For example, within the mangrove swamps of Queensland, Australia, there are over 50 different species,some of which are found 111 other parts of the world, others of which are unique to that region. To the untrained eye the plants within a mangrove swamp may look monotonously similar, but on close examination there are big variations in leaf shape, the type of fruit and the methods of seed dispersal. The biggest variations between mangroves, however, are to be found in their root systems and this is a response to where they grow in relation to local drainage and tidal conditions.There are three basic types of mangrove root systems, although some plants are variations from this scheme and have a combination of two root types.