Dr Steve Portugal

  1. 2020
  2. E-pub ahead of print

    Ineffectiveness of light emitting diodes as underwater deterrents for long-tailed ducks Clangula hyemalis

    Cantlay, J., Bond, A. L., Wells-Berlin, A. M., Crawford, R., Martin, G. R., Rouxel, Y., Peregoy, S., McGrew, K. A. & Portugal, S., 7 May 2020, In : Global Ecology and Conservation. e01102.

    Research output: Contribution to journalArticle

  3. Published

    Bird flocks

    Portugal, S., 9 Mar 2020, In : Current Biology . 30, 5, p. 206-210 5 p.

    Research output: Contribution to journalArticle

  4. Published

    Mechanics of flight feathers: effects of captivity?

    Portugal, S., Nudds, R., Green, J., Alexander, R. M., Butler, P. & Ker, R., 2020, In : bioRxiv.

    Research output: Contribution to journalArticle

  5. Published

    Overall dynamic body acceleration as an indicator of dominance in homing pigeons

    Ricketts, R., Sankey, D., Tidswell, B., Brown, J., Deegan, J. & Portugal, S., 2020, In : bioRxiv.

    Research output: Contribution to journalArticle

  6. Submitted

    Pre-winter fattening and fat loss during wing moult: the annual cycle of fat deposition in captive barnacle geese (Branta leucopsis).

    Portugal, S., McGill, R., Green, J. & Butler, P., 2020, (Submitted) In : bioRxiv.

    Research output: Contribution to journalArticle

  7. Published

    The determinants of aggression in male Siamese fightingfish, Betta splendens

    McGoran, R., Papworth, S. & Portugal, S., 2020, In : bioRxiv.

    Research output: Contribution to journalArticle

  8. 2019
  9. Published

    Speed consensus and the ‘Goldilocks principle’ in flocking birds (Columba livia)

    Sankey, D., Shepard, E., Biro, D. & Portugal, S., Nov 2019, In : Animal Behaviour. 157, p. 105-119 15 p.

    Research output: Contribution to journalArticle

  10. E-pub ahead of print

    Weak asymmetric interspecific aggression and divergent habitat preferences at an elevational contact zone between tropical songbirds

    Jones, S., Tobias, J., Freeman, R. & Portugal, S., 26 Oct 2019, In : Ibis. p. 1-29 29 p.

    Research output: Contribution to journalArticle

  11. E-pub ahead of print

    When flocking is costly: reduced cluster-flock density over long-duration flight in pigeons

    Sankey, D. & Portugal, S., 15 Jul 2019, In : The Science of Nature . 106, p. 1-5 5 p., 47.

    Research output: Contribution to journalArticle

  12. E-pub ahead of print

    Impacts of “supermoon” events on the physiology of a wild bird

    Portugal, S., White, C., Frappell, P., Green, J. & Butler, P., 25 Jun 2019, In : Ecology and Evolution. 9, 14, p. 7974-7984 11 p.

    Research output: Contribution to journalArticle

  13. Published

    Birds invest wingbeats to keep a steady head and reap the ultimate benefits of flying together

    Taylor, L., Taylor, G., Biro, D., Lambert, B., Walker, J. & Portugal, S., 18 Jun 2019, In : PLoS Biology. 17, 6, p. 1-20 20 p., e3000299.

    Research output: Contribution to journalArticle

  14. Published

    Convergent evolution of reduced eggshell conductance in avian brood parasites

    Mcclelland, S., Jamie, G., Waters, K., Caldas, L., Spottiswoode, C. & Portugal, S., Apr 2019, In : Philosophical Transactions of the Royal Society of London B: Biological Sciences. 374, 1769, p. 1-12 12 p.

    Research output: Contribution to journalArticle

  15. Published

    The coevolutionary biology of brood parasitism: a call for integration

    Thorogood, R., Spottiswoode, C., Portugal, S. & Gloag, R., Apr 2019, In : Philosophical Transactions of the Royal Society of London B: Biological Sciences. 374, 1769, p. 1-7 7 p.

