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      New records of Early Cretaceous angiosperm pollen from Portuguese coastal deposits: Implications for the timing of the early angiosperm radiation

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      Review of Palaeobotany and Palynology
      Elsevier BV

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          The origin and early diversification of angiosperms

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            Angiosperm diversification and paleolatitudinal gradients in cretaceous floristic diversity.

            The latitudinally diachronous appearance of angiosperm pollen during the Cretaceous is well documented, but the subsequent diversification and accompanying significant changes in floristic dominance have not been assessed quantitatively for a wide range of paleolatitudes. Trend surfaces fitted to within-palynoflora diversity data from 1125 pollen and spore assemblages show that angiosperms first become floristically prominent in low paleolatitude areas( approximately 20 degrees N to 20 degrees S). Non-magnoliid dicotyledons show a similar but slightly delayed pattern of increase and are the principal component of angiosperm diversity from all areas sampled. Monocotyledons and magnoliid dicotyledons are significant primarily in low to middle paleolatitude palynofloras( approximately 50 degrees N to 20 degrees S) during the latest Cretaceous. As angiosperms become increasingly prevalent the importance of most non-angiosperm taxa either decreases or remains unchanged. The only apparent exception is a striking increase in gnetalean diversity concurrent with the initial angiosperm diversification at low paleolatitudes.
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              ECOLOGICAL ASPECTS OF THE CRETACEOUS FLOWERING PLANT RADIATION

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                Author and article information

                Journal
                Review of Palaeobotany and Palynology
                Review of Palaeobotany and Palynology
                Elsevier BV
                00346667
                April 2007
                April 2007
                : 144
                : 1-2
                : 39-76
                Article
                10.1016/j.revpalbo.2005.09.006
                3251788a-d137-48d2-9c68-53d472e70808
                © 2007

                http://www.elsevier.com/tdm/userlicense/1.0/

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