world biomes a group of ecosystems that are related by having a similar type of of vegetation...
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World Biomes
• A group of ecosystems that are related by having a similar type of of vegetation governed by similar climatic conditions– Major Terrestrial Biomes
• Desserts• Grasslands and Prairies• Tropical Rainforests• Temperate rainforests• Coniferous forests• Tundra
Deserts
• Very dry; hot days and cold nights; less than 10in of rain per year
• Thorny bushes and shrubs, cacti – scattered
Grasslands/ Prairies
• Seasonal rainfall; 10-60in of rain per year; frequent fires; soils rich and deep
• Grass species – small and tall dependent on rainfall; some bushes and forests
Tropical Rain Forests
• Non-seasonal; rainfall frequent and heavy; over 95in of rain per year
• Soils thin and poor
• Average temp of 28oC (84oF)
• High diversity of broadleaf evergreens, dense canopy, little understory, vines and epiphytes
Temperate Forests
• Seasonal; temps below freezing in winter, warmer summers – humid; 30-80 in of rainfall per year; well developed soils
• Broadleafed deciduous trees; some conifers (pine trees); shrubby undergrowth –ferns, lichens, and mosses
Coniferous forests
• Seasonal – long cold winters, light precip in winter, heavier in summer
• Soils acidic, much humus and litter
• Conifers – spruce, fir, pine, hemlock; some deciduous –birch and maples; poor understory
Tundra
• Bitter cold – except 8-10wk growing season, precipitation is low, soils thin with permafrost
• Low-growing sedges, dwarf shrubs, lichens, mosses and grasses
Ecosystem Notes• Ecology- the study of Ecosystems• Ecosystem- an area where organisms thrive• Biome- a group of ecosystems that share the
same climatic area. Is determined by type of vegetation and rainfall.
• Biotic Factor- all living organisms in an environment, humans, plants, animals
• Abiotic Factor- non-living parts of an environment, ex- rock, soil, sun
• Habitat- an environment that meets an organism’s needs and functions for survival. Several niches make up a habitat.
• Species- a group of organisms that can create offspring.
• Population- A group of organisms all of the same species living in the same area at the same time.
• Community- A collection of several populations that inhabit a common area.
• Population Density- How many individuals occupying a certain area
• Limiting Factor- anything that would keep something from surviving and reproducing
• Natural Selection- individuals ability to survive into the next generation due to adaptations or an individual evolving to survive.
• Niche- job an organism does within the habitat• Carrying Capacity- amount of population an area
can contain based on resource availability
• Food chain – a chain that hierarchy of different living things each of which feeds on the one below; (basically what eats what…)
• Food web – an interlocking food chain within an ecological community; (what everything eats within an ecosystem)
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