    Research output: Contribution to journalArticle

  16. Published

    The origin and maintenance of metabolic allometry in animals

    White, C. R., Marshall, D. J., Alton, L. A., Arnold, P. A., Beaman, J. E., Bywater, C. L., Condon, C., Crispin, T. S., Janetzki, A., Pirtle, E., Winwood-Smith, H. S., Angilletta, M. J., Chenoweth, S. F., Franklin, C. E., Halsey, L. G., Kearney, M. R., Portugal, S. J. & Ortiz-Barrientos, D., 18 Mar 2019, In : Nature Ecology and Evolution. 3, p. 598-603 6 p.

    Research output: Contribution to journalArticle

  17. E-pub ahead of print

    Visual fields and foraging ecology of Blacksmith Lapwings Vanellus armatus

    Cantlay, J., Portugal, S. & Martin, G., 14 Mar 2019, In : Ibis. p. 1-6 6 p.

    Research output: Contribution to journalArticle

  18. 2018
  19. Published

    Flight feather moult drives minimum daily heart rate in wild geese

    Portugal, S., White, C., Green, J. & Butler, P., Nov 2018, In : Biology Letters. 14, 11, p. 1-4 4 p.

    Research output: Contribution to journalArticle

  20. Published

    Miniaturisation of biologgers is not alleviating the 5% rule

    Portugal, S. & White, C., Jul 2018, In : Methods in ecology and evolution. 9, 7, p. 1662-1666 5 p.

    Research output: Contribution to journalArticle

  21. Published

    A rare mineral, vaterite, acts as a shock absorber in the eggshell of a communally nesting bird

    Portugal, S., Bowen, J. & Riehl, C., 3 Jan 2018, In : Ibis. 160, 1, p. 173-178 6 p.

    Research output: Contribution to journalArticle

  22. 2017
  23. Published

    Life in a bubble: the role of the labyrinth organ in determining territory, mating and aggressive behaviours in Anabantoid fishes

    Tate, M., McGoran, R., White, C. & Portugal, S., Sep 2017, In : Journal of Fish Biology. 91, 3, p. 723-749 27 p.

    Research output: Contribution to journalArticle

  24. Published

    Boldness traits, not dominance, predicts exploratory flight range and homing behaviour in homing pigeons

    Portugal, S., Ricketts, R., Chappell, J., White, C., Shepard, E. & Biro, D., Aug 2017, In : Philosophical Transactions of the Royal Society of London B: Biological Sciences. 372, 1727, p. 1-10 10 p.

    Research output: Contribution to journalArticle

  25. Published

    It Takes Time to Be Cool: On the Relationship between Hyperthermia and Body Cooling in a Migrating Seaduck

    Guillemette, M., Polymeropoulos, E., Portugal, S. & Pelletier, D., 25 Jul 2017, In : Frontiers in Physiology. 8, p. 1-10 10 p., 532.

    Research output: Contribution to journalArticle

  26. Published

    Perch height predicts dominance rank in birds

    Portugal, S., Sivess, L., Martin, G., Butler, P. & White, C., Apr 2017, In : Ibis. 159, 2, p. 456–462 7 p.

    Research output: Contribution to journalArticle

  27. Published

    White‐headed Vulture Trigonoceps occipitalis shows visual field characteristics of hunting raptors

    Portugal, S., Murn, C. & Martin, G., Apr 2017, In : Ibis. 159, 2, p. 463–466 4 p.

    Research output: Contribution to journalArticle

  28. Published

    Homing pigeons (Columba livia) modulate wingbeat characteristics as a function of route familiarity

    Taylor, L., Portugal, S. & Biro, D., 2017, In : Journal of Experimental Biology. 220, 16, p. 2908-2915 8 p.

    Research output: Contribution to journalArticle

  29. 2016
  30. Published

    Does hyperthermia constrain flight duration in a short-distance migrant?

    Guillemette, M. & Portugal, S., 26 Sep 2016, In : Philosophical Transactions of the Royal Society of London B: Biological Sciences. 371, 1704, p. 1-8 8 p.

    Research output: Contribution to journalArticle

  31. Published

    Bringing a Time–Depth Perspective to Collective Animal Behaviour

    Biro, D., Sasaki, T. & Portugal, S., Jul 2016, In : Trends in Ecology and Evolution. 31, 7, p. 550–562 13 p.

