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Ecology
Ecology
 The scientific study of interactions between organisms and their environment
Levels of Organization Biosphere = thin zone that contains ALL life of Earth
2. Ecosystem = a self supporting group of communities and their physical environment ,[object Object]
‘bio-’ = life
Abiotic factors: all the NONLIVING part of the environment
‘a-’ = without;
 ‘a’ ‘bio’tic = without life,[object Object]
Levels of organization (continued) 3. Community = all the living organisms in a specific area  (Ex. Pond, forest)
4. Population: = all the individuals of the same species living in the same area at the same time 5. Organism = any living thing
Overview: (largest  smallest) BiosphereEcosystemCommunity PopulationOrganism How to remember order? Big Elephants Consume Peanuts Often
Habitat = the place an organism lives Niche = the role (job) an organism has in it’s community
Species = a group of like organisms that can reproduce AND have fertile offspring
NOT a species
 Cat + rabbit = cabbit? Babies are sterile therefore NOT a species
Lion + tiger = liger Babies are sterile therefore NOT a species
Symbiotic Relationships Symbiosis = the relationship in which there is a close and permanent association between organisms of different species 3 types:
1. Mutualism Relationship in which both organisms benefit Organism 1 =              =  Benefit Organism 2 =              =  Benefit
Example of mutualism Ants and the acacia tree
2. Commensalism = relationship in which one species benefits and the other is neither harmed nor benefited Organism 1 =                = benefit Organism 2 =                = no harm, no benefits
Example of commensalism Spanish moss growing on trees
3. Parasitism Relationship in which one species benefits and the other is harmed Organism 1 =               = benefit Organism 2 =               = harmed
Example of parasitism Tapeworms
Overview
Ecological Niches 1.  Producers: Also called autotrophs ‘auto-’ = self ‘troph’ = feeding These are organisms that make their own food Ex. green plants
2. Consumers: Also called heterotrophs ‘hetero-’ = different Organisms that can NOT make their own food Three categories: A. herbivores: eat plants (primary consumer)
B. carnivores: eat other consumers; eat meat (secondary/tertiary consumers) C. omnivores: eat both plants and animals (tertiary consumers)
3. Decomposers: break down organic matter and return it to the environment
Food Chains The flow of energy and organic molecules from organism to organism Energy for this system originates from the SUN Food chains ALWAYS begin with a PRODUCER
Look at the image to the right and write the correct food chain Grass insects  frog  owl hawk
Food Webs Complex relationships formed by interconnecting and overlapping food chains
Practice Look at the food web diagram provided On a separate sheet of paper write out ALL the food chains  presented within the one food web You should be able to find TEN!!!
Pyramids 1. Pyramid of numbers The higher up the food chain the lower the number of organisms (go to handout)
2. Pyramid of energy 90% of the energy is lost to the environment at each level of the food chain (go to handout) 3. Pyramid of biomass The amount of biomass decreases at each level of  the food chain (go to handout)
BIOMES
Community Distribution Limiting factor: any biotic or abiotic factor that restricts an organism’s ability to survive Ex. Food supply, water supply, living space Tolerance: the ability to withstand fluctuations in biotic and abiotic environmental factors
SUCCESSION = the orderly, natural change in communities over time Primary succession: development of living communities from BARE ROCK NO soil present  Ex. Rock lichens moss ferns shrubs trees mature trees
Pioneer organism: the first organism to inhabit a community (ex. lichens) Climax community: a stable, mature community that undergoes little or no succession Primary succession takes a relatively long time to reach this point
Secondary succession: the development of living communities that takes place when a community is disrupted by natural disasters or human impact Soil IS present Takes less time to reach climax community Ex. Abandoned farms, fires


