How many species are there?
- Cite this article as:
- Stork, N.E. Biodivers Conserv (1993) 2: 215. doi:10.1007/BF00056669
‘How many species are there’ is a question receiving more attention from biologists and reasons for this are suggested. Different methods of answering this question are examined and include: counting all species; extrapolations from known faunas and regions; extrapolations from samples; methods using ecological models; censusing taxonomists' views. Most of these methods indicate that global totals of 5 to 15 million species are reasonable. The implications of much higher estimates of 30 million species or more are examined, particularly the question of where these millions of species might be found.