Marcel Eens

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Articles in Scholarly Journals [Incomplete List]

  1. Phenotypic correlates of digit ratio in a wild bird: implications for the study of maternal effects
    Animal Behaviour, vol. 74, no. 3, pp. 641–647, 2007
  2. PFOS levels in the blood and liver of a small insectivorous songbird near a fluorochemical plant
    Environment International, vol. 33, no. 3, pp. 357–361, 2007
  3. Plasma testosterone levels of male European starlings (Sturnus vulgaris) during the breeding cycle and in relation to song and paternal care
    Behaviour, vol. 144, no. 4, pp. 393–410, 2007
  4. Kinetics of primary antibody responses to sheep red blood cells in birds: a literature review and new data from great tits and European starlings
    Animal Biology, vol. 57, no. 1, pp. 79–95, 2007
  5. Seasonal singing patterns and individual consistency in song activity in female European starlings (Sturnus vulgaris)
    Behaviour, vol. 144, no. 6, pp. 663–680, 2007
  6. Age-Dependent Expression of Song in the Collared Flycatcher, Ficedula albicollis
    Ethology, vol. 113, no. 3, pp. 246–256, 2007
  7. Calcium availability influences lead accumulation in a passerine bird
    Animal Biology, vol. 56, no. 3, pp. 289–298, 2006
  8. Indicators of physiological stress and the elaboration of sexual traits in the collared flycatcher
    Behavioral Ecology, vol. 17, no. 3, pp. 399–404, 2006
  9. The evolution of song in female birds in Europe
    Behavioral Ecology, vol. 18, no. 1, pp. 86–96, 2006
  10. Effects of heavy metal exposure on the condition and health of adult great tits (Parus major)
    Environmental Pollution, vol. 140, no. 1, pp. 71–78, 2006
  11. In vivo MR imaging of the seasonal volumetric and functional plasticity of song control nuclei in relation to song output in a female songbird
    NeuroImage, vol. 31, no. 3, pp. 981–992, 2006
  12. Heterospecific song matching in two closely related songbirds (Parus major and P. caeruleus): great tits match blue tits but not vice versa
    Behavioral Ecology and Sociobiology, vol. 60, no. 2, pp. 260–269, 2006
  13. Can predatory bird feathers be used as a non-destructive biomonitoring tool of organic pollutants?
    Biology Letters, vol. 2, no. 2, pp. 283–285, 2006
  14. Environmental Science & Technology, vol. 40, no. 17, pp. 5297–5303, 2006
  15. Determinants of male territorial behavior in a Hungarian collared flycatcher population: plumage traits of residents and challengers
    Behavioral Ecology and Sociobiology, vol. 60, no. 5, pp. 663–671, 2006
  16. A link between eumelanism and calcium physiology in the barn owl
    Naturwissenschaften, vol. 93, no. 9, pp. 426–430, 2006
  17. Evaluation of biochemical effects related to perfluorooctane sulfonic acid exposure in organohalogen-contaminated great tit () and blue tit () nestlings
    Chemosphere, vol. 61, no. 11, pp. 1558–1569, 2005
  18. Experimental removal of the male parent negatively affects growth and immunocompetence in nestling great tits
    Oecologia, vol. 145, no. 4, pp. 670–670, 2005
  19. Heavy metal pollution affects dawn singing behaviour in a small passerine bird
    Oecologia, vol. 145, no. 3, pp. 504–509, 2005
  20. Fish community responses to metal pollution
    Environmental Pollution, vol. 138, no. 2, pp. 338–349, 2005
  21. The reproductive success and quality of blue tits () in a heavy metal pollution gradient
    Environmental Pollution, vol. 136, no. 2, pp. 243–251, 2005
  22. The combined effect of lead exposure and high or low dietary calcium on health and immunocompetence in the zebra finch ()
    Environmental Pollution, vol. 134, no. 1, pp. 123–132, 2005
  23. Simultaneous treatment with an aromatase inhibitor and an anti-androgen decreases the likelihood of dawn song in free-living male great tits,
