Holocene environmental and climatic changes at Gorgo Basso,a coastal lake in southern Sicily,Italy |
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| Authors: | Willy Tinner Jacqueline FN van Leeuwen Daniele Colombaroli Elisa Vescovi WO van der Knaap Paul D Henne Salvatore Pasta Stefania D'Angelo Tommaso La Mantia |
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| Institution: | 1. Instituto Pirenaico de Ecología-CSIC, Avda. Montañana 1005, 50059 Zaragoza, Spain;2. Dipartimento di Biologia Ambientale, Sapienza Università di Roma, Piazzale Aldo Moro, 5, 00185 Rome, Italy;3. Departamento de Estratigrafía y Paleontología, Universidad del País Vasco-Euskal Herriko Unibertsitatea, B. Sarriena s/n, Ap. 644, 48080 Bilbao, Spain;4. Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain;5. Departamento de Ciencias de la Antigüedad, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain;1. Departament de Prehistòria, Universitat Autònoma de Barcelona, Edifici B Facultat de Filosofia i Lletres, 08193, Bellaterra, Barcelona, Spain;2. Laboratorio de Evolución Humana, Departamento Ciencias Históricas y Geografía, Universidad de Burgos, Plaza Misael Bañuelos, Edificio I+D+i, 09001 Burgos, Spain;3. Institut Català de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Spain;4. Institut Català de Paleoecologia Humana i Evolució Social (IPHES), Zona Educacional 4 - Campus Sescelades URV (Edifici W3), 43007 Tarragona, Spain;5. Universitat Rovira i Virgili, Carrer de l''Escorxador, s/n, 43003 Tarragona, Spain;6. Department of Paleoecology and Landscape Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands;7. GI Arqueobiología, Instituto de Historia, Centro de Ciencias Humanas y Sociales - Consejo Superior de Investigaciones Científicas (CCHS-CSIC), C/Albasanz 26–28, 28037 Madrid, Spain;8. Escuela Española de Historia y Arqueología en Roma, Consejo Superior de Investigaciones Científicas (CSIC), Via Sant''Eufemia 13, 00187 Rome, Italy;9. Archaeology of Social Dynamics, Institución Milà y Fontanals, Consejo Superior de Investigaciones Científicas (IMF-CSIC), C/Egipcíaques, 15, 08001 Barcelona, Spain;1. Department of Environmental Biology, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Roma, Italy;2. Istituto per l''Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Interno Porto di Napoli, 80133 Napoli, Italy |
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| Abstract: | We used a new sedimentary record to reconstruct the Holocene vegetation and fire history of Gorgo Basso, a coastal lake in south-western Sicily (Italy). Pollen and charcoal data suggest a fire-prone open grassland near the site until ca 10,000 cal yr BP (8050 cal BC), when Pistacia shrubland expanded and fire activity declined, probably in response to increased moisture availability. Evergreen Olea europaea woods expanded ca 8400 to decline abruptly at 8200 cal yr BP, when climatic conditions became drier at other sites in the Mediterranean region. Around 7000 cal yr BP evergreen broadleaved forests (Quercus ilex, Quercus suber and O. europaea) expanded at the cost of open communities. The expansion of evergreen broadleaved forests was associated with a decline of fire and of local Neolithic (Ficus carica–Cerealia based) agriculture that had initiated ca 500 years earlier. Vegetational, fire and land-use changes ca 7000 cal yr BP were probably caused by increased precipitation that resulted from (insolation-forced) weakening of the monsoon and Hadley circulation ca 8000–6000 cal yr BP. Low fire activity and dense coastal evergreen forests persisted until renewed human activity (probably Greek, respectively Roman colonists) disrupted the forest ca 2700 cal yr BP (750 BC) and 2100 cal yr BP (150 BC) to gain open land for agriculture. The intense use of fire for this purpose induced the expansion of open maquis, garrigue, and grassland-prairie environments (with an increasing abundance of the native palm Chamaerops humilis). Prehistoric land-use phases after the Bronze Age seem synchronous with those at other sites in southern and central Europe, possibly as a result of climatic forcing. Considering the response of vegetation to Holocene climatic variability as well as human impact we conclude that under (semi-)natural conditions evergreen broadleaved Q. ilex–O. europaea (s.l.) forests would still dominate near Gorgo Basso. However, forecasted climate change and aridification may lead to a situation similar to that before 7000 cal yr BP and thus trigger a rapid collapse of the few relict evergreen broadleaved woodlands in coastal Sicily and elsewhere in the southern Mediterranean region. |
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