Thomas Smith

Date of Award

2021

Document Type

Thesis

Degree Name

Bachelors

Department

Natural Sciences

First Advisor

Oberle, Brad

Area of Concentration

Environmental Studies

Abstract

Some plant species release organic chemical compounds (allelochemicals) in order to hinder the growth of other organisms. This adaptation is known as allelopathy and is relatively widespread among both native and invasive species. Brazilian Pepper, Schinus terebinthifolia, Anacardiaceae (BP) a notoriously damaging invasive plant in Florida, exhibits allelopathy on multiple fronts; the compounds in the leaves, roots, stems and seeds suppress germination and growth in native plant species. The allelopathic effects of Brazilian Pepper (BP) against native species have been well documented, but there is a dearth of research concerning how other invasive plant species in Florida react to BP allelopathy. In a lab germination experiment, BP allelochemicals found in leaves and topsoil were shown to decrease growth, suppress germination, and increase mortality in both native (Pinus elliottii) and invasive species (Schinus terebinthifolia & Casuarina equisetifolia) to differing degrees. It will be difficult to stabilize native ecosystems and remove noxious weeds if land managers are unaware of the biological and developmental reactions of native and non-native flora to BP allelochemicals. Accordingly, park managers may be able to recognize potential invasive threats more effectively and respond appropriately if provided with more data concerning the range and severity of potential allelopathic effects.

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