Primary students resource

1. Lake ecosystem
http://carrier.pbworks.com/w/page/15282827/Population-Ecology-Bio-2
Intro video:
http://www.youtube.com/watch?v=QlfVWFvsSkg&feature=results_video&playn
ext=1&list=PL4F12F8C6C27752D9
Biodiversity song:
http://www.youtube.com/watch?v=l_RH1PscC40&feature=related
http://www.youtube.com/watch?v=-Kjx7msPhAo&feature=related

2. What are they?
 Zooplankton
 Phytoplankton
Zooplancton, Fitoplancton

3. The sun
 The sun is the supplier of all life. The beginning
of any food chain, it provides the energy
needed for basic food sources to grow.
 In the case of a lake, phytoplankton (composed
mainly of algae) is the basic food source.
 Phytoplankton is a photo-synthesizer,
requiring adequate sunlight and heat to grow.
life
chain
energy
sources
algae
food
grow heat
sun

4. o In the lake ecosystem, phytoplankton is
referred to as a producer.
oIt needs sunlight, inorganic ingredients such as
phosphorous and nitrogen to prosper.
oA healthy ecosystem requires just the right
amount of phytoplankton: Too little and there is
not enough food for all. Too much and there is
not enough light.

5. Zooplankton are the animal
portion of the free-floating, living
particles in water.
As primary consumers, they eat
bacteria, algae, detritus and
sometimes other zooplankton.

6. Secondary Consumers
 Secondary consumers, such as
planktivorous fish or predaceous
invertebrates, eat zooplankton.
 Secondary consumers include
benthic (bottom-dwelling)
organisms like invertebrates and
bottom-feeding fish.
 Small fish, such as sunfish and
perch, eat primarily zooplankton,
putting them in this category of
feeders as well.
consumers, category, eat
http://www.youtube.com/watch?v=lxLdwOQ3i74

7. Tertiary Consumers
 Tertiary consumers
include larger fish and
other carnivorous
animals (loons, herons,
and otters).
 They prey on small fish.
Depending on the size
and location of the lake,
you find different
species.

8. Decomposers, which include bacteria, fungi, and
other microorganisms, are the other end of the
food chain.
They feed on the remains of all aquatic organisms,
breaking down or decaying organic matter.
Once it has been returned to its inorganic state in
this way, it is readily available for new plant
growth, and the cycle of life continues.
once, available,organic,
include, chain, cycle

9. Definitions explained in:
http://carrier.pbworks.com/w/page/15282827/Population-Ecology-Bio-2

10. Go to this website to explore this
topic
http://www.sheppardsoftware.com/c
ontent/animals/kidscorner/foodcha
in/producersconsumers.htm