TNC Global Invasive Species Team page


	The Global Invasive Species Team

Introduction

First slide
Slide #5
Slide #10
Slide #15
Slide #20
Slide #25
Slide #30
Slide #35
Slide #40
Slide #45
Slide #50
Slide #55
Slide #60
Slide #65
Slide #70
Last slide

IMPACTS

Ecosystem Level Impacts

Disturbance regimes (i.e. fires)
Hydrology
Geomorphological processes (i.e. erosion, sedimentation)
Soil chemistry (i.e. nutrients)

Community and Population Level Impacts

Vegetation structure
Community composition
Resource competition
Negative impacts on native animals
Promotion of non-native invasive animals
Population reductions, eliminations
Reduced recruitment of natives (succession)
Hybridization with native species

Positive Impacts
Lack of Impacts

Invasive plants can have a variety of harmful impacts on native species populations, communities and ecosystems. I find the classification scheme used here helpful. Examples of alien invasive plants known or suspected of causing many of these impacts will be described using the following images. Some invasive plants may provide benefits (such as cover or forage) to some native species in some situations (for example, Shapiro, 2002). However, the focus of this talk is on what we know about the negative impacts of invasive species.

Slide 17

IMPACTS

Ecosystem Level Impacts

Community and Population Level Impacts

Positive Impacts Lack of Impacts

Center for Invasive Species and Ecosystem Health

Positive Impacts
Lack of Impacts