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Abstract：
Behavioural lateralization, which reflects the functional specializations of the two brain hemispheres, is assumed to play an important role in cooperative intraspecific interactions. However, there are few studies focused on the lateralization in cooperative behaviours of individuals, especially in a natural setting. In the present study, we investigated lateralized spatial interactions between the partners in life-long monogamous pairs. The male-female pairs of two geese species (barnacle, Branta leucopsis, and white-fronted, Anser albifrons geese), were observed during different stages of the annual cycle in a variety of conditions. In geese flocks, we recorded which visual hemifield (left/right) the following partner used to monitor the leading partner relevant to the type of behaviour and the disturbance factors. In a significant majority of pairs, the following bird viewed the leading partner with the left eye during routine behaviours such as resting and feeding in undisturbed conditions. This behavioural lateralization, implicating the right hemisphere processing, was consistent across the different aggregation sites and years of the study. In contrast, no significant bias was found in a variety of geese behaviours associated with enhanced disturbance (when alert on water, flying or fleeing away when disturbed, feeding during the hunting period, in urban area feeding and during moulting). We hypothesize that the increased demands for right hemisphere processing to deal with stressful and emergency situations may interfere with the manifestation of lateralization in social interactions.
摘要：
行为偏侧化，这反映了两个大脑半球的功能专业化，被认为在合作种内相互作用中起着重要作用。然而,很少有研究关注个体合作行为的偏侧化，尤其是在自然环境中。在本研究中,我们调查了终身一夫一妻制伴侣之间的横向空间相互作用。两种鹅的雌雄对（藤壶，菊花,白色正面，Anseralbifrons鹅)，在各种条件下的年度周期的不同阶段观察到。在鹅群中，我们记录了以下合作伙伴用于监测与行为类型和干扰因素相关的主要合作伙伴的视觉偏场（左/右）。在绝大多数配对中，以下鸟类在常规行为中，例如在不受干扰的条件下休息和进食时，用左眼观察了主要伴侣。这种行为偏侧化，暗示右半球的处理，在不同的聚集地点和研究年份是一致的。相比之下,在与增强的干扰相关的各种鹅行为中没有发现明显的偏见(当警惕水上时，被打扰时飞走或逃跑，在狩猎期间进食，在市区喂养和换羽期间)。我们假设对右半球处理以应对压力和紧急情况的需求增加可能会干扰社交互动中偏侧化的表现。
