Resumen de Reproducción sexual y multiplicación vegetativa en Arisarum simorrhinum Durieu (Araceae)
- español
Se estudian características reproductivas y vegetativas de Ar. isarum simorrhinum Durieu en el sur de España, tales como su fenología de floración y foliación, características de la inflorescencia, etc. El balance entre reproducción sexual y multiplicación vegetativa en A. simorrhinum parece ser favorable a la segunda, ya que son pocas las plantas que florecen, hay escasa producción de semillas y las inflorescencias carecen de atributos esenciales para el buen funciónamiento de las «flores trampa», tales como el olor intenso y la protoginia. Comparamos esta estrategia reproductiva con la de otras Araceae de la región (Biarum spp.) con hábitats muy distintos a los de Arisarum.
- English
Reproductive and vegetative characteristics of Arisarum simorrhinum Durieu (Araceae), a geophyte living in the understory of forests in the Mediterranean region, are studied, in southwestern Spain. A. simorrhinum produces leaves and monoecious inflorescences of the trap type (lasting about one month) during the winter. Fruits complete their development in spring and, by the summer, the plants start a dormant phase which extends until the arrival of autumn rains. Inflorescences produce a faint odour which attracts a variety of small dipterans, mainly in the families Mycetophilidae (Fungus Gnats) and Drosophilidae. Bagged inflorescences produced no fruits. Plants in the studied population don't exhibite functional protogyny and present extensive clonal growth. The number of tubers performing sexual reproduction is small relative to non reproducing, vegetatively spreading ones. Abortion of developing fruits is very common. It is suggested that seed production is not a major factor in the survival of the populations of A. simorrhinum, which rely on extensive clonal growth for maintenance. This life strategy is compared to that of a related genus -Biarum- whose species live in open, drier habitats.