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Ecology

  • 2. Ecology
 The scientific study of interactions between organisms and their environment
  • 3. Levels of Organization Biosphere = thin zone that contains ALL life of Earth
  • 4.
  • 6. Abiotic factors: all the NONLIVING part of the environment
  • 8.
  • 9.
  • 10.
  • 11.
  • 12. Levels of organization (continued) 3. Community = all the living organisms in a specific area (Ex. Pond, forest)
  • 13. 4. Population: = all the individuals of the same species living in the same area at the same time 5. Organism = any living thing
  • 14. Overview: (largest  smallest) BiosphereEcosystemCommunity PopulationOrganism How to remember order? Big Elephants Consume Peanuts Often
  • 15. Habitat = the place an organism lives Niche = the role (job) an organism has in it’s community
  • 16. Species = a group of like organisms that can reproduce AND have fertile offspring
  • 17. NOT a species
 Cat + rabbit = cabbit? Babies are sterile therefore NOT a species
  • 18. Lion + tiger = liger Babies are sterile therefore NOT a species
  • 19. Symbiotic Relationships Symbiosis = the relationship in which there is a close and permanent association between organisms of different species 3 types:
  • 20. 1. Mutualism Relationship in which both organisms benefit Organism 1 = = Benefit Organism 2 = = Benefit
  • 21. Example of mutualism Ants and the acacia tree
  • 22. 2. Commensalism = relationship in which one species benefits and the other is neither harmed nor benefited Organism 1 = = benefit Organism 2 = = no harm, no benefits
  • 23. Example of commensalism Spanish moss growing on trees
  • 24. 3. Parasitism Relationship in which one species benefits and the other is harmed Organism 1 = = benefit Organism 2 = = harmed
  • 27. Ecological Niches 1. Producers: Also called autotrophs ‘auto-’ = self ‘troph’ = feeding These are organisms that make their own food Ex. green plants
  • 28. 2. Consumers: Also called heterotrophs ‘hetero-’ = different Organisms that can NOT make their own food Three categories: A. herbivores: eat plants (primary consumer)
  • 29. B. carnivores: eat other consumers; eat meat (secondary/tertiary consumers) C. omnivores: eat both plants and animals (tertiary consumers)
  • 30. 3. Decomposers: break down organic matter and return it to the environment
  • 31. Food Chains The flow of energy and organic molecules from organism to organism Energy for this system originates from the SUN Food chains ALWAYS begin with a PRODUCER
  • 32. Look at the image to the right and write the correct food chain Grass insects  frog  owl hawk
  • 33. Food Webs Complex relationships formed by interconnecting and overlapping food chains
  • 34. Practice Look at the food web diagram provided On a separate sheet of paper write out ALL the food chains presented within the one food web You should be able to find TEN!!!
  • 35. Pyramids 1. Pyramid of numbers The higher up the food chain the lower the number of organisms (go to handout)
  • 36. 2. Pyramid of energy 90% of the energy is lost to the environment at each level of the food chain (go to handout) 3. Pyramid of biomass The amount of biomass decreases at each level of the food chain (go to handout)
  • 38. Community Distribution Limiting factor: any biotic or abiotic factor that restricts an organism’s ability to survive Ex. Food supply, water supply, living space Tolerance: the ability to withstand fluctuations in biotic and abiotic environmental factors
  • 39. SUCCESSION = the orderly, natural change in communities over time Primary succession: development of living communities from BARE ROCK NO soil present Ex. Rock lichens moss ferns shrubs trees mature trees
  • 40. Pioneer organism: the first organism to inhabit a community (ex. lichens) Climax community: a stable, mature community that undergoes little or no succession Primary succession takes a relatively long time to reach this point
  • 41. Secondary succession: the development of living communities that takes place when a community is disrupted by natural disasters or human impact Soil IS present Takes less time to reach climax community Ex. Abandoned farms, fires

  • 42. Population Growth Exponential growth: when the number of organisms increases by an ever-increasing rate. 248163264128256etc J-shaped curve
  • 43. Carrying capacity: the number of organisms of a population a particular environment can support over an indefinite period of time S-shaped curve
  • 44. Factors that affect the size of populations 1. Birth rate 2. Death rate 3. Growth rate = birth rate – death rate 4. Immigration: movement INTO and area 5. Emigration: movement OUT of an area