Correlated morphological and allozyme variation in the hybridizing toads Bufo americanus and Bufo hemiophrys

Herpetologica

Volumn 53, Issue 2, 1997, Pages 218-228

  Green, David M ^a   Pustowka, Cory ^a,b  

^a MCGILL UNIVERSITY   (Canada)

^b UNIVERSITY OF PRINCE EDWARD ISLAND   (Canada)

Author keywords

Allozymes; Amphibians; Bufo; Cline; Hybrid zone; Manitoba; Morphometrics; Species boundaries; Toads

Indexed keywords

EID: 0000718210     PISSN: 00180831     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (37)

1. ARNOLD, M. L. 1992. Natural hybridization as an evolutionary process. Ann. Rev. Ecol. Syst. 23:237-261.
2. BARTON, N. H., AND K. S. GALE. 1993. Genetic analysis of hybrid zones. Pp. 13-45. In R. Harrison (Ed.), Hybrid Zones and the Evolutionary Process. Oxford University Press, New York, New York.
3. BARTON, N. H., AND G. M. HEWITT. 1985. Analysis of hybrid zones. Ann. Rev. Ecol. Syst. 16:113-148.
4. _. 1989. Adaptation, speciation and hybrid zones. Nature 341:497-503.
5. BLAIR, W. F. (Ed.) 1972. Evolution in the Genus Bufo. University of Texas Press, Austin, Texas.
6. COLLINS, J. T. 1991. Viewpoint: A new taxonomic arrangement for some North American amphibians and reptiles. Herpetol. Rev. 22:42-43.
7. CONANT, R., AND J. T. COLLINS. 1991. A Field Guide to Reptiles and Amphibians of Eastern and Central North America, 3rd ed. Houghton Mifflin, Boston, Massachusetts.
8. COOK, F. R. 1983. An analysis of toads of the Bufo americanus group in a contact zone in central northern North America. Natl. Mus. Canada. Publ. Nat. Sci. 3:1-89.
9. DALY, J. C., P. WILKINSON, AND D. D. SHAW. 1981. Reproductive isolation in relation to allozyme and chromosomal differentiation in the grasshopper Caledia captiva. Evolution 35:1164-1179.
10. DOBZHANSKY, T. 1970 Genetics of the Evolutionary Process. Columbia University Press, New York, New York
11. ENDLER, J. A. 1977. Geographic Variation, Speciation and Clines. Princeton University Press, Princeton, New Jersey.
12. FROST, D. R., AND D. M. HILLIS. 1990. Species in concept and practise: Herpetological applications. Herpetologica 46.87-104.
13. GREEN, D. M. 1981. Theoretical Analysis of Hybrid Zones Derived from an Examination of Two Dissimilar Zones of Hybridization in Toads (Genus Bufo). Ph.D. Thesis, University of Guelph, Guelph, Ontario, Canada.
14. _. 1983. Allozyme variation through a clinal hybrid zone between the toads Bufo americanus and B. hemiophrys in southeastern Manitoba. Herpetologica 39:28-40.
15. _ 1984. Sympatric hybridization and allozyme variation in the toads Bufo americanus and B. fowleri in southern Ontario. Copeia 1984:18-26.
16. _. 1992. Fowler's toads, Bufo woodhousii fowleri, at Long Point, Ontario: changing abundance and implications for conservation. Pp. 37-45. In C. A. Bishop and K. E. Pettit (Eds.), Declines in Canadian Amphibian Populations. Designing a National Monitoring Strategy. Canadian Wildl. Serv. Occ. Publ. 76, Environment Canada, Ottawa, Ontario, Canada.
17. _. 1996. The bounds of species. Hybridization in the Bufo americanus group of North American toads. Israel J. Zool 42:95-109.
18. GUTTMAN, S. I. 1975. Genetic variation in the genus Bufo II Isozymes in northern allopatric populations of the American toad, Bufo americanus. Pp. 679-697. In C. C. Markert (Ed.), Isozymes IV: Genetics and Evolution. Academic Press, New York, New York.
