Life table parameters of the pseudococcid predators Nephus includens and Nephus bisignatus (Coleoptera: Coccinelidae)

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Abstract

The fecundity of the pseudococcid predators Nephus includens (Boheman)<br />and N. bisignatus (Kirsch) (Coleoptera: Coccinellidae), fed on Planococcus<br />citri Risso (Hemiptera: Pseudococcidae), was studied at several constant<br />temperatures (15, 20, 25, 30, 32.5 and 35 degrees C). With additional<br />data for the development of the immature stages, life-fecundity tables<br />were constructed and some population parameters calculated. The average<br />total fecundities of N. includens at the above temperatures were<br />49.2, 97.8, 162.8, 108.5, 87.4 and 31.1 eggs/female, and average<br />longevities 99.5, 84.7, 69.5, 61.1, 49.6 and 30.1 days, respectively.<br />The net reproductive rates (R.) were 8.0, 32.2, 60.7, 32.6, 20.7<br />and 2.6 females/female, and the intrinsic rates of increase (r(m))<br />0.014, 0.041, 0.083, 0.086, 0.077 and 0.024 females/female/day, respectively.<br />The average total fecundities of N. bisignatus at 15, 20, 25, 30<br />and 32.5 degrees C were 54.7, 72.1, 96.9, 56.0 and 22.8 eggs/female,<br />and average longevities 116.1, 108.7, 71.8, 68.8 and 43.7 days, respectively.<br />The net reproductive rates (R.) were 13.9, 26.4, 31.3, 15.2 and 3.6<br />females/female and the intrinsic rates of increase (r(m)) were 0.017,<br />0.035, 0.060, 0.051 and 0.024 females/female/day, respectively. The<br />survival of females at each temperature was fitted using a Weibull<br />distribution [S-(t) = e-((1/b)c)]. Furthermore two mathematical models<br />[Enkegaard equation: F = (a + b + x).e((c+d.x)), Analytis equation:<br />F=a.(x-x(min))(n).(x(min)-x)(m)] were fitted to the fecundity data

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Kontodimas, D. C., Milonas, P. G., Stathas, G. J., Economou, L. P., & Kavallieratos, N. G. (2007). Life table parameters of the pseudococcid predators Nephus includens and Nephus bisignatus (Coleoptera: Coccinelidae). European Journal of Entomology, 104(3), 407–415. https://doi.org/10.14411/eje.2007.060

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