Person: Delgado Sáez, Juan Antonio
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First Name
Juan Antonio
Last Name
Delgado Sáez
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Biológicas
Department
Biodiversidad, Ecología y Evolución
Area
Ecología
Identifiers
3 results
Search Results
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Item Erratum to: Field patterns of temporal variations in the light environment within the crowns of a Mediterranean evergreen tree (Olea europaea)(Trees, 2016) Ventre-Lespiaucq, Agustina B.; Escribano Rocafort, Adrián Gaspar; Delgado Sáez, Juan Antonio; Jiménez Escobar, María Dolores; Rubio de Casas, Rafael; Granado Yela, Carlos; Balaguer Núñez, LuisItem Estimating wind dispersal potential in Ailanthus altissima: The need to consider the three-dimensional structure of samaras(Plant Biosystems, 2016) Planchuelo, Greg; Catalán, Pablo; Delgado Sáez, Juan Antonio; Murciano Cespedosa, AntonioPlant dispersal is a very important ecological phenomenon, as it can enable species to move away from the parent plant. This contributes to shaping communities, determining patterns of distribution, landscape configuration, plant invasions and evolutionary processes. Measuring dispersal distance directly is difficult and thus, diaspore morphology can be used to make estimates. Previous research on the topic often resorts to analysing the diaspore’s morphology as if it was a bi-dimensional structure; when in many cases, diaspores have three-dimensional qualities. In this study, we show how estimates of wind dispersal potential of Ailanthus altissima can be considerably improved using morphological variables that succeed in describing the three-dimensional nature of samaras. We suggest that this reasoning could be extensively applied to research involving not only other species, but also multi-specific scenarios with a wide range of diaspore morphologies.Item Field patterns of temporal variations in the light environment within the crowns of a Mediterranean evergreen tree (Olea europaea)(Trees, 2016) Ventre-Lespiaucq, Agustina B.; Escribano Rocafort, Adrián Gaspar; Delgado Sáez, Juan Antonio; Jiménez Escobar, María Dolores; Rubio de Casas, Rafael; Granado Yela, Carlos; Balaguer Núñez, LuisThe light environment within a tree crown can be characterized by specific variation patterns arising from the structural features of the crown. Within-crown light variation patterns can be important for plant productivity, but this has yet to be assessed in natural settings. The spatio-temporal variations of direct and diffuse photosynthetic photon flux density (PPFD), their proportions and sunfleck frequency within the crowns of isolated adult wild olive trees (Olea europaea L.) were investigated. Trees growing in contrasting Mediterranean conditions (continental vs. coastal) at the same latitude were compared. Instantaneous diffuse and total PPFD were measured with sunshine sensors in three crown layers (outer-, middle- and inner-crown) in the south-facing part of the crown, at two points of the diurnal (mid-morning and midday) and seasonal (summer and winter) cycles. Direct PPFD and the proportion of direct to total PPFD vary diurnally within the crown as a result of an increase in sunfleck requency during midday and in self-shading during mid-morning, in both summer and winter conditions. Conversely, the lack of seasonal variation in the three light attributes is better explained by a greater average crown transmittance in winter conditions. The interplay between crown architecture heterogeneity and varying solar position renders identifiable patterns of temporal variations in the light environment within tree crowns. These patterns suggest that trees can benefit from the light heterogeneity typical of Mediterranean environments by developing conservative architectural layouts.