The Ricker recruitment function

The Ricker recruitment function is widely used in population biology. Many years ago, Bob Costantino indicated in conversation to me that he thought the original ideas came from R. N. Chapman, an insect ecolo-gist, who argued much in the same way that I did concerning the form of the recruitment function. Citation to Chapman's work (one example is Chapman (1928)) can be found in Costantino and Desharnais (1991), which itself is a rich and informative volume on flour beetles (Tnbolium spp.). An obituary of Ricker (Beamish 2002), who died in 2001 at age 93, noted that he began as an entomologist and that it was only on a postdoctoral tour of Europe that he became professionally interested in fish population dynamics.

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