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| 1 | Testing the potential mechanisms for the maintenance of a genetic color polymorphism in bluefin killifish populations显示文摘The maintenance of genetic variation in the face of natural selection is a long-standing question in evolutionary biology.In the bluefin killifish Lucania goodei,male coloration is polymorphic.Males can produce either red or yellow coloration in their anal fins,and both color morphs are present in all springs.These 2 morphs are heritable and how they are maintained in nature is unknown.Here, we tested 2 mechanisms for the maintenance of the red/yellow color morphs.Negative frequency-dependent mating success predicts that rare males have a mating advantage over common males. Spatial variation in fitness predicts that different color morphs have an advantage in different microhabitat types.Using a breeding experiment,we tested these hypotheses by creating populations with different ratios of red to yellow males (5 red:1 yellow;1 red:5 yellow)and determining male mating success on shallow and deep spawning substrates.We found no evidence of negative frequency-dependent mating success.Common morphs tended to have higher mating success, and this was particularly so on shallow spawning substrates.However,on deep substrates,red males enjoyed higher mating success than yellow males,particularly so when red males were rare. However,yellow males did not have an advantage at either depth nor when rare.We suggest that preference for red males is expressed in deeper water,possibly due to alterations in the lighting environment.Finally,male pigment levels were correlated with one another and predicted male mating success.Hence,pigmentation plays an important role in male mating success. | Ashley M.JOHNSON Chia-Hao CHANG Rebecca C.FULLER | 2018 | Current Zoology2018，64，6： | 1 |
| 2 | Toward a low-carbon economy显示文摘 | Merrrian C.Fuller Stephen Compagni Portis Daniel M.Kammen | | 0，，01： | 1 |
| 3 | Asymmetric reinforcement in Lucania killifish:assessing reproductive isolation when both sexes choose显示文摘Reinforcement can occur when maladaptive hybridization in sympatry favors the evolution of con-specific preferences and target traits that promote behav ioral isolation(BI).In many systems,enhanced BI is due to increased female preference for conspecifics.In others,BI is driven by male preference,and in other systems both sexes exert preferences.Some of these patterns can be atributed to classic sex-specific costs and benefits of preference.Alternatively,sex differences in conspecific preference can emerge due to asymmetric postzygotic isolation(e.g.,hybrid offspring from female A × male B have lower fitness than hybrid offspring from female B × male A),which can lead to asymmetric BI(e.g.,female A and male B are less likely to mate than female B and male A).Understanding reinforcement requires understanding how conspecific preferences evolve in sympatry.Yet,estimating conspecific preferences can be difficult when both sexes are choosy.In this study,we use Lucania killifish to test the hypothesis that patterns of reinforcement are driven by asymmetric postzygotic isolation between species.If true,we predicted that sympatric female Lucania goodei and sympatric male L.parva should have lower levels of BI compared with their sympatric counterparts,as they produce hybrid offspring with the highest fitness.To address the problem of measuring BI when both sexes are choosy,we inferred the contribution to BI of each partner using assays where one sex in the mating pair comes from an allopatric population with potentially low preference,whereas the other comes from a sympatric population with high prefer-ence.For one hybrid cross direction,we found that both female L.parva and male L.goodei have high contributions to BI in sympatry.In the other hybrid cross direction,we found that only female L.goodei contribute to BI.Sympatric male L.parva readily engaged in hybrid spawnings with allo-patric L.goodei females.These results indicate that both asymmetric postzygotic isolation and the traditional sex-specific costs to preference likely affect the nature of selection on conspecific prefer-ences and target traits. | Michelle E.ST.JOHN Rebecca C.FULLER | 2021 | Current Zoology2021，67，2： | 0 |
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