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首页> 外文期刊>Journal of Medical Entomology >Bacterial and fungal biomass responses to feeding by larval Aedestriseriatus (Diptera : Culicidae)
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Bacterial and fungal biomass responses to feeding by larval Aedestriseriatus (Diptera : Culicidae)

机译：细菌和真菌生物量对幼虫Aedestriseriatus（Diptera：Culicidae）摄食的反应

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摘要

We investigated the effect of different densities (0, 20, or 40) of developing larval Aedes triseriatus (Say) on bacterial abundance, bacterial productivity, and leaf fungal biomass in a microcosm experiment. Larvae in the low-density treatment developed normally, but larvae at the high density were significantly slower to develop. Both bacterial abundance (direct microscopic counts) and bacterial productivity (H-3-leucine incorporation rates) on leaf material were significantly lower in the presence of larvae. Bacterial abundance in the water column did not change significantly with treatment, but bacterial productivity varied with time and declined significantly at both larval densities. Bacteria on the walls and bottom of the containers also were less abundant and significantly less productive in the presence of larvae. Aside from presence/ absence effects, there was no clear evidence that larval impacts were density-dependent. Leaf-associated fungal biomass, as measured by ergosterol levels, varied with time but was not significantly affected by any treatment, suggesting most fungal tissue was incorporated in the leaf matrix and unavailable to larvae. Based upon estimated biomass accrual and respiration of larvae, it appears that bacterial biomass and production were insufficient to account for carbon demands of growing larvae. Because fungal biomass and leaf mass likely contributed little to gross larval demands, other carbon sources (e.g., protozoa and extracellular microbial components) were probably used by larvae. Although apparently insufficient for all larval carbon demands, bacterial and leaf fungal biomass may be adequate for other larval nutritional needs (i.e., nitrogen and essential lipids).
机译：在微观世界的实验中，我们研究了不同密度（0、20或40）的发育幼虫伊蚊（Say）对细菌丰度，细菌生产力和叶片真菌生物量的影响。低密度处理中的幼虫发育正常，但高密度处理中的幼虫发育较慢。在存在幼虫的情况下，叶片材料上的细菌丰度（直接显微计数）和细菌生产力（H-3-亮氨酸掺入率）均显着降低。水柱中的细菌丰度没有随处理而显着变化，但细菌生产力随时间变化，并且在两种幼虫密度下均显着下降。在存在幼虫的情况下，容器壁和底部上的细菌也较少，并且生产力明显较低。除了存在/不存在的影响外，没有明确的证据表明幼虫的影响与密度有关。通过麦角固醇水平测量，与叶片相关的真菌生物量随时间变化，但未受到任何处理的显着影响，这表明大多数真菌组织已掺入叶片基质中，而幼虫无法利用。根据估计的生物量积累和幼虫呼吸，看来细菌生物量和产量不足以解决生长中的幼虫的碳需求。由于真菌生物量和叶片质量可能对幼虫总需求的贡献很小，因此幼虫可能使用了其他碳源（例如原生动物和细胞外微生物成分）。尽管显然不足以满足所有幼体碳需求，但细菌和叶片真菌生物量可能足以满足其他幼体的营养需求（即氮和必需脂质）。

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