Water drop on feather. Photo: Frank Muzio.
🚨 Top-downloaded 2024/25: What do we really know about the water repellency of feathers? A systematic review about what has been done, what makes sense, and more importantly, what is missing.
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Three months into her role with DPIRD, @murdoch.edu.au PhD graduate Maria Pfeifle's research focus has switched from #waterrepellency to #potassium and nutrient management: soilswest.org.au/northam-call... #soilnews #soilresearch #soilscience #graingrowers
Fig. 1 from the article: Diagram of the set-up used to measure contact angles of water droplets on feathers. For details see article.
Fig. 2 from the article: (a) Correlation plots of structural indices (SI) and contact angles of Bicknell's and Swainson's thrush. Larger structural indices and contact angles indicate a more hydrophobic surface. (b) An image of a water droplet on the pennaceous vane of a Swainson's thrush feather, and c) Bicknell's thrush feather.
NEW PAPER: Discordancy of two common methods of measuring feather hydrophobicity. Feather water repellency is better assessed by contact angle than by structural index, and uropygial oil directly increases repellency.
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#ornithology #birds #feathers #waterrepellency
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