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Staying Alive: Individual Behavioral Variation Influences Survival, but Not Reproductive Success, in Female
Miyako H Warrington1, Annemarie van der Marel2,3, Jennifer Sojka4
1School of Biological and Medical Sciences Oxford Brookes University Headington UK.
Ecology and Evolution
|July 31, 2025
Summary
Individual behavior traits like docility and boldness in female Cape ground squirrels are linked to survival but not reproductive success. These behavioral variations significantly influence survival outcomes in unpredictable environments.
Area of Science:
- Behavioral Ecology
- Animal Behavior
- Wildlife Biology
Background:
- Adaptive strategies are crucial for animals in harsh environments.
- Behavioral variation, or personality, significantly impacts individual fitness and survival outcomes.
- Understanding these links is key to wildlife conservation and management.
Purpose of the Study:
- To investigate the association between individual behavioral variation (personality) and reproductive success and survival in female Cape ground squirrels (Xerus inauris).
- To quantify specific behavioral traits: trap response (docility), trappability (boldness), and trap diversity (exploration).
- To examine the relationship between these behavioral traits and annual/lifetime reproductive success, annual survival, and on-site persistence.
Main Methods:
- A 10-year dataset (2011-2021) was utilized for female Cape ground squirrels.
- Behavioral traits were quantified through responses to trapping and handling, trapping rates, and trapping location diversity.
- Statistical analyses examined correlations between behavioral measures and fitness proxies (reproductive success, survival, persistence).
Main Results:
- Trap response and trappability were positively correlated with annual survival.
- Females with higher trap response (more docile) exhibited higher annual survival.
- Females that ran after release (indicating boldness) showed longer lifespans, and bolder individuals had higher annual survival.
Conclusions:
- Individual behavioral traits, particularly docility and boldness, are significant predictors of survival in female Cape ground squirrels.
- The lack of a strong link between behavior and reproductive success suggests other factors like social dynamics are more critical for reproduction in this species.
- Further research is needed to elucidate the mechanisms driving reproductive success and the broader implications of behavioral variation on fitness in this species.
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