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What colour is penguin guano?

Published online by Cambridge University Press:  23 June 2017

W.G. Rees ,
J.A. Brown ,
P.T. Fretwell  and
P.N. Trathan
W.G. Rees*
Affiliation:
Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge CB2 1ER, UK
J.A. Brown
Affiliation:
Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge CB2 1ER, UK British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
P.T. Fretwell
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
P.N. Trathan
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
*
wgr2@cam.ac.uk
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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.

Keywords

hyperspectralpenguinsPygoscelisremote sensing
Type
Biological Sciences
Information
Antarctic Science , Volume 29 , Issue 5 , October 2017 , pp. 417 - 425
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Copyright
© Antarctic Science Ltd 2017 

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References

Agnew, D. 1997. The CCAMLR ecosystem monitoring programme. Antarctic Science, 9, 235–242.Google Scholar
Ainley, D. 2002. The Adélie penguin: bellwether of climate change. New York, NY: Columbia University Press, 310 pp.CrossRefGoogle Scholar
Auerswald, L., Freier, U., Lopata, A. & Meyer, B. 2008. Physiological and morphological colour change in Antarctic krill, Euphausia superba: a field study in the Lazarev Sea. Journal of Experimental Biology, 211, 3850–3858.Google Scholar
Black, C.E. 2016. A comprehensive review of the phenology of Pygoscelis penguins. Polar Biology, 39, 405–432.CrossRefGoogle Scholar
Boersma, P.D. 2008. Penguins as marine sentinels. Bioscience, 58, 597–607.CrossRefGoogle Scholar
CCAMLR. 1992. CCAMLR ecosystem monitoring programme (CEMP) standard methods. Hobart, TAS: CCAMLR.Google Scholar
Cramér, H. 1999. Mathematical methods of statistics. Princeton, NJ: Princeton University Press, 592 pp.Google Scholar
Croxall, J. & Kirkwood, E. 1979. The distribution of penguins on the Antarctic Peninsula and islands of the Scotia Sea. Cambridge: British Antarctic Survey, 186 pp.Google Scholar
Dissing, B.S., Nielsen, M.E., Ersbøll, B.K. & Frosch, S. 2011. Multispectral imaging for determination of astaxanthin concentration in salmonids. PLoS ONE, 10.1371/journal.pone.0019032.Google Scholar
Eaton, J., Bateman, D., Hauberg, S. & Wehbring, R. 2015. GNU Octave version 4.0.0 manual: a high-level interactive language for numerical computations. Available at: http://www.gnu.org/software/octave/doc/interpreter/.Google Scholar
Forcada, J. & Trathan, P.N. 2009. Penguin responses to climate change in the Southern Ocean. Global Change Biology, 15, 1618–1630.CrossRefGoogle Scholar
Fox, D. 1955. Astaxanthin in the American Flamingo. Nature, 175, 942–943.Google Scholar
Fretwell, P.T. & Trathan, P.N. 2009. Penguins from space: faecal stains reveal the location of emperor penguin colonies. Global Ecology and Biogeography, 18, 543–552.Google Scholar
Fretwell, P.T., Phillips, R.A., Brooke, M.D.L., Fleming, A.H. & McArthur, A. 2015. Using the unique spectral signature of guano to identify unknown seabird colonies. Remote Sensing of Environment, 156, 448–456.Google Scholar
Heine, J.C. & Speir, T.W. 1989. Ornithogenic soils of the Cape Bird Adélie penguin rookeries, Antarctica. Polar Biology, 10, 89–99.Google Scholar
LaRue, M.A. & Knight, J. 2014. Applications of very high-resolution imagery in the study and conservation of large predators in the Southern Ocean. Conservation Biology, 28, 1731–1735.Google Scholar
