Adaptation to reduced salinity affects the olfactory sensitivity of Senegalese sole (Solea senegalensis Kaup 1858) to Ca2+ and Na+ but not amino acids. | - CCMAR -

Journal Article

TitleAdaptation to reduced salinity affects the olfactory sensitivity of Senegalese sole (Solea senegalensis Kaup 1858) to Ca2+ and Na+ but not amino acids.
Publication TypeJournal Article
AuthorsVelez, Z, Hubbard, PC, Barata, EN, Canario, AVM
Year of Publication2009
JournalJ Exp Biol
Volume212
IssuePt 16
Date Published2009 Aug
Pagination2532-40
ISSN0022-0949
KeywordsAcclimatization, Amino Acids, Animals, Calcium, Electroencephalography, Environment, Flatfishes, Goldfish, Olfactory Bulb, Portugal, Salinity, Salmon, Smell, Sodium
Abstract

The Senegalese sole is a marine flatfish, which often penetrates into estuarine waters to feed. It cannot, however, survive in full freshwater. The current study investigated the effect of adaptation to low salinity (10 per thousand) on olfactory responses to changes in environmental [Ca(2+)] and [Na(+)] and amino acids by the electro-encephalogram (EEG) recorded from the olfactory bulb. The sole showed olfactory responses to increases in environmental [Na(+)] and decreases in environmental [Ca(2+)]; sensitivity to Na(+) was greater at 10 per thousand whereas sensitivity to Ca(2+) was greater at 35 per thousand. Decreased environmental [Na(+)] increased sensitivity to changes in [Ca(2+)] whereas increased environmental [Ca(2+)] decreased bulbar responses to changes in [Na(+)]. Sensitivity to amino acids was unaffected by external salinity. However, the absence of external Na(+) strongly decreased bulbar responses to amino acids in fish adapted to 35 per thousand seawater but not in those at 10 per thousand. The absence of external Ca(2+) had no such effect at either salinity. This suggests that odorant-receptor binding and/or olfactory transduction is reliant on external Na(+) (but not Ca(2+)) at higher salinities but the olfactory system is able to adapt to lower environmental [Na(+)]. Taken together, these results suggest that reductions of external salinity modulate olfactory sensitivity to environmental Ca(2+) and Na(+) but not amino acids. However, at low salinities, olfactory sensitivity to amino acids is maintained by decreasing reliance on external Na(+).

DOI10.1242/jeb.030775
Sapientia

http://www.ncbi.nlm.nih.gov/pubmed/19648397?dopt=Abstract

Alternate JournalJ. Exp. Biol.
PubMed ID19648397
CCMAR Authors