Bell Ringer:

Define and give examples of the following:1) Autotroph

2) Heterotroph3) Herbivore4) Omnivore5) Carnivore

6) Decomposer

Feeding Relationships & Energy Flow

Feeding Relationships• There are 3 main types of

feeding relationships1. Producer - Consumer

2. Predator - Prey3. Parasite - Host

Feeding RelationshipsProducer- all

autotrophs (plants), they trap energy from the sun

• Bottom of the food chain

Feeding RelationshipsConsumer- all heterotrophs:

they ingest food containing the sun’s energy

HerbivoresCarnivoresOmnivoresDecomposers

Feeding Relationships

CONSUMERS 1. Primary

consumers• Eat plants• Herbivores

2. Secondary, tertiary … consumers

• Prey animals• Carnivores or

Omnivores

Feeding RelationshipsConsumer-Carnivores-eat

meat• Predators

–Hunt prey animals for food.

Feeding RelationshipsConsumer- Carnivores- eat

meat• Scavengers

–Feed on carrion, dead animals

Feeding Relationships

Consumer- Omnivores -eat both plants and animals

Feeding Relationships

Consumer- Decomposers

• Breakdown the complex compounds of dead and decaying plants and animals into simpler molecules that can be absorbed

Label Your Organism:

Producer, Herbivore, Carnivore, Omnivore,

Decomposer, or Scavenger

Nitrosomonas is a genus of bacteria and a decomposer in

the coral reef.

Where would it go in our food web?

Bellringer

• Draw a food chain with at least 5 organisms

• Must include:• 1 producer• 4 consumers (one must be a decomposer)

Energy FlowFood chain- simple model that

shows how energy moves through an ecosystem in ONE direction

The ARROW shows where the ENERGY goes!

Trophic Levels

• Each link in a food chain is known as a trophic level.

• Trophic levels represent a feeding step in the transfer of energy in an ecosystem.

Energy FlowFood web- shows all possible

feeding relationships in a community at each trophic level

• Represents a network of interconnected food chains

• Remember: ARROW = ENERGY

Trophic Levels

• Only 10% of the energy is able to be stored in the organisms tissues and transferred to the next trophic level.

• The rest of the energy was used by the organism for life processes or given off as heat.

Food chain Food web(just 1 path of energy) (all possible energy

paths)

Ecological Pyramids3 Types:• Biomass Pyramid

– Amount of living tissue in an ecosystem

• Energy Pyramid– Flow of energy in an ecosystem

• Pyramid of Numbers– Number of organisms in each

trophic level

These 3 types may be combined!

BiomassBiomass- the amount of organic

matter comprising a group of organisms in a habitat.

• As you move up a food chain, both available energy AND biomass decrease.

• WHY???

Biomass Pyramid

Note: Kilogram (Kg)

is a unit of mass.

Energy Pyramid

Producers- Autotrophs

Primary consumers- Herbivores

Secondary consumers-small

carnivores

Tertiary consumers- top

carnivoresENERGY

10%

100%

1%

0.1%Heat

HeatHeat

Energy PyramidNote: Joules (J) & Kilocalories (C) are units of energy

Pyramid of Numbers