On the species problem the interests of genetics, taxonomy, and ecology converge to a remarkable extent, and it seems that only through coordinatn of the methods of these several disciplines can satisfactory progress in this field be made. Where closely-related species, or populatns very nearly attaining the rank of species, are involved, the problem attains a maximum of complexity; it is just such cases, however, which appear most amenable to intensive investigatn. The present article reports the results of an attempt to analyze the situatn in a group of species of toads inhabiting the eastern United States. MATERIAL AND TECHNIQUE The collecting of approximately 4300 adult and 10,000 immature toads and tadpoles involved field work in Manitoba, North Dakota, South Dakota, Minnesota, wa, Missouri, Kansas, Oklahoma, Arkansas, Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina, North Carolina, Tennessee, Kentucky, Indiana, and Illinois. In additn 660 toads from three other sources were examined: (I) the University of Michigan Museum of Zoology, ( 2 ) other workers in Michigan, Pennsylvania, New York, Georgia, Arkansas, and Oklahoma, and (3) blogical supply dealers in Wisconsin and North Carolina. In all, about 5000 adult toads from 39 states were critically examined and measured for
Genetics – Genetics Society of America
Published: Jul 1, 1941
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