Artificial selection, naturalization, and fitness: Darwin's pigeons revisited

Artificial grammar learning in pigeons.

In two experiments, we developed a new methodology for studying complex stimulus control by spatial sequences of letters generated by artificial grammars. An artificial grammar is a system of rules that defines which letter sequences or strings are "grammatical." In Experiment 1, pigeons learned to respond differently to strings conforming to a grammar versus strings that were nongrammatical di...

Fitness consequences of artificial selection on relative male genital size

Male genitalia often show remarkable differences among related species in size, shape and complexity. Across poeciliid fishes, the elongated fin (gonopodium) that males use to inseminate females ranges from 18 to 53% of body length. Relative genital size therefore varies greatly among species. In contrast, there is often tight within-species allometric scaling, which suggests strong selection a...

Artificial Selection on a Fitness-component in Drosophila Melanogaster.

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Artificial Insemination of Pigeons and Doves

Since the development by Quinn and Burrows (1936) of a simple method of obtaining semen from and inseminating gallinaceous (chicken-like) birds, artificial insemination has made possible a number of studies on the physiology of reproduction and hybridization of these birds. An extension of the technique to the smaller birds, particularly to the pigeons and doves, holds promise as a tool for mor...

"Naturalization" and Naturalization Law: Some Empirical Observations