A food chain shows how each living thing gets its food.
Some animals eat plants and some animals eat other animals. For
example, a simple food chain links the trees & shrubs, the
giraffes (that eat trees & shrubs), and the lions (that eat the
giraffes). Each link in this chain is food for the next link. A
food chain always starts with plant life and ends with an animal.
A food web is a graphical description of feeding relationships among species in an ecological community that is, of who eats whom.
It is also a means of showing how energy and materials (e.g., carbon) flow through a community of species as a result of these feeding relationships. Typically, species are
connected by lines or arrows called "links", and the species are
sometimes referred to as "nodes" in food web diagrams.
A food web aims to depict a more complete picture of the feeding
relationships, and can be considered a bundle of many interconnected
food chains occurring within the community. All species occupying the
same position within a food chain comprise a trophic level within the
food web. For instance, all of the plants in the foodweb comprise the
first or "primary producer" tropic level, all herbivores comprise the second or "primary consumer" trophic level, and carnivores that eat herbiviores
comprise the third or "secondary consumer" trophic level. Additional
levels, in which carnivores eat other carnivores, comprise a tertiary
trophic level.
Tidak ada komentar:
Posting Komentar