Abstract
A series of experiments were conducted to compare the susceptibility of P. regina larvae reared in isolation or in groups to the effects of diet-borne metabolic inhibitors: chlorogenic acid (CGA) and mimosine. Larvae were presented with diets containing 0.4 mM CGA or 0.4 mM CGA in combination with 22 mM lysine or methionine or with diets containing 1.5, 15 or 30 mM concen- trations of mimosine. Methionine and CGA caused significantly reduced pupal weights when compared with larvae presented with lysine and CGA. All concentrations of mimosine resulted in 100% mortality with larvae unable to successfully complete pupation even at the lowest concentration. In general, larvae reared in groups were less susceptible to the toxic effects resulting from diet- borne metabolic inhibitors. The results are discussed in relation to the chemical factors that result from the feeding activity of saprophagous dipterans.
Highlights
Alteration to the nutrient levels in the diet of Phormia regina (Meigen) (Diptera: Calliphoridae) can affect the development of larvae (Hill et al, 1947; Brust & Fraenkel, 1955; McGinnis et al, 1956)
Inclusion of methionine or lysine in a CAY diet did not affect the pupal weights (WMW, P > 0.05) or mortality (Poisson, P > 0.05) of P. regina larvae relative to a CAY diet control
Diets containing chlorogenic acid (CGA) and CGA in combination with methio nine resulted in reduced pupal weights relative to those larvae presented with a CAY control diet (WMW, P < 0.05)
Summary
Alteration to the nutrient levels in the diet of Phormia regina (Meigen) (Diptera: Calliphoridae) can affect the development of larvae (Hill et al, 1947; Brust & Fraenkel, 1955; McGinnis et al, 1956). If calliphorid larvae do not receive sufficient nutriment they produce smaller larvae, pupae and adults [for example, Lucilia sericata (L.), Daniels et al, 1991 and L. caesar (L.) Okorie and Okoke, 1990]. Metabolic inhibitors, such as CGA, can retard the growth of insect larvae (Kimmins et al, 1995) by interfering with digestion of protein and absorption of the resulting amino-acids (Felton et al, 1992; Stevenson et al, 1993a, 1993b). Larvae reared upon diets containing metabolic inhibitors were compared with those reared upon diets without metabolic inhibitors
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