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Chemical Senses Advance Access originally published online on October 24, 2007
Chemical Senses 2008 33(2):119-123; doi:10.1093/chemse/bjm072
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Seasonal Variations in Olfactory Sensory Neurons—Fish Sensitivity to Sex Pheromones Explained?

El Hassan Hamdani1, Stine Lastein2, Finn Gregersen3 and Kjell B. Døving2

1 The Biotechnology Centre of Oslo, University of Oslo, PO Box 1125 Blindern, N-0317 Oslo, Norway 2 IMBV, University of Oslo, PO Box 1041, 0316 Oslo, Norway 3 Department of Biology, Centre for Ecological and Evolutionary Synthesis, University of Oslo, PO Box 1066 Blindern, N-0316 Oslo, Norway

Correspondence to be sent to: El Hassan Hamdani, IMBV, University of Oslo, PO Box 1041, 0316 Oslo, Norway. e-mail: elhh{at}biotek.uio.no


  Abstract

Olfactory sensory neurons of vertebrates regenerate throughout the life of the animal. In fishes, crypt cells are a type of olfactory sensory neurons thought to respond to sex pheromones. Here, we demonstrate that the number of crypt cells in the olfactory epithelium of the crucian carp varies dramatically throughout the year. During winter, few crypt cells are observed at any location within the sensory epithelium. In spring, the majority of crypt cells are located deep in the epithelium not yet exposed to the environment. However, during the summer spawning season, crypt cells are positioned at the epithelial surface. These findings may explain previous studies demonstrating a relationship between circulating androgen and olfactory sensitivity to sex pheromones.

Key words: crypt cells, olfaction, spawning, turnover

Accepted 19 September 2007


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