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- W2137409148 abstract "Ten clonal isolates of Thalassiosira tumida (Janisch) Hasle were grown in duplicate semi-continuous batch cultures at 116 and 11.6 μE.m−2.s−1; acclimated cells were harvested during exponential growth and cleaned for examination by light microscopy (LM) and scanning electron microscopy (SEM). Number of strutted processes surrounding the central annulus (SP) and average number of satellite pores per process (AVSAT) were counted using SEM on 20 valves from each culture grown in high light, for a total of 400 valves examined; number of marginal labiate processes (LP) and overall diameter (DIAM) were measured using LM on 20 valves from each culture grown in both high and low light for a total of 800 valves examined. Univariate analysis of variance showed that bottle effects resulting from microenvironmental differences between replicates were a small but significant source of variation in DIAM, LP, and SP but not AVSAT. Significant differences among clones were observed for all characters. Decreased irradiance resulted in a significant decrease in valve diameter but no significant effect on LP; no light x clone interaction was obsered. Significant covariance between characters among clones was also observed; since valve diameter is known to decrease during asexual growth, the correlation coefficients for SP, AVSAT, and LP with DIAM were used to correct the data for this source of nongenetic differences between clones. Analysis of the size-corrected data showed that the proportion of total phenotypic variance in SP, LP, and AVSAT caused by genetic differences among clones was 0.14, 0.14, and 0.30, respectively. This indicates that the majority of total phenotypic variance was due to environmental or developmental causes, but that sufficient genetic variability exists to support rapid phenotypic evolution in SP, LP, and AVSAT under continued directional selection. Finally, the results of the genetic analysis revealed a high (0.82) genetic correlation between SP and LP." @default.
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- W2137409148 date "2007-04-30" @default.
- W2137409148 modified "2023-10-10" @default.
- W2137409148 title "QUANTITATIVE GENETIC ANALYSIS OF MORPHOLOGICAL VARIATION IN AN ANTARCTIC DIATOM GROWN AT TWO LIGHT INTENSITIES1" @default.
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- W2137409148 doi "https://doi.org/10.1111/j.1529-8817.1987.tb04425.x" @default.
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