Dr Steve Portugal

  1. 2013
  2. 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 journalArticlepeer-review

  3. 2012
  4. 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 journalArticlepeer-review

  5. 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 journalArticlepeer-review

  6. 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 journalArticlepeer-review

  7. 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 journalArticlepeer-review

  8. 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 journalArticlepeer-review

  9. 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 journalArticlepeer-review

  10. 2011
  11. 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 journalArticlepeer-review

  12. 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 journalArticlepeer-review

  13. 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 journalArticlepeer-review