水生生物学报2017，Vol.41Issue(3)：552-559,8.DOI:10.7541/2017.71
群体成员大小差异对不同生境鲤科鱼类集群行为的影响
EFFECT OF BODY SIZE VARIATION OF GROUP MEMBERS ON SHOAL BEHAVIOR OF TWO CYPRINIDS PREFERRING DIFFERENT HABITATS
摘要
Abstract
The phenotypic composition of groups affect ecological and social processes, which is crucial for collective behavior research. To explore the influence of body size variation on shoal behavior between two cyprinids with diffe-rent habitats, the juvenile Chinese bream (Parabramis pekinensis) preferring still water and Qingbo (Spinibarbus sinen-sis) enjoying flowing water were selected to study spontaneous swimming behavior, spatial structure and the response to startling stimulus of fish groups including four similar fish individuals or including two larger and two smaller fish individuals. The results showed that the spontaneous swimming speed, the synchronization of speed and the alignment polarity of the juvenile Qingbo were significantly higher than those of Chinese bream, and that the responses to frigh-ten stimulus were similar between two species. The polarities of equal-size groups were similar to those of non-equal groups while the non-equal groups showed lower synchronization of speed in both species. However, all measured vari-ables were not different between large and small size individuals within non-equal size group. The difference in body size did not impact group cohesion. The larger individuals of heterogeneity in spatial structure preferred to stay at the front of fish shoal. The flow regime habitats of Qingbo may explain its higher activeness and synchronization of swim-ming speed and alignment polarity than Chinese bream. Group members with different body size can coordinate their swimming speed and direction of movements even with higher group cohesion. Interestingly, smaller Qingbo indivi-duals elevated their speed to keep pace with larger individuals whereas Chinese bream individuals adjusted their speed to a moderate value. Variation of body size decreased the response ratio to frighten stimulus, possibly due to decreased response acuity to external stimulus as a consequences of social factor (e.g. social hierarchy), and impaired efficiency of information flow and (or) the divergence of ecological benefits and costs between larger and smaller size individuals, which subsequently influenced the consensus decision making.关键词
鳊/中华倒刺鲃/凝聚力/协调性/群体位置/刺激反应Key words
Chinese bream/Qingbo/Cohesion/Coordination/Group position/Stimulus response分类
生物科学引用本文复制引用
吴慧,唐中华,黄清,况璐,付世建..群体成员大小差异对不同生境鲤科鱼类集群行为的影响[J].水生生物学报,2017,41(3):552-559,8.基金项目
国家自然科学基金(31670418) （31670418）
国家级大学生创新创业训练计划项目(201510637020)资助 Supported by the National Natural Science Foundation of China (No. 31670418) （201510637020）
National Undergraduate Training Program of Innovation and Entrepreneurship (No. 201510637020) （No. 201510637020）
