The components of life-history traits variation in Daphnia magna population

Yampolsky, Lev Y.; Kalabushkin, B. A.

doi:10.1007/978-94-017-0918-7_24

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…In experiment I, only two replicates per clone were available; these two individuals shared a single mother and were kept in a single vial. Although estimates of genetic variation in this experiment are suspect because ofthe potentially confounding ofgenetic, vial, and maternal effects (Yampolsky and Kalabushkin 1992), estimates of residual variation are free from environmental, maternal, and genetic effects. In the other experiments-2, 3, and 4-two to five (usually three) replicates per clone per environment were available.…”

Section: Methodsmentioning

confidence: 94%

“…Replicates within clones were obtained parthenogenetically. The populations from which the clones originated are known to reproduce by means of cyclic parthenogenesis (Yampolsky and Kalabushkin 1992;Ebert et al 1993).…”

Section: Methodsmentioning

confidence: 99%

“…In this paper, we examine the relationship between developmental noise, phenotypic plasticity, and allozyme heterozygosity in the water flea, Daphnia magna (Cladocera: Crustacea) using previously unanalyzed data from four published studies (Yampolsky and Kalabushkin 1991;Yampolsky 1992a,b;Ebert et al 1993). Earlier we (Yampolsky and Kalabushkin 1991) reported a significant heterozygosity-by-environment interaction in body size and fecundity. For these traits, the most heterozygous clones had the smallest differences in these traits (lowest plasticity) among food concentrations.…”

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confidence: 99%

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DEVELOPMENTAL NOISE, PHENOTYPIC PLASTICITY, AND ALLOZYME HETEROZYGOSITY IN DAPHNIA

Yampolsky

Scheiner

1994

Evolution

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Previous theories and studies have postulated negative correlations between allozyme heterozygosity and developmental noise and between heterozygosity and phenotypic plasticity. We examined these relationships for morphological and life-history traits of Daphnia magna in four independent experiments using two different Moscow populations and one German population. Clones were raised under a range of food levels or individual densities. Heterozygosity was scored at five allozyme loci in two experiments and at three loci in two others. Relative differences in developmental noise among clones with different heterozygosity levels were estimated as the pooled residual variation from an analysis of variation that removed the effects of macroenvironment, clones, and their interaction. Plasticity was measured as the amount of macroenvironmental variation plus genotype-by-environment interaction variation. We found a positive correlation between developmental noise and heterozygosity, although this correlation varied among traits and experiments. This result contradicts most previous claims about these relationships. In contrast, we found that phenotypic plasticity and heterozygosity were negatively correlated for some traits. Developmental noise and phenotypic plasticity were correlated for only two traits in two different experiments. This trait-specific relationship is in concordance with previous studies. Our results could not be explained by effects of developmental time, a previously hypothesized mechanism. We propose several explanations for our results and the disparate results of others that do not require that heterozygosity be the actual cause of variation in developmental noise.

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Section: Methodsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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DEVELOPMENTAL NOISE, PHENOTYPIC PLASTICITY, AND ALLOZYME HETEROZYGOSITY IN DAPHNIA

Yampolsky

Scheiner

1994

Evolution

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“…Local adaptation of D. magna clones will be the result of a whole suite of environmental factors, among which temperature and food conditions are probably very important. There is evidence for the seasonal prevalence of temperature-adapted clones of D. magna (Carvalho, 1987), and clonal differences in the response of life-history parameters to food conditions have been reported (Yampolski & Kalabushkin, 1991;Ebert, Yampolsky & Stearns, 1993;Mitchell, 1997). The typical pattern of seasonal succession in lakes (Sommer et al, 1986) combines periods of differing temperature and food supply.…”

Section: Introductionmentioning

confidence: 99%

Temperature reaction norms of Daphnia magna: the effect of food concentration

2001

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1. The effects of temperature and food concentration on the fitness of Daphnia magna were tested in a 4×4 factorial flow‐through design. Food ranged from 0.1 to 1.0 mg C L−1 and temperature ranged from 15 to 30 °C.  2. The juvenile growth rate (gj) was used to construct reaction norms for temperature at varying food concentrations. Two clones isolated from the same pond at different seasons did not differ with respect to their temperature responses. Reaction norms had the shape of an optimum curve with highest values around 20 °C. There was a significant temperature–food interaction as the temperature response was most pronounced when the food was not limiting.  3. Differences in fitness were a consequence of different responses of physiological parameters to food and temperature. Age and size at first reproduction, as well as egg numbers, decreased with increasing temperature and decreasing food concentration.  4. As the temperature effect was strongest at the highest food concentrations, it can be concluded that environmental warming may affect D. magna more through a temperature rise earlier in spring rather than in summer.

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“…Although interclonal differences in fitness-related life-history traits, such as body length, clutch size and age at first reproduction (Yampolsky & Kalabushkin 1991;Ebert 1993;Ebert, Yampolsky & Van Noordwijk 1993;Ebert, Yampolsky & Stearns 1993;Yampolsky & Ebert 1994;Yampolsky & Scheiner 1994), and genetic variation in the trade-offs between offspring size and offspring number (Ebert 1993;Glazier 1992) in D. magna certainly exist, their genetic basis remains in doubt given the large direct (e.g. culture conditions;McCauley et al 1990;Baird et al 1989a) and indirect (e.g.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic plasticity and constancy of life‐history traits in laboratory clones of Daphnia magna Straus: effects of neonatal length

Barata¹,

Baird²

1998

Functional Ecology

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Summary1. The phenotypic constancy of four laboratory Daphnia magna clones in fitnessrelated life-history traits, such as age and clutch size at maturity, was studied among consecutive experimental runs in differing food environments. 2. A significant part of the observed clonal and genetic-by-environmental variation in age and clutch size at maturity was explained by experimentally uncontrollable variations in neonatal body length. 3. Despite food availability, neonatal length determined the number of instars invested to maturity and thus maturation age. Clonal differences in neonatal length and thus in maturation instar occurrence across environments explained most of the clonal variability observed in maturation age. 4. Although interclonal differences in clutch size existed, most of the phenotypic plasticity observed for clutch size was mediated by clonal differences in neonatal length. 5. Clonal differences in neonatal length and in the occurrence of maturation instars across environments dramatically affected the body length of instar IM-2 where provisioning of eggs take place. Since clutch size is determined from clutch mass and clutch mass was strongly related to the body length of instar IM-2, clonal differences across environments in body length of instar IM-2 mirrored clonal differences across environments in clutch size. 6. The results reported in the present study show that maternally mediated traits such as neonatal length affect how genotypes respond to different environmental selection regimes (genetic-by-environmental interaction). Future research needs to focus on the effects of neonatal length on the heritability or genetic variation of the reaction norms, since prediction of the response to selection is a key research objective in quantitative genetic studies.

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The components of life-history traits variation in Daphnia magna population

Cited by 10 publications

References 16 publications

DEVELOPMENTAL NOISE, PHENOTYPIC PLASTICITY, AND ALLOZYME HETEROZYGOSITY IN DAPHNIA

DEVELOPMENTAL NOISE, PHENOTYPIC PLASTICITY, AND ALLOZYME HETEROZYGOSITY IN DAPHNIA

Temperature reaction norms of Daphnia magna: the effect of food concentration

Phenotypic plasticity and constancy of life‐history traits in laboratory clones of Daphnia magna Straus: effects of neonatal length

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