Publications

Below is a list of publications. You can click on the click at the end of each paper to download the PDF.

Covers

A full list of publications can also be found at Google Scholar Citations:

2017

Portugal, S.J., Ricketts, R., Chappell, J., White, C.R., Shepard, E.L. and Biro, D. (2017) Boldness traits, not dominance, predicts exploratory flight range and homing behaviour in homing pigeons. Philosophical Transactions of the Royal Society B. 372: 20160234. Portugal et al. 2017 Phil Trans B

Taylor, L. A., Portugal, S. J. and Biro, D. (2017) Homing pigeons modulate wingbeat characteristics as a function of route familiarity. Journal of Experimental Biology. In Press.

Guillemette, M., Pelletier, D., Portugal, S.J. and Polymeropoulos, E.T. (2017) It takes time to be cool: on the relationship between hyperthermia and body cooling in a migrating seaduck. Frontiers in Physiology. In Press.

Tate, M., McGoran, R.E., White, C.R. and Portugal, S.J. (2017) Life in a bubble: the role of the labyrinth organ in determining territory, mating and aggressive behaviours in Anabantoid fish. Journal of Fish Biology. In Press.

Portugal, S.J., Murn, C.P. and Martin, G.R. (2017) White-headed vultures show visual field characteristics of hunting raptors. Ibis. 159: 463-466. Portugal et al. 2017b Ibis

Portugal, S.J., Sivess, L., Butler, P.J., Martin, G.R. and White, C.R. (2017) Perch height predicts dominance rank in birds. Ibis. 159: 456-462. Portugal et al. 2017 Ibis

2016

Guillemette, M., Woakes A.J., Larochelle, J, Polymeropoulos, E, Granbois, J-M, Butler, P.J., Pelletier, D., Frappell, P.D and Portugal, S.J. (2016) Does hyperthermia constrain flight duration in a short–distance migrant? Philosophical Transactions of the Royal Society B. 371: 20150386. Guillemette et al. 2016 Phil. Trans. Roy. Soc. B.

Portugal, S.J., Murn, C.P., Sparkes, E.S. and Daley, M.A. (2016) The fast and forceful kicking strikes of snake-hunting Secretary Birds (Sagittarius serpentarius). Current Biology. 26: 58-59. Portugal et al. 2016 Curr. Biol.

Biro, D. , Sasaki, T. and Portugal, S.J. (2016) Bringing a time-depth perspective to collective animal behaviour. Trends in Ecology and Evolution. 31: 550-562. Biro et al. 2016 TREE

Pollard, A., Pitsillides, A. & Portugal, S.J. (2016) Validating a non-invasive technique for monitoring embryo movement in ovo. Physiological and Biochemical Zoology. 89: 331-339. Pollard et al. 2016 PBZ

Brulez, K., Miksik, I., Cooney, C.R., Hauber, M.E., Lovell, P.G., Maurer, G., Portugal, S.J., Russell, D., S.J. Reynolds & Cassey, P.  (2016) Eggshell pigment composition co-varies with phylogeny but not with life history nor with nesting ecology traits of British passerines. Ecology and Evolution. 6: 1637-1645. Brulez et al. 2016 Ecol Eco

Portugal, S.J., Green, J.A., Halsey, L.G., Arnold, W., Careau, V., Dann, P., Frappell, P.B., Grémillet, D., Handrich, Y., Martin, G.R., Ruf, T., Guillemette, M. and Butler, P.J. (2016) Associations Between Resting, Activity and Daily metabolic rate in Free-living Endotherms: No Universal Rule for Birds and Mammals. Physiological and Biochemical Zoology. 89: 251-261. Portugal et al. 2016 PBZ

Shepard, E.L.C., Ross, A.N. and Portugal, S.J. (2016) Moving in a moving medium: New perspectives on flight. Philosophical Transactions of the Royal Society B. 371: 20150382. Shepard et al. 2016 Phil. Trans. Roy. Soc. B.

Portugal, S.J. (2016) Lissaman, Shollenberger and formation flight in birds. Journal of Experimental Biology. 219: 2778-2780. portugal-2016-jeb

2015

Voelkl, B., Portugal, S.J., Unsold, M., Usherwood, J.R., Wilson, A.M., & Fritz, J. (2015) Matching times of leading and following suggest cooperation through direct reciprocity during V-formation flight of Northern bald ibis. PNAS (Proceedings of the National Academy of Sciences of the United States). 112: 2115-2120. Voelkl et al. 2015 PNAS (http://www.pnas.org/content/112/7/2115.abstract)

Maurer, G., Portugal, S.J., Hauber, M.E., Miksik, I., Russell, D.G. & Cassey, P. (2015) First light for avian embryos: eggshell thickness and pigmentation mediate variation in development and UV exposure in wild bird eggs. Functional Ecology. 29: 209-218.(http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.12314/abstract) Maurer et al. 2015

Portugal, S.J., Maurer, G., Thomas, G.H., Hauber, M.E., Grim, T. & Cassey, P. (2015) Nesting behaviour influences species-specific gas exchange across avian eggshells. Journal of Experimental Biology. 217: 3326-3332. (http://jeb.biologists.org/content/217/18/3326.shortPortugal et al. 2015 JEB

