ecology - loudoun county public schools · habitat –where an organism lives and gets its needs...
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ECOLOGYThe study of living things and
how they interact with each
other and the environment.
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Levels of Organization:
Organism – one member of a species
Population – group of organisms that belong to the same species in an area
Community – group of different populations in an area
Ecosystem – living and non-living things that interact in an area
Biosphere – part of Earth that has life
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Organism Population
Community -
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Habitat – where an organism lives and gets its
needs (example: food, air, shelter, etc.)
Environment – all living/non-living things that
an organism could interact with
Biome – group of ecosystems with same
climate, same dominate plants/animals
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Figure3-2 (page 64)
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Ecosystems and Communities
There are MANY different kinds of ecosystems found
throughout the world.
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Biome:
•Large geographical area that has a
distinct _______ and certain species of
plants and animals.
•Identified by the dominant plant life.
•There are terrestrial (land) and aquatic
(water) ecosystems.
climate
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Climate:Determined by:•Absorption of sun and energy
(temperature).
•Movement of air and water currents.
•Latitude – Polar cold and dry
Equator warm and wet
•Land Masses
•Ocean currents
Cold on West Coast, warm on East Coasts
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Soil:
•Organized mixture of organic, water, air,
and organisms
•____________ -physical break-up of rock
(Ex – Weathering and Chemical)
•____________ decomposed organic
matter in the soil.
• texture water holding capacity
• High in the forests, low in the deserts
Fragmentation
humus
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Terrestrial Biomes
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Tropical Rainforest
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Tropical Rainforest:
•Found along the __________________
• Temperature, rainfall (250cm/yr), humidity
•Little humus and organic litter, poor soil.
•Very high ___________________
Animal Adaptations
•Specialization among organisms
• biodiversity
Threats
•Deforestation - was 20% of Earth’s surface, now ONLY 7%
• Agriculture
equator
biodiversity
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Temperate Rainforest
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Temperate Rainforests:
•50º – 60º N Latitude
• rainfall, moderate temperature
•Pacific NW
•Plant life – redwoods, spruces
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Temperate Deciduous Forest
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Temperate Deciduous Forests:•30º – 50º N Latitude
•Trees drop _________ in the fall to save energy
• Seasons
•Rich layer of humus
•Fertile soil
•N. America, Europe, Asia Forests of maples, beeches, oaks…..
Plant Adaptations
•Broad, thin leaves with large surface areas for maximum light absorption
• Seeds and underground stems survive winters
Animal Adaptations
•High Biodiversity
•Most birds migrate to warmer climates
•Some mammals drastically reduce their metabolic rate in the winter (hibernation)
leaves
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Taiga
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Taiga:
•Northern coniferous forests just south of the Arctic Circle
•Long cold winter 6-10 months
• Short growing seasons enhanced by constant sunlight.
•Snow precipitation
Plant Adaptations
• Conifer leaves are thin and waxy to retain water
• Cones protect seeds
Animal Adaptations
• High Biodiversity in the summer
• Birds migrate south in winter
• Animal fur is thick and insulated
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Tropical Savannas
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Tropical Savannas:
•Around the equator
•Main vegetation _________________
• Low precipitation and moisture
•Frequent fires, and herbivores
Plant Adaptations
•Large underground root systems to survive the dry season AND fires
• Thorns and sharp leaves to protect from herbivores
Animal Adaptations
•Large herbivores specialized for different levels of vegetation
•Migratory
•High number of carnivores
grasses
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Temperate Grasslands (Prairies,
Steppes, Pampas)
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Temperate Grasslands (prairies, steppes Pampas):
•_____________ part of continent
•Main vegetation grasses
•Very fertile soil, little rainfall
•Was 42% of Earth’s surface now only 12%
•________________ common
Plant Adaptations
•Grasses are perennials survive year to year
•Few trees can survive
•Root system is dense to protect from droughts
Animal Adaptations
•Few large herbivores
•Underground Burrows
Threats
•Agriculture (wheat, corn, rice)
•Overgrazing soil erosion
inland
fires
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Deserts
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Deserts:•There are many kinds of deserts.
•< 25 cm rainfall per year
•Soil is rich in minerals BUT little organic matter
•Some produced by ______________________
•Rain falls on the winward side of _____________
•Dry air is swept over the leeward side
Plant Adaptations
•Thick, fleshy stems with wax covering
•Spines to protect against predators
•Sudden growth spurts
Animal Adaptations
•Estivation summer sleep
•Nocturnal
•Absorb water from food.
Threats
•Increasing residential areas
•Recreational vehicles
Rainshadow effect
mountains
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Tundra
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Tundra:
•_____________ permanently frozen layer of ground 6 in
below the surface
•Dotted with pools of water lots of insects
•Treeless
Plant Adaptations
•Mosses and lichen covered rocks
•Short and woody plants
•Reproduce quickly in brief summer
Animal Adaptations
•Migratory birds
•Reindeer and caribou move to find food
•Small rodents burrow underground
Threats
•Oil removal and transportation
•Land easily damaged and slow to recover
Permafrost