    Hormones and Behavior, vol. 48, no. 2, pp. 243–251, 2005
  24. Brominated flame retardants and organochlorine pollutants in eggs of little owls () from Belgium
    Environmental Pollution, vol. 136, no. 1, pp. 81–88, 2005
  25. Evidence for Opioid Involvement in the Regulation of Song Production in Male European Starlings (Sturnus vulgaris).
    Behavioral Neuroscience, vol. 119, no. 1, Article ID 2005-01705-023, 10 pages, 2005
  26. FEATHERS AS A NONDESTRUCTIVE BIOMONITOR FOR PERSISTENT ORGANIC POLLUTANTS
    Environmental Toxicology and Chemistry, vol. 24, no. 2, p. 442, 2005
  27. Sperm competition and sexually size dimorphic brains in birds
    Proceedings of the Royal Society B: Biological Sciences, vol. 272, no. 1559, pp. 159–166, 2005
  28. Unravelling animal personalities: how and why individuals consistently differ
    Behaviour, vol. 142, no. 9, pp. 1149–1157, 2005
  29. Complex female vocal behaviour of great and blue tits inside the nesting cavity
    Behaviour, vol. 142, no. 4, pp. 489–506, 2005
  30. Age-dependent health status and song characteristics in the barn swallow
    Behavioral Ecology, vol. 16, no. 3, pp. 580–591, 2005
  31. FEMALE SONG IN EUROPEAN STARLINGS: SEX DIFFERENCES, COMPLEXITY, AND COMPOSITION
    The Condor, vol. 107, no. 3, p. 559, 2005
  32. The evolution of hippocampus volume and brain size in relation to food hoarding in birds
    Ecology Letters, vol. 7, no. 12, pp. 1216–1224, 2004
  33. Opposite Changes in Plasma Testosterone and Corticosterone Levels Following a Simulated Territorial Challenge in Male Great Tits
    Behaviour, vol. 141, no. 4, pp. 451–467, 2004
  34. Sexually size dimorphic brains and song complexity in passerine birds
    Behavioral Ecology, vol. 16, no. 2, pp. 335–345, 2004
  35. Relationships between metal concentrations in great tit nestlings and their environment and food
    Environmental Pollution, vol. 131, no. 3, pp. 373–380, 2004
  36. The use of genetic tools for the evaluation of a potential migration barrier for the bullhead
    Journal of Fish Biology, vol. 64, no. 6, pp. 1737–1744, 2004
  37. Relationship between population size and genetic diversity in endangered populations of the European bullhead (Cottus gobio): implications for conservation
    Biological Conservation, vol. 115, no. 3, pp. 403–410, 2004
  38. Differential effects of testosterone on neuronal populations and their connections in a sensorimotor brain nucleus controlling song production in songbirds: a manganese enhanced-magnetic resonance imaging study
    NeuroImage, vol. 21, no. 3, pp. 914–923, 2004
  39. The effect of heavy metal exposure on egg size, eggshell thickness and the number of spermatozoa in blue tit Parus caeruleus eggs
    Environmental Pollution, vol. 129, no. 1, pp. 125–129, 2004
  40. Urinary testosterone-metabolite levels and dominance rank in male and female bonobos ( Pan paniscus )
    Primates, vol. 45, no. 2, pp. 89–96, 2004
  41. Effect of spatial crowding on aggressive behavior in a bonobo colony
    Zoo Biology, vol. 23, no. 5, pp. 383–395, 2004
  42. Urinary testosterone metabolite levels and aggressive behaviors in male and female bonobos(Pan paniscus)
    Aggressive Behavior, vol. 30, no. 5, pp. 425–434, 2004
