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Table 2 Structure of fitted models and their associated hypotheses or questions

From: The importance of having a partner: male help releases females from time limitation during incubation in birds

Model Response variable Predictors Species Hypothesis or question
1 Total nest attentiveness Male attentiveness, body mass, hemisphere, latitude Shared incubation Total nest attentiveness increases with the intensity of direct male help
2 Total nest attentiveness Female attentiveness, body mass, hemisphere, latitude Shared incubation Total nest attentiveness and female contribution to attentiveness are not correlated
3 Female attentiveness Male attentiveness Shared incubation Male contribution increases with total nest attentiveness, female contribution does not
4 Total nest attentiveness Incubation feeding, body mass, hemisphere, latitude Incubation feeding Total nest attentiveness increases with the intensity of indirect male help
5 Total nest attentiveness Incubation category, body mass, hemisphere, latitude All Male help (direct or indirect) increases average total nest attentiveness. Do direct vs. indirect male help differ in their effects on average total nest attentiveness?
6 Female nest attentiveness Incubation category, body mass, hemisphere, latitude All Does direct male participation change average female incubation effort?
  1. In models 1 and 2, we fitted an interaction of male or female attentiveness with hemisphere; in model 4, an interaction of incubation feeding with hemisphere. In models 5 and 6, we fitted two-way interactions of incubation category with hemisphere, latitude, and body mass.
  2. Predictors include incubation category (female-only care, incubation feeding, shared incubation), male care (present vs. absent), body mass (g), hemisphere (North vs. South), and absolute latitude (between 0 and 90).