Marmot mass gain rates relate to their group’s social structure

Mass gain is an important fitness correlate for survival in highly seasonal species. While many physiological, genetic, life history, and environmental factors can influence mass gain, more recent work suggests the specific nature of an individual’s own social relationships also influences mass gain. However, less is known about consequences of social structure for individuals. We studied the association between social structure, quantified via social network analysis, and annual mass gain in yellow-bellied marmots (Marmota flaviventer). Social networks were constructed from 31,738 social interactions between 671 individuals in 125 social groups from 2002 to 2018. Using a refined dataset of 1,022 observations across 587 individuals in 81 social groups, we fitted linear mixed models to analyze the relationship between attributes of social structure and individual mass gain. We found that individuals residing in more connected and unbreakable social groups tended to gain proportionally le...