Published January 31, 2019
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Table 1 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 1. Summary of survey effort in the four strata during aerial surveys conducted in Melville Bay from 25 to 30 August 2014.
| Aerial observers | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Image | Aerial observers | (truncated 500 m) | |||||||||||
| Planned/ | Length of | ||||||||||||
| Area | completed | surveyed | Analyzed | No. of | No. | Ave. group | No. of | No. | Ave. group | No. of | No. | Ave. group | |
| Stratum | (km2) | transects (no.) | transects (km) | images a | sightings | of ind.b | size n (CV) | sightings | of ind. | size n (CV) | sightings | of ind. | size n (CV) |
| NW | 6,376 | 5 / 4 | 226 | 2,066 | 0 | 0 | 0 (0) | 0 | 0 | 0 (0) | 0 | 0 | 0 (0) |
| NE | 2,076 | 11 / 12 | 468 | 6,572 | 23 | 49 | 2.1 (0.95) | 15 | 39 | 2.6 (0.77) | 13 | 32.5 | 2.5 (0.76) |
| C | 2,621 | 9 / 18 | 663 | 8,193 | 39 | 86 | 2.2 (0.73) | 48 | 188 | 3.9 (0.69) | 23 | 93.5 | 4.1 (0.61) |
| S | 3,748 | 13 / 10 | 575 | 4,105 | 0 | 0 | 0 (0) | 0 | 0 | 0 | 0 | 0 | 0 |
| All strata | 14,821 | 38 / 44 | 1,932 | 20,936 | 62 | 135 | 2.2 (0.77) | 63 | 227 | 3.6 (0.72) | 36 | 126 | 3.5 (0.69) |
a Including 180 off-effort images that were not used in the analysis. b Ind. = individuals.
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. 1264 in Marine Mammal Science 35 (4) on page 1264, DOI: 10.1111/mms.12586, http://zenodo.org/record/13221822
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Related works
- 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)