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University of Arizona (2001)

Effects of fire on Agave palmeri

Johnson, Roxane Jeannette

Titre : Effects of fire on Agave palmeri

Auteur : Johnson, Roxane Jeannette

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 2001

Résumé
I investigated the effects of prescribed fire on Agave palmeri , an important seasonal food source of the federally Endangered bat, Leptonycteris curasoae yerbabuenae. Three different treatments were randomly assigned to plots containing agaves within a burn unit : plots were burned with extant fuel, plots were left unburned, and plots were burned with an augmentation of fuel. Agaves were surveyed before the fires, immediately after the fires, and one and two years after the fires. Mortality and survivorship with the fuel load, agave size and the type of clusters in which the agaves grew. Agaves near mesquite and acacia trees or dead, dried agaves experienced higher mortality than agaves growing elsewhere. Agaves in plots with added fine fuels also had higher rates of mortality. One year post-fire, mortality was low in all treatments and recruitment was higher on augmented and burned plots than on unburned plots. Two years post-fire, mortality of small Agave palmeri was associated more strongly with rainfall than with fire treatment, while mortality of larger height classes of agaves exhibited a delayed response to fires.

Mots clés : Biology, Ecology. ; Agriculture, Range Management.

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Page publiée le 23 décembre 2016, mise à jour le 9 septembre 2018