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首页> 外文期刊>Limnology >Effect of current velocity and case adaptations on the distribution of caddisfly larvae (Glossosoma, Trichoptera)
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Effect of current velocity and case adaptations on the distribution of caddisfly larvae (Glossosoma, Trichoptera)

机译：当前速度和病例适应对on蝇幼虫（Glossosoma，Trichoptera）分布的影响

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In aquatic systems, oxygen availability is often a limiting factor affecting animal distribution. We documented the distribution of case-bearing caddisfly larvae (Glossosoma) in a riffle of the Hirose River, Japan, and found that larval density increased with increasing current velocity. We also experimentally measured the effect of flow and case morphology on oxygen consumption and mortality. Larvae were divided into “perforated” and “closed” case treatment groups where gaps in the upper side of the dome-shaped case were left open or closed. They were placed in either lotic or lentic conditions. Oxygen consumption was higher in the lotic compared to the lentic environment for both groups, and was higher in individuals of the perforated-case group than in those belonging to the closed-case group in both environments. Larval mortality was lower under lotic conditions than lentic conditions for the perforated-case group, and higher in the closed-case group in both environments. Our results suggest that larvae prefer areas with high current velocity as they are otherwise unable to obtain sufficient oxygen because of their lack of undulatory behavior. Furthermore, gaps in the larval case appear to enhance passive gaseous exchange via water flow. We also discuss the functional significance of the glossosomatid case.
机译：在水生系统中，氧气的利用率通常是影响动物分布的限制因素。我们记录了在日本广濑河的浅滩中带壳cad蝇幼虫（Glossosoma）的分布，发现幼虫密度随电流速度的增加而增加。我们还通过实验测量了流量和案例形态对氧气消耗和死亡率的影响。幼虫分为“穿孔的”和“封闭的”病例治疗组，在这些病例中，圆顶形病例的上侧的缝隙保持敞开或闭合。他们被置于抽风或透镜状态。两组相比，在洗液中的耗氧量均高于透镜透镜环境，并且穿孔病例组的个体耗氧量均高于封闭病例组中的耗氧量。在两种情况下，穿孔情况组的幼虫死亡率在抽签条件下均低于透镜透镜条件，而封闭情况下的幼虫死亡率更高。我们的结果表明，幼虫更喜欢流速较高的区域，因为它们缺乏起伏行为，否则无法获得足够的氧气。此外，幼虫情况下的缝隙似乎增强了通过水流进行的被动气体交换。我们还讨论了格索马托案的功能意义。

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