Table 4 Working hypotheses and variables used to explain P. unifilis nest removal by humans in the eastern Brazilian Amazon.
From: Substrate influences human removal of freshwater turtle nests in the eastern Brazilian Amazon
Category | Working hypothesis | Variable name | Variable description | Variable supporta |
|---|---|---|---|---|
Environmental | Nesting area type could influence the access of predators affecting nest removal | Type | Categorical – located along the river bank or island | − |
Environmental | Nest density could influence the success of predators finding nests and affect nest removal | Nest density | Continuous – Number of turtle nests per nesting area (m2) | − |
Environmental | Nest distance to water could influence the detectability of the nest, affecting nest removal | Distance to water | Continuous – Distance (m) from turtle nests to the nearest water source | + |
Environmental | Different substrate types can affect nest detectability, and nest removal | PC1 scores | Continuous – Principal Component axis 1 scores from proportions of substrate grain sizes | ++ |
Anthropogenic | Since Araguari river has higher anthropogenic pressure, different rivers will present differences in nest site selection and nest removal | River | Categorical – River segment (Falsino or Araguari) | ++ |
Anthropogenic | Closer to houses human disturbances will increase, affecting nest site selection and nest removal | Distance to house | Continuous – Distance (km) to nearest riverine house | − |
Spatial | Nests spatial distribution will affect nest removal | Long, Lat | Continuous – Coordinates (decimal degrees) of nests | − |
Spatial | Nests located in the same nest site are more likely to have similar removal rates | Nesting site ID | Categorical – Nest site identification | ++ |
