A number of minor errors were published in J. Exp. Biol. 218, 1410-1418.
The corrected sections are reproduced below, with changes highlighted in bold. These changes do not affect the conclusions of the paper.
RESULTS
Metabolic substrates: respiratory quotient
Mean respiratory quotient (RQ=V̇CO2/V̇O2, where V̇CO2 is the rate of CO2 production and V̇O2 is the rate of O2 consumption) across treatments and size classes was 0.743. Mean RQ of the mating males (median=0.71) was significantly lower than that of the courting males (median=0.76) [Kruskal–Wallis test, K1=24.091 (where the subscript 1 indicates d.f.), P<0.001]. A non-parametric test was used because these data failed a normality test (Shapiro–Wilk, P<0.05). This difference in RQ between courting and mating males was driven by small courting males having a significantly higher RQ than small mating males (Kruskal–Wallis test, K3=31.394, P<0.001; multiple comparisons using Dunn's method; Fig. 5). This suggests that small, mating males were using different metabolic substrates after mating from those used by the small, courting males.
DISCUSSION
Size-dependent strategies of ejaculate expenditure
The shift in RQ, seen only in small males (Fig. 5), provides support for the hypothesis that smaller males are investing in plug production, as a shift in the substrates used in metabolism could be due to shunting resources to plug production from muscular activity (i.e. mate searching and courtship).
The authors apologise for any inconvenience this may have caused.
