Attention focusing in a sit-and-wait forager: a spider controls its prey-detection ability in different web sectors by adjusting thread tension
Attention focusing in a sit-and-wait forager: a spider controls its prey-detection ability in different web sectors by adjusting thread tension
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DOI：
10.1098/rspb.2009.1583
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发表时间：
2010-01-07
影响因子：
4.7
通讯作者：
Nakata, Kensuke
中科院分区：
文献类型：
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作者：
Nakata, Kensuke
集中注意力是动物有效地寻找和获得食物的一种方式。本研究探讨了是否坐着等待觅食，圆网蜘蛛Cyclosa tuberculata，将其注意力集中在有限的觅食区域。搜寻活动的视频记录显示，蜘蛛发现被困在其网络的西部和东部部门的猎物比被困在北部和南部部门的猎物更少。比较有和没有蜘蛛的网络中心区域的照片显示，蜘蛛在等待猎物时会将半径拉向中心。半径拉力在北、南腹板扇区比在西、东腹板扇区更强，这可能导致垂直运行的半径更大的张力。实验操作表明，蜘蛛对猎物的反应更快时，线程张力增加。结果表明，C.瘤腹蛛通过调整蛛丝张力，将注意力集中在蜘蛛上下的蛛网区域，这使得这些区域的猎物发现率更高。
Focusing attention is a way for animals to search for and to obtain food efficiently. This study examines whether a sit-and-wait forager, the orb-web spider Cyclosa octotuberculata, focuses its attention on limited foraging areas. Video records of foraging activity revealed that the spiders detected prey trapped in the west and east sectors of their web less frequently than prey trapped in the north and south sectors. Comparison of photos of the web hub area with and without spiders present revealed that the spiders pulled radii towards the centre when waiting for prey. Radius pulling is stronger in the north and south web sectors than in the west and east sectors, possibly causing more tension in radii running vertically. Experimental manipulation indicated that the spiders responded to prey quicker when thread tension was increased. The results suggest that C. octotuberculata focus their attention on the web areas above and below the spider by adjusting the tension in web threads; and this causes higher prey detection rates in these areas.