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First published online December 1, 2006
Journal of Experimental Biology 209, 4938-4945 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02599
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A sex-linked allele, autosomal modifiers and temperature-dependence appear to regulate melanism in male mosquitofish (Gambusia holbrooki)

Lisa Horth

Department of Biological Sciences, Old Dominion University, Norfolk, VA 23529, USA


Figure 1
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  		Fig. 1. Male eastern mosquitofish, Gambusia holbrooki. (A) Melanic male. (B) Silver male. (C) Magnification (50x) of melanic male dermis, showing melanin deposition in macromelanophores. (D) Magnification (50x) of silver male dermis, showing melanin deposition in micromelanophores.

 

Figure 2
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  		Fig. 2. Potential crosses and outcomes for a dominant, autosomal modifier of a Y-linked melanism gene in Gambusia holbrooki. Percentage refers to male fish from a given cross that would have a melanic phenotype. Mean at bottom refers to percentage melanism that would result if sires were heterozygous or homozygous dominant for the autosomal modifier and dams were used from all three diplid genotypes at equal frequency (it is assumed that males are not aa, otherwise they would not be melanic).

 

Figure 3
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  		Fig. 3. Number of silver and melanic male progeny per brood for 24 Newport Springs melanic male x virgin female matings.

 

Figure 4
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  		Fig. 4. Number of silver and melanic male progeny per brood for 20 Miami melanic male x virgin female matings.

 

Figure 5
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  		Fig. 5. Number of silver and melanic male progeny per brood for 35 Miami melanic male x Picnic Pond virgin female matings.

 




© The Company of Biologists Ltd 2006