Fire regime changes are considered a major threat to future biodiversity in the Mediterranean Basin. Such predictions remain uncertain, given that fire regime changes and their ecological impacts occur over timescales that are too long for direct observation. Here we analyse centennial- and millennial-scale shifts in fire regimes and compositional turnover to track the consequences of fire regime shifts on Mediterranean vegetation diversity. We estimated rate-of-change, richness and compositional turnover (beta diversity) in 13 selected high-resolution palaeoecological records from Mediterranean Iberia and compared these with charcoal-inferred fire regime changes. Event sequence analysis showed fire regime shifts to be significantly temporally associated with compositional turnover, particularly during the last three millennia. We find that the timing and direction of fire and diversity change in Mediterranean Iberia are best explained by long-term human–environment interactions dating back perhaps 7500 years. Evidence suggests that Neolithic burning propagated a first wave of increasing vegetation openness and promoted woodland diversity around early farming settlements. Landscape transformation intensified around 5500 to 5000 cal. yr BP and accelerated during the last two millennia, as fire led to permanent transitions in ecosystem state. These fire episodes increased open vegetation diversity, decreased woodland diversity and significantly altered richness on a regional scale. Our study suggests that anthropogenic fires played a primary role in diversity changes in Mediterranean Iberia. Their millennia-long legacy in today’s vegetation should be considered for biodiversity conservation and landscape management.

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Humans take control of fire-driven diversity changes in Mediterranean Iberia’s vegetation during the mid–late Holocene:

Digging sticks and agriculture development at the ancient Neolithic site of la Draga (Banyoles, Spain)

Identification of woodland management by analysis of roundwood age and diameter: Neolithic case studies

Tool mark analysis of Neolithic wooden digging sticks from La Draga (Banyoles, Spain)

Human evolution was strongly related to environmental factors. Woodlands and their products played a key role in the production of tools and weapons, and provided unique resources for constructions and fuel. Therefore wooden finds are essential in gaining insights into climatic and land use changes but also societal development during the Holocene. Dendroarchaeological investigations, based on tree rings, wood anatomy and techno-morphological characteristics are of great importance for a better understanding of past chronological processes as well as human-environment-interactions. Here we present an overview of the sources, methods, and concepts of this interdisciplinary field of dendroarchaeology focusing on Europe, where several tree-ring chronologies span most of the Holocene. We describe research examples from different periods of human history and discuss the current state of field. The long settlement history in Europe provides a myriad of wooden archeological samples not only for dating but also offer exciting new findings at the interface of natural and social sciences and the humanities.

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Dendroarchaeology in Europe

Wood is one of the most common raw materials for the prehistoric societies. Therefore sites were wood is preserved in waterlogged conditions are essential in order to understand those prehistoric s...

Wood Procurement at the Early Neolithic site of La Draga (Banyoles, Barcelona)

This article shows a set of agroecological practices that were incorporated into the archeological landscape of the Chanchán basin by pre-Hispanic Kañaris societies for 1200 years (240–1438 AD), a millennium before the arrival of the Incas, and that continue to be used in this landscape by certain indigenous communities of the 21st century. The use of archeobotanical techniques, contrasted with ethnobotanical sources, has allowed us to interpret how these societies structured their cultivation systems, agroecological practices, and landscape management, for the conservation of agroecosystems in the western Andean foothills. Agroecological legacies show how the stability, adaptability, and elasticity of Andean agriculture can be sustained under models of progressive intensification without this causing irreversible environmental damage in the agroecosystems. Kañaris agroecological practices configured the Chanchán landscape as a great cultural artifact, wherein the non-human agency of plants (cultivated and wild) was more than a mere adaptation to the niches culturally constructed by human populations. Non-humans are active subjects in recovering the functional and structural integrity of agroecosystems after a social or ecological disturbance. All this is part of landscape management based on an “Ecological Diversification Model”, where plant species are adapted to the ecotones and ecological floors of the western Andean foothills, to diversify and increase the availability of food crops that are bioculturally appropriate given the present agrobiodiversity.

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The Archeological Landscape of the Chanchán Basin and Its Agroecological Legacies for the Conservation of Montane Forests in the Western Foothills of the Ecuadorian Andes

Raquel Piqué Huerta

Papers

Wood Procurement at the Early Neolithic site of La Draga (Banyoles, Barcelona)

The Archeological Landscape of the Chanchán Basin and Its Agroecological Legacies for the Conservation of Montane Forests in the Western Foothills of the Ecuadorian Andes

Describing the neolithic cord production process: Raw materials, techniques and experimental archaeology in La Draga (Girona, Spain; 5207–4862 cal BC)