ENV 1101 Chapter 4: Chapter 4.docx

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skytoad178

16 Mar 2012

School

University of Ottawa

Department

Environmental Studies

Course

ENV 1101

Professor

Sonia Wesche

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Document Summary

Compare and contrast the major types of species interactions: Competition results when individuals or species vie for limited resources. It can occur within or among species and it can result in coexistence or exclusion. T can also lead to realized niches, resource partitioning and character displacement. In prediation, one species kills and consumes another. It i the basis of food webs and can influence population dynamics and community composition. In parasitism, one species derives benefit by harming another (but not killing) Herbivory is an exploitative interaction whereby an animal feeds on a plant. Some mutualists are symbiotic, whereas other mutualists are free-living. Energy is transferred in food chains among trophic levels. Lower trophic levels generally contain more energy, biomass and numbers of individuals than higher trophic levels. Food webs illustrate feeding relationships and energy flow among species in a community. Keystone species have impacts on communities that are out of proportion to their abundance.

Related Questions

A keystone species affects relative abundance of species in a community at

the lowest trophic level

the trophic level immediately below it

all higher trophic levels

all but the uppermost trophic levels

21- Define carrying capacity and understand how it can affectpopulation size.

22- Compare and contrast density-dependent and densityindependent factors that affect population growth.

23- Compare and contrast opportunistic and equilibrium lifehistory adaptations.

24- Explain the interactions in communities and ecosystems.

25- Compare and contrast competition, mutualism, commensalism,parasitism, herbivory, and predation.

26- Describe competitive exclusion.

27- Explain how species interactions can lead tocoevolution.

28- Describe and give examples of the importance of keystonespecies.

29- Compare and contrast primary and secondary succession.

30- Explain the roles of producers, consumers and decomposers inan ecosystem.

pearfrog910

All of the organisms plus the nonliving components of a defined area is a/n ____.

Abiotic components of an ecosystem include ___.

The physical place where members of a population typically live is termed a __.

The total of all the resources, both biotic and abiotic, a species exploits for its survival, growth, and reproduction is its __.

When two or more species vie for the same limited resource, _____ occurs.

A relationship between different species in which one species lives in or on another is __.

Which of the following obtain energy and carbon by feeding on producers and one another? (choose one) decomposers, consumers, or producers

A type of symbiosis in which both species benefit is __.

Type of symbiosis where one member of the relationship benefits and has no effect on the other

A type of symbiosis in which one member of the relationship benefits and the other is harmed

Which of the following feed on organic wastes? (choose one) decomposers, consumers, or producers

Organisms that obtain their energy from producers or other consumers are __.

ENV 1101 Chapter 4: Chapter 4.docx

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