Consistent inter-individual differences in behavior have been shown in several animal groups, ranging from vertebrates to invertebrates. One of the most studied personality traits in animals is boldness, which is the tendency to expose to risky situations. Theory proposes that individuals’ state (e.g., body energy) would influence the expression of personality traits. In this study, we tested if boldness levels of the harvestman Mischonyx cuspidatus (measured as duration of death feigning/freezing after simulated predator attack) differ between two different states, namely sated and food deprived. We also tested if the degree of repeatability in boldness is affected by the individual state. We found no differences in the levels of boldness expressed by M. cuspidatus when comparing between different conditions (sated and food deprived) at a population level. However, we found that individuals showed more consistency in boldness when sated relative to a food-deprived condition. Finally, we suggest new avenues for future studies addressing personality in harvestmen.

中文翻译：

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饥饿减少了新热带收割者的行为一致性

在从脊椎动物到无脊椎动物的数个动物类群中，行为上的个体间差异一直存在。动物中最受研究的人格特征之一是大胆，这是暴露于危险情况下的趋势。理论认为，个人的状态（例如，身体能量）将影响人格特质的表达。在这项研究中，我们测试了收割者Mischonyx cuspidatus的大胆程度（以模拟捕食者袭击后死亡假装/冻结的持续时间来衡量）是否在两个不同的状态（即饱腹感和食物不足）之间有所不同。我们还测试了粗体性的可重复性程度是否受各个状态的影响。我们发现M表示的大胆程度没有差异。尖牙在人口水平上比较不同状况（饱足和食物匮乏）时。但是，我们发现，相对于食物匮乏的状况，个人在饱餐时表现出更大的一致性。最后，我们为将来的研究提出了新的途径，以解决收割者的性格问题。