Laidre, Kristin L; Heide-Jørgensen, Mads Peter (2011): (Table 4) Habitat associations, probability of sightings and mean group size of narwhals (Monodon monoceros) in Baffin Bay in April 2008 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.815149, In supplement to: Laidre, KL; Heide-Jørgensen, MP (2011): Life in the lead: extreme densities of narwhals Monodon monoceros in the offshore pack ice. Marine Ecology Progress Series, 423, 269-278, https://doi.org/10.3354/meps08941
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Coverage:
Median Latitude: 67.750000 * Median Longitude: -59.500000 * South-bound Latitude: 67.000000 * West-bound Longitude: -61.000000 * North-bound Latitude: 68.500000 * East-bound Longitude: -58.000000
Date/Time Start: 2008-04-03T00:00:00 * Date/Time End: 2008-04-03T00:00:00
Event(s):
Comment:
The probability of a sighting is the number of sightings (irrespective of group size) divided by the number of associated images. The mean group size is the total number of narwhals seen in the habitat type divided by the number of sightings.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Geocode | |||
| 2 | Habitat | Habitat | Laidre, Kristin L | Digital aerial photography | ||
| 3 | Number | No | Laidre, Kristin L | Digital aerial photography | of images | |
| 4 | Number of observations | NOBS | # | Laidre, Kristin L | narwhal sightings | |
| 5 | Monodon monoceros | M. monoceros | # | Laidre, Kristin L | ||
| 6 | Probability | Prob | Laidre, Kristin L | of narwhal sightings (= NOBS/no. of images) | ||
| 7 | Monodon monoceros, group size | M. monoceros group size | Laidre, Kristin L | mean per sighting | ||
| 8 | Number | No | Laidre, Kristin L | expected no. of narwhals/image |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
42 data points
Data
| 1 Date/Time | 2 Habitat | 3 No (of images) | 4 NOBS [#] (narwhal sightings) | 5 M. monoceros [#] | 6 Prob (of narwhal sightings (= NOBS/...) | 7 M. monoceros group size (mean per sighting) | 8 No (expected no. of narwhals/image) |
|---|---|---|---|---|---|---|---|
| 2008-04-03 | All heavy ice | 1227 | 17 | 34 | 0.014 | 2.000 | 0.028 |
| 2008-04-03 | Mixed heavy and new ice | 114 | 2 | 6 | 0.018 | 3.000 | 0.053 |
| 2008-04-03 | All new ice | 76 | 8 | 17 | 0.105 | 2.125 | 0.224 |
| 2008-04-03 | Water < 10% | 78 | 15 | 23 | 0.192 | 1.533 | 0.295 |
| 2008-04-03 | 10% < water < 50% | 25 | 4 | 15 | 0.160 | 3.750 | 0.600 |
| 2008-04-03 | Water > 50% | 42 | 3 | 5 | 0.071 | 1.667 | 0.119 |