Juan Manuel Mancilla-Leytón

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Seed predation has traditionally been considered as simply a progressive loss of seeds. However, partial consumption of tree seeds may actually assist regeneration. We quantified partial consumption of acorns by the common rabbit (Oryctolagus cuniculus) in a cork oak forest in southwest Spain (Doñana Natural Park). To examine the effects of partial(More)
We examined the importance of partial seed consumption (cotyledon loss) by rabbits in the early establishment of seedlings of cork oaks restricted to nutrient-impoverished soils. To determine the importance of cotyledons in the growth and development of seedlings, we simulated two levels of predation [light (30 % cotyledon loss) and heavy (60 % loss)(More)
“Dehesas” are savanna-like ecosystems of human origin that extend broadly in the Mediterranean area of the Iberian Peninsula. They consist of scattered oaks (mainly Quercus ilex subsp. ballota L. holm-oak), an annual grassland layer and interspersed shrubs. These ecosystems, used for grazing and wild game, support high plant and animal biodiversity and(More)
The aim of this study was to determine whether goat grazing in the understory of a pine forest at Doñana Natural Park could accelerate the decomposition of the pine needles accumulated on the soil surface and, if so, through which mechanisms. Specifically, the roles of trampling (mechanical fragmentation) and nutrient enrichment through defecation(More)
The aim of this study was to assess how the physical (needle fragmentation by trampling) and chemical (nutritional enrichment from faeces) changes brought about by grazing influence the consumption of needles of Pinus pinea L. by Ommatoiulus sabulosus L. Adult individuals of O. sabulosus were introduced into trays with pine needles subjected to four(More)
We examined the effect of abiotic characteristics (soil compaction, water availability and photosynthetic photon flux density (PPF) on the germination, emergence, growth and survival of Quercus ilex subsp. ballota seedlings. To determine the importance of these characteristics on the growth and development of the seedlings, we simulated two levels of water(More)
We have studied the effect of goat grazing on the shrub understory of a pine forest situated in a protected area (Doñana Natural Park). Along three years we have studied the changes in phytovolume, flammability, species richness and diversity in a grazed shrubland and in a control area not grazed by the goats. We studied also food preferences of the goats(More)
Glaucium flavum is an endangered coastal herb capable of growth in a wide variety of ecosystems. We explore plant-soil relationships in this species by evaluating plant performance and soil physicochemical properties in the different types of ecosystems where it grows. Ten natural populations from southern Spain were chosen for the study. In each(More)
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