Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 477555
Title Chemical communication in tilapia: A comparison of Oreochromis mossambicus with O. niloticus
Author(s) Hubbard, P.C.; Mota, V.C.; Keller-Costa, T.; Paulo da Silva, J.; Canário, A.V.M.
Source General and Comparative Endocrinology 207 (2014). - ISSN 0016-6480 - p. 13 - 20.
DOI https://doi.org/10.1016/j.ygcen.2014.06.022
Department(s) Aquaculture and Fisheries
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2014
Keyword(s) maturation-inducing hormone - african cichlid fish - mozambique tilapia - olfactory sensitivity - speciation - pheromone - signals - urine - radiations - evolution
Abstract In allopatric speciation species differentiation generally results from different selective pressures in different environments, and identifying the traits responsible helps to understand the isolation mechanism(s) involved. Male Mozambique tilapia (Oreochromis mossambicus) use urine to signal dominance; furthermore, 5b-pregnane-3a,17,20b-triol-3a-glucuronide (and its a-epimer, 5b-pregnane-3a,17,20atriol-3a-glucuronide), in their urine is a potent pheromone, the concentration of which is correlated with social status. The Nile tilapia (Oreochromis niloticus) is a close relative; species divergence probably resulted from geographical separation around 6 million years ago. This raises the question of whether the two species use similar urinary chemical cues during reproduction. The olfactory potency of urine, and crude extracts, from either species was assessed by the electro-olfactogram and the presence of the steroid glucuronides in urine from the Nile tilapia by liquid-chromatography/mass-spectrometry. Both species showed similar olfactory sensitivity to urine and respective extracts from either species, and similar sensitivity to the steroid glucuronides. 5b-Pregnan-3a,17a,20b-triol-3a-glucuronide was present at high concentrations (approaching 0.5 mM) in urine from Nile tilapia, with 5b-pregnan-3a,17a,20a-triol-3a-glucuronide present at lower concentrations, similar to the Mozambique tilapia. Both species also had similar olfactory sensitivity to estradiol-3-glucuronide, a putative urinary cue from females. Together, these results support the idea that reproductive chemical cues have not been subjected to differing selective pressure. Whether these chemical cues have the same physiological and behavioural roles in O. niloticus as O. mossambicus remains to be investigated.
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