Components of fitness and the PGI polymorphism in the freshwater isopod Asellus aquaticus (L). 1. Fecundity selection

Shihab, A F; Heath, David

doi:10.1038/hdy.1987.10

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…One possibility is that PGI is closely linked to one or more other loci that are under natural selection. Another possibility is that PGI itself is under selection, which is consistent with functional differences in thermal stability and binding constant that exist among PGI genotypes (Dahlhoff & Rank 2000; E. Dahlhoff, unpublished data), and consistent with results found for a variety of other taxa (Shihab & Heath 1987; Johannesson, Kautsky & Tedengren 1990; Watt 1992; Katz & Harrison 1997; Watt et al . 2003).…”

Section: Discussionsupporting

confidence: 76%

Natural temperature variation affects larval survival, development and Hsp70 expression in a leaf beetle

et al. 2005

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Summary1. Sierra Nevada populations of the beetle Chrysomela aeneicollis experience extreme high and low temperatures during summer, which pose special challenges to larvae of limited mobility. In these populations, allele frequency variation at the glycolytic enzyme locus phosphoglucose isomerase (PGI) correlates with differences in temperature between river drainages. PGI allozymes differ in functional properties, and thermal tolerance of adults and larvae depends on PGI genotype. 2. We measured effects of temperature on larval development rate and survival after reciprocal transplantation of populations between drainages. Effects of temperature on growth rate and activity were determined after laboratory acclimation of larvae from Bishop Creek (BC), where PGI alleles 1 and 4 occur in similar frequency. Hsp70 expression levels were measured for free-living larvae of known body temperature, and for laboratory-acclimated BC larvae. 3. Larval mortality was greatest in the coldest drainage and was correlated with minimum night-time air temperature. The frequency of PGI allele 1 declined for BC larvae transplanted to the warmest drainage. Development rate of BC larvae in nature was lowest for experimental groups where PGI-1 allele frequency was highest. Larval growth and activity varied with acclimation temperature and PGI genotype in the laboratory. Hsp70 expression levels in nature were higher for larvae collected later in the day, and varied consistently among PGI genotypes in nature and in the laboratory. 4. These results suggest that daytime temperatures routinely experienced by larvae cause elevated Hsp70 expression levels indicative of physiological stress. Exposure to subzero night-time temperatures appears to cause larval mortality. Up-regulation of Hsp70 may protect larvae from heat and cold stress. Variation in Hsp70 expression among PGI genotypes may result in differential mortality and developmental rates in nature.

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Section: Discussionsupporting

confidence: 76%

Natural temperature variation affects larval survival, development and Hsp70 expression in a leaf beetle

et al. 2005

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Section: Discussionmentioning

confidence: 99%

“…Ever since biochemical genetic markers were adopted to study the evolutionary history of populations and species, PGI has stood out among genes coding for metabolic enzymes as a candidate to study effects of natural selection and adaptation on allelic variation (Gillespie 1991;Watt 1991;Riddoch 1993;Mitton 1997). PGI variation is associated with performance and fitness characters in a wide variety of animals (Corbin 1977;Shihab and Heath 1987;Watt 1992;Dahlhoff and Rank 2000;Karl et al 2010;Wheat 2010;Lockwood and Somero 2012), plants (Lönn et al 1996;Lonn et al 1998;Travers and Mazer 2001), and bacteria (Dykhuizen and Hartl 1983). In many of these organisms, PGI allozymes differ in biochemical properties such as binding constant (K m ) and thermal stability (Watt et al 1996;Dahlhoff and Rank 2000;Lockwood and Somero 2012).…”

