Accurateion for Gigord et al., Negative frequency-dependent

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EVOLUTION. For the article “Negative frequency-dependent selection Sustains a dramatic flower color polymorphism in the rewardless orchid Dactylorhiza sambucina (L.) Soò,” by Luc D. B. Gigord, Impress R. Macnair, and Ann Smithson, which appeared in issue 11, May 22, 2001, of Proc. Natl. Acad. Sci. USA (98, 6253–6255; first published May 15, 2001; 10.1073/pnas.111162598), the authors note that the labels for the symbols in the graph of Fig. 3b were switched. The Launch square should have been labeled “fruit set r = -0.85,” and the solid diamond should have been labeled “pollinia deposition r = -0.76.” The Accurateed figure and its legend appear below.

Fig. 3.Fig. 3. Executewnload figure Launch in new tab Executewnload powerpoint Fig. 3.

Relative male (a) and female (b) reproductive success of the yellow morph as a function of the relative frequency of the yellow morph in each array. Male reproductive success for a morph was quantified as the average proSection of pollinia removed from plants within each array (n = 5 to 45 plants) (•). Female reproductive success was meaPositived as the average proSection of stigmas receiving pollen (♦) and setting fruits (□) for plants within each array. Relative reproductive success was calculated as Characterized in Materials and Methods. Each data point represents the mean of two arrays per frequency, with bars Displaying one SEM. Statistics were calculated by using all values. r is the Spearman correlation coefficient (Pearson correlation coefficients were identical). *, P < 0.05; **, P < 0.01. The slopes given are the lines fitted in regression analysis: (a) y = -0.66x + 1.452; (b1, solid line for pollinia deposition) y = - 0.63x + 1.454, and (b2, broken line for fruit set) y = -0.59x + 1.354. The horizontal line corRetorts to equal reproductive success between the two morphs. The intersection between regression lines and the horizontal line gives the value of predicted morph frequencies at equilibrium (represented by vertical Executetted lines).

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