Water harvesting during orb web recycling
Water harvesting during orb web recycling
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DOI：
10.1636/joa-s-19-066
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发表时间：
2021-02
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影响因子：
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通讯作者：
B. Opell
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文献类型：
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作者：
B. Opell
抽象的。在构建一个圆网之前，一只蜘蛛取下并吞下前一天的网。夜行性物种在傍晚或清晨这样做，而昼行性物种在清晨这样做，这是一天中相对湿度（RH）高的时候。在这些条件下，蜘蛛网上粘滞的猎物捕捉线上的吸湿胶滴会吸引大气中的水分，从而在蜘蛛吞食它的网时提供净水分。蜘蛛网回收的贡献，蜘蛛的水预算已估计，但没有经验确定。本研究对四个物种的成年雌性（Araneus marmoreus Clerck，1757，Argiope trifasciata（Forskål，1775），Leucauge venusta（Walckenaer，1841）和Micrathena gracilis（Walckenaer，1805））进行了研究，首先确定了在20%和37%RH下网胶滴的总体积，以估计在构建过程中网中投入的水。在90%RH下从幅材的总液滴体积中减去这些值中的每一个接近于当幅材再循环时收集的水的范围。高估计的净水获得范围从0.45%的蜘蛛的身体质量（3.01微升的水获得）在A。真姬菇的0.88%体重（0.19 µl增水）。venusta。以. tribasciata的蜘蛛网，当一个网被摄取时获得的水相当于蜘蛛每天蒸发掉的水的29%。
Abstract. Before constructing an orb web, an araneoid spider takes down and ingests the previous day's web. Nocturnal species do this either during the early evening or in the early morning and diurnal species during the early morning, times of the day when relative humidity (RH) is high. Under these conditions the hygroscopic glue droplets of a web's viscous prey capture thread attract atmospheric moisture, providing a net gain of water when a spider ingests its web. The contribution of web recycling to a spider's water budget has been estimated, but not determined empirically. This study does so for adult females of four species (Araneus marmoreus Clerck, 1757, Argiope trifasciata (Forskål, 1775), Leucauge venusta (Walckenaer, 1841), and Micrathena gracilis (Walckenaer, 1805)) by first determining the total volume of a web's glue droplets at 20% and 37% RH to estimate the water invested in web during construction. Subtracting each of these values from the web's total droplet volume at 90% RH approximates the range of water harvested when the web is recycled. High estimates of the net water gained range from 0.45% of a spider's body mass (3.01 µl water gained) in A. marmoreus to 0.88% of body mass (0.19 µl water gained) in L. venusta. In A. trifasciata, the water gained when a web is ingested is equivalent to 29% of a spider's daily evaporative water loss.