Read Ebook: A Distributional Study of the Amphibians of the Isthmus of Tehuantepec México by Duellman William Edward

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Tadpoles were found in a small sluggish tributary to the R?o Sarabia.

As in most other places in M?xico and northern Central America, this species occurs wherever there is permanent water. Males were heard calling from woodland ponds and from savanna ponds.

SUMMARY

Investigations of the amphibians and their environments in the Isthmus of Tehuantepec have been presented with the aim of gaining an understanding of the present biological and of the historical events responsible for the present patterns of distribution of amphibians in this region.

The Isthmus of Tehuantepec embraces three major environments--savanna, semi-arid scrub forest, and quasi-rainforest. The rainforest presents an environment noticeably different from the other two and has a different amphibian fauna.

Analysis of present patterns of distribution shows that certain species are restricted to the rainforests on the Gulf lowlands; others live only in the semi-arid scrub forests on the Pacific lowlands. A third group of species lives on both the Gulf and Pacific lowlands; most of these species occur only in the scrub forests or savannas on the Gulf lowlands, but some also inhabit the rainforest. In one way or another the isthmus presents a barrier to the distribution of 75 per cent of the species of amphibians living in the lowlands; it is a greater barrier still to the species inhabiting the highlands on either side.

Present patterns of distribution are attributed to bioclimatic fluctuation in the Pleistocene. In the course of these climatic shifts, tropical environments and their amphibian inhabitants seem to have survived in the isthmian region.

LITERATURE CITED

BEARD, J. S.

BOULENGER, G. A.

BURT, C. E.

CONTRERAS A., A.

COOKE, C. W.

DORF, E.

DUELLMAN, W. E.

DUELLMAN, W. E., and SCHWARTZ, A.

DUNN, E. R.

FUGLER, C. M., and WEBB, R. G.

GLOYD, H. K.

GOIN, C. J.

GOLDMAN, E. A.

GOODNIGHT, C. J., and GOODNIGHT, M. L.

GRISCOM, L.

HARTWEG, N., and OLIVER, J. A.

HUBBELL, T. H.

HUTCHINSON, G. E., PATRICK, R., and DEEVEY, E. S.

LANGEBARTEL, D. A., and SMITH, P. W.

MARTIN, P. S.

MARTIN, P. S., and HARRELL, B. E.

OLIVER, J. A.

OLSON, E. C., and MCGREW, P. O.

RUTHVEN, A. G.

SCHUCHERT, C.

SEARS, P. B., FOREMAN, F., and CLISBY, K. H.

SHANNON, F. A., and WERLER, J.

SHREVE, B.

SMITH, H. M.

SMITH, H. M., and LAUFE, L. E.

SMITH, H. M., and TAYLOR, E. H.

STIRTON, R. A.

STUART, L. C.

TAYLOR, E. H.

TAYLOR, E. H., and SMITH, H. M.

TRASK, P. D., PHLEGER, F. B., and STETSON, H. C.

WEYL, R.

WHITE, S. E.

WILLIAMS, L.

UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY

Institutional libraries interested in publications exchange may obtain this series by addressing the Exchange Librarian, University of Kansas Library, Lawrence, Kansas. Copies for individuals, persons working in a particular field of study, may be obtained by addressing instead the Museum of Natural History, University of Kansas, Lawrence, Kansas. There is no provision for sale of this series by the University Library, which meets institutional requests, or by the Museum of Natural History, which meets the requests of individuals. However, when individuals request copies from the Museum, 25 cents should be included, for each separate number that is 100 pages or more in length, for the purpose of defraying the costs of wrapping and mailing.

Vol. 1. Nos. 1-26 and index. Pp. 1-638, 1946-1950.

Index. Pp. 651-681.

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