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Table 1.

Sex ratio, and frequency of melanic male progeny from Gambusia holbrooki virgin female × melanic male matings

Number (male:female)Sex-ratio (male:female)Male morph (melanic:silver)Frequency melanic males
Ntotal (number of broods)
Population@31°C@18°C
Newport Springs 98:69 1.4:1*,a 4:1 0.81 0.00 167 (24) 
Picnic Pond (PP) 111:113 0.98:1 2.6:1 0.00 0.72 224 (30) 
Miami 134:53 2.5:1*,b 4:1 0.81 0.00 187 (20) 
PP female × Miami male 321:167 1.9:1*,c 4:1† 0.81 0.00 488 (35) 
Miami female × PP male 76:66 1.1:1 2:1 0.02 0.68 132 (18) 
Number (male:female)Sex-ratio (male:female)Male morph (melanic:silver)Frequency melanic males
Ntotal (number of broods)
Population@31°C@18°C
Newport Springs 98:69 1.4:1*,a 4:1 0.81 0.00 167 (24) 
Picnic Pond (PP) 111:113 0.98:1 2.6:1 0.00 0.72 224 (30) 
Miami 134:53 2.5:1*,b 4:1 0.81 0.00 187 (20) 
PP female × Miami male 321:167 1.9:1*,c 4:1† 0.81 0.00 488 (35) 
Miami female × PP male 76:66 1.1:1 2:1 0.02 0.68 132 (18) 

*,a,b,cSignificantly different from 1:1 (a: ϰ20.05,1=5.04, 0.025<P<0.01; b: ϰ20.05,1=35.08, P<0.001; c: ϰ2 0.05,1=48.60, P<0.001).

Progeny were raised until maturity in a hot (31°C) environment, then if silver, transferred to a cold (18°C) environment to monitor temperature-sensitive melanic expression.

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