database.xlsx (26.69 kB)
Sighting data base
dataset
posted on 2016-09-27, 02:22 authored by Natalia DellabiancaNatalia Dellabianca, Mónica A. Torres, Gabriela Scioscia, Andrea Raya ReyThis dataset has Commerson’s
dolphin Cephalorhynchus c. commersonii
and Peale’s dolphin Lagenorhynchus australis sightings collected during eight scientific
cruises on board
of the vessels R/V Puerto Deseado and Tango SB-15 of Argentina during austral summer
and fall months (November-April) between 2009 and 2015, along the Patagonian
shelf .
Cetacean
sightings were recorded on a portable handheld computer with integrated GPS
(Trimble Juno ST), using the free software CyberTracker (CyberTracker Software
(Pty) Ltd Reg. no. 97/01908/07, http://www.cybertracker.co.za). Surveys were
conducted daily during daylight hours (~ 12 hrs) at a mean vessel speed of 10
knots. During the surveys, two observers collected the data from both sides of
the vessel, through naked eye scans supplemented by use of 7x50 binoculars with internal compass and reticle. A
third observer assisted in the scans and recorded observations. Observers
switched between the three positions at 2 hour intervals. Data recorded for
each sighting included GPS position, date and time, sighting distance, sighting
angle, species, group size and composition. Vessel speed, air temperature, wind
speed and direction, Beaufort Sea State (BSS), cloud cover and visibility were
recorded at the start of each day and updated whenever they changed.
