Hybrid dysfunction in fire-bellied toads (Bombina)

L. Kruuk, J. Gilchrist, N.H. Barton, Evolution; International Journal of Organic Evolution 53 (1999) 1611–1616.

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Abstract
Reproductive isolation between two taxa may be due to endogenous selection, which is generated by incompatibilities between the respective genomes, to exogenous selection, which is generated by differential adaptations to alternative environments, or to both. The continuing debate over the relative importance of either mode of selection has highlighted the need for unambiguous data on the fitness of hybrid genotypes. The hybrid zone between the fire-bellied toad (Bombina bombina) and the yellow-bellied toad (B. variegata) in central Europe involves adaptation to different environments, but evidence of hybrid dysfunction is equivocal. In this study, we followed the development under laboratory conditions of naturally laid eggs collected from a transect across the Bombina hybrid zone in Croatia. Fitness was significantly reduced in hybrid populations: Egg batches from the center of the hybrid zone showed significantly higher embryonic and larval mortality and higher frequencies of morphological abnormalities relative to either parental type. Overall mortality from day of egg collection to three weeks after hatching reached 20% in central hybrid populations, compared to 2% in pure populations. There was no significant difference in fitness between two parental types. Within hybrid populations, there was considerable variation in fitness, with some genotypes showing no evidence of reduced viability. We discuss the implications of these findings for our understanding of barriers to gene flow between species.
Publishing Year
Date Published
1999-10-01
Journal Title
Evolution; International Journal of Organic Evolution
Volume
53
Issue
5
Page
1611 - 1616
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Kruuk L, Gilchrist J, Barton NH. Hybrid dysfunction in fire-bellied toads (Bombina). Evolution; International Journal of Organic Evolution. 1999;53(5):1611-1616. doi:10.2307/2640907
Kruuk, L., Gilchrist, J., & Barton, N. H. (1999). Hybrid dysfunction in fire-bellied toads (Bombina). Evolution; International Journal of Organic Evolution, 53(5), 1611–1616. https://doi.org/10.2307/2640907
Kruuk, Loeske, Jason Gilchrist, and Nicholas H Barton. “Hybrid Dysfunction in Fire-Bellied Toads (Bombina).” Evolution; International Journal of Organic Evolution 53, no. 5 (1999): 1611–16. https://doi.org/10.2307/2640907.
L. Kruuk, J. Gilchrist, and N. H. Barton, “Hybrid dysfunction in fire-bellied toads (Bombina),” Evolution; International Journal of Organic Evolution, vol. 53, no. 5, pp. 1611–1616, 1999.
Kruuk L, Gilchrist J, Barton NH. 1999. Hybrid dysfunction in fire-bellied toads (Bombina). Evolution; International Journal of Organic Evolution. 53(5), 1611–1616.
Kruuk, Loeske, et al. “Hybrid Dysfunction in Fire-Bellied Toads (Bombina).” Evolution; International Journal of Organic Evolution, vol. 53, no. 5, Wiley-Blackwell, 1999, pp. 1611–16, doi:10.2307/2640907.

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