Table 1 Dive predictor variables selected for analysing bottom-use via k-means clustering for three adult female Australian sea lions. ‘Bottom’ is defined as periods when animal is at >80% of maximum depth
From: A novel method for identifying fine-scale bottom-use in a benthic-foraging pinniped
Cluster predictor variables | Description of variable |
|---|---|
Bottom time | Total bottom time (s) |
Time at depth | Time at depth index. ∑ =total bottom time (s) / maximum dive depth (m) |
Bottom distance | Total distance travelled at bottom (m) |
Depth variability | Depth variability index. ∑ =standard deviation of bottom depth / mean bottom depth (m) |
Bottom speed | Mean horizontal bottom speed (m/s) |
Bottom sinuosity | Mean bottom sinuosity index. ∑ =distance travelled / straight-line distance (from start to end point of bottom phase) |
Colony distance | Mean straight-line distance from colony (km) |