Biotic – Abiotic Factors (13.2)

biotic factors (living) – plants, animals, fungi, bacteriaabiotic factors (non-living) – moisture, temp, wind, sunlight, soilbiodiversity – how much variety of organisms; #Species in ecosystem(measure of fitness).keystone species – has an unusually large impact on the ecosystem

Energy in Ecosystems (13.3)producers (autotrophs) – get energy from a nonliving source, like the sun or chemicals• use chloroplasts often• are the base for all the energy, they make it

consumers (heterotrophs) – get energy by eating living, or once-living resources

example: photosynthesis - grass (producer), gazelles (consumer) eat grass, cheetahs (consumer) eat gazelle

PARTNER SHARE 1 – human example

Different Consumers

• Primary Consumers(herbivores): eat producers (grasshoppers/rabbits/deer/etc.)

• Secondary Consumers (carnivores): eat primary consumers (bobcat/dragon flies/fish)

• Tertiary Consumers (omnivores): Eat producers and consumers (bear/wolves/humans).

How producers make energy:

1 – photosynthesis (light is the energy source)• plants/trees create carbohydrates (sugar), to

use as their own food source

2 – chemosynthesis (chemicals are the energy)• bacteria created carbohydrates, using chemicals

(bacteria, rare, in heat vents)

Food Chains + Food Webs (13.4)• Both show energy flow;and producers as the basefood chain – show a simple line between producer and consumers (incomplete)food web – shows the complex version of who eats who (pg. 410)

Food Webs – Energy Flow

examples – food webs

PARTNER SHARE 2 – Difference between food chain/web

consumer typesherbivore – only plantscarnivore – only animalsomnivore – animals and plantsdecomposer – release enzymes onto dead organic matter, breaks into particles, absorb particles; recycle nutrients (fungi)* nutrients from decomposers go back to producers

detritivores - eat dead organic matter (millipede)

specialist – consumer that eats only 1 specific organism generalist – consumers that eat wide variety

Partner Share 3 – Difference between decomposer and detritivore.

trophic levels in a food chainExample: producers are the 1st level, herbivores are the 2nd, carnivores next, omnivores after that (grass, rabbit, bobcat, bear). Primary (1) consumer (herbivores) – grinding teeth; ex: deer, rabbits, caterpillarSecondary (2) consumer (carnivores) – they eat herbivores; ex: frogs, fishTertiary (3) consumer (carnivores) – they eat animals that eat herbivores; ex: black bear, humansDecomposers: break all waste and dead down to nutrients for producers.

Lake Michigan Food Web

Lake Michigan Food Web

Pyramid Models (13.6)energy pyramid – a model of energy flowbiomass – dry mass of the organisms (how much)

*Energy is lost at each level (up to 90%)1. heat (keep body temp. up)

2. waste (unused material)

3. movement4. digestion5. immune system

90% lost

90% lost

90% lost

producers (sunlight for energy)

primary consumers (eat producers)

secondary consumers (eat primary consumers)

tertiary consumers

(eat all other consumers)

Decomposers +Detritivores (break down all waste and dead from other levels, nutrients back to producers).

Example – Energy loss at each trophic level

Make an energy pyramid for Michigan species

bobcat, elk, black bear, coyote, gray wolf, rabbit, mice, deer, grasses, shrubs, algae, bacteria, aquatic insects, land insects, bass, moles, grubs, worms, weasel, frog, fungi

Pick one producer, one primary consumer, one secondary consumer, one tertiary consumer, and one decomposer from this list