2 Communities, Biomes, and Ecosystems Section 1: Community Ecology Section 2: Terrestrial Biomes Section 3: Aquatic Ecosystems Click on a lesson name to select.
3 3.1 Community Ecology Communities A biological community is a group of interacting populations that occupy the same area at the same time. Oasis
4 3.1 Community Ecology Limiting Factors Any abiotic factor or biotic factor that restricts the numbers, reproduction, or distribution of organisms is called a limiting factor. Includes sunlight, climate, temperature, water, nutrients, fire, soil chemistry, and space, and other living things
5 3.1 Community Ecology Range of Tolerance An upper limit and lower limit that define the conditions in which an organism can survive The ability of any organism to survive when subjected to abiotic factors or biotic factors is called tolerance.
6 3.1 Community Ecology Ecological Succession The change in an ecosystem that happens when one community replaces another as a result of changing abiotic and biotic factors is ecological succession. There are two types of ecological succession primary succession and secondary succession.
7 3.1 Community Ecology The establishment of a community in an area of exposed rock that does not have any topsoil is primary succession.
9 3.1 Community Ecology The orderly and predictable change that takes place after a community of organisms has been removed but the soil has remained intact is secondary succession.
10 3.2 Terrestrial Biomes Effects of Latitude and Climate Weather is the condition of the atmosphere at a specific place and time. One of the keys to understanding these communities is to be aware of latitude and climatic conditions.
11 3.2 Terrestrial Biomes The distance of any point on the surface of Earth north or south from the equator is latitude.
12 3.2 Terrestrial Biomes The average weather conditions in an area, including temperature and precipitation, describe the area s climate. The graph shows how temperature and precipitation influence the communities.
13 3.2 Terrestrial Biomes Biomes are classified by their plants, temperature, and precipitation. Visualizing Global Effects on Climate
14 3.2 Terrestrial Biomes Tundra Average precipitation: cm per year Temperature range: -34 C 12 C Geographic location: South of the polar ice caps in the Northern Hemisphere Abiotic factors: soggy summers; permafrost; cold and dark much of the year
15 3.2 Terrestrial Biomes Boreal Forest Average precipitation: cm per year Temperature range: -54 C 21 C Geographic location: northern part of North America, Europe, and Asia Abiotic factors: summers are short and moist; winters are long, cold, and dry
16 3.2 Terrestrial Biomes Temperate Forest Average precipitation: cm per year Temperature range: -30 C 30 C Geographic location: south of the boreal forests in eastern North America, eastern Asia, Australia, and Europe Abiotic factors: well-defined seasons; summers are hot, winters are cold
17 3.2 Terrestrial Biomes Temperate Woodland and Shrubland Average precipitation: cm per year Temperature range: 10 C 40 C Geographic location: surrounds the Mediterranean Sea, western coast of North and South America, South Africa, and Australia Abiotic factors: summers are very hot and dry; winters are cool and wet
18 3.2 Terrestrial Biomes Temperate Grassland Average precipitation: cm per year Temperature range: - 40 C 38 C Geographic location: North America, South America, Asia, Africa, and Australia Abiotic factors: summers are hot; winters are cold; moderate rainfall; fires possible
19 3.2 Terrestrial Biomes Desert Average precipitation: 2 26 cm per year Temperature range: high: 20 C 49 C; low: -18 C 10 C Geographic location: every continent except Europe Abiotic factors: varying temperatures; low rainfall
20 3.2 Terrestrial Biomes Tropical Savanna Average precipitation: cm per year Temperature range: 20 C 30 C Geographic location: Africa, South America, and Australia Abiotic factors: summers are hot and rainy; winters are cool and dry
21 3.2 Terrestrial Biomes Tropical Seasonal Forest Average precipitation: >200 cm per year Temperature range: 20 C 25 C Geographic location: Africa, Asia, Australia, and South and Central America Abiotic factors: rainfall is seasonal
22 3.2 Terrestrial Biomes Tropical Rain Forest Average precipitation: cm per year Temperature range: 24 C 27 C Geographic location: Central and South America, southern Asia, western Africa, and northeastern Australia Abiotic factors: humid all year; hot and wet
23 3.2 Terrestrial Biomes Mountains If you go up a mountain, you might notice that abiotic conditions, such as temperature and precipitation, change with increasing elevation.
24 3.2 Terrestrial Biomes Penguins in Antarctica Polar Regions Border the tundra at high latitudes Polar regions are cold all year.
25 3.3 Aquatic Ecosystems Freshwater Ecosystems Only about 2.5 percent of the water on Earth is freshwater.
26 3.3 Aquatic Ecosystems Rivers and Streams The characteristics of rivers and streams change during the journey from the source to the mouth.
27 3.3 Aquatic Ecosystems Fast-moving rivers and streams prevent much accumulation of organic materials and sediment. Usually, there are fewer species living in the rapid waters. In slow-moving water, insect larvae are the primary food source for many fish, including American eel, brown bullhead catfish, and trout.
28 3.3 Aquatic Ecosystems Lakes and Ponds The temperature of lakes and ponds varies depending on the season.
29 3.3 Aquatic Ecosystems Lakes and ponds are divided into three zones based on the amount of sunlight that penetrates the water. The area closest to the shore is the littoral zone.
30 3.3 Aquatic Ecosystems The limnetic zone is the open water area that is well lit and is dominated by plankton.
31 3.3 Aquatic Ecosystems The profundal zone is the deepest areas of a large lake. It is much colder and lower in oxygen than the other two zones.
