. The Canadian field-naturalist. Natural history. 382 The Canadian Field-Naturalist Vol. Ill. Figure 1. Aerial reconnaissance survey routes flown and Bowheads seen in June, 1994. Repulse Bay was used as a refuelling location. â Survey routes were documented by the observer in the co-pilot seat by recording the time of day and GPS location every 3 to 10 min or when the plane changed bearing. The GPS locations of marine mammal sightings were also recorded. Observers in the passenger section of the plane recorded the time of day of each sighting. The latitude and longitude of these sightings were
. The Canadian field-naturalist. Natural history. 382 The Canadian Field-Naturalist Vol. Ill. Figure 1. Aerial reconnaissance survey routes flown and Bowheads seen in June, 1994. Repulse Bay was used as a refuelling location. â Survey routes were documented by the observer in the co-pilot seat by recording the time of day and GPS location every 3 to 10 min or when the plane changed bearing. The GPS locations of marine mammal sightings were also recorded. Observers in the passenger section of the plane recorded the time of day of each sighting. The latitude and longitude of these sightings were later determined by match- ing time of day with the GPS data used to plot the survey routes. Local hunters reported the date, location and num- ber of Bowheads they sighted opportunistically, dur- ing their travels by boat in northern Foxe Basin. The authors (BP and TQ) recorded the date, location and number of whales seen during boat-based surveys to photograph naturally marked Bowheads. Both boat-based sightings and aerial reconnais- sance data indicated that, in August, Bowheads were aggregated in a relatively well-defined area north of Igloolik Island. Strip surveys were therefore flown to estimate the numbers of Bowheads using the area. The survey block was located between 82° 15' and 80°35'W and extended approximately from the south shore of Richards Bay or the north side of Igloolik Island to the south coast of Baffin Island (Figure 3). Survey transects were north-south and spaced about km (10 min of longitude) apart (Table 1). The complete survey block was sampled on each of three days: 11,13 and 15 August. The air- craft remained on transect at all times and did not break off from the flight path to examine individual groups. The entire survey block was sampled in 2 to hours. We used the same deHavilland Twin Otter for the strip surveys as was used for reconnaissance surveys and, again, flew at an altitude of 338 m at 204 to 222 km/h (110 to 120 knots).
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