2014

Portugal, S. J., Hubel, T. Y., Hailes, S., Heese, S., Trobe, D., Voekl, B., Fritz, J., Wilson, A. & Usherwood, J. (2014) Position and flap phasing between ibises in formation flight: evidence for upwash exploitation and downwash avoidance? Nature. 505: 399-402. Watch documentary here. (http://www.nature.com/nature/journal/v505/n7483/full/nature12939.htmlPortugal et al. 2014 Nature

Portugal, S.J., Maurer, G., Thomas, G.H., Hauber, M.E., Grim, T. & Cassey, P. (2014) Nesting behaviour influences species-specific gas exchange across avian eggshells. Journal of Experimental Biology. 217: 3326-3332. (http://jeb.biologists.org/content/217/18/3326.shortPortugal et al. 2014 JEB

Portugal, S.J., Hauber M. E., Maurer, G., Stokke, B. G., Grim, T. & Cassey, P. (2014) Early hatching of an avian brood parasites embryo cannot be explained by enhanced gaseous exchange across the eggshell.  Journal of Zoology. 293: 219-226. (http://onlinelibrary.wiley.com/doi/10.1111/jzo.12144/abstractPortugal et al. 2014 JoZ

Brulez, K., Choudhary, P. K., Maurer, G., Portugal, S. J., Boulton, R. L., Webber, S. L. & Cassey, P. (2014) A note on the repeatability of visually scoring eggshell patterns. Journal of Ornithology. 155: 701-706. (http://link.springer.com/article/10.1007/s10336-014-1053-9Brulez et al. JoO 2014

2013

Alton, L. A., Portugal, S. J. & White, C. R. (2013) Balancing the competing requirements and display-behaviour during male-male interactions in Siamese fighting fish, Betta splendens. Comparative and Biochemical Physiology. 164: 363-367.(http://www.sciencedirect.com/science/article/pii/S1095643312005193). Alton et al. CBP 2013

White, C. R., Cassey, P., Schimpf, N., Green, J. A., Halsey, L. G. & Portugal, S. J. (2013) Implantation reduces the negative effects of bio-logging devices on birds. Journal of Experimental Biology.  216: 537-542. (http://jeb.biologists.org/content/216/4/537.fullWhite et al. 2013 JEB

Portugal, S. J., Green, J. A., White, C. R., Guillemette, M. & Butler, P. J. (2013) Wild geese do not increase flight behaviour prior to migration. Biology Letters. 8: 469-472. (http://rsbl.royalsocietypublishing.org/content/early/2011/11/07/rsbl.2011.0975.fullPortugal et al. Bio Lett 2013

2012

Guillemette, M. G., Richman, S. E., Portugal, S. J., & Butler, P. J. (2012) Behavioural compensation reduces energy expenditure during migration hyperphagia in a large bird. Functional Ecology. 26: 876-883. (http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2435.2012.01993.x/abstractGuillemette et al. FeC 2012

Martin, G. R., Portugal, S. J. & Murn, C. P. (2012) Visual fields, foraging and collision vulnerability in Gyps vultures. Ibis. 154: 626-631. (http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919X.2012.01227.x/abstractMartin et al. Ibis 2012

Cassey, P., Thomas, G., Portugal, S. J., Maurer, G., Hauber, M., Grim, T., Lovell, G. & Mikšík, I. (2012) Why birds paint their eggs: eggshell pigments covary with life history and nesting ecology among British birds. Biological Journal of the Linnean Society. 106: 657-672. (http://onlinelibrary.wiley.com/doi/10.1111/j.1095-8312.2012.01877.x/abstractCassey et al. BJLS 2012

Cassey, P., Mikšík, I., Portugal, S. J., Maurer, G., Ewen, J. G., Zarate, E., Sewell, M. A., Grim, T.& Hauber, M. (2012) How costly is producing a colourful egg? A trade-off hypothesis between eggshell pigments and maternal egg constituents in Turdus thrushes. Journal of Avian Biology. 43: 503-512. (http://onlinelibrary.wiley.com/doi/10.1111/j.1600-048X.2012.05576.x/abstractCassey et al. JAB 2012

Maurer, G., Portugal, S. J. & Cassey, P. (2012) An assessment of measurements and indices of eggshell thickness and its variation with egg region and shape in European birds. Ibis. 154: 714-724. (http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919X.2012.01244.x/abstractMaurer et al. Ibis 2012

2011

Portugal, S. J. & Guillemette, M. G. (2011) The use of body mass loss to estimate metabolic rate in birds. Comparative and Biochemical Physiology A. 158: 329-336. (http://www.sciencedirect.com/science/article/pii/S1095643310005489Portugal & Guillemette CBP 2010

Portugal, S. J., Butler, P. J., Green, J. A. & Cassey, P. (2011) Indications of phenotypic plasticity in moulting birds: captive geese reveal adaptive changes in mineralisation of their long bones during wing moult. Journal of Ornithology. 152: 1055-1061. (http://www.springerlink.com/content/6437466461022617/Portugal et al. JoO 2011

