【摘要】 为了鉴别大草蛉(Chrysopa Septempunctata Wesmael)成虫搜索捕食行为转换的激发因子,测定地域集中型搜索时间(GUT),用下述五种不同刺激处理:a)和蚜虫接触;b)咬住蚜虫但不让它取食;C)吃下一头蚜虫;d)和琼脂块接触;e)摄食沾有蚜虫体液的伪食饵;f)不给予食饵刺激;在装置内停留一分钟。结果发现,和食饵接触而不让它取食即可激发搜索行为转换。同时发现GUT随不同刺激程度而变化(d≠a<b<e<c);GUT与取食不同大小的食饵相关。为了辨别GUT由摄食量还是食饵大小所决定,分别给予先低龄后高龄和先高龄后低龄若蚜两种不同顺序让大草蛉取食,但总摄食量相同,结果表明,GUT大小由最后一个食饵的大小所决定。更多还原

【Abstract】 To identify the exciting factors for switching the searching behavior of Chrysopa septempuntus Wesmael, the duration of area-concentrated search (GUT:giving up time)was determined by the method described by Nakamuta (1982) after each of the 5 feeding stimuli was provided: (a) touching an aphid (Aphis gossypii Glover); (b) holding an aphid at mouthparts but not letting it eaten; (c)consuming an aphid; (d) contacting with an agar block (ca. 2×2×2mm); (e)consuming an agar block with a droplet of aphid body fluid on it; (f)Staying in the installation for a minute. Switchover in searching behavior was observed in every case. The result shows that contacting with a prey rather than consuming it is the factor that excites the switchover of searching behavior. We also found that the GUT varied with the feeding stimulus (d≈<a<b<e<c). The GUT was positively correlated with feeding time of an aphid which represented the size of the consumed prey. To distiguish whether the GUT was controlled by the amount or by the size of prey consumed, the GUT was measured after Chrysopa septempuntus had fed successively on a large and a small aphid and after it had fed on a small one followed by a large one. The time of the former is longer than that of the later after having consumed the same amount of aphids in varied order, and so we can conclude that the GUT is determined by the size of the prey consumed.更多还原