Answered: Monarch butterflies are a foul-tasting,…

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter45: Population And Community Ecology

Section: Chapter Questions

Problem 9RQ: Which of the following is associated with multiple reproductive episodes during a species’ lifetime?...

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Question

Monarch butterflies are a foul-tasting, poisonous species of butterfly. Monarchs feed almost
exclusively on the milkweed plant from which they store large amounts of cardenolides, the
compound that provides monarchs with their characteristic toxicity. Cardenolides in high
concentrations are toxic to monarchs and their predators, but monarchs have developed
resistance to low concentrations of the toxin.
Researchers suspect that environmental temperature affects the amount of cardenolides in
milkweed plants. To investigate this relationship, the researchers measured the proportion of
surviving monarch butterflies raised in isolation on two different species of milkweed at both
normal and increased temperatures (Figure 1).

Describe the effect of warmer temperatures on monarch mortality in monarchs raised on
each milkweed species.

Monarch
Species A
Monarch
Species B
0.5
Normal
Warmer
Normal
Warmer
Climate
Figure 1. The survivability of monarch butterflies that feed on two different species of milkweed in
normal and warmer temperatures.
Proportion of Surviving Monarchs

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