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Social communities and spatiotemporal dynamics of association patterns in estuarine bottlenose dolphins

机译:河口宽吻海豚的社会共同体和关联模式的时空动态

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Network analysis has recently been used to delve into the dynamics of cetacean sociality. Few studies, however, have addressed how habitat shape influences sociality, specifically how linear water bodies constrain the space where individuals might interact. We utilized network and spatiotemporal analyses to investigate association patterns and community structure in a bottlenose dolphin population in a linear estuarine system, the Indian River Lagoon (IRL), Florida. Using sighting histories from a multiyear photo-identification study we examined association patterns for 185 individuals collected over a 6.5yr period (2002-2008). The population was highly differentiated (S=0.723) and organized into six distinct social communities (Q=0.544), spread in an overlapping pattern along the linear system. Social organization differed between communities, with some displaying highly interconnected networks and others comprising loosely affiliated individuals with more ephemeral associations. Temporal patterns indicated short-term associations were a significant feature of the fission-fusion dynamics of this population. Spatial analyses revealed that social structure was shaped by an individual's ranging patterns and by social processes including preference and avoidance behavior. Finally, we found that habitat narrowness may be a major driving force behind the sociality observed.
机译:网络分析最近已被用于深入研究鲸类社会性的动态。然而,很少有研究探讨栖息地的形状如何影响社会性,特别是线性水体如何限制个体可能相互作用的空间。我们利用网络和时空分析来研究线性河口系统(佛罗里达州印度河泻湖(IRL))的宽吻海豚种群中的关联模式和群落结构。使用多年照片识别研究中的目击历史,我们检查了6.5年(2002-2008年)期间收集的185个人的联想模式。人口高度分化(S = 0.723),并组织成六个不同的社会社区(Q = 0.544),沿着线性系统以重叠的方式分布。社区之间的社会组织有所不同,一些社区展示了高度相互联系的网络,而其他社区则由松散联系的个人组成,这些个人之间的联系更为短暂。时间模式表明,短期的联系是该种群裂变融合动力学的重要特征。空间分析表明,社会结构是由个人的测距模式和包括偏好和回避行为在内的社会过程所决定的。最后,我们发现栖息地狭窄可能是观察到的社会性背后的主要驱动力。

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