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dc.date.accessioned2020-06-03T18:37:43Z
dc.date.available2020-06-03T18:37:43Z
dc.date.created2019-07-26T14:08:27Z
dc.date.issued2019
dc.identifier.citationStøstad, Hanna Nyborg Rowe, Melissah Johnsen, Arild Tomasek, Oldrich Albrecht, Tomas Lifjeld, Jan Terje . Sperm head abnormalities are associated with excessive omega-6 fatty acids in two finch species feeding on sunflower seeds. Journal of Avian Biology. 2019, 50(3), 1-12
dc.identifier.urihttp://hdl.handle.net/10852/76603
dc.description.abstractIn a rapidly changing world, it is important to understand how urban environments impact wildlife. For example, supplementary feeding of birds, though well‐intended, might have unexpected negative effects on the health of individual animals. Sunflower seeds are commonly provided in garden bird feeders, but they contain high levels of linoleic acid (LA), an omega‐6 polyunsaturated fatty acid (PUFA). Omega‐6 PUFAs are associated with increased oxidative stress, which can damage cell membranes, and in particular sperm cells. We assessed the level of LA in the blood of two seed‐eating finch species, greenfinches Chloris chloris and hawfinches Coccothraustes coccothraustes , caught in and in environments with direct access to sunflower seed feeders (Norway), and compared these with the level of LA in a smaller number of individuals sampled in in a rural area with low incidence of sunflower seed feeders (Czech Republic). Furthermore, we investigated the relationship between the proportion of LA in the blood (as well as the proportion of 10 other fatty acids) and sperm quality (the frequency of sperm head abnormalities and sperm swimming speed). We found that both finch species, but particularly greenfinches caught near feeders, exhibited levels of LA that were considerably higher than those previously reported for other wild birds. We also found that the proportion of LA was positively correlated with the frequency of abnormal sperm heads (sperm missing the acrosome), while there was no significant effect of fatty acid composition on sperm swimming speed. Our results indicate that the sperm quality of finches may be negatively affected by a high intake of sunflower seeds, adding to a growing body of research showing that supplementary feeding may have detrimental side effects for urban animals. This is particularly relevant for the greenfinch, which is currently affected by disease and population declines.
dc.languageEN
dc.titleSperm head abnormalities are associated with excessive omega-6 fatty acids in two finch species feeding on sunflower seeds
dc.typeJournal article
dc.creator.authorStøstad, Hanna Nyborg
dc.creator.authorRowe, Melissah
dc.creator.authorJohnsen, Arild
dc.creator.authorTomasek, Oldrich
dc.creator.authorAlbrecht, Tomas
dc.creator.authorLifjeld, Jan Terje
cristin.unitcode185,28,0,0
cristin.unitnameNaturhistorisk museum
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1
dc.identifier.cristin1712902
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Avian Biology&rft.volume=50&rft.spage=1&rft.date=2019
dc.identifier.jtitleJournal of Avian Biology
dc.identifier.volume50
dc.identifier.issue3
dc.identifier.doihttps://doi.org/10.1111/jav.02056
dc.identifier.urnURN:NBN:no-79709
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0908-8857
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/76603/1/jab%2B2019.pdf
dc.type.versionAcceptedVersion
cristin.articleidjav.02056
dc.relation.projectNFR/230434


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