Non-random associations in group housed rats (Rattus norvegicus)

Proops, Leanne, Troisi, Camille, Kleinhappel, Tanja and Romero, Teresa (2021) Non-random associations in group housed rats (Rattus norvegicus). Scientific Reports, 11 . p. 15349. ISSN 2045-2322

Full content URL: https://doi.org/10.1038/s41598-021-94608-4

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Non-random associations in group housed rats (Rattus norvegicus)
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Abstract

Ecological factors, such as predation, have traditionally been used to explain sociability. However, it is increasingly recognised that individuals within a group do not associate randomly, and that these non-random associations can generate fitness advantages. The majority of the empirical evidence on differentiated associations in group-living mammals, however, comes from a limited number of taxa and we still know very little about their occurrence and characteristics in some highly social species, such as rats (Rattus spp.). Here, using network analysis, we quantified association patterns in four groups of male fancy rats. We found that the associations between rats were not randomly distributed and that most individuals had significantly more preferred/avoided associates than expected by random. We also found that these preferences can be stable over time, and that they were not influenced by individuals’ rank position in the dominance hierarchy. Our findings are consistent with work in other mammals, but contrast with the limited evidence available for other rat strains. While further studies in groups with different demographic composition are warranted to confirm our findings, the occurrence of differentiated associations in all male groups of rats have important implications for the management and welfare of captive rat populations.

Keywords:Rats, Rattus norvegicus, social relationships, Social Networks, Non-random associations, Social groups
Subjects:D Veterinary Sciences, Agriculture and related subjects > D300 Animal Science
Divisions:College of Science > School of Life Sciences
ID Code:45785
Deposited On:20 Sep 2021 09:51

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