Ch.53 - Community EcologySee all chapters
All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology

Community Structure

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Community Interactions
Community Structure

Concept #1: Community Structure

Concept #2: Trophic Structure

Concept #3: Key Species and Enviornmental Disturbances

Concept #4: Ecological Succession

Concept #5: Glacier Bay Alaska

Concept #6: Biogeography and Species-Area Curve

Additional Problems
According to the nonequilibrium model of community diversity, ________.a. community structure remains stable in the absence of interspecific competitionb. communities are assemblages of closely linked species that are permanently changed by disturbancec. interspecific interactions induce changes in community composition over timed. communities are constantly changing after being influenced by disturbances
The feeding relationships among the species in a community determine the community's a. secondary succession. b. ecological niche. c. species richness. d. trophic structure.
Based on the intermediate disturbance hypothesis, a community's species diversity is increased by a. frequent massive disturbance. b. stable conditions with no disturbance. c. moderate levels of disturbance. d. human intervention to eliminate disturbance.
According to the island equilibrium model, species richness would be greatest on an island that isa. large and remote.b. small and remote.c. large and close to a mainland.d. small and close to a mainland.
Food chains are sometimes short because a. only a single species of herbivore feeds on each plant species. b. local extinction of a species causes extinction of the other species in its food chain. c. most of the energy in a trophic level is lost as energy passes to the next higher level. d. most producers are inedible.
Which of the following could qualify as a top-down control on a grassland community? a. limitation of plant biomass by rainfall amount b. influence of temperature on competition among plants c. influence of soil nutrients on the abundance of grasses versus wildflowers d. effect of grazing intensity by bison on plant species diversity
The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is thata. tropical communities are younger.b. tropical regions generally have more available water and higher levels of solar radiation.c. higher temperatures cause more rapid speciation.d. diversity increases as evapotranspiration decreases.
Examine this food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow. Answer the following questions concerning this figure. Which species would most likely be a cheetah? 
Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Elephants can be defined as what type of species in this community? a. keystone b. redundant c. dominant d. dominant and keystone  
The following question refer to the organisms in a grassland ecosystem listed below.Tertiary consumer _________a. hawksb. snakesc. shrewsd. grasshopperse. grass
Forest fragmentation is likely to result in _________.a. a loss of species that live in open habitat.b. an increase in forest-species diversityc. a loss of species that live in the interior of forests.d. B and C onlye. A, B, and C
Examine this food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow. Answer the following questions concerning this figure.Which species is a producer? 
Examine this food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow. Answer the following question concerning this figure.Which species is most likely the decomposer? 
Refer to Figure below, the diagram of a food web, for the following question. (Arrows represent energy flow and letters represent species). Which species in the above figure might be described as an omnivore?a. Db. Bc. Ed. Fe. I
There are fewer lions in Africa's Serengeti than there are zebras. This is principally because _____.A. there is less energy available in zebras to support thelion population than there is in grass to support the zebra populationB. zebras tend to drive off lionsC. lions compete directly with cheetahs, while zebras do not have any competitorsD. zebras have mutualists that increase their population, while lions do not
Distinguish between primary and secondary succession with examples.