Social network analysis of dominance behavior and social structure of Crossoptilon crossoptilon in breeding season

doi:10.3969/j.issn.1000-2006.201805020

SHI Shumin, WANG Nan, LI Zhaxijie

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (03) : 137-144.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (03) : 137-144. DOI: 10.3969/j.issn.1000-2006.201805020

Social network analysis of dominance behavior and social structure of Crossoptilon crossoptilon in breeding season

SHI Shumin¹, WANG Nan^1*, LI Zhaxijie²

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Abstract

【Objective】Interactions between individuals of the white eared-pheasant(Crossoptilon crossoptilon), lead to a complex social structure in pheasant flocks. The objective of the present study was to explain the dominance hierarchy and social structure of this species from a social network perspective, and explored the dominance behavior and flock structure in breeding period, to provide a scientific basis for the study of social organization of C. crossoptilon. 【Method】We recorded the aggregation preferences of flock members and dominant-subordinate interaction frequencies during the pre-brooding and brooding periods of 49 C. crossoptilon in a field. We calculated the linear degree of dominant-subordinate matrix and the dominance score of individuals, and built a network visualization of the community cohesion relationship matrix and the dominance relationship matrix. An artificial random aggregation matrix simulation was used to test whether the observed matrix was caused by random factors. Network parameters and modularity values were calculated respectively. Variance analysis was used to test for differences in the dominance relationship intensity of individuals within and between communities.【Result】①The dominance relationship network showed that there was a dominance hierarchy within the C. crossoptilon flock, and the dominant pattern was linear. ②Three modules were found in the flock, but the module members were different between the two periods. ③Closeness centrality had a significant impact on modularity, the modularization degree during the brooding period was higher than during the pre-brooding period, and community cohesion during the brooding period was higher than that during the pre-brooding period. ④The distribution of mates was constrained by modularity, as all mates were distributed in the same module in the brooding period. ⑤The individuals’ interactive dominance intensity within communities was stronger than that between communities, and high dominance rank individuals had higher group cohesion ability than low dominance rank individuals. 【Conclusion】 In this study, we observed within-flock relationships and hierarchical behavior in C. crossoptilon. Using network visualization, we found a modular structure in the C. crossoptilon flocks during the breeding season. Additionally, the individual’s dominance relationship was different within versus between modules.

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SHI Shumin, WANG Nan, LI Zhaxijie. Social network analysis of dominance behavior and social structure of Crossoptilon crossoptilon in breeding season[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2019, 43(03): 137-144 https://doi.org/10.3969/j.issn.1000-2006.201805020

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