97747 doi 10.1344/105.000001701 articleid 16965728v10n2p181 eng Coiffard, C. Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung an der Humboldt-Universität Berlin Influence of latitude and climate on spread, radiation and rise to dominance of early angiosperms during the Cretaceous in the Northern Hemisphere Our aim is to evaluate the influence of climate and latitude on the rise to dominance of angiosperms in space and time during the Cretaceous. The main objectives of the study are: 1) to determine whether a relationship existed between plant biogeographical distribution and Cretaceous climate changes; 2) to explore latitude-dependent forcing on early angiosperm ecology; 3) to propose a mechanism explaining the observed stages of radiation in early angiosperms. The study focuses on 18 Cretaceous megafossil localities and reviews on microfossils in the Northern Hemisphere. A database has been compiled using literature and personal unpublished data. The data document occurrences of micro- and megafossil plant remains including spores, pollen grains, leaves and whole plants. They are placed in context through the use of Cretaceous geographical maps and temperature curves or values. There is a clear correlation between latitude and the composition of Cretaceous floras. Latitudinal vegetation belts fluctuated in concert with climate changes during the Cretaceous. Differences in original plant associations may have driven the gradual plant turnover that resulted in the rise to dominance of early angiosperms during the Cretaceous. Cretaceous climate changes created dispersal bottlenecks. Bottlenecks induced the extinction of some plant groups and the radiation of others. Those that successfully radiated continued to spread. Tots els drets reservats http://www.europeana.eu/rights/rr-f/ Anglès Article de fons Early angiosperms Radiation Rise to dominance Palaeobotany Palynology Palaeogeography Palaeoclimates Cretaceous North Hemisphere info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Gómez, B. Universtité de Lyon Vol. 10, Núm. 2 (June 2012), p. 181-188 Geologica acta 1696-5728 8 269232 http://ddd.uab.cat/pub/geoact/geoact_a2012m6v10n2/geoact_a2012m6v10n2p181.pdf 0181 188 June 2 10 geoact_a2012m6v10n2 2012 ARTPUB UAB GEOACT artpubuab oai:ddd.uab.cat:97747 driver