Table 1 Descriptions of hull metrics used to describe the behaviour of grey seals, Sable Island
From: Sex-differences in fine-scale home-range use in an upper-trophic level marine predator
Name | Description |
|---|---|
core area | an indication of high value resource areas. Core areas were created by sorting hulls by the number of visits. Hulls were then merged until 30% of data points were contained |
eccentricity | a measure of the shape of each hull, varying from 0 to 1 0 - approximates a circle, i.e. intensive, exploitative behaviour 1 - a straight line, i.e. extensive, ballistic behaviour |
number of single visits to a hull | values > 1 are return visits and used as a proxy for site fidelity |
normalized number of single visits to a hull | number of single visits to a hull, km−2 |
mean number of locations per visit to a hull | used as a proxy for residency |
normalized number of locations per visit to a hull | mean number of locations per visit to a hull, km−2 |
probability of area-restricted search | a modelled behavioural measure that reflects the likelihood of apparent foraging |