Exam 8: Community Ecology

STAGE -Which letter in the diagram corresponds to the stage in which perennial weeds and grasses are plentiful?

In modeling ___________________________________,one may assume that the growth rate of a species will decrease as the population of its competitor's increases.

WARBLERS -According to the above diagram,when different species of warblers inhabit the same area,is food competition reduced?

Which term refers to a species whose role in an ecosystem is much more important than its abundance would suggest? 

Which pair of predators exemplify resource partitioning by being active during different periods of time? 

Different types of species in a community,whether native or non-native,may play similar roles in the community's ecology.

What is provided by disturbances of most terrestrial ecosystems? 

In what habitat would you find the greatest abundance of biodiversity? 

An ecologist observes that squirrels from an adjacent area have brought pine cones to a stand of dense hemlock,but no pine seedlings have sprouted.Which term describes what the ecologist has observed? 

Which of the following is a natural disturbance? 

While observing beetles that can raise their abdomens and give off a defensive chemical that repels predators,an entomologist discovers a different species of beetle that also raises its abdomen but gives off no defensive chemical.What is the second beetles' defensive behaviour called? 

Which category are sea stars,dung beetles,and beavers generally considered to belong to? 

STAGE -Which letter in the diagram corresponds to the stage in which shrubs grow?

Scientists are studying the effective ____________________ system of sharks to determine why they rarely get cancer.

Human overharvesting of natural resources has contributed to reducing the Earth's net primary productivity.

A new kitten is added to a home with an established older cat.The older cat gobbles up the kitten's food in addition to its own food.Which term refers to the behaviour of the older cat? 

The introduction of a non-native species-for example,kudzu-results in a negative impact on the environment.

Which natural change would be considered gradual rather than catastrophic? 

Many sharks are predators near the top of ocean food chains and thus play an important role in their ecosystems.

Give one example of chemical warfare used by animals to attack their prey.