persistent and areally extensive, suggesting extraordinary richness at low latitudes via the latitudinal diversity gradient.
Correlated terrestrial and marine evidence for global climate changes before mass extinction at the Cretaceous–Paleogene boundary
- P. Wilf, Kirk R. Johnson, B. Huber
- Environmental Science, GeographyProceedings of the National Academy of Sciences…
- 10 January 2003
Paleotemperatures for the last ≈1.1 million years of the Cretaceous are estimated by using fossil plants from North Dakota and employ paleomagnetic stratigraphy to correlate the results to foraminiferal paleoclimatic data from four middle- and high-latitude sites, suggesting a coupling of pCO2 and temperature.
Testing the impact of calibration on molecular divergence times using a fossil-rich group: the case of Nothofagus (Fagales).
It is suggested that increased background research should be made at all stages of the calibration process to reduce errors wherever possible, from verifying the geochronological data on the fossils to critical reassessment of their phylogenetic position.
High Plant Diversity in Eocene South America: Evidence from Patagonia
- P. Wilf, N. Cúneo, Kirk R. Johnson, J. Hicks, S. Wing, J. Obradovich
- Environmental Science, GeographyScience
- 4 April 2003
Radioisotopic and paleomagnetic analyses indicate that the flora was deposited 52 million years ago, the time of the early Eocene climatic optimum, when tropical plant taxa and warm, equable climates reached middle latitudes of both hemispheres.
USING FOSSIL LEAVES AS PALEOPRECIPITATION INDICATORS : AN EOCENE EXAMPLE
Estimates of past precipitation are of broad interest for many areas of inquiry, including reconstructions of past environments and topography, climate modeling, and ocean circulation studies. The…
Late Paleocene fossils from the Cerrejón Formation, Colombia, are the earliest record of Neotropical rainforest
- S. Wing, Fabiany Herrera, C. Jaramillo, Carolina Gómez-Navarro, P. Wilf, C. Labandeira
- Environmental Science, GeographyProceedings of the National Academy of Sciences
- 3 November 2009
Cerrejón megafossils provide strong evidence that the same Neotropical rainforest families have characterized the biome since the Paleocene, maintaining their importance through climatic phases warmer and cooler than present.
Carotenoid Modulation of Immune Function and Sexual Attractiveness in Zebra Finches
All 15 specimens housed at MEF, including exemplar specimens of each species, are housed atMEF, which would be inappropriate for strati-graphic methodology.