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Pollutants increase song complexity and the volume of the brain area HVC in a songbird

Markman, Shai, Leitner, Stefan, Catchpole, Clive, Barnsley, Sara, Muller, Carsten T., Pascoe, David and Buchanan, Katherine L. 2008, Pollutants increase song complexity and the volume of the brain area HVC in a songbird, Plos one, vol. 3, no. 2, pp. 1-6, doi: 10.1371/journal.pone.0001674.

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Title Pollutants increase song complexity and the volume of the brain area HVC in a songbird
Author(s) Markman, Shai
Leitner, Stefan
Catchpole, Clive
Barnsley, Sara
Muller, Carsten T.
Pascoe, David
Buchanan, Katherine L.
Journal name Plos one
Volume number 3
Issue number 2
Start page 1
End page 6
Total pages 6
Publisher Public Library of Science
Place of publication San Francisco, Calif.
Publication date 2008-02-27
ISSN 1932-6203
Keyword(s) brain function
environmental exposure
Summary Environmental pollutants which alter endocrine function are now known to decrease vertebrate reproductive success. There is considerable evidence for endocrine disruption from aquatic ecosystems, but knowledge is lacking with regard to the interface between terrestrial and aquatic ecosystems. Here, we show for the first time that birds foraging on invertebrates contaminated with environmental pollutants, show marked changes in both brain and behaviour. We found that male European starlings (Sturnus vulgaris) exposed to environmentally relevant levels of synthetic and natural estrogen mimics developed longer and more complex songs compared to control males, a sexually selected trait important in attracting females for reproduction. Moreover, females preferred the song of males which had higher pollutant exposure, despite the fact that experimentally dosed males showed reduced immune function. We also show that the key brain area controlling male song complexity (HVC) is significantly enlarged in the contaminated birds. This is the first evidence that environmental pollutants not only affect, but paradoxically enhance a signal of male quality such as song. Our data suggest that female starlings would bias their choice towards exposed males, with possible consequences at the population level. As the starling is a migratory species, our results suggest that transglobal effects of pollutants on terrestrial vertebrate physiology and reproduction could occur in birds.
Language eng
DOI 10.1371/journal.pone.0001674
Field of Research 050204 Environmental Impact Assessment
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2008
Copyright notice ©2008, Markman et al.
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Document type: Journal Article
Collection: School of Life and Environmental Sciences
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