Section: Coii Gene)mentioning

confidence: 99%

Mitonuclear mismatch alters performance and reproductive success in naturally introgressed populations of a montane leaf beetle*

et al. 2020

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“…Previous studies on C. aeneicollis and other organisms propose that Pgi is likely a key enzyme for temperature adaptation. Population genetic studies have revealed unusual patterns of variation at Pgi in a wide range of organisms, including sea anemones (Hoffmann 1981a,b), mollusks (Byers 1983;Lavie and Nevo 1986;Johannesson et al 1990), insects (Watt 1983;Zera 1987a,b;Katz 1997;Katz and Harrison 1997), isopods (Edwards and Heath 1983;Shihab and Heath 1987;McCluskey et al 1993), plants (Gottlieb and Greve 1981;Filatov and Charlesworth 1999), and bacteria (Dykhuizen and Hartl 1983). Temperature affects Pgi allozyme functional properties such as Michaelis-Menten binding constant, K m , and thermal stability in a diverse array of species (Hoffmann 1981a;Watt 1983;Mitton 1997).…”

Section: Physiological Consequences Of Extreme Temperaturementioning

confidence: 99%

“…Other studies suggest that allozyme variation may result from directional selection occurring along latitudinal or tidal clines (Powers and Place 1978;Johannesson et al 1995;Schmidt and Rand 1999;Dahlhoff and Rank 2000). Evidence for both balancing and directional temperature selection on the glycolytic enzyme phosphoglucose isomerase (Pgi) has been found for a wide range of taxa (Corbin 1977;Watt 1977Watt , 1992Shihab and Heath 1987;Hoffmann 1981b;Johannesson et al 1995;Katz and Harrison 1997). However, no studies to date have documented a link between changes in allele frequency at Pgi and fluctuations in climate.…”

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confidence: 99%

Allele Frequency Shifts in Response to Climate Change and Physiological Consequences of Allozyme Variation in a Montane Insect

Rank

Dahlhoff

2002

Evolution

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Rapid changes in climate may impose strong selective pressures on organisms. Evolutionary responses to climate change have been observed in natural populations, yet no example has been documented for a metabolic enzyme locus. Furthermore, few studies have linked physiological responses to stress with allozyme genotypic variation. We quantified changes in allele frequency between 1988 and 1996 at three allozyme loci (isocitrate dehydrogenase, Idh; phosphoglucose isomerase, Pgi; and phosphoglucomutase, Pgm) for the leaf beetle Chrysomela aeneicollis in the Bishop Creek region of the Sierra Nevada of California (2900-3300 m). Beetles often experience high daytime (> 32 degrees C) and extremely low nighttime (< -5 degrees C) temperatures during summer. Bishop Creek weather station data indicated that conditions were unusually dry before 1988, and that conditions were cool and wet during the years preceding the 1996 collection. We found directional changes in allele frequency at Pgi (11% increase in the Pgi-1 allele), but not at Idh or Pgm. We also found that physiological response to thermal extremes depended on Pgi genotype. Pgi 1-1 individuals induced expression of a 70-kD heat shock protein (HSP) at lower temperatures than 1-4 or 4-4 individuals, and 1-1 individuals expressed higher levels of HSP70 after laboratory exposure to temperatures routinely experienced in nature. Survival after nighttime laboratory exposure to subzero temperatures depended on gender, previous exposure to cold, and Pgi genotype. Females expressed higher levels of HSP70 than males after exposure to heat, and recovery by female Pgi 1-1 homozygotes after exposure to cold (-5 degrees C) was significantly better than 1-4 or 4-4 genotypes. These data suggest that the cooler climate of the mid-1990s may have caused an increase in frequency of the Pgi-1 allele, due to a more robust physiological response to cold by Pgi 1-1 and 1-4 genotypes.

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Components of fitness and the PGI polymorphism in the freshwater isopod Asellus aquaticus (L). 1. Fecundity selection

Cited by 12 publications

References 17 publications

Natural temperature variation affects larval survival, development and Hsp70 expression in a leaf beetle

Natural temperature variation affects larval survival, development and Hsp70 expression in a leaf beetle

Mitonuclear mismatch alters performance and reproductive success in naturally introgressed populations of a montane leaf beetle*

Allele Frequency Shifts in Response to Climate Change and Physiological Consequences of Allozyme Variation in a Montane Insect

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