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Brood as booty: the effect of colony size and resource value in social insect contests
Behavioral Ecology ( IF 2.5 ) Pub Date : 2022-02-07 , DOI: 10.1093/beheco/arac019
Kenneth James Chapin 1 , Victor Alexander Paat 2 , Anna Dornhaus 1
Affiliation  

Animals engage in contests for access to resources like food, mates, and space. Intergroup contests between groups of organisms have received little attention, and it remains unresolved what information groups might use collectively to make contest decisions. We staged whole-colony contests using ant colonies (Temnothorax rugatulus), which perceive conspecific colonies as both a threat and resource from which to steal brood. We recorded individual behaviors and used demographic characteristics as proxies for resource value (number of brood items) and fighting ability (number of workers). We found that ants altered their fighting effort depending on the relative number of workers of their opponent. Although the proximate mechanism for this ability remains uncertain, we found that colonies increased fighting when their opponent had relatively more brood, but not if opposing colonies had relatively many more workers. This suggests that ant colonies can use information about opposing colonies that shapes contest strategies. Further, the behavior of opposing colonies was strongly correlated with each other despite colony size differences ranging from 4% to 51%, consistent with the hypothesis that colonies can use opponent information. The behavior of a distributed, collective system of many individuals, like a eusocial insect colony, thus fits several predictions of contest models designed for individuals if we consider the gain and loss of worker ants analogous to energetic costs accrued during typical dyadic contests.

中文翻译:

作为战利品的育雏:群落规模和资源价值在社会昆虫竞赛中的影响

动物为了获取食物、伴侣和空间等资源而参加比赛。生物群体之间的群体间竞争很少受到关注,并且仍然没有解决群体可能集体使用哪些信息来做出竞争决定。我们使用蚁群 (Temnothorax rugatulus) 举办了整个蚁群竞赛,它们将同种蚁群视为一种威胁和资源,可以从中窃取幼虫。我们记录了个人行为并使用人口统计特征作为资源价值(育雏项目数量)和战斗能力(工人数量)的代理。我们发现蚂蚁会根据对手工人的相对数量来改变他们的战斗努力。尽管这种能力的近似机制仍然不确定,我们发现当他们的对手有更多的巢穴时,殖民地会增加战斗,但如果对方的殖民地有更多的工人,则不会。这表明蚁群可以使用有关形成竞争策略的对立殖民地的信息。此外,尽管菌落大小差异从 4% 到 51% 不等,但对立菌落的行为彼此之间存在很强的相关性,这与菌落可以使用对手信息的假设一致。因此,如果我们考虑工蚁的得失类似于典型的二元竞赛期间累积的能量成本,那么由许多个体组成的分布式集体系统的行为,例如一个社会性昆虫群落,符合为个人设计的竞赛模型的几个预测。这表明蚁群可以使用有关形成竞争策略的对立殖民地的信息。此外,尽管菌落大小差异从 4% 到 51% 不等,但对立菌落的行为彼此之间存在很强的相关性,这与菌落可以使用对手信息的假设一致。因此,如果我们考虑工蚁的得失类似于典型的二元竞赛期间累积的能量成本,那么由许多个体组成的分布式集体系统的行为,例如一个社会性昆虫群落,符合为个人设计的竞赛模型的几个预测。这表明蚁群可以使用有关形成竞争策略的对立殖民地的信息。此外,尽管菌落大小差异从 4% 到 51% 不等,但对立菌落的行为彼此之间存在很强的相关性,这与菌落可以使用对手信息的假设一致。因此,如果我们考虑工蚁的得失类似于典型的二元竞赛期间累积的能量成本,那么由许多个体组成的分布式集体系统的行为,例如一个社会性昆虫群落,符合为个人设计的竞赛模型的几个预测。与殖民地可以使用对手信息的假设一致。因此,如果我们考虑工蚁的得失类似于典型的二元竞赛期间累积的能量成本,那么由许多个体组成的分布式集体系统的行为,例如一个社会性昆虫群落,符合为个人设计的竞赛模型的几个预测。与殖民地可以使用对手信息的假设一致。因此,如果我们考虑工蚁的得失类似于典型的二元竞赛期间累积的能量成本,那么由许多个体组成的分布式集体系统的行为,例如一个社会性昆虫群落,符合为个人设计的竞赛模型的几个预测。
更新日期:2022-02-07
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