LaRue, M.A., Lynch, H.J., Lyver, P.O.B., Barton, K., Ainley, D.G., Pollard, A., Fraser, W.R. & Ballard, G. 2014. A method for estimating colony sizes of Adélie penguins using remote sensing imagery. Polar Biology, 37, 507–517.Google Scholar
Lynch, H.J. & LaRue, M.A. 2014. First global census of the Adélie penguin. Auk, 131, 457–466.Google Scholar
Lynch, H.J., White, R., Black, A.D. & Naveen, R. 2012. Detection, differentiation, and abundance estimation of penguin species by high-resolution satellite imagery. Polar Biology, 35, 963–968.Google Scholar
Myrcha, A. & Tatur, A. 1991. Ecological role of the current and abandoned penguin rookeries in the land environment of the maritime Antarctic. Polish Polar Research, 12, 3–24.Google Scholar
Naveen, R., Lynch, H.J., Forrest, S., Mueller, T. & Polito, M. 2012. First direct, site-wide penguin survey at Deception Island, Antarctica, suggests significant declines in breeding chinstrap penguins. Polar Biology, 35, 1879–1888.Google Scholar
Rees, W. 2013. Physical principles of remote sensing, 3rd edition. Cambridge: Cambridge University Press, 441 pp.Google Scholar
Schwaller, M.R., Benninghoff, W.S. & Olson, C.E. 1984. Prospects for satellite remote-sensing of Adélie penguin rookeries. International Journal of Remote Sensing, 5, 849–853.CrossRefGoogle Scholar
Schwaller, M.R., Southwell, C.J. & Emmerson, L.M. 2013. Continental-scale mapping of Adélie penguin colonies from Landsat imagery. Remote Sensing of Environment, 139, 353–364.Google Scholar
Schwaller, M.R., Olson, C.E., Ma, Z.Q., Zhu, Z.L. & Dahmer, P. 1989. A remote-sensing analysis of Adélie penguin rookeries. Remote Sensing of Environment, 28, 199–206.CrossRefGoogle Scholar
Southwell, C., Emmerson, L., McKinlay, J., Newbery, K., Takahashi, A., Kato, A., Barbraud, C., DeLord, K. & Weimerskirch, H. 2015. Spatially extensive standardized surveys reveal widespread, multi-decadal increase in East Antarctic Adélie penguin populations. PLoS ONE, 10.1371/journal.pone.0139877.Google Scholar
Trathan, P.N. 2004. Image analysis of color aerial photography to estimate penguin population size. Wildlife Society Bulletin, 10.2193/0091-7648(2004)32[332:IAOCAP]2.0.CO;2.Google Scholar
Trathan, P.N., García-Boroboglu, P., Boersma, D., Bost, C.-A., Crawford, R.J.M., Crossin, G.T., Cuthbert, R.J., Dann, P., Davis, L.S., de la Puente, S., Ellenberg, U., Lynch, H.J., Mattern, T., Putz, K., Seddon, P.J., Trivelpiece, W. & Wienecke, B. 2015. Pollution, habitat loss, fishing, and climate change as critical threats to penguins. Conservation Biology, 29, 31–41.CrossRefGoogle ScholarPubMed
Waluda, C.M., Dunn, M.J., Curtis, M.L. & Fretwell, P.T. 2014. Assessing penguin colony size and distribution using digital mapping and satellite remote sensing. Polar Biology, 37, 1849–1855.CrossRefGoogle Scholar
Weimerskirch, H., Inchausti, P., Guinet, C. & Barbraud, C. 2003. Trends in bird and seal populations as indicators of a system shift in the Southern Ocean. Antarctic Science, 15, 249–256.Google Scholar
Witharana, C. & Lynch, H.J. 2016. An object-based image analysis approach for detecting penguin guano in very high spatial resolution satellite images. Remote Sensing, 10.3390/rs8050375.Google Scholar
Woehler, E.J. & Riddle, M.J. 1998. Spatial relationships of Adélie penguin colonies: implications for assessing population changes from remote imagery. Antarctic Science, 10, 449–454.Google Scholar