Phenotypic integration and life history strategies among populations of Pinus halepensis: an insight through structural equation modelling
MetadataShow full item record
Background and Aims: Understanding inter-population variation in the allocation of resources to specific anatomical compartments and physiological processes is crucial to disentangle adaptive patterns in forest species. This work aims to evaluate phenotypic integration and trade-offs among functional traits as determinants of life history strategies in populations of a circum-Mediterranean pine that dwells in environments where water and other resources are in limited supply. Methods: Adult individuals of 51 populations of Pinus halepensis grown in a common garden were characterized for 11 phenotypic traits, including direct and indirect measures of water uptake at different depths, leaf area, stomatal conductance, chlorophyll content, non-structural carbohydrates, stem diameter and tree height, age at first reproduction and cone production. The population differentiation in these traits was tested through analysis of variance (ANOVA). The resulting populations' means were carried forward to a structural equation model evaluating phenotypic integration between six latent variables (summer water uptake depth, summer transpiration, spring photosynthetic capacity, growth, reserve accumulation and reproduction). Key Results: Water uptake depth and transpiration covaried negatively among populations, as the likely result of a common selective pressure for drought resistance, while spring photosynthetic capacity was lower in populations originating from dry areas. Transpiration positively influenced growth, while growth was negatively related to reproduction and reserves among populations. Water uptake depth negatively influenced reproduction. Conclusions: The observed patterns indicate a differentiation in life cycle features between fast-growing and slow-growing populations, with the latter investing significantly more in reproduction and reserves. We speculate that such contrasting strategies result from different arrays of life history traits underlying the very different ecological conditions that the Aleppo pine must face across its distribution range. These comprise, principally, drought as the main stressor and fire as the main ecological disturbance of the Mediterranean basin.
Is part ofAnnals of Botany, 2019, vol. 124, num. 7, p. 1161-1171
European research projects
Showing items related by title, author, creator and subject.
Using unmanned aerial vehicle‐based multispectral, RGB and thermal imagery for phenotyping of forest genetic trials: A case study in Pinus halepensis Santini, Filippo; Kefauver, Shawn C.; Resco de Dios, Víctor; Araus Ortega, José Luis; Voltas Velasco, Jordi (Association of Applied Biologists, 2019-02-19)The assessment of genetic differentiation in functional traits is fundamental towards understanding the adaptive characteristics of forest species. While traditional phenotyping techniques are costly and time‐consuming, ...
Scarce population genetic differentiation but substantial spatiotemporal phenotypic variation of water‑use efficiency in Pinus sylvestris at its western distribution range Santini, Filippo; Ferrio Díaz, Juan Pedro; Hereş, A. M.; Notivol, Eduardo; Piqué i Nicolau, Míriam; Serrano Endolz, Luis; Shestakova, Tatiana A.; Sin Casas, Esther; Vericat, P.; Voltas Velasco, Jordi (Springer, 2018-10-23)Water and carbon fluxes in forests are largely related to leaf gas exchange physiology varying across spatiotemporal scales and modulated by plant responses to environmental cues. We quantified the relevance of genetic and ...
Dendroecological and genetic insights for future management of an old-planted forest of the endangered Mediterranean fir Abies pinsapo Santini, Filippo; Shestakova, Tatiana A.; Dashevskaya, Svetlana; Notivol, Eduardo; Voltas Velasco, Jordi (Elsevier, 2020-09-03)Pinsapo fir (Abies pinsapo Boiss.) is an endangered Mediterranean conifer that has raised strong conservation interest as a paradigmatic example of species characterized by small and fragmented populations. We studied an ...