3 Oct  Is this an alligator or a crocodile?  Agenda  New Seats  Food Chains and webs  Homework  Have a great weekend!

Do any of these vocab. terms look familiar?  Autotroph  Heterotroph  Trophic Level  Producer  Consumer  Decomposer  Herbivore  Carnivore  Omnivore  Organism  Population  Community  Food Chain  Food Web  Food Pyramid  Limiting factor

How well do you remember the levels of organization?

-all organisms of the same species living within an area Populations

 Community  populations of different species that live in the same area Feeding relationships Community

Ecosystem- communities + abiotic factors  Living (Biotic) factors  all plants & animals living in an area  Physical (Abiotic) factors  soil, rock, temperature, moisture, sunlight

biosphere Ecosystem inputs (td2) energy flows through nutrients cycle

Energy flows through ecosystems (Td1) sun producers ( plants, alga, some bacteria ) loss of energy secondary consumers (carnivores) secondary consumers (carnivores) primary consumers (herbivores) primary consumers (herbivores)

Food Chains and Webs

Food chains  Trophic levels  feeding relationships  start with energy from the sun captured by producers  all levels connect to decomposers Fungi Level 4 Level 3 Level 2 Level 1 Decomposers Producer Primary consumer Secondary consumer Tertiary consumer top carnivore carnivore herbivore Bacteria autotrophs heterotrophs

Food webs  Food chains are linked together into food webs  Try to follow a food chain through the web

A better representation of a real food web…. North Atlantic Ocean food web

6 Oct Opening:  Algae beetle larva minnow bluegill pike  Where does all the energy in this food chain come from?  What would happen if minnows were taken out of the food chain?  Agenda  Ecology notes  Efficiency Activity  Homework  none

In the following food web, which organisms would most likely be a/an:  producer  consumer  herbivore  carnivore  omnivore A B C D E F G H I

Feeding levels  How much energy can you get from food?  only the energy that is stored in the organism  80%-90% energy lost from one level to next  food chain can only have 4 or 5 levels Why?

Inefficiency of energy transfer  Loss of energy between levels of food chain  To where is the energy lost? The cost of living! only this energy moves on to the next level in the food chain 15% growth 50% waste (feces) 35% cellular respiration energy lost to daily living

But what about nutrients?  Energy flows through but nutrients cycle  nutrients must be recycled to be available for the next generation  decomposers return nutrients to the soil after creatures die  fungi  bacteria nutrientsnutrients decomposers

Use mathematical representations to support claims for the cycling of matter and flow of energy among organisms in an ecosystem. C 6 H 12 O 6 + O 2 CO 2 + H 2 O + Energy (ATP or Light) Show that matter cycles in an ecosystem... Show that energy flows through an ecosystem…

7 Oct Opening  Agenda  Participation Quiz  Practice energy Problem  Biological Control  Begin Population Work  Homework  None- Test on Friday

Participation Quiz 1. All the organisms of the same species living in an area 2. An organism that can make it’s own food 3. An organism that eats only plant material 4. An organism that breaks down dead material to return nutrients to soil 5. An organism that can eat both animal and plant material A. Decomposer B. Omnivore C. Population D. Community E. Producer F. Carnivore G. Herbivore

Practice Energy Problems  If a mouse eats 200 calories of grain, how much of that energy will be available to the cat that eats the mouse?  E 2 =E 1 (.15)  E 2 = 200 (.15)  E 2 = 30 cal  How much of the original 200 cal. Will be available to the coyote that eats the cat?  E 3 = E 2 (.15)  E 3 = 30(.15)  E 3 = 4.5 cal  If a cat needs 1200 calories a day to survive, how many calories worth of grain would it take to sustain 1 cat?  E 2 = 1200  1200 = E 1 (.15)  E 1 = 8000 cal

Strange Days on Planet Earth – Invaders Biological control – (Min 19- Lake Victoria)

8 Oct Opening  Agenda  Populations  Limiting factors  Homework  Unit 3 (mini)Exam on Friday

What controls populations? Availability of resources -food, water, territory Predation Disease

Human Population Growth 

8 Oct Opening  Agenda  Population Studies  Review  Homework  Test Tomorrow