Published January 31, 2019
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Table 2 in A comparison of image and observer based aerial surveys of narwhal
Authors/Creators
- 1. Shell Global Solutions International B. V., Kesslerpark 1, 2288 GS, Rijswijk, the Netherlands and Groningen Institute for Evolutionary Life Sciences, University of Groningen, PO Box 11103, 9700 CC Groningen, the Netherlands;
- 2. Greenland Institute of Natural Resources, ℅ Greenland Representation, Strandgade 91, 2, DK- 1401 KØbenhavn K, Denmark;
- 3. LGL Alaska Research Associates, Inc., 2000 West International Airport Road, STE C- 1, Anchorage, Alaska 99502, U. S. A.;
- 4. LGL Limited environmental research associates, 22 Fisher Street, PO Box 280, King City, Ontario L 7 B 1 A 6, Canada;
- 5. Greenland Institute of Natural Resources, ℅ Greenland Representation, Strandgade 91, 2, DK- 1401 KØbenhavn K, Denmark.
Description
Table 2. Summary of sightings by image analysts and/or aerial observers, with and without truncation at 500 m. Where both aerial observer pairs had the same sighting with different group size or perpendicular distance estimates, an averaged value was used.
| Only | Sighted by | Sighted by | ||||
|---|---|---|---|---|---|---|
| Sighted by | sight by | Only | image | image analyst | ||
| image | Sighted by | image | sighted by | analyst | and/or | |
| analyst | observer | analyst | observer | and observer | observer | |
| No truncation | ||||||
| No. of groups | 62 | 63 | 34 | 35 | 28 | 97 |
| No. of animals | 135 | 227 | 62 | 124 | 88 | 274 |
| Average group size | 2.2 | 3.6 | 1.8 | 3.5 | 3.1 | 2.8 |
| Average distance | 227 | 580 | 237 | 839 | 329 | 454 |
| Truncation = 500 m | ||||||
| No. of groups | 62 | 36 | 34 | 8 | 28 | 70 |
| No. of animals | 135 | 126 | 62 | 24 | 88 | 173 |
| Average group size | 2.2 | 3.5 | 1.8 | 3.0 | 3.1 | 2.5 |
| Average distance | 227 | 269 | 237 | 329 | 234 | 247 |
Notes
Published as part of Bröker, Koen C. A., Hansen, Rikke G., Leonard, Kathleen E., Koski, William R. & Heide-Jørgensen, Mads Peter, 2019, A comparison of image and observer based aerial surveys of narwhal, pp. 1266 in Marine Mammal Science 35 (4) on page 1266, DOI: 10.1111/mms.12586, http://zenodo.org/record/13221822
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- Is part of
- Journal article: 10.1111/mms.12586 (DOI)
- Journal article: urn:lsid:plazi.org:pub:FFAEE07B945BFFAF175CFFE25E25FFC1 (LSID)
- Journal article: http://zenodo.org/record/13221822 (URL)
- Journal article: http://publication.plazi.org/id/FFAEE07B945BFFAF175CFFE25E25FFC1 (URL)