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The number of studies on marine biological diversity is increasing rapidly. One of the primary goals of such studies is to estimate how many species occur in a given area. Both parametric and non-parametric methods have been developed to make such estimates. Here, we examine 2 categories of methods: one proposed by Chao (1984) Scand J Statist 11:265-270 and one by Kara- kassis (1995) Mar Ecol Prog Ser 120:299-303. Foggo et al. (2003) Mar Ecol Prog Ser 248:15-26 recently compared these methods. By examining the bases for the methods, we show that both give large underestimates of the likely number of species in a given area, and an alternative solution is suggested.

Estimation of species richness: analysis of the methods developed by Chao and Karakassis