Tigert Liam R, Hubbard Peter C, Porteus Cosima S
Department of Biological Sciences, University of Toronto Scarborough, Toronto, ON M1C 1A4, Canada.
Cells and Systems Biology, University of Toronto, ON M5S 1A1, Canada.
J Exp Biol. 2025 Jan 1;228(1). doi: 10.1242/jeb.249771. Epub 2025 Jan 9.
Coastal environments around the world are becoming increasingly hypoxic owing to anthropogenic effects. We hypothesized that, because the olfactory epithelium is in contact with the external environment, decreased external oxygen will impair olfaction. We performed electro-olfactograms on juvenile gilt-head seabream (Sparus aurata) and measured the response to three amino acids at five different concentrations (1×10-7 to 1×10-3 mol l-1) in normoxic (20 kPa O2) and two hypoxic conditions (12.5 and 5.7 kPa O2). For the first time, we show that both mild and moderate hypoxia decreased the olfactory response to two out of three odorants. As more coastal areas become hypoxic, it is important to understand how hypoxia may impair the sensory systems of fishes, which can have individual- and population-level effects and important implications for our food supply.
由于人为影响，世界各地的沿海环境正变得越来越缺氧。我们推测，由于嗅觉上皮与外部环境接触，外部氧气减少会损害嗅觉。我们对幼年金头鲷（Sparus aurata）进行了嗅觉电图实验，并测量了在常氧（20 kPa O2）和两种低氧条件（12.5和5.7 kPa O2）下，对三种不同浓度（1×10-7至1×10-3 mol l-1）的三种氨基酸的反应。我们首次表明，轻度和中度缺氧都会降低对三种气味物质中两种的嗅觉反应。随着更多沿海地区变得缺氧，了解缺氧如何损害鱼类的感觉系统非常重要，这可能会对个体和种群水平产生影响，并对我们的食物供应产生重要影响。
