This is a diagram of a food web. Almost all animals must eat other organisms to obtain energy. Animals do not generally eat just one thing, nor are they eaten by only one thing. This means that each organism, through feeding, is interconnected to many different organisms. A food web shows how all species in a community are connected.
Let’s think about the organisms in an environment. If any one species is disturbed, then all species will undergo changes in its population. Eg. If small fish numbers go down then snail and cockle numbers will go up. Big fish and seabird numbers will go down.
An animal can be both a predator and a prey. For example, a small fish may eat certain types of snails, but he may also be eaten by a duck. So the small fish is both predator and prey in this food web..
Almost all animals must eat other organisms to obtain energy. Animals do not generally eat just one thing, nor are they eaten by only one thing. This means that each organism, through feeding, is interconnected to many different organisms. A food web shows how all species in a community are connected.
We, humans, often upset the balance of different populations in natural ecosystems, or change the environment so that some species find it difficult to survive. We reduce the amount of land available for animals and plants by: building; quarrying; farming; dumping waste.
Our activities may pollute: water ‐ with sewage, fertiliser or toxic chemicals; air ‐ with smoke and gases such as sulfur dioxide; land ‐ with toxic chemicals, such as pesticides and herbicides, which may be washed from land into water.