Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Facilitation effects on biodiversity depends on grazing and climate in a mountain Ecuadorian dry scrub ecosystem.
Año:2011
Áreas de investigación
  • Ecología
Datos
Descripción
To unveil mechanisms driving species composition and maintenance of species diversity in plant communities has remained central to ecology during the last decades. Among them, biotic interactions and more specifically, the existence of positive ones, have strong, often species-specific, effects on plant diversity. These positive interactions would expand species distribution across environmental gradients and increase the extent of suitable habitats into physically harsh. Our working hypothesis is based on two complementary ideas: i) nurses increase the diversity because many species recruit successfully only beneath their canopies but the importance of this facilitation decreases in areas with lower abiotic stress, ii) this primary effect is modulated by the herbivory pressure which can force some plants to survive only under nurse canopies. Our results support the proposal that magnitude of the effects of ecosystem engineers in species diversity and productivity vary along environmental gradients, in zones with higher environmental stress the engineering plants effect is higher. Moreover, our results show that inclusion of grazing pressure as a driver of plant?plant interactions alters the importance of positive ? negative interactions, in the presence of herbivores, the importance of the engineering plants is maintained in zones with benign environmental. Biotic interactions change with the elevation from positive relationships in the lower zone to neutral or negative in the higher zones, responding to the stress hypothesis of the gradient, these effects are evaluated both the cover and species richness. However, the inclusion of grazing has a substantial impact on the interactions changing the patterns interaction.
Internacional
Si
Nombre congreso
12th European Ecological Federation Congress
Tipo de participación
960
Lugar del congreso
Avila
Revisores
Si
ISBN o ISSN
NA
DOI
Fecha inicio congreso
25/09/2011
Fecha fin congreso
29/09/2011
Desde la página
95
Hasta la página
95
Título de las actas
12th European Ecological Federation Congress. Abstract Book
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Carlos Iván Espinosa (Universidad Técnica Particular de Loja)
  • Autor: Marcelino de la Cruz Rot (UPM)
  • Autor: Adrián Escudero (Universidad Rey Juan Carlos)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Biodiversidad y conservación de recursos fitogenéticos
  • Departamento: Biología Vegetal
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