Food Web
A food web shows what each species eats and who is eaten. For e.g. in the food web the tiger shark and saltwater crocodile are at the top of the food web, whereas, the coral and seagrass are at the bottom. The arrows of the foodweb shows the direction energy flows in the web. The file below shows a simple food web in a reef community. It is, of course much more complex than this but this food web gives the general idea.