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首页> 外文期刊>African Entomology >Effects of seed availability on egg distribution patterns and larval survival in Acanthoscelides macrophthalmus (Chrysomelidae: Bruchinae), a seed-feeding biological control agent of Leucaena leucocephala (Fabaceae) in South Africa.
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Effects of seed availability on egg distribution patterns and larval survival in Acanthoscelides macrophthalmus (Chrysomelidae: Bruchinae), a seed-feeding biological control agent of Leucaena leucocephala (Fabaceae) in South Africa.

机译：种子可利用性对大果白头翁（Fabaceae）的种子饲喂生物防治剂大叶棘（Acanthoscelides macrophthalmus，Chrysomelidae：Bruchinae）的卵分布模式和幼虫存活的影响。

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A laboratory experiment was conducted to study the fecundity and longevity of A. macrophthalmus females from Kwazulu-Natal, the oviposition responses to varying degrees of availability of L. leucocephala seeds, and the effect of varying egg loads on seeds on larval survival to adulthood. Female adults that were not provided food and water lasted 14-24 days at 24 degrees C. Eighteen percent of the females did not oviposit, whereas the remaining females each produced 4-39 eggs. Of all the deposited eggs, 43.8% were deposited singly on seeds and 11.2% were deposited on petri dishes. In cases of multiple oviposition, eggs were deposited on aggregates of 2, 3 and 4-6 eggs. The high proportion of unexploited seeds, the incidence of multiple oviposition, and the oviposition on petri dishes suggested an egg dumping behaviour. The pattern of egg distribution was affected by seed availability. At the lowest seed density (2 seeds per female), a higher number of seeds with egg loads of >3 eggs was recorded. At a density of 4 seeds per female, the number of eggs on seeds varied from 0 to >3 eggs. At a density of 8 seeds per female, significant differences were recorded only between the proportions of seeds with no eggs and the proportions of seeds with >3 eggs. At the highest seed density (16 per female), a higher proportion of seeds had no eggs. A highly significant negative correlation was observed between the percentage of adult emergence and the number of eggs per seed. Larval survival to adulthood was greatest (97.0%) in seeds with single egg loads and lowest (1.0%) in seeds with a load of 10 eggs.
机译：进行了一项室内实验，研究了夸祖鲁-纳塔尔省大眼石楠雌虫的繁殖力和寿命，对白头翁种子可用性不同程度的排卵反应，以及不同蛋量对种子对幼虫成活率的影响。不提供食物和水的成年雌性在24摄氏度下可持续14-24天。百分之十八的雌性不产卵，而其余雌性则各自产4-39个卵。在所有沉积的卵中，有43.8％的卵单独沉积在种子上，有11.2％的卵沉积在培养皿上。在有多个产卵的情况下，卵沉积在2、3和4-6个卵的聚集体上。未利用的种子比例高，发生多次排卵和在培养皿上排卵都表明有抛蛋行为。卵的分布方式受种子供应量的影响。在最低种子密度（每只雌性2颗种子）下，记录到更多的种子，其卵载量大于3个卵。以每只雌性4个种子的密度，种子上的卵数从0到> 3个卵不等。在每只雌性8粒种子的密度下，仅在没有卵的种子比例与具有> 3个卵的种子比例之间记录到显着差异。在最高种子密度下（每雌16），较高比例的种子没有卵。在成年出苗率和每个种子的卵数之间观察到高度显着的负相关。单个卵负荷种子的成虫幼虫存活率最高（97.0％），而10个卵负荷种子的幼虫存活率最低（1.0％）。

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