Drought and phytophthora are associated with the decline of oak species in Southern Italy
Data de publicació2018
Camarero, J. Julio
Redondo, Miguel Ángel
MetadadesMostra el registre d'unitat complet
Forest decline induced by climate change is a global phenomenon that affects many tree species, mainly in drought-prone areas as the Mediterranean region. In southern Italy, several oak species have shown decline symptoms and elevated mortality since the 2000s due to drought stress. However, it remains
to be answered whether decline occurred alone or whether a pathogen was also involved. To this aim, we compared two coexisting oak species in a forest located in southern Italy which are assumed to be less (Quercus cerris) and more tolerant to drought (Quercus pubescens). We sampled fifteen couples of neighboring declining (D) and non-declining (ND) trees of both species. Wood cores were taken from all trees to perform dendrochronological analyses to detect the decline onset and link it to potential climatic drivers. Carbon isotope ratios (d13C) were analyzed in wood of the two vigor classes to compare their water-use efficiency. Phytophthora presence was also assessed in soil samples from ten D-ND couples of trees per species. The oak species most affected by drought-induced decline in terms of leaf shedding and mortality was Q. cerris, i.e., the least tolerant to drought. In both species, the D trees showed a reduced growth rate compared with ND trees from 2000 onward when drought and warming intensified. Q. pubescens showed higher growth sensitivity to precipitation, temperature and drought than Q. cerris. This sensitivity to climate was magnified in D trees whose growth decreased in response to warm and dry conditions during the prior winter and the late summer. The Q. pubescens D trees were more efficient in their water use than ND trees before the growth divergence between D and ND trees amplified. In the studied area, Phytophthora quercina was isolated from 40% of the sampled trees, and tended to be more frequent amongst ND than amongst D trees. Our data suggests that droughts and warm summer conditions triggered oak decline. The high prevalence of P. quercina in the studied area warrants further study as a potential predisposing factor.
És part deFrontiers in Plant Science, vol. 9, article 1595, p. 1-13
Projectes de recerca europeus
Els fitxers de llicència següents estan associats amb aquest element:
Mostrant elements relacionats per títol, autor i matèria.
Drought decreases growth and increases mortality of coexisting native and introduced tree species in a temperate floodplain forest Colangelo, Michele; Camarero, J. Julio; Ripullone, Francesco; Gazol, Antonio; Sánchez-Salguero, Raúl; Oliva Palau, Jonàs; Redondo, Miguel Ángel (MDPI, 2018)Forest dieback and mortality events induced by drought stress are widely reported. However, few studies have jointly examined the role played by drought on growth and mortality in tree species inhabiting floodplain ...
Growth, wood anatomy and stable isotopes show species-specific couplings in three Mexican conifers inhabiting drought-prone areas Pacheco, Arturo; Camarero Martínez, Jesús Julio; Pompa-García, Marín; Battipaglia, Giovanna; Voltas Velasco, Jordi; Carrer, Marco (Elsevier, 2019-08-22)An improved understanding of how tree species will respond to warmer conditions and longer droughts requires comparing their responses across different environmental settings and considering a multi-proxy approach. We used ...
Contrasting distribution patterns between aquatic and terrestrial Phytophthora species along a climatic gradient are linked to functional traits Redondo, Miguel Ángel; Boberg, Johanna; Stenlid, Jan; Oliva Palau, Jonàs (Springer Nature, 2018)Diversity of microbial organisms is linked to global climatic gradients. The genus Phytophthora includes both aquatic and terrestrial plant pathogenic species that display a large variation of functional traits. The extent ...