Interpreting Geographic Variation in Life-History Traits

Berven, Keith A.; Gill, Derek

doi:10.1093/icb/23.1.85

Cited by 547 publications

(461 citation statements)

References 10 publications

Supporting

Mentioning

439

Contrasting

Unclassified

Order By: Relevance

“…First, antagonistic pleiotropy would maintain genetic variation in both of the genetically correlated traits, yet I found evidence for genetic variation in only one trait (duration of larval period), although this could have been due to small sample size. Duration oflarval period may be genetically correlated with size at metamorphosis (Travis, 1980;Berven and Gill, 1983), but I did not find a correlation, either phenotypic or genetic, between these traits under laboratory conditions. Phenotypic correlations between these traits, however, depend on environmental conditions (Travis, 1984), and the same may be true for genetic correlations (Schlichting, 1986).…”

Section: Additive Genetic Effectsmentioning

confidence: 65%

“…These are not mutually exclusive explanations. Berven and Gill (1983) interpreted the existence of genetic variation as evidence for lack of selection (except in one population, where they inferred antagonistic pleiotropy). This explanation, that variation in development time is selectively neutral, seems extremely unlikely in desert rainpools.…”

Section: Additive Genetic Effectsmentioning

confidence: 99%

“…Natural populations ofanurans often exhibit considerable variation in traits that affect some component of fitness (Travis, 1980(Travis, , 1983a Berven and Gill, 1983). The selective regime and relationship between phenotype and fitness can be established through detailed ecological studies under field conditions.…”

mentioning

confidence: 99%

See 2 more Smart Citations

GENETIC VARIATION FOR LARVAL ANURAN (SCAPHIOPUS COUCHII) DEVELOPMENT TIME IN AN UNCERTAIN ENVIRONMENT

Newman

1988

Evolution

View full text Add to dashboard Cite

Abstract.-Couch's spadefoot toads (Scaphiopus couchii) breed in ponds of uncertain duration. In natural ponds, larvae exhibit considerable variation in growth, size at metamorphosis, and development time. Phenotypic differences in development time may dramatically affect survivorship in these ponds. A quantitative-genetic analysis of larval traits was undertaken to determine the potential evolutionary relevance of phenotypic variation observed in the field. Additive genetic variance was detected for development time, but not for any other trait. Some variation in early growth was attributed to maternal effects; maternal effects, however, were not apparent for size at metamorphosis or development time. Nonadditive genetic effects were not statistically significant for any trait, but the nonsignificance of these effects must be interpreted cautiously, as the sample of females was relatively small and the mating design used is not very effective for detecting interactions. Genetic variation in development time in this population is most likely maintained by variability in the direction of selection as a consequence of variation in pond duration.

show abstract

Section: Additive Genetic Effectsmentioning

confidence: 65%

Section: Additive Genetic Effectsmentioning

confidence: 99%

See 1 more Smart Citation

GENETIC VARIATION FOR LARVAL ANURAN (SCAPHIOPUS COUCHII) DEVELOPMENT TIME IN AN UNCERTAIN ENVIRONMENT

Newman

1988

Evolution

View full text Add to dashboard Cite

show abstract

“…Milkweed bugs (Oncopeltus fasciatus) from Iowa and Puerto Rico differ in body size and age at first reproduction (Dingle et al, 1982). Wood frogs (Rana sylvatica) differ in larval duration and size at metamorphosis among populations from mid-latitude (lowland: Maryland, montane; Virginia) and tundra (Manitoba) sites (Berven and Gill, 1982). In the lowland site selection appears to have acted to minimize variance in size but allow age at metamorphosis to vary, while the reverse was true for the tundra population (Berven, 1981).…”

