invasive plants show more plasticity than native plants irene weber university of washington hhmi...

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Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

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Page 1: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Invasive plants show more plasticity than

native plantsIrene Weber

University of Washington HHMI Integrative Research Internship

Page 2: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

What is an invasive plant?

Invasive plants are introduced species that can thrive in areas beyond their natural range of dispersal. These plants are characteristically adaptable, aggressive, and have a high reproductive capacity.

USDA National Invasive Species Information Center

Page 3: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Why do we care about invasive plants?

Page 4: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Why do some plants invade?• Ability to reproduce sexually and

asexually• Rapid growth• High tolerance of heterogeneity• Predator release• Phenotypic plasticity in changing

environments

Baker 1965 Sakeital 2001

Page 5: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Full sun conditions

Shade conditions

Poor plasticity

Plant showing plasticity

What is Plasticity?

Page 6: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship
Page 7: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Plasticity in Invasive Species Rumex acetosella vs. Rumex venosus

Invasive Species Non Invasive Species

Page 8: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

SI=((number of stomata)/(total cells: stomata + epidermal)) x 100

((6)/(6+34))x100 = 15

Stomatal Index

Page 9: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Methods

Page 10: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Hypotheses

Pre-industrial stomatal index Stomatal index today

Invasive

Native

jhrl
Before you launch into results, how about a slide of hypotheses? Here's a possibility:Slot in your own pictures of dense vs. non dense stomatal indices - and use custom animation to show the case of plant that is responsive (i.e. plastic - where stomatal index changes a lot) vs. one that isn't.explain again why you expect this...
Page 11: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

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1880 1900 1920 1940 1960 1980 2000

Year plant collected

Sto

mat

al In

dex

Results

Rumex acetosella y = -

0.0264x + 63.985 R2 = 0.2013

Rumex venosus y = -0.0208x + 55.504 R2 = 0.1351

Page 12: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

0

20

40

60

80

100

Invasive SpeciesRumex acetosella

22% SI decrease

Native SpeciesRumex venosus

14% SI decrease

Stomatal Index% Decrease

Page 13: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Conclusions

• The invasive plant shows a greater overall change in stomatal index than the native

• The invasive plant had a greater rate of change than the native plant

Page 14: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Discussion

• This shows a difference in the way that these two species respond in correlation with CO2 increases in the atmosphere

• This is evidence for the plasticity theory of invasive species

Page 15: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Future Directions

• Does this trend hold up for other plants?

• Is this purely due to plasticity or is there a microevolution effect?

Page 16: Invasive plants show more plasticity than native plants Irene Weber University of Washington HHMI Integrative Research Internship

Acknowledgements

University of Washington HHMI Integrative Research Internship

Janneke Hille Ris Lambers, UW Department of Biology

Soo-Hyung Kim and Nicole Hackman, UW College of Forest Resources

UW Herbarium and the OSU Herbarium

Questions?