19. GUTTMAN, S. I., AND K. G. WILSON. 1973. Genetic variation in the genus Bufo I. An extreme degree of transferrin and albumin polymorphism in a population of the American toad (Bufo americanus). Biochem. Genet. 8:329-340.
20. HARRISON, R. G. 1990 Hybrid zones: Windows on evolutionary process. Oxford Surv. Evol. Biol. 7:69-128.
21. _. 1993. Hybrids and hybrid zones: Historical perspective. Pp. 3-12. In R. G. Harrison (Ed.), Hybrid Zones and the Evolutionary Process. Oxford University Press, New York, New York.
22. HENRICH, T. W. 1968. Morphological evidence of secondary intergradation between Bufo hemiophrys Cope and Bufo americanus Holbrook in eastern South Dakota. Herpetologica 24:1-13.
23. HEWITT, G. M 1989. The subdivision of species by hybrid zones. Pp. 85-110. In D. Otte and J. A. Endler (Eds.), Speciation and Its Consequences. Sinauer Associates, Sunderland, Massachusetts.
24. _ 1993. Postglacial distribution and species substructure: Lessons from pollen, insects and hybrid zones. Pp. 97-123. In D. R. Lees and D. Edwards (Eds.), Evolutionary Patterns and Processes. Academic Press, San Diego, California.
25. HOWARD, D. J. 1993. Reinforcement: Origin, dynamics, and fate of an evolutionary hypothesis. Pp. 46-69. In R G Harrison (Ed.), Hybrid Zones and the Evolutionary Process. Oxford University Press, New York, New York.
26. KOHLMANN, B., H. NIX, AND D. D. SHAW. 1988. Environmental predictions and distributional limits of chromosomal taxa in the Australian grasshopper Caledia captiva (F.). Oecologia (Berlin) 75:483-93.
27. LEE, J. C. 1982. Accuracy and precision in anuran morphometrics: Artifacts of preservation. Syst. Zool. 31:266-281.
28. MEACHAM, W. R. 1962. Factors affecting secondary intergradation between two allopatric populations in the Bufo woodhousei complex. Am. Midl. Nat. 67:282-304.
29. MOORE W S., AND D. B. BUCHANAN. 1985. Stability of the northern flicker hybrid zone in historical times: implications for adaptive speciation theory. Evolution 39:135-151.
30. MURPHY, R. W., J. W. SITES, D. G. BUTH, AND C. H. HAUFLER. 1990. Proteins 1: Isozyme electrophoresis. Pp. 45-126. In D. M. Hillis and C. Moritz (Eds), Molecular Systematics. Sinauer Associates, Sunderland, Massachusetts.
31. PECHMANN, J. H. K., D. E. SCOTT, R. D. SEMLITSCH, J. P. CALDWELL, L. J. VITT, AND J. W. GIBBONS. 1991. Declining amphibian populations: The problem of separating human impacts from natural fluctuations. Science 253:892-895.
32. REMINGTON, C. L. 1968. Suture zones of hybrid interaction between recently joined biotas. Evol. Biol. 2:321-428.
33. SAGE, R. D., AND R. K. SELANDER 1979. Hybridization between species of the Rana pipiens complex in central Texas. Evolution 33.1069-1088.
34. SZYMURA, J. M. 1993. Analysis of hybrid zones in Bombina. Pp. 261-289. In R. Harrison (Ed.), Hybrid Zones and the Evolutionary Process. Oxford University Press, New York, New York.
35. SZYMURA, J. M., AND N. H. BARTON. 1991. The genetic structure of the hybrid zone between the fire-bellied toads, Bombina bombina and B. variegata: Comparisons between transects and between loci. Evolution 45:237-161.
36. WAKE, D. B., S. H. YANG, AND T. H. PAPENFUSS. 1980. Natural hybridization and its evolutionary implications in Guatemalan plethodontid salamanders of the genus Bolitoglossa. Herpetologica 36: 335-345.
37. WRIGHT, A. H., AND A. A WRIGHT. 1949. Handbook of Frogs and Toads of the United States and Canada. Comstock Publishing Company, Ithaca, New York.