Kin in space: social viscosity in a spatially and genetically substructured network
Jochen B W Wolf1, Fritz Trillmich
1Institute for Genetics, Evolutionary Genetics, University of Köln, Zülpicherstrasse 47, 50674 Köln, Germany. jochen.wolf@uni-bielefeld.de
Proceedings. Biological Sciences
|June 5, 2008
Summary
Galápagos sea lions exhibit genetic clusters linked to spatial networks, not just family groups. Even low relatedness influences social behavior, suggesting kin selection in dense animal societies.
Area of Science:
- Animal behavior and genetics
- Social network analysis
- Population structure
Background:
- Animal societies exhibit complex substructuring influenced by spatial relationships and social networks.
- Analyzing large, dynamic social systems and their genetic structure is challenging.
- Network approaches offer powerful tools to understand social behavior, dispersal, and genetics.
Purpose of the Study:
- To investigate the relationship between social networks, spatial structure, and genetic substructure in Galápagos sea lions (Zalophus wollebaeki).
- To determine if genetic structure arises from targeted interactions within family groups or emergent properties of social networks.
- To explore the influence of relatedness on social interactions and kin selection in a gregarious species.
Main Methods:
- Application of network analytical tools to a Galápagos sea lion colony.
- Analysis of social relationships and genetic data within the network structure.
- Identification of genetic clusters corresponding to 'network communities'.
Main Results:
- Several genetic clusters were identified, aligning with spatially determined 'network communities'.
- Low overall relatedness was observed; genetic structure appeared to be an emergent property of philopatry.
- Social relationships were stronger between genetically similar individuals in direct network proximity.
Conclusions:
- Genetic structure in Galápagos sea lions is influenced by spatial relationships and network properties, not solely by family groups.
- Even minor differences in relatedness can impact social behavior and decision-making.
- Kin selection may operate at low levels of relatedness in dense populations, promoting cooperation like increased tolerance.
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