IMIS

The methodology for obtaining data consists of the recording of sightings of cetaceans and seabirds during periods of sampling effort that cover daylight hours with sea state conditions equal to or less than 5 on the Beaufort scale through pre-established transects perpendicular to the coast, as well as in the paths between transects. During sampling effort, data on environmental conditions are collected. For each sampling, data on the position, time, distance, and angle with respect to the bow of the ship, are collected, as well as a series of data including the species (or taxonomic group when animals were not identified at species level), number of individuals, life stage or behaviour. This database shows the coordinates of the ship at the time of sighting.

The sightings are recorded by 2 top predators’ observers that carry out search effort from the outer area in front of the bridge, from 8 in the morning local time until sunset, and whenever the sea state is equal to or less than 5.

Data obtained during the PELACUS oceanographic survey, carried out annually between the spring months of March and April, from 2007 to 2022, with the exception of 2020, when the survey was not carried out for health reasons caused by COVID-19. The study area is covered by transects perpendicular to the coast. In each survey, between 44 and 56 transects are carried out, separated from each other by 8 or 10 nautical miles, with variability in the design of the transects in the different years.

The data are validated by the observer at the end of each day

Method step description:

1. During sampling effort, data on environmental conditions are periodically collected.
2. For each sampling, data on the position, time, distance, and angle with respect to the bow of the ship, are collected, as well as a series of data including the species (or taxonomic group when animals were not identified at species level), number of individuals, life stage or behaviour. This database shows the coordinates of the ship at the time of sighting.