Presentation on theme: "Science Warm-up 3/19/2012 ~52. There is a dead man lying in the desert next to a rock. What happened? 62. Two children born in the same hospital, in the."— Presentation transcript:
Science Warm-up 3/19/2012 ~52. There is a dead man lying in the desert next to a rock. What happened? 62. Two children born in the same hospital, in the same hour, day, and year, have the same mother and father, but are not twins. What happened?
~52. The dead man is Superman; the rock is Green Kryptonite. Invent a reasonable scenario from there. ~62. The children are two of a set of triplets.
Chapter 3: Communities, Biomes and Ecosystems. Wood
Chapter 3 Overview Big Idea: Limiting factors and ranges of tolerance are factors that determine where terrestrial biome and aquatic biomes exist. Section 1: Community Ecology Section 2: Terrestrial Biomes Section 3: Aquatic Ecosystems
Section 1: Community Ecology Main idea: All living organisms are limited by factors in the environment. Key Concepts: – Communities p.60 – Ecological Succession p.62
Community A biological community is a group of interacting populations that occupy the same area at the same time. Communities are affected by things called limiting factors.
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
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.
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.
Section 2: Terrestrial Biomes Main Idea: Ecosystems on land are grouped into biomes primarily based on the plant communities in them. Key Concepts: – Effects of Latitude and Climate p. 65 – Major Land Biomes p. 66 – Other Terrestrial Biomes p. 72
Latitude The distance any point on the surface of the Earth north or south from the equator is latitude.
Climate The average weather conditions in an area, including temperature and precipitation, describe the area’s climate. Remember, this is the type of clothes you would find in your closet for a season.
This graph shows how temperature and precipitation influence the communities
Major Land Biomes Biomes are classified by 3 things: – Their plants – The temperature – The amount of precipitation.
Tundra The tundra is a treeless biomes with a layer of frozen soil below called permafrost. Avg temp: -34 to -12 degrees Celsius Avg precipitation: 15-25cm per year Abiotic factors: soggy summers; permafrost; cold and dark much of the year
Section 3: Aquatic Biomes Main Idea: Aquatic ecosystems are grouped based on abiotic factors such as water flow, depth, distance from shore, salinity and latitude. Key Concepts: – Freshwater ecosystems p. 74 – Transitional ecosystems p. 78 – Marine ecosystems p. 79
Rivers and Streams The water flows in one direction, beginning at a source called a headwater and travelling to the mouth, where the flowing water empties into a larger body of water. The faster the water, the lower the number of organisms.
Fast-moving rivers and streams prevent much accumulation of organic materials and sediment.