mentioning

confidence: 99%

Life History Variation in a Freshwater Copepod: Evidence From Population Crosses

Allan

1984

Evolution

View full text Add to dashboard Cite

“…Early metamorphosis enables individuals to escape from drying of ephemeral ponds (Smith 1983;Newman 1988a,b) or from aquatic predators (Smith 1983(Smith , 1987Woodward 1983;Travis et al 1985), and may lead to earlier sexual maturity (Smith 1987). Large size at metamorphosis may enhance juvenile physiological and locomotor performance in the terrestrial environment (Pough and Kamel 1984;Taigen and Pough 1985;John-Alder and Morin 1990;Goater et al 1993;Newman and Dunham 1994); juvenile survivorship (Martof 1956;Berven and Gill 1983;Pfennig et al 1991;Scott 1994), for example, during the first hibernation; and may lead to the advantage of earlier first reproduction or larger size at first reproduction (Turner 1962;Clarke 1974;Berven and Gill 1983;Smith 1987;Semlitsch et al 1988;Berven 1990;Goater 1994;Scott 1994). Based on this evidence, it can reasonably be assumed that the larval life-history traits we measured as surrogates of fitness are in fact highly relevant components of individual fitness.…”

Section: Measures Of Performancementioning

confidence: 92%

Differential Performance Among LDH-B Genotypes in Rana Lessonae Tadpoles

Hotz

Semlitsch²

2000

Evolution

View full text Add to dashboard Cite

Abstract. The European pool frog, Rana lessonae, is widely polymorphic for two common alleles (b, e) at the lactate dehydrogenase-B (LDH-B) locus. We compared fitness-related larval life-history traits among LDH-B genotypes, which originated from segregation in heterozygous parents, in an artificial pond experiment where tadpoles of R. lessonae from a Swiss population were raised together with tadpoles of the hemiclonal hybrid R. esculenta at two densities. In R. lessonae, LDH-B e/e homozygotes at each density had a higher proportion of metamorphs among survivors, reached metamorphosis earlier, and were heavier at metamorphosis than b/b homozygotes; b/e heterozygotes had intermediate values. That e/e individuals were superior to b/b in both time to and mass at metamorphosis is surprising because these two life-history traits are thought to reflect a performance trade-off; e/e genotypes apparently compensated for shorter time to metamorphosis by a higher growth rate. The two alleles showed the same performance ranking when combined in hybrids with a R. ridibunda allele: When R. esculenta from Swiss populations reared in the same ponds had received the e allele rather than the b allele from their R. lessonae parent, they reached metamorphosis earlier, but did not differ in mass at metamorphosis. The degree of linkage disequilibrium in the source population of the eight R. lessonae used as parents of the R. lessonae tadpoles is unknown, so we cannot exclude the possibility that the performance differences are caused by some anonymous tightly linked gene, rather than the LDH-B locus, that constitutes the genomically localized target of natural selection. A causal involvement of LDH-B is plausible, nevertheless, because this enzyme takes part in the central energy-metabolizing processes and has been reported to underlie fitness differences in other animals; also, differential performance of LDH-B genotypes has been observed in R. lessonae larvae from another population. The present results suggest strong directional selection for allele e; the sum of available data, including an independent laboratory experiment, suggests that partial environmentdependent overdominance combined with balancing selection favoring e/e homozygotes under some and b/b homozygotes under other conditions may be partially responsible for the broad maintenance of the LDH-B polymorphism in R. lessonae.

show abstract

Interpreting Geographic Variation in Life-History Traits

Cited by 547 publications

References 10 publications

GENETIC VARIATION FOR LARVAL ANURAN (SCAPHIOPUS COUCHII) DEVELOPMENT TIME IN AN UNCERTAIN ENVIRONMENT

GENETIC VARIATION FOR LARVAL ANURAN (SCAPHIOPUS COUCHII) DEVELOPMENT TIME IN AN UNCERTAIN ENVIRONMENT

Life History Variation in a Freshwater Copepod: Evidence From Population Crosses

Differential Performance Among LDH-B Genotypes in Rana Lessonae Tadpoles

Contact Info

Product

Resources

About