Faculty Opinions recommendation of Tempo of hybrid inviability in centrarchid fishes (Teleostei: Centrarchidae).

Crosses between populations or species often display an asymmetry in the fitness of reciprocal F 1 hybrids. This pattern, referred to as isolation asymmetry or Darwin's Corollary to Haldane's Rule, has been observed in taxa from plants to vertebrates, yet we still know little about which factors determine its magnitude and direction. Here, we show that differences in offspring size predict the direction of isolation asymmetry observed in crosses between populations of a placental fish, Heterandria formosa . In crosses between populations with differences in offspring size, high rates of hybrid inviability occur only when the mother is from a population characterized by small offspring. Crosses between populations that display similarly sized offspring, whether large or small, do not result in high levels of hybrid inviability in either direction. We suggest this asymmetric pattern of reproductive isolation is due to a disruption of parent–offspring coadaptation that emerges from selection for differently sized offspring in different populations.

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Ecomorphology of Centrarchid Fishes

Centrarchid Fishes ◽

10.1002/9781444316032.ch3 ◽

2009 ◽

pp. 70-89 ◽

Cited By ~ 12

Author(s):

D. C. Collar ◽

P. C. Wainwright

Keyword(s):

Centrarchid Fishes

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A NOTE ON HALDANE'S RULE: HYBRID INVIABILITY VERSUS HYBRID STERILITY

Evolution ◽

10.1111/j.1558-5646.1992.tb01152.x ◽

1992 ◽

Vol 46 (5) ◽

pp. 1584-1587 ◽

Cited By ~ 21

Author(s):

Chung-I Wu

Keyword(s):

Hybrid Sterility ◽

Hybrid Inviability ◽

Haldane’S Rule ◽

Haldane's Rule

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Accelerated Mitochondrial Evolution and “Darwin's Corollary”: Asymmetric Viability of Reciprocal F1 Hybrids in Centrarchid Fishes

Genetics ◽

10.1534/genetics.107.081364 ◽

2008 ◽

Vol 178 (2) ◽

pp. 1037-1048 ◽

Cited By ~ 76

Author(s):

Daniel I. Bolnick ◽

Michael Turelli ◽

Hernán López-Fernández ◽

Peter C. Wainwright ◽

Thomas J. Near

Keyword(s):

F1 Hybrids ◽

Mitochondrial Evolution ◽

Centrarchid Fishes

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Assessment of natural interspecific hybridization of blue and Engelmann spruce in southwestern Colorado

Canadian Journal of Botany ◽

10.1139/b90-189 ◽

1990 ◽

Vol 68 (7) ◽

pp. 1489-1496 ◽

Cited By ~ 3

Author(s):

S. G. Ernst ◽

J. W. Hanover ◽

D. E. Keathley

Keyword(s):

Female Parent ◽

Isozyme Analysis ◽

Interspecific Crosses ◽

Hybrid Inviability ◽

Engelmann Spruce ◽

Diallel Mating Design ◽

Close Proximity ◽

Gametic Selection ◽

Total Seed ◽

Pollen Shed

In a partial diallel mating design among 20 blue and 20 Engelmann spruce parents, the interspecific crosses were successful only with Engelmann spruce as the female parent. No viable seed were obtained from the reciprocal cross among the 60 full-sib families attempted. Under the conditions of artificial pollination and a controlled germination environment, an average of 0.3% of the seed germinated on a total seed basis across all 20 Engelmann spruce females. Many abnormalities were observed among the germinating hybrid seed, suggesting hybrid inviability also contributes to the low crossability between these two species. Isozyme analysis was used to confirm the interspecific hybrids between blue and Engelmann spruce based on the unique genotypic compositions of the hybrids relative to the two species. No natural F1 hybrids between blue and Engelmann spruce were observed in this study based on isozyme analysis of mature individuals or their seedling progeny. Analyses included samples of open-pollinated seed from blue and Engelmann spruce females located in an area where both species are present in close proximity, often side-by-side, and where pollen shed and female strobilus receptivity in the two species are coincident. In addition, there was evidence of possible gametic selection or hybrid inviability among the full-sib progeny based on deviations of observed from expected segregation ratios for progeny isozyme genotypes. Deviations tended to favor the allele more common to both species rather than the allele unique or more common to only one species. Also, the elevationally allopatric blue and Engelmann spruce subpopulations were less divergent genetically than the sympatric subpopulations.

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