Escape from gregarine parasites affects the competitive interactions of an invasive mosquito.
Escape from gregarine parasites affects the competitive interactions of an invasive mosquito.
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DOI：
10.1023/a:1020933705556
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发表时间：
2002-01-01
影响因子：
2.9
通讯作者：
Juliano, Steven A.
中科院分区：
文献类型：
--
作者：
Aliabadi, Brianna W.;Juliano, Steven A.
当一个物种被引入一个新的地方，它可能会逃离，至少是暂时的，从它的天敌。在实地调查中，我们发现，当外来的，入侵的蚊子，白纹伊蚊，入侵新的网站，它最初的经验减少感染其肠道寄生虫，Ascogregarina taiwanensis。为了确定这种逃避寄生对A.白纹伊蚊（A. albopictus）进行了室内竞争实验。白纹伊蚊幼虫单独在微生态系统中饲养，并与本地蚊子Ochlerotatustriseriatus的幼虫竞争。分析了A. taiwanensis对A.白纹伊蚊的表现时，受到内部和种间竞争的幼虫密度范围内，以及A。白纹伊蚊A. taiwanensis对A. albopictus在O.三列的在密度为30 O. triseriatus幼虫、O.添加30个未感染的A.白纹伊蚊，但不增加30个感染的A. albopictus，而不是通过添加15 A.白纹伊蚊，不论是否感染。虽然估计的种群有限增长率（Efda '）显示出类似的趋势，并受到处理的显著影响，但增长率的成对差异不显著。感染A. taiwanensis也显著延长了A.白纹伊蚊雌蚊发育时间的延长，降低了密度增加对种内竞争的影响。albopictus，但不影响A.白纹伊蚊存活率、质量或估计的有限种群增长率。因此，当A.当白纹伊蚊在新的地点定居时，它会从这种寄生虫中逃脱，这种逃脱可能会给它一个小的，但重要的，比O. triseriatus，这可能有助于A. albopictus和增强A.白纹伊蚊对当地物种的最初影响
When a species is introduced into a new location, it may escape, at least temporarily, from its natural enemies. In field surveys, we found that when the exotic, invasive mosquito, Aedes albopictus, invades new sites, it initially experiences reduced infection by its gut parasite, Ascogregarina taiwanensis. To determine the effect of this escape from parasitism on the competitive ability of A. albopictus, we performed a laboratory competition experiment in which infected and uninfected A. albopictus larvae were reared in microcosms alone and in competition with larvae of the native mosquito, Ochlerotatus triseriatus. We analyzed the effect of parasitism by A. taiwanensis on A. albopictus performance when subjected to intra- and interspecific competition across a range of larval densities, as well as the effect of A. albopictus parasitism by A. taiwanensis on the competitive impact of A. albopictus on O. triseriatus. At a density of 30 O. triseriatus larvae, O. triseriatus survivorship was significantly reduced by the addition of 30 unifected A. albopictus, but not by addition of 30 infected A. albopictus, and not by addition of 15 A. albopictus whether infected or uninfected. Although estimated finite rate of population increase (lambda') showed similar trends, and was significantly affected by treatments, no pairwise differences in rate of increase were significant. Infection by A. taiwanensis also significantly prolonged A. albopictus female development time and reduced the intraspecific competitive effect of increased density of A. albopictus, but did not affect A. albopictus survivorship, mass, or estimated finite rate of population increase. Thus, when A. albopictus escapes from this parasite as it colonizes new sites, this escape may give it a small, but significant, added competitive advantage over O. triseriatus, which may facilitate range expansion of A. albopictus and enhance A. albopictus's initial impact on resident species.