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Title: First records and potential palaeoecological significance of Dianella (Xanthorrhoeaceae), an extinct representative of the native flora of Rapa Nui (Easter Island).
Author: Cañellas Boltà, Núria
Rull del Castillo, Valentí
Sáez, Alberto
Prebble, Matthew
Margalef Marrasé, Olga
Keywords: Paleoecologia
Issue Date: 2014
Publisher: Springer Verlag
Abstract: Easter Island, a remote island in the Pacific Ocean, is currently primarily covered by grasslands, but palaeoecological studies have shown the former presence of different vegetation. Much of its original biota has been removed during the last two millennia, most likely by human activities, and little is known about the native flora.Macrofossil and pollen analyses of a sediment core from the Raraku crater lake have revealed the occurrence of a plant that is currently extinct from the island: Dianella cf. intermedia/adenanthera (Xanthorrhoeaceae), which grew and disappeared at the Raraku site long before human arrival. The occurrence of Dianella within the Raraku sedimentary sequence (between 9.4 and 5.4 cal. kyr B.P.) could have been linked to the existence of favorable palaeoenvironmental conditions (peatland rather than the present-day lacustrine environment) during the early to mid Holocene. This finding contributes new knowledge about indigenous plant diversity on Easter Island and reinforces the usefulness of further macrofossil and pollen analyses to identify native species on Easter Island and elsewhere.
Note: Versió postprint del document publicat a: DOI 10.1007/s00334-014-0432-8
It is part of: Vegetation History and Archaeobotany, 2014, vol. 23, p. 331-338
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ISSN: 0939-6314
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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