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Components of global change

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. Invasions. Elevated CO 2. Insects. Invasions. Elevated CO 2.

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Components of global change

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

  2. Components of global change Habitat loss Elevated CO2 Climate change Invasive species

  3. Insects Invasions Elevated CO2

  4. Insects Invasions Elevated CO2

  5. What are the combined effects of elevated CO2 & plantinvasions on insect community structure?

  6. 40 t=-9.91, df=3, p=0.002 30 20 Insect richness 10 0 Elevated [CO2] (n=2) Ambient [CO2] (n=3)

  7. 60 t=-2.61,df=2,p=0.12 50 40 30 Insect abundance 20 10 0 Elevated [CO2] Ambient [CO2]

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

  9. 35 * 30 25 20 C:N ratio 15 10 5 0 Box elder Blackberry Nepal grass Honeysuckle Goldenrod

  10. 35 * 30 25 20 Herbivory (%) 15 10 5 0 Blackberry Box elder Goldenrod Nepal grass Honeysuckle

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

  12. 12 t=1.06,df=1.07,p=0.48 10 8 Plant richness 6 4 2 0 Elevated [CO2] Ambient [CO2]

  13. 50 Elevated Ambient 40 30 Insect richness 20 10 0 0 5 10 15 20 Plant richness

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

  15. 70 df=1,t=1.79,p=0.32 60 cover (%) 50 40 30 20 Honeysuckle 10 0 Elevated [CO2] Ambient [CO2]

  16. 50 R2=0.25, p=0.02 40 30 Insect richness 20 10 0 0 20 40 60 80 100 Honeysuckle cover (%)

  17. Insects Invasions Elevated CO2

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