Ecology 6.2 + start 6.3

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

Ecology 6.3 - Feeding relationships

Today

Recap: Abiotic, biotic and levels of ecology.

6.2 Feeding relationships

What is a food web?

What is a food chain?

Feeding relations

What examples are given of how wolves change the ecosystem?

How do wolves change rivers?

Symbiosis

SYMBIOSIS

A special relationship 

when two organisms 

from different species 

live together. 

For example: nemo is a (clown) fish and lives together with an anemone which is a cnidarian. 

<img src="https://i.pinimg.com/originals/c1/25/a0/c125a0828d8f794f84dc4affb9702797.jpg" alt="symbiosis types | Biología, Zoología, Actividades"/>

Symbiotic relationships:

- parasitism (+/-)

- mutualism (+/+)

- commensalism (+/o)

Dominance hierarchies 

• Some animals that live in groups have a dominance hierarchy.

The top ranked individual gets access to the resources without conflict.

• It reduces hostile behaviour in the group. 

For example in: baboons, wolves, chickens

Assign a food web- 4 minutes 

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

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?

WHAT TYPES OF SYMBIOSIS IS THIS?

1. MUTUALISM
2. COMMENSALISM
3. PARASITISM

WHAT TYPES OF SYMBIOSIS IS THIS?

1. MUTUALISM
2. COMMENSALISM
3. PARASITISM

WHAT TYPES OF RELATIONSHIP IS THIS?

1. PREDATION
2. COMPETITION
3. SYMBIOSIS

WHAT TYPES OF SYMBIOSIS IS THIS?

1. MUTUALISM
2. COMMENSALISM
3. PARASITISM

Homework

6.3