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

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Presentation on theme: "What are the combined effects of global climate change and biological invasions on insect community structure?"— Presentation transcript:

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

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

3 Insects InvasionsElevated CO 2

4 Insects InvasionsElevated CO 2

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

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

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

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

12 Box elder Goldenrod Blackberry Nepal grassHoneysuckle C:N ratio *

13 Herbivory (%) Box elderGoldenrod Blackberry Nepal grassHoneysuckle *

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

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

16 Plant richness Insect richness Elevated Ambient

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

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

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

21 Insects InvasionsElevated CO 2


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