Selection Component Analysis of Natural Polymorphisms using Mother-Offspring Samples of Successive Cohorts

Christiansen, F.; Frydenberg, Ove

doi:10.1016/b978-0-12-398560-6.50017-1

Cited by 17 publications

(18 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The common homozygote had higher fecundity than heterozygotes for Pgi in Asellus aquaticus (Shihab and Heath, 1987 that zygotic selection may favour heterozygotes at some times of the year (Shihab and Heath, 1987b). Heterozygotes appeared to have the lowest zygotic fitness at the Est locus in the fish Z. viviparus, and extensive studies have not revealed a counteracting selection component that would result in a balanced polymorphism (Christiansen et a!., 1973(Christiansen et a!., , 1977; one possibility is that heterozygotes swim slightly faster and were better able to escape being caught in the nets. When selection is detected in natural populations, it is unknown whether the differences in fitness result entirely from the locus examined or whether other loci in gametic disequilibrium also contribute.…”

Section: Juvenile Zygotic Selectionmentioning

confidence: 99%

“…Fewer still have measured more than one component of selection; among the only loci for which gametic, fecundity, sexual, and zygotic selection have been measured in natural populations of animals are the loci coding for esterase in Zoarces viviparus (Christiansen et al, 1973(Christiansen et al, , 1977, lactate dehydrogenase in Porcellio scaber (Sassaman, 1978), phosphoglucose isomerase in Sphaeroma rugicauda (Heath et a!., 1988), and three loci in Peromyscus maniculatus Baccus, 1981, 1983;Snyder, 1983). All components but fecundity have been measured for two loci in Gammarus oceanicus (Siegismund, 1985a).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selection component analysis of the Mpi locus in the amphipod Platorchestia platensis

McDonald

1989

Heredity

View full text Add to dashboard Cite

Genotype frequencies of gravid females and their offspring, of non-gravid females, and of adult males were measured for the Mpi locus in a natural population of the amphipod Platorchestia platensis. These gave tests of gametic, sexual, fecundity and zygotic selection. The genotype distribution of adult males was significantly different from that of adult females. There were more heterozygous males than expected, suggesting that zygotic selection and not immigration produced the difference between the sexes.

show abstract

Section: Juvenile Zygotic Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selection component analysis of the Mpi locus in the amphipod Platorchestia platensis

McDonald

1989

Heredity

View full text Add to dashboard Cite

show abstract

“…However, neither obvious seasonal pattern nor evidence for depth migration, as found in other investigations (Jansson et al 1985, Ojaveer 1997, was observed. The sex ratio in the spawning area in Kaloe Cove near Aarhus deviated significantly from 1:1 over 6 yr, with an excess of females in all years (Christiansen et al 1977). The fishing period was November to December and the result could be explained by selectivity of the fishing gear for the gravid females.…”

Section: Discussionmentioning

confidence: 94%

Population differentiation of eelpout Zoarces viviparus in a Danish fjord

Olsen¹,

Richardson²,

Simonsen³

2002

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Studies carried out in the early and mid-1900s demonstrated the presence of 2 separate populations of eelpout Zoarces viviparus associated with the outer and inner parts, respectively, of Mariager Fjord in eastern Jutland, Denmark. In 1997, the fjord experienced a major fish kill resulting from a hypoxia/anoxia event. The purpose of this study was to examine whether 2 populations could still be identified in this fjord in 1998. The same morphological traits and genetic methods used in the earlier studies were employed for the present study. Neither the morphological characteristics nor any of the 7 investigated allozymes examined revealed any population differentiation between fish caught in the inner and outer fjord in 1998. It was concluded that there was no population differentiation in eelpout in this fjord in 1998. In addition, growth rates (estimated from otolith growth zones) appeared to be the same in fish caught in the inner and outer fjord in 1998. Estimated growth rates for fish in autumn/winter 1997 to spring/summer 1998 (assumed to be the growth season for the year of the hypoxia event) were lower than those estimated for autumn/winter 1996 to spring/summer 1997. Genetic data obtained in studies from the 1970s were re-examined and the earlier conclusion regarding the existence of 2 populations was confirmed to be robust. Thus, a change in population distributions of eelpout may have occurred in this fjord between the 1970s and the late 1990s. As the characteristics of the fish found throughout the fjord in 1998 resembled those of the 'outer fjord' population identified in earlier studies, it is argued that the inner fjord population identified in earlier studies has been reduced or eliminated and that the outer fjord population has moved into the inner fjord. A comparison of catch statistics from the 1970s and 1998 suggests a major decrease in stock size during this same period.

show abstract

“…Christiansen & Frydenberg, 1976;Allendon & Leary, 1986;Zouros et al, 1988;Liskauskas & Ferguson, 1990;Whitehurst & Pierce, 1991) may reflect interspecific variation in the strength of genetic correlations among life-history traits. Most of the positive correlations for fecundity have been found in organisms in which variation in offspring size, above a physiological minimum, confers no variation in offspring fitness.…”

Section: Discussionmentioning

confidence: 99%

The independence of enzyme heterozygosity and life-history traits in natural populations of Salvelinus fontinalis (brook trout)

Hutchings

Ferguson²

1992

Heredity

View full text Add to dashboard Cite

The relationship was examined between allozyme heterozygosity at six polymorphic loci and several life-history traits (age and size at maturity, egg size, fecundity, proportional allocation of body tissue to gonads) within five natural, unexploited populations of brook trout (Salvelinus fontinalis) on Cape Race, Newfoundland, Canada. We tested two predictions of the hypothesis that increased allozyme heterozygosity enhances fitness. We found little or no support for the predictions that single or multilocus heterozygosity is (i) positively associated with the phenotypic value of life-history traits, and is (ii) negatively associated with trait variances. Neither single nor multilocus heterozygosity was positively associated with a life-history trait in 67 within-population analyses. Trait variance decreased significantly with increased multilocus heterozygosity in only 1 of 25 cases. We conclude that trade-offs, non-directional selection, relatively high environmental variation in life-history traits, and conflicting selection pressures on the same trait (in different stages of life) may combine to reduce the likelihood of detecting significant correlations between heterozygosity and those traits most closely related to fitness in natural populations.

show abstract

Selection Component Analysis of Natural Polymorphisms using Mother-Offspring Samples of Successive Cohorts

Cited by 17 publications

References 7 publications

Selection component analysis of the Mpi locus in the amphipod Platorchestia platensis

Selection component analysis of the Mpi locus in the amphipod Platorchestia platensis

Population differentiation of eelpout Zoarces viviparus in a Danish fjord

The independence of enzyme heterozygosity and life-history traits in natural populations of Salvelinus fontinalis (brook trout)

Contact Info

Product

Resources

About