What are the combined effects of global climate change and biological invasions on insect community structure?

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Presentation transcript:

What are the combined effects of global climate change and biological invasions on insect community structure?

Components of global change Habitat loss Elevated CO 2 Climate change Invasive species

Insects InvasionsElevated CO 2

Insects InvasionsElevated CO 2

What are the combined effects of elevated CO 2 & plant invasions on insect community structure?

Elevated [CO2] (n=2)Ambient [CO2] (n=3) Insect richness t=-9.91, df=3, p=0.002

Elevated [CO2]Ambient [CO2] Insect abundance t=-2.61,df=2,p=0.12

Role of plant communities? 1.Plant quality? C:N ratios herbivory

Box elder Goldenrod Blackberry Nepal grassHoneysuckle C:N ratio *

Herbivory (%) Box elderGoldenrod Blackberry Nepal grassHoneysuckle *

Role of plant communities? 1.Plant quality C:N ratios herbivory 2. Diversity

Elevated [CO2]Ambient [CO2] Plant richness t=1.06,df=1.07,p=0.48

Plant richness Insect richness Elevated Ambient

Role of plant communities? 1.Plant quality C:N ratios herbivory 2. Diversity 3. Invasives

Elevated [CO2]Ambient [CO2] Honeysuckle cover (%) df=1,t=1.79,p=0.32

Honeysuckle cover (%) Insect richness R 2 =0.25, p=0.02

Insects InvasionsElevated CO 2

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