  43. Brain space for a learned task: strong intraspecific evidence for neural correlates of singing behavior in songbirds
    Brain Research Reviews, vol. 44, no. 2-3, pp. 187–193, 2004
  44. Estimating the complexity of bird song by using capture-recapture approaches from community ecology
    Behavioral Ecology and Sociobiology, vol. 57, no. 4, pp. 305–317, 2004
  45. INTERACTIVE COMMUNICATION BETWEEN MALE AND FEMALE GREAT TITS (PARUS MAJOR) DURING THE DAWN CHORUS
    The Auk, vol. 121, no. 1, p. 184, 2004
  46. Urinary Testosterone Metabolite Levels in Captive Bonobos: Relationship with Age
    Folia Primatologica, vol. 75, no. 2, pp. 107–110, 2004
  47. Great Tit ( Parus major ) Nestlings as Biomonitors of Organochlorine Pollution
    Archives of Environmental Contamination and Toxicology, vol. 44, no. 1, pp. 89–96, 2003
  48. Effects of Heavy Metal Exposure on Aggressive Behavior in a Small Territorial Songbird
    Archives of Environmental Contamination and Toxicology, vol. 45, no. 1, pp. 121–127, 2003
  49. Castration does not decrease nonreproductive aggression in yearling male European starlings (Sturnus vulgaris)
    Hormones and Behavior, vol. 43, no. 3, pp. 394–401, 2003
  50. Are corticosterone levels a good indicator of food availability and reproductive performance in a kittiwake colony?
    Hormones and Behavior, vol. 43, no. 4, pp. 489–502, 2003
  51. Variation of heavy metals within and among feathers of birds of prey: effects of molt and external contamination
    Environmental Pollution, vol. 124, no. 3, pp. 429–436, 2003
  52. Effects of heavy metal exposure on the condition and health of nestlings of the great tit (Parus major), a small songbird species
    Environmental Pollution, vol. 126, no. 2, pp. 267–274, 2003
  53. Effect of age and testosterone on autumnal neurogenesis in male European starlings (Sturnus vulgaris)
    Behavioural Brain Research, vol. 143, no. 1, pp. 15–30, 2003
  54. Conservation Genetics, vol. 4, no. 2, pp. 129–140, 2003
  55. Seasonal fluctuations in plasma testosterone levels and diurnal song activity in free-living male great tits
    General and Comparative Endocrinology, vol. 134, no. 1, pp. 1–9, 2003
  56. Female presence affects male behavior and testosterone levels in the European starling (Sturnus vulgaris)
    Hormones and Behavior, vol. 44, no. 2, pp. 103–109, 2003
  57. Urinary Testosterone Metabolite Levels in Bonobos: A Comparison with Chimpanzees in Relation to Social System
    Behaviour, vol. 140, no. 5, pp. 683–696, 2003
  58. BREEDING PERFORMANCE OF GREAT TITS (PARUS MAJOR) ALONG A GRADIENT OF HEAVY METAL POLLUTION
    Environmental Toxicology and Chemistry, vol. 22, no. 5, p. 1140, 2003
  59. In vivo manganese-enhanced magnetic resonance imaging reveals connections and functional properties of the songbird vocal control system
    Neuroscience, vol. 112, no. 2, pp. 467–474, 2002
  60. SHORT- AND LONG-TERM EFFECTS OF MALE-LIKE CONCENTRATIONS OF TESTOSTERONE ON FEMALE EUROPEAN STARLINGS (STURNUS VULGARIS)
    The Auk, vol. 119, no. 2, p. 487, 2002
  61. Genetic diversity and condition factor: a significant relationship in Flemish but not in German populations of the European bullhead (Cottus gobio L.)
