A Quantitative Approach to the Study of Non-indigenous Plants: An Example from the Azores Archipelago

  title={A Quantitative Approach to the Study of Non-indigenous Plants: An Example from the Azores Archipelago},
  author={Lu{\'i}s Silva and Clifford W. Smith},
  journal={Biodiversity \& Conservation},
A random survey of non-indigenous plants was performed on the nine islands of the Azores Archipelago, including 529 one square km plots, corresponding to about 20% of the land surface. The number of sampling plots varied from 12 for Corvo Island to 136 for São Miguel, while the number of sampled taxa per island varied between 152 and 365. The percentage of non-indigenous taxa was lowest for Corvo, Flores, and São Jorge (below 60%), and highest for Graciosa (above 70%), with intermediate values… 

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