GPH chapter 11
Terms in this set (28)
In a community, biodiversity can be measured by _____.
all of the above
the number of different species
the relative abundance of different species
the spatial distribution of different species
In a well-studied portion of Everglades National Park, researchers assessed the recovery from a damaging hurricane. They found that one particular swamp grass benefited from the damage and became even more abundant. In addition, they found that no species were lost, leaving the same total number of species in this region. As a result of the hurricane, this region has experienced _____.
no change in species diversity but a decrease in species evenness
Biodiversity is ___
the variety of life in all its forms and combinations and at all levels of organization
In experimental plots of plants tested in Minnesota, primary production, nutrient uptake, and water use were enhanced as _____.
species richness increased
Ecotourism throughout the world relies upon _____.
a widespread interest in exploring natural environments
How is genetic variation maintained in most populations?
through sexual reproduction
In a region identified as a biological hotspot, we would expect to find _____.
very high numbers of endemic species
Most of the 80% of animals that live on land are ________.
Species richness is affected by many variables. As one travels to higher latitudes, one would expect ________.
the number of species to decrease
The graph depicting island diversity predicts that ___
large islands close to the mainland will have the most species
Which of the following would most likely increase species diversity?
creating natural corridors between several isolated state parks
What two factors largely determine the diversity of species on an island?
migration and extinction
In 1968, Garret Hardin described an environmental problem in which shared environmental resources may be depleted as individuals maximize their gains by disproportionately using the resource. He called this "The Tragedy of the Commons." Which of the following threats to biodiversity best reflects this "Tragedy of the Commons?"
the decline of fish populations due to overexploitation
Of all the threats to biodiversity, the single greatest threat is ________.
Forest songbirds have been declining for the past century in the U.S. Evidence is accumulating and pointing to ________ as the most likely reason.
Habitat fragmentation has been an important factor in the decline of ________ species in the U.S.
shad and salmon
What percentage of North America's deciduous forests has been logged or cleared for agriculture?
According to the Endangered Species Act, species whose population is reduced to near critical levels but is not on the brink of extinction is said to be ________.
In many countries, wilderness preserves are separated from each other by many miles. Which of the following would help maintain biodiversity in these isolated preserves?
Create migration corridors using abandoned railways or streams to connect the preserves.
The foremost threat to species viability is _____.
availability and quality of habitat
Passed in 1900, one of the most significant laws to protect wildlife from illegal killing or sale is the _____.
The ban on whaling has been more effective than the ban on the hunting of rhinos because _____.
it is much easier to find and illegally kill rhinos than whales
The most important protection limiting international trade in endangered species is _____.
Why do we classify lionfish populations near the eastern United States as an invasive species? What suggests that these new populations are not an expansion of the lionfish's natural range?
Lionfish are native to the tropical Pacific. There are no natural water routes of warm water between the Pacific and Atlantic oceans.
Based upon what we are learning about the lionfish diet, what is most likely going to happen to Caribbean coral reefs invaded by lionfish?
There will be fewer algae-eating fish. More algae will grow over and damage corals.
What characteristics of lionfish contribute to their ability to spread and become established in new areas?
A single lionfish female may produce up to 2 million eggs a year. The eggs float for up to a month, spreading the lionfish populations.
How did the fish biologists determine the diet of lionfish in the regions where the lionfish have invaded?
Biologists examined the contents of the stomachs of lionfish caught in the wild.
Based upon what we are learning about invasive lionfish populations in the Caribbean and along the Atlantic coast of the United States, these lionfish populations __________.
cannot be eliminated by any means currently known