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首页> 外文期刊>Polar biology >Responses of orb-weaving spider aggregations to spatiotemporal variation in lake-to-land subsidies at Lake Myvatn, Iceland
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Responses of orb-weaving spider aggregations to spatiotemporal variation in lake-to-land subsidies at Lake Myvatn, Iceland

机译：冰岛米湖Lake-to-land蜘蛛球聚集体对时空变化的响应

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摘要

Tundra ecosystems are often unproductive, and peaks in resource availability are highly variable in space and time. Therefore, the success of organisms inhabiting these biomes likely depends on their ability to efficiently exploit heterogeneously distributed resources. We assessed how orb-weaving spider ( Larinioides patagiatus ) aggregations near Lake Mývatn, Iceland, respond to large midge (Diptera: Chironomidae) emergences that subsidize ecological communities in the surrounding landscape. The emergences occur for only a few weeks each summer, and the subsidy declines with distance from the lakeshore, producing large spatiotemporal variation in prey availability that might drive orb-weaver foraging behavior. We conducted three surveys during different phases of the summer emergence along a distance gradient to quantify variation in spider aggregation, web size, and habitat use in response to prey abundance. We found that aggregation size increased with the abundance of aerial prey, with the highest orb-weaver densities occurring at peak midge emergence. In contrast, changes in web size did not vary with midge abundance, but rather were determined by physical habitat structure. Our results illustrate how orb-weaver aggregations and web building can respond to spatiotemporal variation in resource subsidies across ecosystem boundaries.
机译：苔原生态系统通常没有生产力，资源可用性的高峰在空间和时间上变化很大。因此，居住在这些生物群落中的生物的成功可能取决于它们有效利用异构分布资源的能力。我们评估了冰岛米湖附近的编织蜘蛛（Larinioides patagiatus）聚集体如何响应大型蚊（Diptera：Chironomidae）的出现，这些出现为周围景观的生态群落提供了补贴。每年夏季仅出现几个星期，并且补贴随着距湖岸距离的增加而下降，导致猎物可利用性的时空变化很大，这可能会导致天体织布机的觅食行为。我们在夏季出苗的不同阶段沿着距离梯度进行了三项调查，以量化蜘蛛聚集，网幅大小和栖息地利用对猎物丰富度的变化。我们发现，聚集体的大小随空中猎物的增加而增加，最高的球-织布工密度出现在高峰蚊的出现。相反，网幅大小的变化并没有随着蚊虫的丰富度而变化，而是由自然栖息地的结构决定的。我们的结果说明了天体编织者聚集和网站建设如何响应跨生态系统边界的资源补贴的时空变化。

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