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Human Colonization of new lands implied historically the diffusion of new plant species and the exploitation of local plant resources and forests by human communities. Phoenician colonization in the 1st millennium BC had important consequences in Mediterranean agriculture and the exploitation of vegetation in colonized areas. Later, Roman agriculture introduced new changes. The anthracological analysis or charcoal analysis of the archaeological record of the site of Utica can inform us about the long term transformations in vegetation in North Africa. The original vegetation, consisting mainly of Pistacia lentiscus, would see its population reduced due to the implantation of non-intensive olive production in Phoenician and Punic periods. Nevertheless, since the Roman Imperial Period there was a strong decline of natural vegetation, in correlation of the important increment of olive trees, which indicate the presence of intensive oil production, mainly to be exported to Rome. Furthermore, the appearance of walnut trees presents novel data regarding the expansion of arboriculture throughout the Mediterranean in hand with the Phoenicians during the 1st millennium BC. The anthracological analysis of Utica presents important information regarding the natural vegetation that existed when the Phoenicians arrived, and the transformation that happened throughout time, corresponding to the management of the surrounding landscape during the Phoenician, Punic, and Roman periods. [ABSTRACT FROM AUTHOR]