From high-resolution to low-resolution dive datasets: a new index to quantify the foraging effort of marine predators

Table 3 Occurrence of prey capture attempts in SES dives

	Intensified foraging effort	Transit
N PrCA/segment
High resolution	2.5 ± 0.02	0.6 ± 0.007
Low resolution	3.9 ± 0.04	0.9 ± 0.01
PrCA rate (n/min of segment duration)
High resolution	1 ± 0.007	0.3 ± 0.003
Low resolution	0.6 ± 0.006	0.2 ± 0.003
% of total PrCA
High resolution	77	23
Low resolution	68	32

Number of prey capture attempts (PrCA) and rate of PrCA per segment according to the foraging behaviour (i.e. hunting or transit) associated with the corresponding segment (mean ± SE from data pooled for the two SES). Percentages of total PrCA were calculated on the whole dataset for both resolutions independently. Hunting phases of high-resolution dives (vertical sinuosity <0.9) and low-resolution dives (segments associated with vertical velocity ≤0.4 m s⁻¹) indicate parts within a dive where a seal intensifies its foraging behaviour

ISSN: 2050-3385