How many species?. May, R., M. & Anonymous Philosophical Transactions - Royal Society of London, B, 330(1257):293-304, 1990.
How many species? [link]Website  abstract   bibtex   
Outlines approaches to estimating what the total number of species on Earth might be, eg extrapolation of past trends; direct assessments based on the overall fraction previously recorded among newly studied groups of tropical insects; indirect assessment derived from recent studies of arthropods in the canopies of tropical trees (giving attention to the question of what fraction of the species found on a given host-tree are likely to be "effectively specialized' on it); and estimates inferred from theoretical and empirical patterns in species-size relations or in food web structure. There is a discussion by R.J.H. Beverton. -from Author
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 title = {How many species?},
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 year = {1990},
 pages = {293-304},
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 abstract = {Outlines approaches to estimating what the total number of species on Earth might be, eg extrapolation of past trends; direct assessments based on the overall fraction previously recorded among newly studied groups of tropical insects; indirect assessment derived from recent studies of arthropods in the canopies of tropical trees (giving attention to the question of what fraction of the species found on a given host-tree are likely to be "effectively specialized' on it); and estimates inferred from theoretical and empirical patterns in species-size relations or in food web structure. There is a discussion by R.J.H. Beverton. -from Author},
 bibtype = {article},
 author = {May, R M and Anonymous, undefined},
 journal = {Philosophical Transactions - Royal Society of London, B},
 number = {1257}
}
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