    Research output: Contribution to journalArticle

  32. E-pub ahead of print

    Validating a Noninvasive Technique for Monitoring Embryo Movement In Ovo

    Pollard, A., Pitsillides, A. & Portugal, S., 16 May 2016, In : Physiological and Biochemical Zoology. 89, 4, p. 331-339 9 p.

    Research output: Contribution to journalArticle

  33. Published

    Associations Between Resting, Activity and Daily metabolic rate in Free-living Endotherms: No Universal Rule for Birds and Mammals

    Portugal, S., Green, J., Halsey, L. & Butler, P., 14 Apr 2016, In : Physiological and Biochemical Zoology. 89, 3

    Research output: Contribution to journalArticle

  34. Published

    Eggshell pigment composition covaries with phylogeny but not with life history or with nesting ecology traits of British passerines

    Brulez, K., Portugal, S. & Cassey, P., Mar 2016, In : Ecology and Evolution. 6, 6, p. 1637–1645 9 p.

    Research output: Contribution to journalArticle

  35. Published

    The fast and forceful kicking strike of the secretary bird

    Portugal, S., Campbell, M., Sparkes, E. & Daley, M., 25 Jan 2016, In : Current Biology. 26, 2, p. 58-59 2 p.

    Research output: Contribution to journalArticle

  36. 2015
  37. Published

    Matching times of leading and following suggest cooperation through direct reciprocity during V-formation flight in ibis

    Voelkl, B., Portugal, S., Unsold, M., Usherwood, J., Wilson, A. & Fritz, J., 17 Feb 2015, In : Proceedings of the National Academy of Sciences of the United States of America. 112, 7, p. 2115–2120 6 p.

    Research output: Contribution to journalArticle

  38. Published

    First light for avian embryos: eggshell thickness and pigmentation mediate variation in development and UV exposure in wild bird eggs

    Maurer, G., Portugal, S., Hauber, M. E., Mikšík, I., Russell, D. G. D. & Cassey, P., Feb 2015, In : Functional Ecology. 29, 2, p. 209-218 10 p.

    Research output: Contribution to journalArticle

  39. 2014
  40. Published

    Nesting behaviour influences species-specific gas exchange across avian eggshells

    Portugal, S., Maurer, G. & Cassey, P., 15 Jul 2014, In : Journal of Experimental Biology.. 217, 18, p. 3326-3332 6 p., 10.1242/jeb.103291.

    Research output: Contribution to journalArticle

  41. Published

    Visual scoring of eggshell patterns has poor repeatability

    Brulez, K., Choudhary, P. K., Maurer, G., Portugal, S. J., Boulton, R. L., Webber, S. L., Cassey, P. & Portugal, S., 1 Jul 2014, In : Journal of Ornithology . 155, 3, p. 701-706 6 p.

    Research output: Contribution to journalArticle

  42. Published

    Upwash exploitation and downwash avoidance by flap phasing in ibis formation flight

    Portugal, S., Hubel, T. Y., Fritz, J., Heese, S., Trobe, D., Voelkl, B., Hailes, S., Wilson, A. M. & Usherwood, J. R., 15 Jan 2014, In : Nature. 505, p. 399-402 4 p.

    Research output: Contribution to journalArticle

  43. Published

    Rapid development of brood-parasitic cuckoo embryos cannot be explained by increased gas exchange through the eggshell

    Portugal, S. J., Hauber, M. E., Maurer, G., Stokke, B. G., Grim, T. & Cassey, P., 1 Jan 2014, In : Journal of Zoology . 293, 4, p. 219-226 8 p.

    Research output: Contribution to journalArticle

  44. 2013
  45. Published

    Implantation reduces the negative effects of bio-logging devices on birds

    White, C. & Portugal, S., 4 Apr 2013, In : Journal of Experimental Biology.. 216, p. 537-542

    Research output: Contribution to journalArticle

  46. Published

    Balancing the competing requirements of air-breathing and display behaviour during male-male interactions in Siamese fighting fish Betta splendens

    Alton, L. A., Portugal, S. J., White, C. R. & Portugal, S., 1 Feb 2013, In : Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology. 164, 2, p. 363-367 5 p.

