56072 20200221144249.0 doi 10.3389/fpls.2016.00579 sideral 95054 ART-2016-95054 eng Zalloni, E. Climatic signals from intra-annual density fluctuation frequency in mediterranean pines at a regional scale 2016 Access copy available to the general public Unrestricted Tree rings provide information about the climatic conditions during the growing season by recording them in different anatomical features, such as intra-annual density fluctuations (IADFs). IADFs are intra-annual changes of wood density appearing as latewood-like cells within earlywood, or earlywood-like cells within latewood. The occurrence of IADFs is dependent on the age and size of the tree, and it is triggered by climatic drivers. The variations of IADF frequency of different species and their dependence on climate across a wide geographical range have still to be explored. The objective of this study is to investigate the effect of age, tree-ring width and climate on IADF formation and frequency at a regional scale across the Mediterranean Basin in Pinus halepensis Mill., Pinus pinaster Ait., and Pinus pinea L. The analyzed tree-ring network was composed of P. pinea trees growing at 10 sites (2 in Italy, 4 in Spain, and 4 in Portugal), P. pinaster from 19 sites (2 in Italy, 13 in Spain, and 4 in Portugal), and P. halepensis from 38 sites in Spain. The correlations between IADF frequency and monthly minimum, mean and maximum temperatures, as well as between IADF frequency and total precipitation, were analyzed. A significant negative relationship between IADF frequency and tree-ring age was found for the three Mediterranean pines. Moreover, IADFs were more frequent in wider rings than in narrower ones, although the widest rings showed a reduced IADF frequency. Wet conditions during late summer/early autumn triggered the formation of IADFs in the three species. Our results suggest the existence of a common climatic driver for the formation of IADFs in Mediterranean pines, highlighting the potential use of IADF frequency as a proxy for climate reconstructions with geographical resolution. info:eu-repo/grantAgreement/EUR/COST/STREeSS-FP1106 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 4.298 2016 PLANT SCIENCES 20 / 211 = 0.095 2016 Q1 T1 1.973 2016 Plant Science 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-7585-3636 de Luis, M. Universidad de Zaragoza Campelo, F. (orcid)0000-0003-0993-5286 Novak, K. De Micco, V. Di Filippo, A. Vieira, J. Nabais, C. Rozas, V. Battipaglia, G. 3006 430 Universidad de Zaragoza Dpto. Geograf. Ordenac.Territ. Área Geografía Física 7 (2016), 579 [11 pp] Front. plant sci. FRONTIERS IN PLANT SCIENCE 1664-462X 1381305 http://zaguan.unizar.es/record/56072/files/texto_completo.pdf Versión publicada 97960 http://zaguan.unizar.es/record/56072/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:56072 articulos driver 2020-02-21-13:27:02 ARTICLE