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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

NameDescription
core areaan 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
eccentricitya 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 hullvalues > 1 are return visits and used as a proxy for site fidelity
normalized number of single visits to a hullnumber of single visits to a hull, km−2
mean number of locations per visit to a hullused as a proxy for residency
normalized number of locations per visit to a hullmean number of locations per visit to a hull, km−2
probability of area-restricted searcha modelled behavioural measure that reflects the likelihood of apparent foraging