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Lecture 4

BIOL 1902 Lecture Notes - Lecture 4: Monarch Butterfly, Hoverfly, Cottontail Rabbit


Department
Biology
Course Code
BIOL 1902
Professor
Michael Runtz
Lecture
4

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Lecture 4
When a group of unrelated animals are all defended and have similar appearances,
(such as the milkweed beetle and milkweed bug) this is known as mullerian mimicry.
Batesian mimicry
when a harmless species resembles a harmful species / mimics the warning
signals directed at a common predator.
the harmless species is a mimic of the model, harmful species.
example: the monarch butterflies and the viceroy butterflies. the monarch
butterfly is the one containing the poison, but the viceroy doesn’t and looks
really similar to it. the viceroy is edible but animals who have eaten the
monarch butterflies are less likely to eat the viceroys since they look the same.
however, the viceroy has a line at the back of its wings that the monarch does
not have.
monarch = poisonous, model.
viceroy = edible, mimic.
this is a form of batesian mimicry.
example: bumblebee and hover fly.
bumblebee = stings, model.
hover fly = harmless, mimic.
the number of models > number of mimics. the more models there are, the
more mimics there will be. also, mimics can only be present in the same
season where the models are present.
You don’t always have to be brightly colored to have a form of chemical defence.
Some toads have the toxin bufotalin in their skin glands.
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