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Title: Climate change facilitated the early colonization of the Azores Archipelago during medieval times
Author: Raposeiro, Pedro Miguel
Hernández Hernández, Armand
Pla Rabés, Sergi
Bao Casal, Roberto
Sáez, Alberto
Shanahan, T.
Benavente, Mario
de Boer, Erik J.
Richter, Nora
Gordon, V.
Marques, Helena
Sousa, P.M.
Souto, M.
Matias, M.G.
Aguiar, N.
Pereira C.
Ritter, Catarina
Rubio de Inglés, María Jesús
Vázquez-Loureiro, D.
Amaral-Zettler, L. A.
Yongsong Huang
van Leeuwen, J.F.M.
Prego, Ricardo
Ruiz-Fernández, A.C.
Sánchez-Cabeza, J.A.
Trigo, Ricardo M.
Giralt Romeu, Santiago
Gonçalves, Vitor
Margalef Marrasé, Olga
Salcedo, M.
Costa, A.C.
Masqué, Pere
Keywords: Canvi climàtic
Climatic change
Issue Date: 4-Oct-2021
Publisher: National Academy of Sciences
Abstract: Humans have made such dramatic and permanent changes to Earth's landscapes that much of it is now substantially and irreversibly altered from its preanthropogenic state. Remote islands, until recently isolated from humans, offer insights into how these landscapes evolved in response to human-induced perturbations. However, little is known about when and how remote systems were colonized because archaeological data and historical records are scarce and incomplete. Here, we use a multiproxy approach to reconstruct the initial colonization and subsequent environmental impacts on the Azores Archipelago. Our reconstructions provide unambiguous evidence for widespread human disturbance of this archipelago starting between 700 -60/+50 and 850 -60/+60 Common Era (CE), ca. 700 y earlier than historical records suggest the onset of Portuguese settlement of the islands. Settlement proceeded in three phases, during which human pressure on the terrestrial and aquatic ecosystems grew steadily (i.e., through livestock introductions, logging, and fire), resulting in irreversible changes. Our climate models suggest that the initial colonization at the end of the early Middle Ages (500 to 900 CE) occurred in conjunction with anomalous northeasterly winds and warmer Northern Hemisphere temperatures. These climate conditions likelyinhibited exploration from southern Europe and facilitated human settlers from the northeast Atlantic. These results are consistent with recent archaeological and genetic data suggesting that the Norse were most likely the earliest settlers on the islands.
Note: Versió postprint del document publicat a:
It is part of: Proceedings of the National Academy of Sciences of the United States of America - PNAS, 2021, vol. 118, num. 41, p. 1-7
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ISSN: 0027-8424
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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