    Heredity, vol. 89, no. 4, pp. 280–287, 2002
  62. Seasonal changes in the densities of ?2-noradrenergic receptors are inversely related to changes in testosterone and the volumes of song control nuclei in male European starlings
    The Journal of Comparative Neurology, vol. 444, no. 1, pp. 63–74, 2002
  63. Context-Dependent Effects of Castration and Testosterone Treatment on Song in Male European Starlings
    Hormones and Behavior, vol. 42, no. 3, pp. 307–318, 2002
  64. Effects of Testosterone on Song, Aggression, and Nestling Feeding Behavior in Male Great Tits, Parus major
    Hormones and Behavior, vol. 41, no. 2, pp. 178–186, 2002
  65. HEAVY METALS AND SELENIUM IN FEATHERS OF GREAT TITS (PARUS MAJOR) ALONG A POLLUTION GRADIENT
    Environmental Toxicology and Chemistry, vol. 20, no. 12, p. 2815, 2001
  66. Sex-role reversal in vertebrates: behavioural and endocrinological accounts
    Behavioural Processes, vol. 51, no. 1-3, pp. 135–147, 2000
  67. THE EFFECT OF CASTRATION ON AGGRESSION IN THE NONBREEDING SEASON IS AGE-DEPENDENT IN MALE EUROPEAN STARLINGS
    Behaviour, vol. 137, no. 5, pp. 647–661, 2000
  68. DOES TESTOSTERONE AFFECT THE TRADE-OFF BETWEEN INVESTMENT IN SEXUAL/TERRITORIAL BEHAVIOUR AND PARENTAL CARE IN MALE GREAT TITS?
    Behaviour, vol. 137, no. 11, pp. 1503–1515, 2000
  69. Seasonal Changes in Courtship Song and the Medial Preoptic Area in Male European Starlings (Sturnus vulgaris)
    Hormones and Behavior, vol. 38, no. 4, pp. 250–261, 2000
  70. Shield Characteristics Are Testosterone-Dependent in Both Male and Female Moorhens
    Hormones and Behavior, vol. 37, no. 2, pp. 126–134, 2000
  71. Great and Blue Tits as Indicators of Heavy Metal Contamination in Terrestrial Ecosystems
    Ecotoxicology and Environmental Safety, vol. 44, no. 1, pp. 81–85, 1999
  72. Responses of Male Spotless Starlings Sturnus unicolor to Experimental Intraspecific Nest Parasitism Vary in Relation to the Nesting Stage
    Journal of Avian Biology, vol. 30, no. 1, p. 122, 1999
  73. Female song for mate attraction: an overlooked phenomenon?
    Trends in Ecology & Evolution, vol. 13, no. 8, pp. 322–323, 1998
  74. Copulation and mate-guarding patterns in polygynous European starlings,
    Animal Behaviour, vol. 54, no. 1, pp. 45–58, 1997
  75. Female European starlings increase their copulation solicitation rate when faced with the risk of polygyny
    Animal Behaviour, vol. 51, no. 5, pp. 1141–1147, 1996
  76. Age- and behavior-related variation in volumes of song control nuclei in male European starlings
    Journal of Neurobiology, vol. 30, no. 3, pp. 329–339, 1996
  77. Do female tree swallows guard their mates by copulating frequently? A comment on Whittingham et al.
    Animal Behaviour, vol. 50, no. 1, pp. 273–276, 1995
  78. Intraspecific Brood Parasitism in Two Tit Parus species: Occurrence and Responses to Experimental Parasitism
    Journal of Avian Biology, vol. 26, no. 2, p. 114, 1995
  79. Mate Desertion by Primary Female European Starlings at the End of the Nestling Stage
    Journal of Avian Biology, vol. 26, no. 3, p. 267, 1995
  80. Song learning in captive European starlings, Sturnus vulgaris
    Animal Behaviour, vol. 44, no. 6, pp. 1131–1143, 1992
  81. Intermediate clutches in the Starling (Sturnus vulgaris): replacement clutches, additional clutches of polygynous males or late first clutches?
    Journal of Ornithology, vol. 131, no. 2, pp. 141–150, 1990