    Research output: Contribution to journalArticle

  47. 2012
  48. Published

    Avian eggshell pigments are not consistently correlated with colour measurements or egg constituents in two Turdus thrushes

    Cassey, P., Mikšík, I., Portugal, S. J., Maurer, G., Ewen, J. G., Zarate, E., Sewell, M. A., Karadas, F., Grim, T., Hauber, M. E. & Portugal, S., 1 Nov 2012, In : Journal of Avian Biology. 43, 6, p. 503-512 10 p.

    Research output: Contribution to journalArticle

  49. Published

    A comparison of indices and measured values of eggshell thickness of different shell regions using museum eggs of 230 European bird species

    Maurer, G., Portugal, S. J., Cassey, P. & Portugal, S., 1 Oct 2012, In : Ibis. 154, 4, p. 714-724 11 p.

    Research output: Contribution to journalArticle

  50. Published

    Behavioural compensation reduces energy expenditure during migration hyperphagia in a large bird

    Guillemette, M., Richman, S. E., Portugal, S. J., Butler, P. J. & Portugal, S., 1 Aug 2012, In : Functional Ecology. 26, 4, p. 876-883 8 p.

    Research output: Contribution to journalArticle

  51. Published

    Visual fields, foraging and collision vulnerability in Gyps vultures

    Martin, G. R., Portugal, S. J., Murn, C. P. & Portugal, S., 1 Jul 2012, In : Ibis. 154, 3, p. 626-631 6 p.

    Research output: Contribution to journalArticle

  52. Published

    Why are birds' eggs colourful? Eggshell pigments co-vary with life-history and nesting ecology among British breeding non-passerine birds

    Cassey, P., Thomas, G. H., Portugal, S. J., Maurer, G., Hauber, M. E., Grim, T., Lovell, P. G., Mikšík, I. & Portugal, S., 1 Jul 2012, In : Biological Journal of the Linnean Society. 106, 3, p. 657-672 16 p.

    Research output: Contribution to journalArticle

  53. Published

    Wild geese do not increase flight behaviour prior to migration

    Portugal, S. J., Green, J. A., White, C. R., Guillemette, M., Butler, P. J. & Portugal, S., 23 Jun 2012, In : Biology Letters. 8, 3, p. 469-72 4 p.

    Research output: Contribution to journalArticle

  54. 2011
  55. Published

    Review: An embryo's eye view of avian eggshell pigmentation

    Maurer, G., Portugal, S. J., Cassey, P. & Portugal, S., 1 Nov 2011, In : Journal of Avian Biology. 42, 6, p. 494-504 11 p.

    Research output: Contribution to journalArticle

  56. Published

    Speckles of cryptic black-headed gull eggs show no mechanical or conductance structural function

    Maurer, G., Portugal, S. J., Mikšík, I. & Cassey, P., 1 Nov 2011, In : Journal of Zoology . 285, 3, p. 194-204 11 p.

    Research output: Contribution to journalArticle

  57. Published

    Differences in foraging ecology determine variation in visual fields in ibises and spoonbills (Threskiornithidae)

    Martin, G. R., Portugal, S. J. & Portugal, S., 1 Oct 2011, In : Ibis. 153, 4, p. 662-671 10 p.

    Research output: Contribution to journalArticle

  58. Published

    Greater energy stores enable flightless moulting geese to increase resting behaviour

    Portugal, S. J., Green, J. A., Piersma, T., Eichhorn, G., Butler, P. J. & Portugal, S., 1 Oct 2011, In : Ibis. 153, 4, p. 868-874 7 p.

    Research output: Contribution to journalArticle

  59. Published

    Indications of phenotypic plasticity in moulting birds: Captive geese reveal adaptive changes in mineralisation of their long bones during wing moult

    Portugal, S. J., Butler, P. J., Green, J. A., Cassey, P. & Portugal, S., 1 Oct 2011, In : Journal of Ornithology . 152, 4, p. 1055-1061 7 p.

    Research output: Contribution to journalArticle

  60. Published

    Vigilance patterns of wintering Eurasian Wigeon: Female benefits from male low-cost behaviour

    Portugal, S. J., Guillemain, M. & Portugal, S., 1 Jul 2011, In : Journal of Ornithology . 152, 3, p. 661-668 8 p.

