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What colour is penguin guano?

  • W.G. Rees (a1), J.A. Brown (a1) (a2), P.T. Fretwell (a2) and P.N. Trathan (a2)
Abstract
Abstract

The identification and quantification of Antarctic Pygoscelis penguin colonies depends increasingly on recognition of the characteristic optical properties of guano deposits, but almost all knowledge of these properties until now has been compromised by resolution and atmospheric propagation effects. Here we present hyperspectral reflectance data in the range 350–2500 nm, collected in situ from fresh guano deposits in Pygoscelis penguin colonies on Signy Island, South Orkney Islands. The period of data collection included the transition from predominantly white guano to the pink coloration characteristic of a krill-rich diet. The main identifiable features in the spectra are a broad absorption feature centred around 550 nm, responsible for the pink coloration and identified with the pigment astaxanthin, as well as several water absorption features. Variations in these features are responsible for differentiation between spectra. From these results we propose two spectral indices suitable for use with satellite data, one of which responds to the presence of astaxanthin in the guano and the other to water. Our results do not allow us to differentiate between penguin species from their guano, but do suggest that the breeding phenology of Pygoscelis penguins could be determined from a time series of multispectral imagery.

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Corresponding author
wgr2@cam.ac.uk
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

L. Auerswald , U. Freier , A. Lopata & B. Meyer 2008. Physiological and morphological colour change in Antarctic krill, Euphausia superba: a field study in the Lazarev Sea. Journal of Experimental Biology, 211, 38503858.

P.D. Boersma 2008. Penguins as marine sentinels. Bioscience, 58, 597607.

D. Fox 1955. Astaxanthin in the American Flamingo. Nature, 175, 942943.

P.T. Fretwell , R.A. Phillips , M.D.L. Brooke , A.H. Fleming & A. McArthur 2015. Using the unique spectral signature of guano to identify unknown seabird colonies. Remote Sensing of Environment, 156, 448456.

J.C. Heine & T.W. Speir 1989. Ornithogenic soils of the Cape Bird Adélie penguin rookeries, Antarctica. Polar Biology, 10, 8999.

M.A. LaRue , H.J. Lynch , P.O.B. Lyver , K. Barton , D.G. Ainley , A. Pollard , W.R. Fraser & G. Ballard 2014. A method for estimating colony sizes of Adélie penguins using remote sensing imagery. Polar Biology, 37, 507517.

M.R. Schwaller , W.S. Benninghoff & C.E. Olson 1984. Prospects for satellite remote-sensing of Adélie penguin rookeries. International Journal of Remote Sensing, 5, 849853.

M.R. Schwaller , C.E. Olson , Z.Q. Ma , Z.L. Zhu & P. Dahmer 1989. A remote-sensing analysis of Adélie penguin rookeries. Remote Sensing of Environment, 28, 199206.

P.N. Trathan , P. García-Boroboglu , D. Boersma , C.-A. Bost , R.J.M. Crawford , G.T. Crossin , R.J. Cuthbert , P. Dann , L.S. Davis , S. de la Puente , U. Ellenberg , H.J. Lynch , T. Mattern , K. Putz , P.J. Seddon , W. Trivelpiece & B. Wienecke 2015. Pollution, habitat loss, fishing, and climate change as critical threats to penguins. Conservation Biology, 29, 3141.

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Antarctic Science
  • ISSN: 0954-1020
  • EISSN: 1365-2079
  • URL: /core/journals/antarctic-science
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