A field test for competitive effects of Aedes albopictus on A-aegypti in South Florida:: differences between sites of coexistence and exclusion?
A field test for competitive effects of Aedes albopictus on A-aegypti in South Florida:: differences between sites of coexistence and exclusion?
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DOI：
10.1007/s00442-004-1532-4
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发表时间：
2004-05-01
期刊：
影响因子：
2.7
通讯作者：
O'Meara, GF
中科院分区：
文献类型：
--
作者：
Juliano, SA;Lounibos, LP;O'Meara, GF
我们测试了白纹伊蚊的种间竞争是否对A.在南佛罗里达墓地花瓶中发现的典型数量的蚊子幼虫。我们还测试了A. albopictus在A. aegypti在A.埃及伊蚊在入侵后存活下来或灭绝。白纹伊蚊类似的实验操纵A.白纹伊蚊在墓地花瓶中进行了三个地点的A. aegypti的持久性和三个地点A.埃及人显然已经灭绝了。使用由每个地点观察到的幼虫数量确定的幼虫数量，并使用放置在每个田间地点的实验花瓶中积累的资源（叶碎屑）进行实验。在雨季初期（蚊幼虫数量较少）和雨季后期（蚊幼虫数量较多），处理对实验A.埃及人。在雨季后期，当幼虫数量较多时，处理对A.埃及人。而竞争处理×立地类型（A. aegypti persists vs. extremely）的相互作用不显著，表明A. albopictus在A.埃及在持久性地点和灭绝地点之间没有系统的区别。因此，尽管来自A.白纹伊蚊是强大的，在所有网站的现场条件下，我们没有发现任何证据表明，种间竞争的影响的变化与共存或排斥。因此，幼虫之间的种间竞争是一个可行的解释排斥或减少A。aegypti在南佛罗里达，但A.埃及入侵后似乎并不主要是在墓地花瓶的水生环境的条件变化的产物。
We tested whether interspecific competition from Aedes albopictus had measurable effects on A. aegypti at the typical numbers of larval mosquitoes found in cemetery vases in south Florida. We also tested whether the effect of interspecific competition from A. albopictus on A. aegypti differed between sites where A. aegypti either persists or went extinct following invasion by A. albopictus. Similar experiments manipulating numbers of A. albopictus in cemetery vases were conducted at three sites of A. aegypti persistence and three sites where A. aegypti was apparently extinct. The experiments were done using numbers of larvae that were determined by observed numbers of larvae for each site, and with resources (leaf detritus) that accumulated in experimental vases placed into each field site. In both the early rainy season (when number of mosquito larvae was low) and the late rainy season (when number of mosquito larvae was high), there was a significant effect of treatment on developmental progress of experimental A. aegypti. In the late rainy season, when numbers of larvae were high, there was also a significant effect of treatment on survivorship of A. aegypti. However, the competition treatment x site type (A. aegypti persists vs extinct) interaction was never significant, indicating that the competitive effect of A. albopictus on A. aegypti did not differ systematically between persistence versus extinction sites. Thus, although competition from A. albopictus is strong under field conditions at all sites, we find no evidence that variation in the impact of interspecific competition is associated with coexistence or exclusion. Interspecific competition among larvae is thus a viable explanation for exclusion or reduction of A. aegypti in south Florida, but variation in the persistence of A. aegypti following invasion does not seem to be primarily a product of variation in the conditions in the aquatic environments of cemetery vases.