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Satellites, the all-seeing eyes in the sky: counting elephant seals from space
Citation
McMahon, CR and Howe, H and van den Hoff, J and Alderman, R and Brolsma, H and Hindell, MA, Satellites, the all-seeing eyes in the sky: counting elephant seals from space, PLoS One, 9, (3) Article e92613. ISSN 1932-6203 (2014) [Refereed Article]
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Copyright Statement
Copyright 2014 the Authors-This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI: doi:10.1371/journal.pone.0092613
Abstract
Regular censuses are fundamental for the management of animal populations but, are logistically challenging for species
living in remote regions. The advent of readily accessible, high resolution satellite images of earth mean that it is possible to
resolve relatively small (0.6 m) objects, sufficient to discern large animals. To illustrate how these advances can be used to
count animals in remote regions, individual elephant seals (Mirounga leonina) were counted using satellite imagery. We
used an image taken on 10/10/2011 to count elephant seals (n = 17906306 (95%CL)) on the isthmus of Macquarie Island, an
estimate which overlapped with concurrent ground counts (n = 1991). The number of individuals per harem estimated using
the two approaches were highly correlated, with a slope close to one and the estimated intercept also encompassing zero.
This proof of concept opens the way for satellites to be used as a standard censusing technique for inaccessible and
cryptically coloured species. Quantifying the population trends of higher order predators provides an especially informative
and tractable indicator of ecosystem health.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | Southern Ocean, predators, ecology |
| Research Division: | Biological Sciences |
| Research Group: | Ecology |
| Research Field: | Marine and Estuarine Ecology (incl. Marine Ichthyology) |
| Objective Division: | Environment |
| Objective Group: | Ecosystem Assessment and Management |
| Objective Field: | Ecosystem Assessment and Management of Antarctic and Sub-Antarctic Environments |
| Author: | McMahon, CR (Dr Clive McMahon) |
| Author: | Howe, H (Mr Hamish Howe) |
| Author: | Hindell, MA (Professor Mark Hindell) |
| ID Code: | 92723 |
| Year Published: | 2014 |
| Web of Science® Times Cited: | 14 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2014-06-26 |
| Last Modified: | 2017-11-15 |
| Downloads: | 227 View Download Statistics |
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