32 3.3 Aquatic Ecosystems Transitional Aquatic Ecosystems Areas of land such as marshes, swamps, and bogs that are saturated with water and that support aquatic plants are called wetlands. Bog
33 3.3 Aquatic Ecosystems Marine Ecosystems The intertidal zone is a narrow band where the ocean meets land. Communities are constantly changing in this environment as a result of disturbance.
34 3.3 Aquatic Ecosystems Open Ocean Ecosystems The photic zone is shallow enough that sunlight is able to penetrate.
35 3.3 Aquatic Ecosystems Open Ocean Ecosystems Below the photic zone lies the aphotic zone an area where sunlight is unable to penetrate.
36 3.3 Aquatic Ecosystems Open Ocean Ecosystems The benthic zone is an area along the ocean floor that consists of sand, silt, and dead organisms.
37 3.3 Aquatic Ecosystems Open Ocean Ecosystems The deepest region of the ocean is called the abyssal zone. Communities and Biomes
38 Chapter Resource Menu Chapter Diagnostic Questions Formative Test Questions Chapter Assessment Standardized Test Practice biologygmh.com Glencoe Biology Transparencies Image Bank Vocabulary Animation Click on a hyperlink to view the corresponding lesson.
39 Chapter Diagnostic Questions Mosses and lichens are the first organisms to appear during which ecological stage of an ecosystem? A. primary succession B. secondary succession C. climax community D. end succession
40 Chapter Diagnostic Questions Which biome is the most diverse? A. tundra B. tropical savanna C. tropical seasonal forest D. tropical rainforest
41 Chapter Diagnostic Questions Where is most of Earth s freshwater supply contained? A. in groundwater B. in streams C. in glaciers D. in wetlands
42 3.1 Formative Questions What is a group of interacting populations that occupy the same area at the same time? A. a biome B. a community C. an ecosystem D. an environment
43 3.1 Formative Questions Which is true of the zone of physiological stress?
44 3.1 Formative Questions A. It is outside the range of tolerance. B. It is the optimum zone for survival. C. Organisms are unable to survive in this zone. D. There are fewer organisms in this zone.
45 3.1 Formative Questions What occurs in the process of ecological succession? A. Environmental factors affect the survival of organisms. B. One biological community replaces another in the ecosystem. C. Organisms adapt to new biotic and abiotic factors. D. Pioneer species move in and replace existing species.
46 3.2 Formative Questions By what characteristics are biomes primarily classified? A. by their average weather conditions B. by their latitudes and climates C. by the type of animal communities within them D. by the type of plant communities within them
47 3.2 Formative Questions Which biome contains short grasses, caribou, polar bears, and has a layer of permafrost below the surface of the soil? A. taiga B. tundra C. arctic grassland D. polar regions
48 3.2 Formative Questions Which biome is called a steppe in Asia, a prairie in North America, and a rangeland in Australia? A. boreal shrubland B. moderate meadowland C. temperate grassland D. tropical savanna
49 3.2 Formative Questions Which is the most diverse of all biomes? A. desert B. tundra C. woodland D. tropical rainforest
50 3.3 Formative Questions Why do oligotrophic lakes contain fewer plant and animal species than eutrophic lakes? A. They have swifter currents. B. They exist near urban areas. C. They exist at higher latitudes. D. They contain less organic matter.
51 3.3 Formative Questions Which region of the lake has the highest biodiversity?
52 3.3 Formative Questions A. littoral zone B. limnetic zone C. profundal zone D. benthic zone
53 3.3 Formative Questions Which is the most diverse ecosystem? A. estuary B. salt marsh C. swamp D. wetland
54 3.3 Formative Questions What makes an estuary such a unique ecosystem? A. the accumulation of nutrient-rich sediments and detritus B. the mixture of waters with different salt concentrations C. the variety of species adapted to live in slow currents D. the wide variety of waterfowl that nest and feed
55 Chapter Assessment Questions Look at the figure. Which is not true of the profundal zone?
56 Chapter Assessment Questions A. dominated by plankton B. deepest area of the lake C. very little light penetrates D. lower in oxygen
57 Chapter Assessment Questions Based on the information in the graph, what can be inferred about carbon dioxide in the atmosphere?
58 Chapter Assessment Questions Answer: The measured increase of carbon dioxide (CO 2 ) in the atmosphere is mainly due to the burning of fossil fuels. As carbon dioxide levels have increased, the average global temperature has increased.
59 Chapter Assessment Questions Use the figure below to infer which abiotic factor might limit the survival of steelhead trout. Answer: Temperature
60 Standardized Test Practice What is the most critical limiting factor for a polar bear? A. precipitation B. soil type C. sunlight D. temperature
61 Standardized Test Practice True or False The mature community in this diagram is a true climax community.
62 Standardized Test Practice For which biome was this data collected? Average precipitation: cm per year Temperature range: 10 C 40 C Abiotic factors: summers are very hot and dry; winters are cool and wet A. desert B. boreal forest C. temperate woodland D. tropical seasonal forest
63 Standardized Test Practice What type of community is likely to exist near the top of a mountain?
64 Standardized Test Practice A. tundra B. arctic desert C. coniferous forest D. temperate grassland
65 Standardized Test Practice What type of organisms enables fish to live in the limnetic zone?
66 Standardized Test Practice A. bottom dwellers B. crustaceans C. insects D. plankton
67 Standardized Test Practice What is the approximate average temperature and annual precipitation in the boreal forest biome? Average temperature ( C) Average precipitation (cm) A B C D
68 Glencoe Biology Transparencies
69 Image Bank
70 Image Bank
71 Vocabulary Section 1 community limiting factor tolerance ecological succession primary succession climax community secondary succession
Communities, Biomes, and Ecosystems Before You Read Before you read the chapter, respond to these statements. 1. Write an A if you agree with the statement. 2. Write a D if you disagree with the statement.
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