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HETEROZYGOSITY AND DEVELOPMENTAL RATE IN A STRAIN OF RAINBOW TROUT ( SALMO GAIRDNERI )
Author(s) -
Danzmann Roy G.,
Ferguson Moira M.,
Allendorf Fred W.,
Knudsen Kathy L.
Publication year - 1986
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1986.tb05720.x
Subject(s) - biology , rainbow trout , salmo , loss of heterozygosity , heterozygote advantage , locus (genetics) , genetics , hatching , population , zoology , allele , fish <actinopterygii> , gene , fishery , demography , sociology
Rainbow trout ( Salmo gairdneri ) with greater heterozygosity at enzyme loci also have greater developmental stability, as measured by bilateral symmetry of five meristic traits. Fish with increased amounts of liver phosphoglucomutase activity have greater developmental stability and develop faster than fish with normal activity. These observations suggest that the differences in developmental stability between homozygotes and heterozygotes may be the result of differences in developmental rate. Faster developmental rates are expected to decrease the probability of accidents during critical periods of development, resulting in a more stable or uniform phenotype. As indicated by differences in hatching time, heterozygotes tend to develop more rapidly than homozygotes. This association is not strongly expressed within families at any locus except Pgm1‐t . However, heterozygotes for Mdh3,4 and Hex hatched significantly sooner than homozygotes in a population sample. These results suggest that differences in developmental rate between homozygotes and heterozygotes may account for the positive association between developmental stability and heterozygosity in rainbow trout.