Growth in arthropods in general and in insects in particular, is supposed to be discontinuous and occurs during moulting. In Culicidae in general and <i> <i><span style="font-family:Verdana;"&...Growth in arthropods in general and in insects in particular, is supposed to be discontinuous and occurs during moulting. In Culicidae in general and <i> <i><span style="font-family:Verdana;">Anopheles</span></i></i><span style="font-family:Verdana;"> in particular, the number of moults is five with the fourth which gives the pupae. It is known that moulting in insects is a genetic and physio</span><span><span style="font-family:Verdana;">logical phenomenon. Most physiological reactions are triggered by chemical or physical stimuli. The pressure exerted by the growth of the larval body on the exocuticle is one of the triggers of moulting. The objective of this work was therefore to determine the exact timing of the first three moults that determine the growth of <i></i></span><i><i><span style="font-family:Verdana;">An. gambiae</span></i></i></span><span style="font-family:Verdana;"> larvae from egg hatch to pupation to highlight the role of increased larval size in the stimulation of moulting. We therefore, undertook to rear larvae of this anopheline species</span><i> </i><span style="font-family:Verdana;">in the laboratory under conditions close to their natural environment from hatching to pupation. The length and width of the head, thorax and abdomen were recorded daily. Data analysis showed that the size of the head and thorax remained constant for the first three days (D0 to D2) of development and ab</span><span style="font-family:Verdana;">domen’s length for the first two days and then increased daily until day seven (D7) when it stopped. These observations led us to say that the M1 moult occurs at end of the third day of development and the M3 moult at end of the eighth day;the M2 moult could not be determined. All these observations led </span><span><span style="font-family:Verdana;">to the conclusion that the larval growth of <i> </i></span><i><i><span style="font-family:Verdana;">An. gambiae</span></i></i></span><span style="font-family:Verdana;"> has a continuous</span><span style="font-family:Verda展开更多
文摘Growth in arthropods in general and in insects in particular, is supposed to be discontinuous and occurs during moulting. In Culicidae in general and <i> <i><span style="font-family:Verdana;">Anopheles</span></i></i><span style="font-family:Verdana;"> in particular, the number of moults is five with the fourth which gives the pupae. It is known that moulting in insects is a genetic and physio</span><span><span style="font-family:Verdana;">logical phenomenon. Most physiological reactions are triggered by chemical or physical stimuli. The pressure exerted by the growth of the larval body on the exocuticle is one of the triggers of moulting. The objective of this work was therefore to determine the exact timing of the first three moults that determine the growth of <i></i></span><i><i><span style="font-family:Verdana;">An. gambiae</span></i></i></span><span style="font-family:Verdana;"> larvae from egg hatch to pupation to highlight the role of increased larval size in the stimulation of moulting. We therefore, undertook to rear larvae of this anopheline species</span><i> </i><span style="font-family:Verdana;">in the laboratory under conditions close to their natural environment from hatching to pupation. The length and width of the head, thorax and abdomen were recorded daily. Data analysis showed that the size of the head and thorax remained constant for the first three days (D0 to D2) of development and ab</span><span style="font-family:Verdana;">domen’s length for the first two days and then increased daily until day seven (D7) when it stopped. These observations led us to say that the M1 moult occurs at end of the third day of development and the M3 moult at end of the eighth day;the M2 moult could not be determined. All these observations led </span><span><span style="font-family:Verdana;">to the conclusion that the larval growth of <i> </i></span><i><i><span style="font-family:Verdana;">An. gambiae</span></i></i></span><span style="font-family:Verdana;"> has a continuous</span><span style="font-family:Verda
