Discussion Post
- Why is it more difficult for top carnivores to obtain sufficient energy resources than it is for animals lower on the food chain?
- What sorts of genetic changes are more common in smaller populations than large ones? Are these problematic and, if so, how?
- Is it important for people to try to protect endangered species?
- What does island biogeography theory suggest about the ideal design of a nature preserve? (Think of a preserve as a habitat island.)
- What are some reasons why the number and size of nature preserves are limited? In your answer, consider what you know about both local and international pressures (social, economic, and political).
- How and why might animals and plants move between habitat patches?
- As Haddad et al. point out, we often think of forests as good habitat (ideal for corridors), when they could be a barrier. What sorts of species might Haddad and colleagues be studying for which pine forest can serve as a barrier?
- Haddad and colleagues conclude that In our study, we lack data on population viability and genetic diversity, and our dramatic increases in movement to connected patches strongly suggest, but do not demonstrate, the value of corridors.
- Do you think this statement (suggest, but do not demonstrate) is a fair assessment of their study? Explain your answer.
- What other data are the researchers suggesting they need to conclusively demonstrate the importance of corridors? Do you think they are right? For example, does knowing the level of genetic variability answer questions about long-term population survival?
- How could researchers collect these data? Give suggestions for several of the species in their study.
- Based on what you know from the Haddad et al. study, what would be the effects of a border fence on the population of jaguars mentioned in Part I? Explain your thinking. Specify any additional information you need in order to make sound predictions.
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