Argyrodes Fissifrons Inhabiting Webs of Cyrtophora Hosts: Prey Size Distribution and Population Characteristics
Argyrodes Fissifrons Inhabiting Webs of Cyrtophora Hosts: Prey Size Distribution and Population Characteristics
复制标题
栖息在 Cyrtophora 宿主网中的 Argyrodes Fissifrons：猎物大小分布和种群特征
作者：
Tso IMin;L. Severinghaus
在这项实地研究中，我们调查了Argyrodes fissifrons（蜘蛛目：球蛛科）的影响，两种Cyrtophora蜘蛛主机（蜘蛛目：Araneidae），通过研究其人口和觅食的几个方面。我们研究了（1）A.（2）若A.裂额蚤与特定的寄主形成长期的联结; fissifrons重叠的Cyrtophora主机。野外调查结果表明，平均虫口数与平均虫口数之间存在正相关关系。fissifrons和主机网的大小。A.每个主机Web每天的fissifrons每天变化，表明每天发生的移民-移民事件。然而，从监测中推断，标记为A。裂额龙3个晚上，有些人形成了一个长期的协会与特定的主机。研究了黄腹小蜂的性别比、体尺和摄食量。在监测过程中，留在特定宿主网中的裂额蜘蛛与离开网的裂额蜘蛛没有区别。结果表明，在捕食量分布上，姬小蜂和姬小蜂有显著差异。fissifrons，前者的平均猎物大小远大于后者。这一结果表明A.裂额蚤通过收集被寄主忽视的小猎物而附着在网蛛属寄主的网上。
In this field study we investigated the impact of Argyrodes fissifrons (Araneae: Theridiidae) on two species of Cyrtophora spider hosts (Araneae: Araneidae) by studying several aspects of its population and foraging. We examined (1) if natural population variations of A. fissifrons occur with different web sizes of the hosts, (2) if A. fissifrons form long-term associations with particular hosts, and (3) if the size range of prey consumed by A. fissifrons overlaps with that of Cyrtophora hosts. Results from field surveys indicated that a positive relationship exists between the average number of A. fissifrons and the size of the host webs. The number of A. fissifrons per host web per day changed daily, indicating the daily occurrence of immigration-emigration events. However, as inferred from monitoring marked A. fissifrons for 3 nights, some individuals form a long-term association with a particular host. The sexratio, body size , and prey intake of A. fissifrons spiders staying in particular hosts' webs during monitoring did not differ from those that left a web. A significant difference was found in prey size distribution between Cyrtophora hosts and A. fissifrons, and the average prey size of the former was far greater than of the latter. This result suggests that A. fissifrons scavenge on webs of Cyrtophora hosts by collecting small prey ignored by the hosts.