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Ecology –Ecology –Organisms & Their Organisms & Their EnvironmentEnvironment
Dr. Childs
Science Computer Lab
Spring, 2005
EcologyEcology
Ecology is the interaction of living organisms and their environment
This lesson will emphasize:• Relationships between organisms• Food webs
Biotic & Abiotic FactorsBiotic & Abiotic Factors
Biotic Factors - Living organisms
Abiotic Factors–Nonliving
Biotic FactorsBiotic Factors
Plants & Animals
Abiotic FactorsAbiotic Factors
Soil
Sunlight
Water
Climate
Rocks Air
Aquatic Ecosystem
Population
Community
EcosystemTerrestrial Ecosystem
Organism
RelationshipsRelationships
Marine Ecosystem
OrganismOrganism- A single living individual
PopulatioPopulationn
-A group of organisms of the same species-Live in same area- Interact & interbreed
CommuniCommunityty
- Populations of different species of plants and animals that live together and interact with each other
EcosysteEcosystemm
- A community with biotic and abiotic factors.
- terrestrial land- aquatic fresh water- marine salt water
EcosystemEcosystem
Terrestrial Terrestrial EcosystemEcosystem
- Terrestrial ecosystem
- Examples:- forest- desert- field- jungle- large dead tree
Aquatic EcosystemAquatic Ecosystem
- Aquatic ecosystem
- Examples:- lake- stream- river
Marine EcosystemMarine Ecosystem
- Marine ecosystem
- Examples:- ocean- estuary- tidepools
Community Community InterrelationshipsInterrelationships- Symbiosis:
-Mutualism-Commensalism-Parasitism
- Predation
MutualismMutualism
- Both organisms benefit
Clownfish & anemone
Insects and flowers
Lichen – algae & fungi
Termite protozoa – digests cellulose
CommensalismCommensalism
- One organism benefits, other not harmed
Remora fish on turtle
Barnacles on mussel
Cattle egrets with cowsSpanish moss on oak
ParasitismParasitism
- One organism benefits, other harmed, but not killed
Tapeworm in intestine
Ticks on dog
Fungus on human
Malaria in human blood
PredationPredation
- One organism benefits (predator), other is killed (prey)
Food ChainsFood Chains
Food chains show how animals get their food. They also show how energy is gained and lost in an ecosystem.
Autotrophs
Produce own carbon compounds (sugars)• Energy from sunlight - photosynthesis
• Includes algae and plants
Heterotrophs
Carbon compounds from other organismsFungi (include decomposers)Protozoa and animals
HerbivoresHerbivores
Herbivores are animals that eat only plants
Flat grinding molars
CarnivoresCarnivores
Carnivores are animals that eat other animals- Meat-eaters
CarnivoresCarnivores
Pointed canines for grasping and tearing
OmnivoresOmnivores
Omnivores are animals that eat both plants and animals
OmnivoresOmnivores
Both sharp canines & grinding molars
And our favoriteAnd our favorite
Pizza-vores
Food ChainsFood Chains
Sunlight
Producer
Secondary consumer
Primary consumer
Scavenger
Decomposer
SunlightSunlight
Sunlight is the source of energy in an ecosystem.
ProducersProducers
Producers:
- are green plants- capture energy from the sun- convert to sugars by photosynthesis- fix CO2 into sugars- release oxygen (O2)- are autotrophs
ProducersProducers
Algae
Microscopic plankton
Primary Consumers / Primary Consumers / HerbivoresHerbivores
Primary consumers eat producers / plants- herbivores- heterotrophs - among the smallest and largest creatures
Primary Consumers / Primary Consumers / HerbivoresHerbivores
Secondary Consumers
Secondary consumers eat primary consumers.
Secondary Consumers
ScavengersScavengers
Scavengers:- Eat dead and rotting meat
Vulture Hyena
DecomposersDecomposers
Decomposers:
Digest and break down dead bodies into simple molecules. Recycle nutrients.
- Includes: fungiinsects bacteriaworms
Decomposers
Food WebsFood Webs
-The interactions among animals for food is never as simple as food chains. For example, bears may eat plants or small animal. Eagles may eat fish or small mammals.
-These interactions are called a “food web”.
Food Webs - TerrestrialFood Webs - Terrestrial
Food Webs - MarineFood Webs - Marine
Trophic LevelsTrophic Levels
- Levels is a food chain may be defined in terms as energy as “trophic levels”.
-Energy is lost through each trophic level. This energy is used to maintain the organism or even lost as heat.
Trophic LevelsTrophic Levels
-Organisms are the same trophic level get their energy from the same sources.
-There are rarely more than 4 or 5 trophic levels because of the amount of energy lost.
Trophic LevelsTrophic Levels
Sunlight
1st trophic Level
2nd trophic Level
3rd trophic Level
4th trophic Level
Note: grasshopper and rabbit are at the same trophic level
Energy PyramidsEnergy Pyramids
Energy pyramids represent the amount of total energy in a trophic level. May be represented as “calories” or “joules”
Producers are at the bottom and each trophic level in on top.
Energy PyramidsEnergy Pyramids
-The size of each level represents the biomass – the sum of the mass of all the organisms at that level.
-Be aware that sometimes the producer levels are smaller than the consumers because the producer may reproduce much faster.
- There may be only about 10% of energy from one level to the next.
Energy PyramidEnergy Pyramid
Energy PyramidEnergy Pyramid
Energy Energy PyramidPyramid