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首页> 外文期刊>Pedobiologia >Wandering spiders limit densities of a major microbi-detritivore in the forest-floor food web
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Wandering spiders limit densities of a major microbi-detritivore in the forest-floor food web

机译：游走的蜘蛛限制了森林地板食物网中主要微生物的密度

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In a long-term field experiment, densities of wandering spiders (i.e. species that do not build webs to capture prey) were reduced in order to determine whether or not a major group of microbi-detritivores, the Collembola (springtails), would increase in response to lowered spider predation. Thirty 4-m~2 fenced plots (15 spider-removal, 15 control plots) and 15 unfenced, undisturbed reference areas were established in a deciduous forest. Spiders were taken from the removal-treatment after being collected by periodic trapping with pitfall traps that contained no preservative, and by searching the litter surface. Judging from a comparison of the numbers captured during periodic censuses in spider-removal and control plots (one census period was two consecutive days of pitfall trapping), wandering spiders were rapidly reduced by ca. 50% and were maintained at levels lower than control plots for 1.3 years. The reduction in numbers was greatest for wolf spiders (Lycosidae; ≈ 90%). Of six families of Collembola abundant in the leaf litter during the experiment, one family, the Tomoceridae, exhibited a significant release from spider predation. Densities of tomocerids, which are the largest and most active springtails on the research site, gradually increased until they were consistently 2 * higher in the spider-removal treatment than in either fenced control plots or unfenced, open reference areas.
机译：在一项长期的野外实验中，降低了游走蜘蛛的密度（即那些没有建立网状结构以捕获猎物的物种），以确定主要的微生物破坏群Collembola（跳尾）是否会增加。对降低蜘蛛捕食的反应。在落叶林中建立了30个4-m〜2的栅栏样地（去除蜘蛛网15个，控制样地15个）和15个不受保护，不受干扰的参考区域。通过定期诱捕不包含防腐剂的陷阱陷阱并搜索垃圾表面，将蜘蛛从去除处理中取出。通过比较定期清除蜘蛛和控制地块（一次普查期间是连续两天的陷阱陷阱）中捕获的数量，一个徘徊的蜘蛛被迅速减少了大约。 50％，并保持低于对照样地的水平1.3年。狼蜘蛛的数量减少最大（狼科;≈90％）。在实验期间，在叶子凋落物中丰富的六个Collembola家族中，一个家族（Tomoceridae）表现出了从蜘蛛捕食中的大量释放。杀鼠尾的密度是研究场所中最大，最活跃的跳尾，其密度逐渐增加，直到在去除蜘蛛的过程中它们比围栏控制地块或无围栏的开放参考区域的刺尾密度始终高出2倍。

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