Food chains = also called foodwebs, foodnetworks or trophic networks. They discribe the feeding relationships between one species and another within an ecosystem. A food chain always starts with plant life (that only needs mineral matter to feed on and ends with an animal).
Description : the grass snake is dark green
or brown, with a yellow collar behind its head.
Diet : it mainly eats amphibians, like the
frog, mammals and fish from time to time.
Characteristics : they are strong swimmers. They hibernate
over the winter and mate soon after they emerge in the spring in April
or May. They are not venomous.
The Green Frog
Scientific name : Rana esculenta
Size : 4 to 12 centimetres
Longevity : 6 to 10 years
Description : It has a squat body, a round
nose, horizontal pupils. Two lines of glands stand out on the back.
In general the top of the body is light green and the bottom is yellow
for the male.
Food : Arthropods, insects, little shellfish,
larvae of amphibians and worms.
Characteristic :It lives in lakes, ponds,in wet meadows
and the forests. The female lays between 1500 and 4000 eggs. At the
end of 3 to 4 weeks tadpoles are born.
The grey heron
Scientific name :ardea cinerea
:Size : It is 95 cms tall and mesure
from 1.6 to 2 kg.
Longevity : 25 years
Description : It is a migratory bird.We can find
it in the west of Europe, in the south of Africa, and in the south
east of Asia.In the winter we can find it hot countries like Spain,Italy,Central
Africa.The grey heron lives on the water plans.
Diet : Fish, birds, shellfish, molluscs, little
rodents, little mammals, plants, insects, batracians.
Characteristic : A long neck, a long and sharp beak.Its
plumage is large,white and grey.Its flight is slow because of its
folded neck.Its scream is a long "fraaaaank".
great diving beetle
Scientific name :Dytiscus marginalis.
Size : It can measure up 27 to 36 mm.
Longevity : It can live 3 to 4 years.
Description : It is a beetle of the family of
the "dytiscidae". It is brown or black and yellow.
Food : It eats small fish, tadpoles and insects.
Characteristics : It lives in fresh water with vegetation.
The great diving beetle is found in Europe, England and Asia.
Scientific Name :Lymnaea stagnalis.
Height : It is 60 mm long.
Description : Soft water snail .It hasn't got
capping. Its breathing is aerial : it has got lungs.It is a hermaphrodite:
it is a male animal and a female animal together. It lays eggs.
Food : It feeds on aquatic plants.
Feature: It lives on the soft water and it moves slowly but
surely.It absorbs some calcium which dissolves in the water to build
Description : the plant plankton or phytoplankton (from the Greek "phuton" meaning plant) is a small organism unable to swim against the current.
Food : the plant plankton is mainly found in the upper layers of the sea (0 to 15 cm deep),where it carries out its photosynthesis.This means it absorbs mineral salts and carbon dioxide and realeases oxygen under the action of light.
Characteristics : it lives in soft,brackish or salty water, mostly in suspension.
Description : the animal plankton, or zooplankton (from the greek "zoio" meaning animal)is a small organism unfit of fighting against the current.
Food : it feeds on living matter . Some species are herbivorous and others carnivorous.
Characteristics : like the phytoplankton,it lives in soft, brackish or salty water.It goes to the surface at night to feed on phytoplakton and goes back towards deeper waters in the daytime.
Scientific name : Gammarus Pulex (Freshwater
Size :The adult Gammarus Pulex measures
11 mm. The males are about 20 mm big.
Longevity :The cycle of the Gammarus Pulex is complex .
Description : Small rigid shell which covers the head and thorax.Two pairs of large antennas
on its head.Seven pairs of legs on the thorax , three pairs of legs on the abdomen.
Food :The gammarus Pulex eats litlle organic debris and plants.
Characteristics :They can be found especially in the rivers
behind stones and around plants. They breed fast and there are two
generations a year .
Scientific name : Rutilus rutilus
Size : It can mesure 15 to 30 cms.
Longevity : It can live 10 to 15 years.
Description : The roach has fins of orange
colour that vary,as the iris of our eye. It is covered with scales.
It breeds easily. Punter: 150000 - 200000 eggs.
Food : Small molluscs, grubs of insects, worms,
seaweed and surface insects.
Characteristics :This fish adapts very well to all plans
of water and lives well with other fresh water fish.
Scientific name :Esox Lucius
Size : It is 50 to 70 centimeteres tall.
Longevity : The male pike can live during
50 years and a female pike has a longevity of 30 years.
Description : The flank and the back of
the pike are yellowish or greenish. It weighs 2 to 5 kilograms. It
has got a dorsal fin, that makes it very fast. It has 700 sharp teeth
and 6 fins.
Food : The Pike eats frogs and sometimes
roaches, it is a powerful predator.
Characteristics : It has 5 sensory pores on its head.
It lives in lakes, pools, rivers and rocky waters.It hides in weeds.
Scientific name :Ephemeroptera
Size : It can measure up to 5 cms
Longevity : It can live up to3 years
Description : It has 6 legs: 2 small front
legs and 4 hind legs. It has 3 gills by which it breathes.
Food : It is carnivorous : it eats worms,
small fishes, and insects.
Characteristics :It lives in lakes, ponds, swamps and
peat bogs. It does not cross the stage of chrysalis. It is brown and
The larva of the chironome
Scientific name: chironomidae
Size : About 1 cm
of red colour living in the mud. It is the embryonic form of a mosquito
Food: Organic matter
present in the mud.
It proliferates in the polluted rivers where organic matter a abundant.
Scientific name :Rana
Size: 2 to 4 cm
Description : It has a big head,
it breathes with internal and external gills.It doesn't have legs
but it has a swimming tail.
Diet : Many tadpoles are herbivorous,
they eat seaweed and plants.Several species become carnivorous if
the conditions are hard.
Charactéristics : During his cycle, it
tansforms into a frog.