Ecology 6.2 feeding relationships and cycles

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• Middelbare school
• vwo
• Leerjaar 3

Ecology 6.2 - Feeding relationships and cycles

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6.2 Feeding relationships and cycles

What is a food web?

What is a food chain?

Feeding relations

Water cycle

Carbon cycle

When an organism is eaten, the high-energy substances end up in the next link up in the food chain. In an ecosystem, every substance goes through a nutrient cycle.

What examples are given of how wolves change the ecosystem?

How do wolves change rivers?

WHAT

* read 6.2

** make and check ass. 6.2 (1-6)

*** test yourself 6.1 and 6.2 + flashcards

HOW

alone

in silence

NEED HELP

1. read the text again
2. raise you hand

actie - IN SILENCE

Nutrient cycle

Plants provide the food for other animals, they are producers (first link)

Animals eat (consume) the plants. They are consumers. 

Producers -> primary consumers -> secondary consumers etc. 

Not all plants and animals get eaten.. they can also simply die. Scavengers will use remains. 

producent = plants

(produce food)

consumers = animals (consume food)

decomposers = scavengers and breakdown agents

Nutrient cycle

Consumers

Animals consume (eat) substances made by plants (glucose) 

Primary consumers: herbivores - eat the producers (plants)

Secondary consumers: carnivores/omnivores - eat the primary consumers

Cycle continues up the food chain.

Decomposers / breakdown agents

• Organisms that break down organic/dead matter into minerals, CO₂ and water
• scavengers + breakdown agents
• break it
• provide nutrients for producers

Scavengers vs breakdown agents

organism that eats the dead remains of plants and animals

bateria + fungi  that breaks down the dead remains of other organisms 

Assign a food web

Sloths

The sloth from Brazil hangs upside down in the trees of the rainforest for most of its life. It feeds on leaves and young buds. Once a week he descends to relieve himself in a hole. Among other things, dung beetles = mestkevers are attracted to this. Microscopic algae live in the sloth's coat, which gives it its green camouflage color. Between the hairs there are also small insects that live on the algae and hair lice that use the hair as food.

Bacteria and yeast live on the food waste in his intestines.

Use the bold organisms to construct a food web, take a picture and put it on the next slide

upload your food chain here

Nutrient cycle

Water cycle

Evapotranspiration

6.2 Cycles

In an ecosystem, every substance goes through it's own cycle.

Water cycle

Carbon cycle

Nitrogen cycle

Study figure 12 and 13 explain how water and carbon are moving through our biosphere

Carbon cycle

CO₂ is used by producers for photosynthesis

Glucose is then used to make more energy-rich substances

Energy-rich substances consumed by consumers and reducers

Carbon cycle

Plastic Soup

To much plastic waste

Does not break down quickly and ends up in the sea.

Big floating islands consisting of plastic

Biodegradable waste

Non-biodegradable waste

WHICH OF THESE TERMS CONTAIN BOTH BIOTIC AND ABIOTIC FACTORS.

1. COMMUNITY
2. POPULATION
3. ENVIRONMENT
4. ECOSYSTEM

How many different species does the rabbit eat according to this food web?

1. 1
2. 2
3. 3
4. 4

Why is it always producers that are at the start of a food chain / food web?

Why are decomposers important?

Homework

- BS 6.2 make assignment 1 to 3 + 5 to 10