Climate change facilitated the early colonization of the Azores Archipelago during medieval times
Authors
Pedro M. Raposeiro
Armand Hernández
Sergi Pla-Rabes
Vítor Gonçalves
Roberto Bao
Alberto Sáez
Timothy Shanahan
Mario Benavente
Erik J. de Boer
Nora Richter
Verónica Gordon
Helena Marques
Pedro M. Sousa
Martín Souto
Miguel G. Matias
Nicole Aguiar
Cátia Pereira
Catarina Ritter
María Jesús Rubio
Marina Salcedo
David Vázquez-Loureiro
Olga Margalef
Linda A. Amaral-Zettler
Ana Cristina Costa
Yongsong Huang
Jacqueline F. N. van Leeuwen
Pere Masque, Edith Cowan UniversityFollow
Ricardo Prego
Ana C. Ruiz-Fernández
Joan-Albert Sanchez-Cabeza
Ricardo Trigo
Santiago Giralt
Document Type
Conference Proceeding
Publication Title
Proceedings of the National Academy of Sciences of the United States of America
Volume
118
Issue
41
PubMed ID
34607952
Publisher
the US National Academy of Sciences
School
School of Science / Centre for Marine Ecosystems Research
RAS ID
42653
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 likely inhibited 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.
DOI
10.1073/pnas.2108236118
Access Rights
free_to_read
Comments
Raposeiro, P. M., Hernández, A., Pla-Rabes, S., Gonçalves, V., Bao, R., Sáez, A., . . . Giralt, S. (2021). Climate change facilitated the early colonization of the Azores Archipelago during medieval times. In Proceedings of the National Academy of Sciences, 118(41), article e2108236118. US National Academy of Sciences. https://doi.org/10.1073/pnas.2108236118