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University of Arizona (2020)

ECOLOGICAL DISTURBANCE OF THE ENDANGERED PLANT TAXON OF ARIZONA : THREATS, BENEFITS, AND MANAGEMENT

DuBroy, Alexandre

Titre : ECOLOGICAL DISTURBANCE OF THE ENDANGERED PLANT TAXON OF ARIZONA : THREATS, BENEFITS, AND MANAGEMENT

Auteur : DuBroy, Alexandre

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 2020

Résumé
Fourteen endangered plant taxa are believed to exist in Arizona. They face numerous threats in the form of ecological disturbances, which can push species closer to extinction. This thesis examines how seven categories of disturbance, namely fire, grazing, flooding, pests, human action, habitat loss, and climate change affect the endangered plant taxon of Arizona. This thesis hypothesizes that e cological disturbance is not all bad, and may in fact benefit endangered species. Existing research is compiled, and conservation and management advice are given based on the threats that these taxa are facing. This thesis concludes that human action and climate change are the greatest threats that taxon are facing, and that climate change will worsen the effects of the other disturbances. Results show that of the 98 effects logged, only five were positive, and 58 were negative to the taxon. This leads the author to reject their hypothesis, though with the caveat that lack of data hampers the accuracy of this conclusion. Much research is lacking and urgently needed, especially around the effects of climate change. The synergistic effects of disturbances are suggested by the research, in that the combination of multiple threats leads species towards extinction. These synergistic effects are a key area of future research.

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Page publiée le 2 décembre 2021