Monarch Butterflies, Viceroy Butterflies, and Mimicry
Connections to the Course
Anmol, Ayah, Jessika
Loss of Milkweed
- Milkweed contains cardenolides, a steroid that is a cardiac arrester and toxic to predators
- Predators throw up when they eat monarch butterflies and learn not to eat them
- Viceroy population survives by mimicry
- loss of milkweed due to herbicides
- only plant that monarch caterpillars feed on
- estimated 90% decline in population in last year
- also effects mimicry
http://www.learner.org/jnorth/tm/monarch/Predation.html
http://www.wildflowersofontario.ca/milkweed.html
Mullerian Mimcry
http://www.bigblogofgardening.com/home-gardeners-can-save-the-monarch-butterfly-with-milkweed/
- when mimic is also well defended as the model
- if the viceroy butterfly is also unpalatable
melvynyeo.deviantart.com/art/batesian-mimicry-320872230
http://www.dendrobates.org/imitator.html
Batesian Mimcry
http://www.stmary.ws/highschool/science/APBIO/Populations/defense_mechanisms.htm
- model is more highly defended then mimic
- monarch butterfly is the model
- viceroy butterfly is the mimic
http://networkofideas.wordpress.com/2010/11/01/the-monarch-butterfly-vs-the-viceroy/
Background Info
- monarch caterpillars feed on bitter leaves of milkweed plants
- they store the bitter chemicals from the plant
- makes monarch butterflies tolerant to milkweed and unpalatable to predators
- viceroy butterfly has same colouration , but tasty to predators
http://whyfiles.org/129sci_fable/4.html