Studies on regulatory mechanism of spinning bahavior in the silkworms.

为了阐明蚕茧形成行为的调控机制，用三维计算机图形学方法对家蚕和天蚕的行为特征进行了分析。“还研究了血淋巴蜕皮激素水平与纺纱行为的关系。”纺纱过程由两台摄像机记录下来。根据三维数据，分析了幼虫体型、吐丝面积、吐丝速度和伸展行为频率的系列变化。研究结果表明：(1)在结茧的底座和骨架的收缩过程中，纺丝区域的大小迅速减小，然后缓慢收敛到最终的蚕茧尺寸；(2)幼体形状的连续变化可以用合适的二元自回归模型来描述；(3)拉伸行为是花生型蚕茧中央出现收缩部分的原因之一。机械…可以实验改变蚕茧的形状贴上医用胶带对节段运动的更典型的抑制；绑在第5节幼虫上的幼虫结成圆形的茧，而绑在后节(7-10节)上的幼虫结出更长的茧。3DCG分析显示，捆绑治疗对后半身的弯曲角度和固定有影响。研究还发现，卷绕处理后，纺丝速度明显下降。此外，摘胶处理延长了吐丝期，从而延缓了化蛹。血淋巴蜕皮激素水平显著低于对照组，提示捆扎影响了脑-翼体-前胸腺轴的分泌活动。红薯天牛在最后一龄末在土壤中形成一个蛹室。用红外摄像系统研究了家蚕的行为特征，并建立了最后一龄幼虫的发育时间表，与家蚕的吐丝行为进行了比较。较少

To clarify regulation mechanism of spinning and cocoon formaiton behavior, behavioral characteristics of the silkworms (Bombyx mori and Antheraea yamamai) were analized by 3D-computer graphics. 'Relationships between hemolymph molting hormone level and spinning behavior were also investigated.1. Spinning process was recorded by two video cameras. Based on the three dimentional data, serial changes of larval body shape, spinning area, spinning speed and frequency of streching behavior were analized. The results obtained were as follows ; (1) the size of spinning region reduces quickly during the constraction of base and frame for cocooning, and then slowly converge it to the final cocoon size, (2) serial shape changes of larval body can be represented by an appropriate bivariate autoregressive model, (3) streching behavior is one of responsible factors for the appearance of constricted parts in the center of a peanut-shape cocoon.2. Cocoon shape can be changed experimentally by the mech … More anical inhibition of segmental movement by attaching a piece of medical tape ; a larva taped on the 5th larval segment made a round cocoon, while the one taped on the posterior segment (7-10th segment) spun a longer cocoon. The 3DCG analysis showed that the taping treatment affects the bending angle and the fixation of the posterior half of the body. It was also found that spinning speed shows down significantly after the taping treatment. Moreover, taping treatment prolonged spinning period, and consequently delayd pupation. The hemolymph ecdysteroid level was significantly lower than the control, suggesting that the taping affects secretory activity in the brain-corpora allata-prothoracic gland axis.3. The sweet potato hornworm, Agrius convolvuli, make a pupal room in the soil at the end of the last instar. Characteristics of the behavior was also studied by using an infrared camera-Video recorder system, and a developmental time-table was established for the last larval instar to compare with the spinning behavior of the silkworms. Less