Exam 18: Community Dynamics

Which is the more correct view of communities?

The initial floristic composition hypothesis proposes that the process of succession at any site is dependent on which species arrive first.

Diversity often decreases during the later stages of succession.

Beach grass colonizing newly formed sand dunes is

Which of the following is an example of an allogenic change that drives succession?

The hypothesis that moderate frequencies of disturbance result in the highest species diversity is called the ________ disturbance hypothesis.

As glaciers in North America melted,formerly glaciated areas were invaded by

Succession usually involves only autotrophic species such as plants.

Which is an example of secondary succession?

Which of the following best describes diversity change through time in succession?

The study of the distribution and abundance of ancient organisms and their relationship to the environment is referred to as ________.

Pollen preserved within lake sediments can be used to reconstruct historical changes in the geographic ranges of plant species.

During plant succession,animals can quickly lose their habitat by vegetation change.

Why do we think that the forest communities of eastern North America have changed dramatically over the past 18,000 years?

Disturbances,such as fire,can sometimes increase coexistence between species and can increase diversity.

Who developed the monoclimax hypothesis?

For processes such as those in the figure that can take thousands of years,how can we know that succession can occur in this way?

The monoclimax hypothesis views succession as the gradual and progressive development of the community to the ultimate stage.

The Hubbard Brook Experimental Forest is best known for what occurring after forest clearing?

Groups of sites within an area that are at different stages of succession are known as