Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Etats Unis → 2012 → From drought to deluge : responses of native and exotic Southern California plant species to experimental variation in rainfall

University of California San Diego (2012)

From drought to deluge : responses of native and exotic Southern California plant species to experimental variation in rainfall

Ashbacher, Angelita Consuelo de Dios

Titre : From drought to deluge : responses of native and exotic Southern California plant species to experimental variation in rainfall

Auteur : Ashbacher, Angelita Consuelo de Dios

Université de soutenance : University of California San Diego

Grade : Master of Sciences (MS) 2012

Résumé
Climate models for Southern California predict long periods of drought punctuated by periods of high precipitation due to a higher incidence of extreme weather events resulting from climate change. Synergies between changing rainfall patterns, invasion and large-scale disturbances such as fire could influence community structure in the shrub lands of Southern California. Juvenile shrubs have shallow roots and rely on water inputs from rainfall. Sharing the rooting zone with exotic species, they are subject to competition for resources. The environmental conditions present during an establishment phase in this system will dictate the course of succession and ultimately, community composition. We experimentally manipulated rainfall in an invaded chaparral community recovering from fire. This study sought to predict differences in growth responses between established and juvenile shrubs as well as exotic herbaceous species and juvenile shrubs on the basis of functional traits. Our results suggest that exotic species have disproportionate growth responses to changing rainfall in comparison to native species. This outcome however, could not be explained on the basis of mean functional trait values or trait plasticity. The superior performance of exotic species in response to increased rainfall due to climate change calls attention to the importance of active management of exotic species in this system, especially during periods with multiple high rainfall years in a row. This is of particular importance during restoration of native habitats and during periods of establishment following large scale disturbances

Présentation (eScholarship)

Version intégrale

Page publiée le 29 janvier 2016, mise à jour le 12 juillet 2018