Portugal, S. J. & Guillemain, M. (2011) Vigilance patterns of wintering Eurasian wigeon: female benefits from male low-cost behaviour. Journal of Ornithology. 152: 661-668. (http://www.springerlink.com/content/v1k64445552l0v31/Portugal & Guillemain JoO 2011

Portugal, S. J., Green, J. A., Piersma, T., Eichhorn, G. & Butler, P. J. (2011) Energy stores enable flightless moulting geese to maintain cryptic behaviour. Ibis. 153: 868-874. (http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919X.2011.01167.x/abstract) Portugal et al. Ibis 2011

Maurer, G., Portugal, S. J. & Cassey, P. (2011) Review: an embryos eye view of eggshell pigmentation in birds. Journal of Avian Biology. 42: 494-504. (http://onlinelibrary.wiley.com/doi/10.1111/j.1600-048X.2011.05368.x/abstractMaurer, Portugal & Cassey JAB 2011

Maurer, G., Portugal, S. J., Boomer, I & Cassey, P. (2011) Avian embryonic development does not change the stable isotope composition of the calcite eggshell. Reproduction, Fertility and Development. 23: 339-345. (http://dx.doi.org/10.1071/RD10138Maurer et al. 2011 RFD

Maurer, G., Portugal, S. J. & Cassey, P. (2011) Cryptic patterning reveals separate mechanical and gas conductance functions of bird egg speckles. Journal of Zoology. 285: 194-204. (http://onlinelibrary.wiley.com/doi/10.1111/j.1469-7998.2011.00830.x/abstractMaurer et al. JoZ 2011

Martin, G. R. & Portugal, S. J. (2011) Feeding ecology dictates visual field topography in Ibis and Spoonbills. Ibis. 153: 662-671. (http://onlinelibrary.wiley.com/doi/10.1111/j.1474-919X.2011.01151.x/abstractMartin & Portugal Ibis 2011

2010

Portugal, S. J., Quinton, K., Isaac, R. & Reynolds, S. J. (2010) Do captive waterfowl respond to the flightless period of wing moult in the same manner as their wild counterparts? Journal of Ornithology. 151: 443-448.(http://www.springerlink.com/content/b5154v68m9322324/Portugal et al. 2010 JoO

Portugal, S. J., Cooper, H. J., Zamprione, C. D., Wallace, L. L. & Cassey, P. (2010) Can museum egg specimens be used for proteomic analyses? Proteome Science. 8: 40. (http://www.proteomesci.com/content/8/1/40/abstractPortugal et al. P 2010

Portugal, S. J., Maurer, G. & Cassey, P. (2010) Eggshell permeability: A standard technique for determining inter-specific rates of water vapour conductance. Physiological and Biochemical Zoology. 83: 1023-1031.(http://www.jstor.org/stable/10.1086/656287Portugal et al. PBZ 2010

Cassey, P., Portugal, S. J., Maurer, G., Boulton, R., Hauber, M., Ewen, J. & Blackburn, T. M. (2010) A comparative study of the evolutionary variability in eggshell colour of birds.  PLoS One. 5: e1205 (http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0012054Cassey et al. PLoS 2010

2009

Portugal, S. J., Green, J. A., Cassey, P., Frappell, P. B. & Butler, P. J. (2009) Predicting the rate of oxygen consumption from heart rate in barnacle geese: effects of captivity and annual changes in body condition. Journal of Experimental Biology. 212: 2941-2948. (http://jeb.biologists.org/content/212/18/2941.shortPortugal et al. JEB 2009a

Portugal, S. J., Thorpe, S. K. S., Green, J. A., Myatt, J. P. & Butler, P. J. (2009) Testing the use/disuse hypothesis: pectoral and leg muscle changes in captive barnacle geese during wing moult. Journal of Experimental Biology. 212: 2403-2410.(http://jeb.biologists.org/content/212/15/2403.shortPortugal et al. JEB 2009

Halsey, L. G., Portugal, S. J., Smith, J. A., Murn, C. A. & Wilson, R. P. (2009) Recording raptor behaviour on the wing via accelerometry. Journal of Field Ornithology. 80: 171-177. (http://onlinelibrary.wiley.com/doi/10.1111/j.1557-9263.2009.00219.x/abstractHalsey et al. JFO 2009

2007

Portugal, S. J., Green, J. A. & Butler, P. J. (2007) Annual changes in body mass and resting metabolism in captive barnacle geese: the importance of wing moult. Journal of Experimental Biology. 210: 1391-1397.(http://jeb.biologists.org/content/210/8/1391.shortPortugal et al. JEB 2007

2006

White, C. R., Portugal, S. J., Martin, G. R. & Butler, P. J. (2006) Respirometry: Anhydrous Drierite equilibrates with carbon dioxide and increases washout times. Physiological and Biochemical Zoology. 79: 977-980.(http://www.jstor.org/stable/10.1086/505994White et al. PBZ 2006

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