    Research output: Contribution to journalArticle

  61. Published

    The use of body mass loss to estimate metabolic rate in birds

    Portugal, S. J., Guillemette, M. & Portugal, S., 1 Mar 2011, In : Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology. 158, 3, p. 329-336 8 p.

    Research output: Contribution to journalArticle

  62. Published

    Avian embryonic development does not change the stable isotope composition of the calcite eggshell

    Maurer, G., Portugal, S. J., Boomer, I. & Cassey, P., 24 Jan 2011, In : Reproduction, Fertility and Development. 23, 2, p. 339-345 7 p.

    Research output: Contribution to journalArticle

  63. 2010
  64. Published

    Eggshell permeability: A standard technique for determining interspecific rates of water vapor conductance

    Portugal, S., Maurer, G., Cassey, P. & Portugal, S., 1 Nov 2010, In : Physiological and Biochemical Zoology. 83, 6, p. 1023-1031 9 p.

    Research output: Contribution to journalArticle

  65. Published

    Variability in avian eggshell colour: A comparative study of museum eggshells

    Cassey, P., Portugal, S. J., Maurer, G., Ewen, J. G., Boulton, R. L., Hauber, M. E., Blackburn, T. M. & Portugal, S., 15 Oct 2010, In : PLoS ONE. 5, 8, e12054.

    Research output: Contribution to journalArticle

  66. Published

    Can museum egg specimens be used for proteomic analyses?

    Portugal, S. J., Cooper, H. J., Zampronio, C. G., Wallace, L. L., Cassey, P. & Portugal, S., 14 Jul 2010, In : Proteome Science. 8, 40.

    Research output: Contribution to journalArticle

  67. Published

    Do captive waterfowl alter their behaviour patterns during their flightless period of moult?

    Portugal, S. J., Isaac, R., Quinton, K. L., Reynolds, S. J. & Portugal, S., 1 Jan 2010, In : Journal of Ornithology . 151, 2, p. 443-448 6 p.

    Research output: Contribution to journalArticle

  68. 2009
  69. Published

    Testing the use/disuse hypothesis: Pectoral and leg muscle changes in captive barnacle geese Branta leucopsis during wing moult

    Portugal, S. J., Thorpe, S. K. S., Green, J. A., Myatt, J. P., Butler, P. J. & Portugal, S., 1 Aug 2009, In : Journal of Experimental Biology. 212, 15, p. 2403-2410 8 p.

    Research output: Contribution to journalArticle

  70. Published

    Recording raptor behavior on the wing via accelerometry

    Halsey, L. G., Portugal, S. J., Smith, J. A., Murn, C. P., Wilson, R. P. & Portugal, S., 1 Jun 2009, In : Journal of Ornithology . 80, 2, p. 171-177 7 p.

    Research output: Contribution to journalArticle

  71. Published

    Predicting the rate of oxygen consumption from heart rate in barnacle geese: effects of captivity and annual changes in body condition.

    Portugal, S., 9 Apr 2009, In : Journal of Experimental Biology.. 212, p. 2941-2948 doi:10.1242/jeb.034546.

    Research output: Contribution to journalArticle

  72. Published

    Birds of a feather

    Portugal, S. & Jones, T., 1 Mar 2009, In : Planet Earth. SPRING, p. 24-25 2 p.

    Research output: Contribution to journalArticle

  73. 2008
  74. Published
  75. 2007
  76. Published

    Annual changes in body mass and resting metabolism in captive barnacle geese (Branta leucopsis): the importance of wing moult

    Portugal, S. J., Green, J. A. & Butler, P. J., 31 Mar 2007, In : Journal of Experimental Biology. 210, p. 1391-1397 7 p.

    Research output: Contribution to journalArticle

  77. 2006
  78. Published

    Respirometry: Anhydrous drierite equilibrates with carbon dioxide and increases washout times

    White, C. R., Portugal, S. J., Martin, G. R., Butler, P. J. & Portugal, S., 1 Sep 2006, In : Physiological and Biochemical Zoology. 79, 5, p. 977-980 4 p.

    Research output: Contribution to journalArticle