Wild Species and Biodiversity
Protecting Endangered Species
1. Snowy egrets were heavily exploited in the 1800s for the (a. meat, b. eggs, c. nests, d. feathers) that were used in (a. fancy restaurants, b. ladies’ hats, c. curiosity shops, d. grocery stores.)
2. Indicate whether the following provisions are strengths [ ] or weaknesses [-] of the Endangered Species Act.
Weakness- the need for official recognition
strength-stiff fines for killing, trapping, uprooting, or commerce of endangered species
weakness-controls on government development projects in critical habitats
weakness-enforcement of the act
3. What are the three crucial elements in the process of designating a species as endangered or threatened?
a. recovery programs- these programs should be implemented so as to ensure the survival and increase of the species.
b. listing- it is important to ensure that the right agency is used to list the species. Also, the right petition should be used.
c. critical habitat- the habitual locations for the species should be allocated by the agency.
4. What environmental or commercial factors led to the decline of the:
Peregrine falcon: the use of pesticides such as Dichloro-diphenyl-trichloroethane (DDT)
Whooping crane: their feathers were in great demand for commercial purposes and many people entered into the hunting business, hence; this led to their decline.
Spotted owl: their old growth habitats have been destroyed by people who are constantly harvesting timber.
Biodiversity and It Decline
5. Over geological time, the net balance between phylogenies and extermination has favored the gradual (accumulation, loss) of species.
6. Which country has at least 5% of all living species? Costa Rica
7. List four sources of evidence that a decline of biodiversity is occurring.
a. extinction of song birds
b. decline of water fowl species
c. reduction of commercial fishing
d. decline of spotted owl
8. In what type of ecosystem can one find the greatest biodiversity? Aquatic ecosystem
9. List six factors that represent evidence of or contribute to the decline in biodiversity.
b. exotic species
c. climate alterations
d. habitat change
e. general pollution
f. increase in human population
10. Match examples with the factors that represent evidence of or contribute to the decline of biodiversity
Example Answer Factor
fragmentation- climate change
Clear-cut logging- overuse
Expansion of human pop over the globe- human population growth
The brown tree snake- habitat alteration
The greenhouse effect- pollution
Prospects of huge immediate profits- exotic introductions
Melting polar ice caps- climate change
16. As human population increases, species survival worldwide will decrease (increase or decrease).
17. According to the figure to the right, the two greatest causes of species extinction are introduction of species and destruction of habitat