For example, many legumes (members of the pea family) were introduced to Ascension, legumes are well known for nitrogen fixation which arises as a result of an evolutionary relationship with the micro-organisms that are actually responsible for the nitrogen fixation.
For example, many legumes (members of the pea family) were introduced to Ascension for their beneficial nitrogen fixing properties resulting in a rise in available nitrogen in the soil. Legumes have a evolved a relationship with the micro-organisms that are responsible for the nitrogen fixation.