Effects of crowding on populations of Aedes albifasciatus larvae under laboratory conditions
Effects of crowding on populations of Aedes albifasciatus larvae under laboratory conditions
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DOI：
10.1046/j.1570-7458.2000.00651.x
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发表时间：
2000-05
影响因子：
1.9
通讯作者：
R. M. Gleiser;J. Urrutia;D. Gorla
中科院分区：
文献类型：
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作者：
R. M. Gleiser;J. Urrutia;D. Gorla
白斑伊蚊(Aedes (Ochlerotatus) albifasciatus (Macquart 1838))（双翅目：库蚊科）是一种新热带洪水蚊子，被认为是西部马脑炎病毒的主要媒介，影响阿根廷中部的牛肉和牛奶生产。从卵到成虫的孵化和发育所需的时间很短，通常在临时池中，这表明一种允许利用临时池的策略，从而逃避捕食和种间竞争。在这些条件下，种内竞争可能是幼虫死亡的主要密度依赖性来源，但蚊子种群密度依赖性调节的相对重要性引起了争议。因此，我们研究了幼虫密度对伊蚊基本种群特征的影响。实验室里的白腹鱼。幼虫由困在野外的雌虫产卵同步孵化获得。用初生幼虫（L1）建立不同初始密度的队列，将其保存在装有400 ml蒸馏水的塑料托盘中，并在前10天每天提供食物（每只幼虫0.1 g day - 1）。通过线性和非线性回归及相关分析，估计了年龄特异性发育时间、特异性和相对死亡率，并评估了它们与初始幼虫密度的关系。第一次孵化是在淹卵3小时后登记的。在密度较高的组中检测到较高的成年前死亡率。特异性死亡率和进入L1 ~ L3期的平均时间与初始幼虫密度有直接关系，而L4期与蛹密度无显著关系。结果表明，拥挤可能是调节伊蚊自然种群密度的一个因素。albifasciatus。
Aedes (Ochlerotatus) albifasciatus (Macquart 1838) (Diptera: Culicidae) is a neotropical flood water mosquito, incriminated as the main vector of the western equine encephalitis virus, and which affects beef and milk production in central Argentina. The short time required to hatch and develop from egg to adult, usually in temporary pools, suggests a strategy which allows for exploitation of transient pools, thus evading predation and interspecific competition. Under these conditions intra specific competition could represent a major density‐dependent source of larval mortality, but the relative importance of density‐dependent regulation of mosquito populations has generated controversy. Therefore we examined the effects of larval density on basic population characteristics of Ae. albifasciatus in the laboratory. Larvae were obtained by synchronous hatching of eggs laid by field‐trapped females. Emerging larvae (L1) were used to build cohorts of different initial densities, kept in plastic trays with 400 ml of distilled water, and food supplied daily during the first 10 days (0.1 g per larvae day−1). Age‐specific development time and specific and relative mortality were estimated, and their relation to initial larval density was assessed through linear and non‐linear regressions and correlation analysis. First hatching was registered 3 h after flooding the eggs. Higher levels of pre‐adult mortality were detected in groups with higher densities. Specific mortality and average time to enter a stage of L1 to L3 could directly be related to initial larval density, but no significant relations were found for L4 and pupae. Results suggest that crowding could be a factor capable of regulating the density of natural populations of Ae. albifasciatus.