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Dionaea Dionaea

Dionaea - PowerPoint Presentation

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Dionaea - PPT Presentation

Muscipula and Natural Selection By Nancy Tang and Celia Gurney Our Question and Hypothesis How did evolution by natural selection lead to Dionaea muscipula becoming carnivorous ID: 572423

plants carnivorous evolution amp carnivorous plants amp evolution plant muscipula dionaea carnivory trapping botany journal traits american ellison 2009

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Slide1

Dionaea

Muscipula and Natural Selection

By Nancy Tang and Celia GurneySlide2

Our Question

and HypothesisHow did evolution by natural selection lead to Dionaea

muscipula

becoming carnivorous?

There was genetic variation within the

Dionaea

muscipula

population. Over time, members of the population with traits that aided in catching and digesting insects had more reproductive success than those that lacked such traits. Over time, the alleles for

carnivory

became fixed. Slide3

Experiments

Karagatzides and Ellison (2009) found that leaves cost more energy to produce than trapping mechanisms, but trapping mechanisms produce less energy from photosynthesis.Cameron et al. (2002) used DNA analysis to hypothesize which type of carnivorous plant the Dionaea muscipula evolved from.Slide4

The trapping mechanismSlide5

Dionaea’s Ancestor?Slide6

What we know about

Dionaea’s evolutionDarwin hypothesized that natural variation among plant species led to certain plants having sticky glands that also had digestive capabilities (Albert et al., 1992).

A parsimony analysis by Albert, Williams, and Chase (1992) suggests that

carnivory

evolved at least six separate times

within the angiosperm monophyletic group. Slide7

Discovery Channel Video

A Fly's Worst NightmareSlide8

Further Research Questions

Which traits that aid in carnivory evolved first? Was it the sticky glands? Digestive capabilities?Which parts of their insect victims are the most useful to plants?Slide9

References

Albert, V. A., Williams, S. E., & Chase, M. W. (1992). Carnivorous plants: Phylogeny and structural evolution. Science, 257(5076), 1491-1495.Cameron, K. M., Wurdack, K. J., & Jobson, R. W., (2002). Molecular evidence for the common origin of snap-traps among carnivorous plants. American Journal of Botany, 89(9), 1503-1509.Ellison, A. M., Gotelli, N. J., (2008). Energetics

and the evolution of carnivorous plants—Darwin’s ‘most wonderful plants in the world’.

Journal of Experimental Botany

, 60(1), 19-42.

Forterre

, Y.,

Skothelm

, J., M.,

Dumals

, J., &

Mahadevan

, L. (2005). How the Venus flytrap snaps.

Nature, 433

, 421-425.

Gibson, T. C., & Waller, D. M., (2009). Evolving Darwin’s ‘most wonderful’ plant: Ecological steps to a snap-trap.

New

Phytologist

, 183, 575-587.

Karagatzides

, J. D., & Ellison, A. M., (2009). Construction costs, payback times, and the leaf economics of carnivorous plants.

American Journal of Botany

, 96(9), 1612-1619.

Williams, S. E. (1975). Comparative sensory physiology of the

droseraceae

—the evolution of a plant sensory system.

American Philosophical Society, 120(3)

, 187-204.Slide10