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If the coccinellid captures one or more aphids, the total time spent on the plant is increased by the time taken to eat the prey, which is proportional to the biomass of the prey. The numbers of aphids and coccinellids counted on the plot are shown in figure 5.05.
Source: wiktionary
Thus aphids are an important factor for coccinellids, but other issues are involved as well. The correlation between aphid and coccinellid abundance is significant, but shows such a high variance that no predictions are possible.
Source: wiktionary
The above comparative account reveals coccinellids to be more voracious, with both adults and larvae predatory in nature. Also, coccinellids are more fecund than both chrysopids and syrphids and have a longer oviposition period.
Source: wiktionary