6 Biomes and Aquatic Ecosystems CHAPTER

Too Much of a Good Thing? Elephant populations in southern Africa declined sharply due to hunting but have made overwhelming comebacks within nature reserves and parks. Some worry that elephant overpopulation is causing a decline in local biodiversity and damage to farms and infrastructure. Many efforts to control elephant populations are being considered and put into practice. Elephant populations in southern Africa declined sharply due to hunting but have made overwhelming comebacks within nature reserves and parks. Some worry that elephant overpopulation is causing a decline in local biodiversity and damage to farms and infrastructure. Many efforts to control elephant populations are being considered and put into practice. Talk About It Which elephant population control effort— moving them, sterilizing them, or culling them—do you think has the best chance for long-term, positive effects?

Lesson 6.1 Defining Biomes Fossil evidence suggests that the frozen continent of Antarctica was once covered in temperate forest.

Earth’s Major Biomes Groups of terrestrial ecosystems that share biotic & abiotic conditions 10 primary biomes: tropical rain forest dry forest savanna desert temperate rain forest temperate forest temperate grassland chaparral boreal forest tundra Groups of terrestrial ecosystems that share biotic & abiotic conditions 10 primary biomes: tropical rain forest dry forest savanna desert temperate rain forest temperate forest temperate grassland chaparral boreal forest tundra Did You Know? Taiga is another name for boreal forest. Lesson 6.1 Defining Biomes

Climate and Climatographs Climate: Average conditions, including temperature & precipitation, over long periods of time in a given areaClimate: Average conditions, including temperature & precipitation, over long periods of time in a given area Weather: Day-to-day conditions in Earth’s atmosphereWeather: Day-to-day conditions in Earth’s atmosphere Climatographs: Diagrams that summarize an area’s average monthly temperature & precipitationClimatographs: Diagrams that summarize an area’s average monthly temperature & precipitation Each biome has a set of characteristic organisms adapted to its particular climate conditions.Each biome has a set of characteristic organisms adapted to its particular climate conditions. Lesson 6.1 Defining Biomes

Biomes and Net Primary Production Gross primary production: The rate at which primary producers undergo photosynthesis Net primary production: The amount of organic matter (biomass) that remains after primary producers use some to carry out cellular respiration Ecosystems vary in their net primary productivity, the rate at which primary producers convert energy to biomass. Warm, wet biomes generally have higher net primary productivity than cold, dry biomes. Gross primary production: The rate at which primary producers undergo photosynthesis Net primary production: The amount of organic matter (biomass) that remains after primary producers use some to carry out cellular respiration Ecosystems vary in their net primary productivity, the rate at which primary producers convert energy to biomass. Warm, wet biomes generally have higher net primary productivity than cold, dry biomes. Lesson 6.1 Defining Biomes