Paleocene wind-dispersed fruits and seeds from Colombia and their implications for early Neotropical rainforests
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Department of Biology, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611-7800, USA
Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, Illinois 60022, USA
Smithsonian Tropical Research Institute, Apartado Postal, 0843-03092, Balboa, Ancón, Panamá
Department of Plant Biology, Cornell University, Ithaca, NY 14853, USA
Department of Paleobiology, NHB121, Smithsonian Institution, Washington, D.C. 20013-7012, USA
Online publication date: 2014-12-20
Publication date: 2014-12-20
Acta Palaeobotanica 2014; 54(2): 197-229
Extant Neotropical rainforests are well known for their remarkable diversity of fruit and seed types. Biotic agents disperse most of these disseminules, whereas wind dispersal is less common. Although wind-dispersed fruits and seeds are greatly overshadowed in closed rainforests, many important families in the Neotropics (e.g., Bignoniaceae, Fabaceae, Malvaceae, Orchidaceae, Sapindaceae) show numerous morphological adaptations for anemochory (i.e. wings, accessory hairs). Most of these living groups have high to moderate levels of plant diversity in the upper levels of the canopy. Little is known about the fossil record of wind-dispersed fruits and seeds in the Neotropics. Six new species of disseminules with varied adaptations for wind dispersal are documented here. These fossils, representing extinct genera of Ulmaceae, Malvaceae, and some uncertain families, indicate that wind-dispersed fruit and seed syndromes were already common in the Neotropics by the Paleocene, coinciding with the early development of multistratal rainforests. Although the major families known to include most of the wind-dispersed disseminules in extant rainforests are still missing from the Paleogene fossil record of South and Central America, the new fossils imply that anemochory was a relatively important product and/or mechanism of plant evolution and diversification in early Neotropical rainforests.
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