Exam 16: Species Abundance and Diversity

In the Grass Park Experiment,researchers have fertilized a grassland at the Rothamsted Experimental Station in Great Britain since 1856.Sampling for species diversity through time shows that rank-abundance curves have gotten __________ over time,indicating _________ species evenness.

A relatively discrete ecological event that kills or damages organisms or alters the physical or biological environment is called a __________.

Robert MacArthur's study of forest warblers suggested that

In terrestrial soils,local patches with high water availability and local patches with high nitrate availability often show rather little overlap.

Joseph Connell's "intermediate disturbance hypothesis" proposes that

In soil and water fertilization experiments,increasing fertilization tends to reduce the number of limiting resources for plant growth until a single resource limits growth of all species.This "ultimate" limiting resource tends to be

Winter storms can affect diversity on intertidal boulders because

A community is defined as

The most serious human-caused threat to endangered species worldwide is

A simple tree community consists of 4 maples,3 oaks,and 1 alder.The species richness of this community is

Prairie dog disturbances maximize plant diversity

Urban centers tend to

A set of species that have similar ways of making their living make up a __________.

Higher species evenness in a community can be measured by a shallower slope on a rank-abundance curve.

In Leon Creek there are 5 species of fish.The species and the number of individuals in each species are as follows: 20 catfish,15 gar,12 large-mouth bass,10 perch,and 2 striped bass.Calculate the Shannon-Wiener index value (H')for this fish community.

Given two habitats,Habitat 1 and Habitat 2,which habitat would have greater species diversity? Habitat 1: Species A,10; Species B,10; Species C,10 Habitat 2: Species A,10; Species B,10; Species C,10; Species D,10; Species E,10

In the Amazon forest,slight changes in soil properties tend to be correlated with

A simple tree community consists of 4 maples,3 oaks,and 1 alder.The Shannon-Wiener diversity of this community is

Concentrations of inorganic nutrients typically don't vary much across the surface of a single lake.

Odegaard's study estimating the number of tropical forest beetles illustrates that sampling from multiple sites