The effect of prey availability on ovarian development and oosorption in the ladybird beetle Harmonia axyridis (Coleoptera: Coccinellidae)
The effect of prey availability on ovarian development and oosorption in the ladybird beetle Harmonia axyridis (Coleoptera: Coccinellidae)
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DOI：
10.14411/eje.2005.072
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发表时间：
2005-08-15
影响因子：
1.3
通讯作者：
Osawa, N
中科院分区：
文献类型：
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作者：
Osawa, N
在实验室条件下对瓢虫瓢虫的食物丰富或缺乏与卵巢发育或吸收的关系进行了研究。采用4种条件：(1)饱食24 h，(2)饥饿24 h，(3)饥饿48 h，(4)饥饿24 h后再饲喂24 h。体长和初始体重与每只雌性卵巢数无显著相关。两种饥饿条件均显著提高了每只雌虫的吸卵率和卵巢数，显著降低了每只雌虫的成熟卵巢数。饥饿24小时后再饲喂24小时，每只雌性成熟卵巢的比例显著提高；然而，成熟卵巢的比例仍然低于完全饲喂条件。卵吸收主要发生在卵巢发育的中期。掠食性瓢虫的卵巢发育和卵吸收速度比草食性瓢虫快得多。在各试验条件的最后24 h，体长、初始体重和卵巢数与产蛋量呈极显著相关。从每个试验条件的最后24小时内的体重下降和产卵数的分析可以看出，鸡蛋的实际重量可能直接取决于成虫消化食物的量。左右卵巢发育和吸卵不对称。这些可能是水蛭产卵的重要策略，因为在左右卵巢中选择性地提供成熟的卵巢和消化的营养物质有利于它们的发育。此外，卵母细胞发育中期吸收的能量损失小于成熟卵母细胞吸收的能量损失。因此，除了产卵外，卵巢在水蛭体内的另一个作用可能是作为一种能量储存系统，以提高繁殖成功率。在有利的摄食条件下立即开始卵巢发育，在食物缺乏时快速吸收卵子，可能是雌性成虫在异质和波动的资源条件下的适应性产卵和生存策略。
The ladybird beetle Harmonia axyridis Pallas was investigated under laboratory conditions to clarify the relationship between food abundance or scarcity and ovarian development or oosorption. Four conditions were used: (1) fully fed for 24 h, (2) 24-h starvation, (3) 48-h starvation, and (4) 24-h starvation followed by 24-h re-feeding. Body length and initial body weight were not significantly related to the number of ovarioles per female. Both starvation conditions significantly increased the percentage of oosorptive individuals and ovarioles per female, and significantly decreased the percentage of mature ovarioles per female. Refeeding for 24 h after a 24-h starvation resulted in a significantly higher percentage of mature ovarioles per female; however, the percentage of mature ovarioles remained lower than in the fully fed condition. Oosorption mainly occurred during the intermediate developmental stage of the ovarioles. The rates of ovarian development and oosorption in predatory H. axyridis were much faster compared with those in herbivorous ladybird beetles. Body length, initial body weight, and the number of ovarioles were significantly correlated with the number of eggs laid during the last 24 h of each experimental condition. From an analysis of the weight loss and the number of eggs laid during the last 24 h of each experimental condition, it appears that the realized weight of the eggs may be directly determined by the amount of food digested by the adult. The ovarian development and oosorption were asymmetric in the right and left ovaries. These may be important strategies for oviposition in H. axyridis, because selective provision of maturing ovarioles in the right or left ovary with digested nutrients would favor their development. In addition, the energy loss through oosorption during the intermediate developmental stage of oocytes would be less than the energy loss resulting from the resorption of mature oocytes. Therefore, one role of the ovary in H. axyridis, in addition to egg production, might be as a kind of energy storage system for increasing reproductive success. An immediate start of ovarian development under favorable feeding conditions and rapid oosorption during food scarcities may be an adaptive ovipositional and survival strategy for female adults of H. axyridis in response to heterogeneous and fluctuating resource conditions.