The significance of ratios of detritus types and micro-organism productivity to competitive interactions between aquatic insect detritivores.
The significance of ratios of detritus types and micro-organism productivity to competitive interactions between aquatic insect detritivores.
复制标题
碎屑类型和微生物生产力的比率对水生昆虫碎屑动物之间竞争相互作用的意义。
DOI：
10.1111/j.1365-2656.2007.01297.x
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Juliano,StevenA
中科院分区：
文献类型：
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作者：
Yee,DonaldA;Kaufman,MichaelG;Juliano,StevenA
竞争相互作用的调查强调非碎屑资源，即使碎屑是大多数食物网的主要组成部分。竞争物种的研究通常集中在单一的资源类型，虽然消费者在自然界中可能会遇到混合的资源类型，可能会影响到是否竞争的结果是排斥或共存。白纹伊蚊在实验室和野外微生态系统中对单一碎屑类型的竞争中能够排除本地蚊子Ochlerotatus triseriatus。在这项研究中，我们使用了9个比例的两个碎屑类型（动物和树叶）常见的天然容器，以测试碎屑比例是否影响竞争的结果。在种内和种间竞争下，A.白纹伊蚊的存活率和估计种群增长率均高于O.三列的与过去的研究不同，这两个物种都有积极的增长和高成人生存，几乎没有竞争效应的证据，在一个资源比（10：1的比例叶：动物碎屑），无论蚊子的密度，这表明潜在的共存。通径分析表明，幼虫密度对种群增长有负效应。triseriatus，而A.白纹伊蚊具有竞争优势。白纹伊蚊这两个物种的人口增长的影响强烈的直接路径从动物（阳性）和叶（阴性）碎屑，和叶碎屑通过细菌生产（阳性）的间接影响。现场采样建立，碎屑进入真实的树洞的比例类似于我们的实验，这表明碎屑比例的自然变化可能会影响这些物种的当地共存。植物和动物碎屑的比例的季节性变化表明，时间和空间的变化输入可能是重要的潜在共存。
Investigations of competitive interactions emphasize non-detrital resources, even though detritus is a major component of most food webs. Studies of competing species focus usually on single resource types, although consumers in nature are likely to encounter mixtures of resource types that may affect whether competition results in exclusion or coexistence. The invasive mosquito Aedes albopictus is capable of excluding the native mosquito Ochlerotatus triseriatus in competition for single detritus types in laboratory and field microcosms. In this study, we used nine ratios of two detritus types (animal and leaf) common in natural containers to test whether detritus ratios affect the outcome of competition. Under intraspecific and interspecific competition, A. albopictus attained higher survival and estimated population growth rate than did O. triseriatus. Unlike past studies, both species had positive growth and high adult survival, with little evidence of competitive effects, under one resource ratio (10:1 ratio of leaf:animal detritus) regardless of mosquito densities, suggesting potential coexistence. Path analysis showed that densities of larvae had negative effects on population growth for O. triseriatus but not for A. albopictus, indicating competitive superiority of A. albopictus. Population growth of both species was affected strongly by the direct paths from animal (positive) and leaf (negative) detritus, and the indirect effect of leaf detritus via bacterial production (positive). Field sampling established that detritus entered real tree holes in ratios similar to those in our experiment, suggesting that natural variation in detritus ratios may influence local coexistence of these species. Seasonal variation in ratios of plant and animal detritus indicated that temporal as well as spatial variation in inputs may be important for potential coexistence.