Motion-driven flow in an unusual piscine nasal region

Mawuli P. K. Agbesi, Heather S. Borsuk, Jeremy N. Hunt, James S. Maclaine, Richard L. Abel, Dan Sykes, Andrew T. Ramsey, Zhijin Wang, Jonathan P. L. Cox

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Abstract

Fishes have several means of moving water to effect odorant transport to their olfactory epithelium (‘olfactory flow’). Here we show that olfactory flow in the adult garpike Belone belone (Belonidae, Teleostei), a fish with an unusual nasal region, can be generated by its motion relative to water (swimming, or an external current, or both). We also show how the unusual features of the garpike’s nasal region influence olfactory flow. These features comprise a triangular nasal cavity in which the olfactory epithelium is exposed to the external environment, a papilla situated within the nasal cavity, and an elongated ventral apex. To perform our investigation we first generated life-like plastic models of garpike heads from X-ray scans of preserved specimens. We then suspended these models in a flume and flowed water over them to simulate swimming. By directing filaments of dye at the static models, we were able to visualise flow in the nasal regions at physiologically relevant Reynolds numbers (700–2,000). We found that flow of water over the heads did cause circulation in the nasal cavity. Vortices may assist in this circulation. The pattern of olfactory flow was influenced by morphological variations and the asymmetry of the nasal region. The unusual features of the nasal region may improve odorant sampling in the garpike, by dispersing flow over the olfactory epithelium and by creating favourable conditions for odorant transport (e.g. steep velocity gradients). Unexpectedly, we found that the mouth and the base of the garpike’s jaws may assist the sampling process. Thus, despite its apparent simplicity, the garpike’s nasal region is likely to act as an effective trap for odorant molecules.
Original languageEnglish
JournalZoology
Early online date6 Jul 2016
DOIs
Publication statusPublished - 1 Dec 2016

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odor compounds
nasal cavity
epithelium
Belonidae
water
fish
jaws
water flow
dyes
mouth
X-radiation
plastics
traps
sampling

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Agbesi, M. P. K., Borsuk, H. S., Hunt, J. N., Maclaine, J. S., Abel, R. L., Sykes, D., ... Cox, J. P. L. (2016). Motion-driven flow in an unusual piscine nasal region. Zoology. https://doi.org/10.1016/j.zool.2016.06.008

Motion-driven flow in an unusual piscine nasal region. / Agbesi, Mawuli P. K.; Borsuk, Heather S.; Hunt, Jeremy N.; Maclaine, James S.; Abel, Richard L.; Sykes, Dan; Ramsey, Andrew T.; Wang, Zhijin; Cox, Jonathan P. L.

In: Zoology, 01.12.2016.

Research output: Contribution to journalArticle

Agbesi, MPK, Borsuk, HS, Hunt, JN, Maclaine, JS, Abel, RL, Sykes, D, Ramsey, AT, Wang, Z & Cox, JPL 2016, 'Motion-driven flow in an unusual piscine nasal region', Zoology. https://doi.org/10.1016/j.zool.2016.06.008
Agbesi MPK, Borsuk HS, Hunt JN, Maclaine JS, Abel RL, Sykes D et al. Motion-driven flow in an unusual piscine nasal region. Zoology. 2016 Dec 1. https://doi.org/10.1016/j.zool.2016.06.008
Agbesi, Mawuli P. K. ; Borsuk, Heather S. ; Hunt, Jeremy N. ; Maclaine, James S. ; Abel, Richard L. ; Sykes, Dan ; Ramsey, Andrew T. ; Wang, Zhijin ; Cox, Jonathan P. L. / Motion-driven flow in an unusual piscine nasal region. In: Zoology. 2016.
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