THE ESTIMATION OF RELATIVE FITNESS OF <i>DROSOPHILA</i>
 POPULATIONS. II. EXPERIMENTAL EVALUATION OF FACTORS AFFECTING FITNESS

Barker, J. S. F.

doi:10.1111/j.1558-5646.1963.tb03254.x

Cited by 16 publications

(6 citation statements)

References 36 publications

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“…Claringbold and Barker (1961) developed a mathematical model for estimating the fitness of populations competing with organisms of a different species. This model has been widely tested by Barker (1963aBarker ( , 1963bBarker ( , 1965Barker ( , 1967. The fitness estimates are based on census of the populations at one generation intervals.…”

Section: Discussionmentioning

confidence: 99%

“…The fitness estimates are based on census of the populations at one generation intervals. The model is most useful if the proportions of the two species remain between 10 and 90% for a number of generations (Barker, 1963a) . The model developed by Ayala (1969b) to estimate relative fitness of populations competing with a different species permits scoring the two competing species at intervals of time of any length.…”

Section: Discussionmentioning

confidence: 99%

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Population Fitness of Geographic Strains of Drosophila serrata as Measured by Interspecific Competition

Ayala¹

1970

Evolution

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Biological evolution results from natural selection promoting or conserving the adaptedness of populations of organisms to their changing environments. The fitness, or adaptedness, of a population to its environment is a property of prime importance in evolutionary studies. Population adaptedness must be quantified in order to measure the effect of natural selection on a population, or in order to compare meaningfully different populations.Average population size after achievement of an equilibrium, and numbers of individuals produced per unit time, were used as measures of the relative adaptedness of three geographic strains of D. serrata (Ayala, 1965). The adaptedness of the populations was estimated at two temperatures, 19C and 2SC. The experiments reported now represent an attempt to measure the fitness of these three geographic strains of D. serrata by their performance in interspecific competition. Three experiments were carried out. In the first experiment each strain of D. serrata competed with a standard strain of D. pseudoobscura; in the second experiment they competed with a strain of D. melanogaster; and in the third experiment each strain of D. serrata competed with a strain of D. nebulosa. The first two experiments were performed at 25C, and the third at 19C. One objective of these experiments was to find out whether there was any consistency among the estimates of relative fitness in the various interspecific competitions, and of these estimates with those obtained in the previous experiment where fitness was measured by population size and productivity of single-species populations. MATERIALS AND METHODS

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Population Fitness of Geographic Strains of Drosophila serrata as Measured by Interspecific Competition

Ayala¹

1970

Evolution

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“…Using the same strains of D. melanogaster and D. simulans as here, Barker (1963a) found no effect of initial proportions on the relative fitness of D. melanogaster where the initial frequency of this species was 10, 20 or 30%o. However, effects of initial proportions of the two species Tribolium castaneum and T. confusum on competitive outcome in continuous populations have been demonstrated by Park (1957) and Leslie, Park and Mertz (1968).…”

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confidence: 88%

“…In previous papers (Claringbold and Barker 1961, Barker 1963a, b, 1967a, evaluation of a technique for the estimation of relative fitness of populations of Drosophila melanogaster has been discussed. The fitness estimate is obtained from the changes in frequency of the population under test, when in competition in a closed environment with a vermilion mutant strain of the noninterbreeding sibling species D. simnuans.…”

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confidence: 99%

Interspecific Competition Between Drosophila Melanogaster and Drosophila Simulans: Effects of Larval Density on Viability, Developmental Period and Adult Body Weight

Barker

Podger

1970

Ecology

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“…In addition to evaluating these individual components of fitness, a comparison of the fitness of polymorphic (AR + CH) and monomorphic (AR/AR) and (CHICH) populations was obtained through competition with a standard population of a non-interbreeding species (Claringbold and Barker, 1961;Barker, 1963). D. nebulosa was used as a competitor for D. pseudoobscura (Barker, 1965 The initial stocks used in these studies were 7 AR and 7 CH strains isolated from population No. 173 by Druger during the summer of 1966 (9% years after cage founding), and maintained individually in bottle cultures until the fall of 1967.…”

Section: Superiority Of Inversion Heterozygotesmentioning

confidence: 99%

Maintenance of Chromosomal Polymorphism in a Population of Drosophila pseudoobscura. II. Fecundity, Longevity, Viability and Competitive Fitness

Nickerson¹,

Druger²

1973

Evolution

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THE ESTIMATION OF RELATIVE FITNESS OF DROSOPHILA POPULATIONS. II. EXPERIMENTAL EVALUATION OF FACTORS AFFECTING FITNESS

Cited by 16 publications

References 36 publications

Population Fitness of Geographic Strains of Drosophila serrata as Measured by Interspecific Competition

Population Fitness of Geographic Strains of Drosophila serrata as Measured by Interspecific Competition

Interspecific Competition Between Drosophila Melanogaster and Drosophila Simulans: Effects of Larval Density on Viability, Developmental Period and Adult Body Weight

Maintenance of Chromosomal Polymorphism in a Population of Drosophila pseudoobscura. II. Fecundity, Longevity, Viability and Competitive Fitness

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