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International audienceTo date, Holocene palaeoecological signatures on the Northwestern coast of France have not been thoroughly investigated. Inthis study, environmentalchanges related to both climate processes and human disturbances were reconstructed over the last 7000cal. yr BP, based on pollen and chironomidassemblages from four coastal cores retrieved in Western Brittany (Porsmilin beach, NW France). Pollen and chironomid recordsshow an environmentalresponse to both millennial- and centennial-scale climate changes. During the mid-Holocene (until around 4200cal. yr BP), when human impact was low,Porsmilin’s landscape was characterized by a mixed oak forest dominated byCorylustrees. Comparison of our data with other palynological data fromthe NW French Atlantic coast shows that this dominance may be related to more humid conditions prevailing at Porsmilin.Furthermore, over the mid-Holocene,CorylusandQuercuspatterns appear anti-correlated, withQuercusdeclines appearing synchronous with major storms revealed by data recentlycompiled for the Holocene in Brittany, suggesting that cold conditions probably caused theQuercuscontractions, which in turn favoured the rise of theheliophile taxonCorylus. Regarding chironomids over this period, our results show variations in lotic–lentic taxa related to hydrological conditions, morespecifically changes in river run off strength. Over the Late Holocene, the Porsmilin palynological record shows progressivevegetation changes mainlyrelated to human settlement and development of agricultural activities

Coastal palaeoenvironmental record of the last 7 kyr BP in NW France: Sub-millennial climatic and anthropic Holocene signals