ENZYME HETEROZYGOSITY AND GROWTH IN RAINBOW-TROUT - GENETIC AND PHYSIOLOGICAL EXPLANATIONS

被引:30
作者
FERGUSON, MM
机构
[1] Department of Zoology, University of Guelph, Guelph, ON
基金
加拿大自然科学与工程研究理事会;
关键词
ASSOCIATIVE OVERDOMINANCE; FISH; GROWTH-HETEROZYGOSITY; RNA CONCENTRATION; SEXUAL MATURATION;
D O I
10.1038/hdy.1992.18
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The possibility of whether the association between enzyme heterozygosity and body size (fork length) is consistent among rainbow trout (Oncorhynchus mykiss) with different degrees of relationship and is affected by fish age was determined. Six-month-old full-sibs and progeny groups from five and 13 parents of each sex do not show the positive associations between multilocus heterozygosity and fork length which are detectable in larger pooled gamete matings (25 female x 25 male). Moreover, the relationship between heterozygosity at single loci and fork length is inconsistent among families. These data suggest that chromosomal segments, marked by the enzyme loci, are responsible for the phenotypic effects (associative overdominance). Fish age affects both the strength and direction of the association between multilocus heterozygosity and fork length; the association is positive in 6-month-old rainbow trout but is weaker, negative, or differs between the sexes in fish at 1 year. Moreover, the strength of the relationship changes over time in repeated measurements on the same fish. A decline in growth of larger and more heterozygous fish, because of precocial sexual maturation, may partially explain the changing relationship between multilocus heterozygosity and fork length. Sexually mature males are significantly more heterozygous than immature males and show significantly reduced recent growth rates as measured by white muscle RNA concentration. However, females, who rarely mature at 1 year, show significantly higher recent growth rates. Thus, heterozygosity is differentially associated with the allocation of energy resources into somatic and reproductive tissue in male and female rainbow trout.
引用
收藏
页码:115 / 122
页数:8
相关论文
共 37 条
[1]  
Allendorf F.W., 1986, P57
[2]  
ALLENDORF FW, 1977, HEREDITAS, V86, P179
[3]  
BEAUMONT AR, 1985, 19TH P EUR MAR BIOL, P243
[4]  
Bulow F.J., 1987, P45
[5]   HETEROZYGOSITY AND COMPONENTS OF FITNESS IN A STRAIN OF RAINBOW-TROUT [J].
DANZMANN, RG ;
FERGUSON, MM ;
ALLENDORF, FW .
BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 1988, 33 (03) :285-304
[6]   DOES ENZYME HETEROZYGOSITY INFLUENCE DEVELOPMENTAL RATE IN RAINBOW-TROUT [J].
DANZMANN, RG ;
FERGUSON, MM ;
ALLENDORF, FW .
HEREDITY, 1986, 56 :417-425
[7]   HETEROZYGOSITY AND OXYGEN-CONSUMPTION RATE AS PREDICTORS OF GROWTH AND DEVELOPMENTAL RATE IN RAINBOW-TROUT [J].
DANZMANN, RG ;
FERGUSON, MM ;
ALLENDORF, FW .
PHYSIOLOGICAL ZOOLOGY, 1987, 60 (02) :211-220
[8]   RNA/DNA RATIOS IN WHITE MUSCLE AS ESTIMATES OF GROWTH IN RAINBOW-TROUT HELD AT DIFFERENT TEMPERATURES [J].
FERGUSON, MM ;
DANZMANN, RG .
CANADIAN JOURNAL OF ZOOLOGY, 1990, 68 (07) :1494-1498
[9]   DISTRIBUTION AND PHENOTYPIC CORRELATES OF VARIATION AT ENZYME CODING LOCI IN RAINBOW-TROUT (ONCORHYNCHUS-MYKISS) FROM THE LOWER LAURENTIAN GREAT-LAKES [J].
FERGUSON, MM ;
IHSSEN, PE .
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, 1991, 48 (07) :1308-1315
[10]  
FERGUSON MM, 1989, T AM FISH SOC, V118, P709, DOI 10.1577/1548-8659(1989)118<0709:NEOTCA>2.3.CO