2.2 Location data processing
Location and dive were obtained through the Argos Data Collection and
Location System using the Kalman filter which greatly improves the
location data (Lopez et al. 2014). Dive data were decoded in Wildlife
Computers portal. All statistical analyses were performed using R
software version 4.0.0. We restricted our dataset to positions
associated with a travel speed lower than 7 km.h-1(Wahlberg 2002). Locations on land were also discarded. Any individuals
containing less than 10 locations (over both seasons together) were also
discarded from the analysis. In order to assess seasonal patterns and
monsoon periods of the Indian Ocean, seasons were discriminated as
follows: dry season from April to November and wet season from December
to March.