Societies with fission-fusion dynamics as complex adaptive systems: the importance of scale

A society as a clearly membered, enduring, territory-holding group

I have attempted to provide a concept of societies that will foster productive cross-disciplinary discussions, namely one incorporating these three elements: (1) A mechanism for group identification, by which members distinguish those who belong from those who do not; (2) the potential for this membership to last for generations; and (3) control over a shared physical space. Herein, I respond to thoughtful commentaries from academics across the social and biological sciences, addressing their insights on the importance of identity in determining society boundaries, how institutions and nations relate to identity, the complications of territoriality as a definition component, how societies fragment, the workings of multitier sociality, and the significance of cooperation.

Connected interactions: enriching food web research by spatial and social interactions

This theme issue features 18 papers exploring ecological interactions, encompassing metabolic, social, and spatial connections alongside traditional trophic networks. This integration enriches food web research, offering insights into ecological dynamics. By examining links across organisms, populations, and ecosystems, a hierarchical approach emerges, connecting horizontal effects within organizational levels vertically across biological organization levels. The inclusion of interactions involving humans is a key focus, highlighting the need for their integration into ecology given the complex interactions between human activities and ecological systems in the Anthropocene. The comprehensive exploration in this theme issue sheds light on the interconnectedness of ecological systems and the importance of considering diverse interactions in understanding ecosystem dynamics. This article is part of the theme issue 'Connected interactions: enriching food web research by spatial and social interactions'.