Presentation on theme: "QOTD - NO MARK QUIZ 1. The number of deer in a forest is called…"— Presentation transcript:
1QOTD - NO MARK QUIZ 1. The number of deer in a forest is called… THE POPULATION2. Which does not belong? Sunshine, Water, Dirt or a rotting log?ROTTING LOG (Biotic)3. Name one ecologically significant region in Can.GREAT LAKES, PRAIRIES, CDN. SHIELD, ETC.4. The variety of living things is called…BIODIVERSITY5. The process by which plants produce food is…PHOTOSYNTHESIS
3Energy in an EcosystemAll living elements play a role in the functioning of an ecosystem.As energy flows through the ecosystem, it is passed from one organism to another.The energy coming into an ecosystem originates from the Sun.
5ProducersCapture energy from the sun and convert it to food energy (Photosynthesis).Plants use this food energy and soil nutrients to live and reproduce.When plants are eaten, some of this energy is passed along.
6Types of Consumers Consumers must eat to obtain their energy. All animals are consumersHERBIVORE
12FOOD CHAINA connection of organisms showing the transfer of energy from one organism to the next.
13Question…WHAT’S WRONG WITH JUST USING FOOD CHAINS TO DESCRIBE THE RELATIONSHIPS WITHIN ECOSYSTEMS?FOOD WEBS are more realistic!
14TROPHIC LEVELSA way of categorizing living things according to how they gain their energy.The 1st trophic level contains Autotrophs (organisms that make their own food)Each higher level contains Heterotrophs (eat others for energy)
18Energy Flow! What is this illustration telling us? -Trophic levels - Food web- Energy Transfer?
19Not all of the Sun’s energy is captured. As you go along up the trophic levels, energy is lost.
20Energy Pyramid[1 joule is the absolute minimum amount of energy required (on the surface of Earth) to lift a one kilogram object up by a height of 10 centimeters.]So each level loses about 90% of the energy in the previous level! And where does it go?HEAT!
21BIOMASS! Biomass Pyramid The dry weight of all organisms in all in an ecosystem is known as:BIOMASS!So: As the amount of energy decreases ↓, so does the BIOMASS.Therefore: there are fewer animals at each trophic level
22Numbers Pyramid For example, in an forest ecosystem: - Grasses = 10,000,000,000 organisms- Grasshoppers = 27,000,000- Frogs = 90,000- Trout = 300- Bear = 5
23BioaccumulationBioaccumulation: How substances (usually toxic) build up in a biological systemBiomagnification↑ increased concentration of a toxin in the bodies of consumers at each trophic level.