期刊
ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY
卷 93, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.etap.2022.103889
关键词
Gammarus; Crangonyx; Stygobromus; Photobehavior; SSRI; Serotonin
This study documents the phototactic responses of different amphipod populations to fluoxetine exposure. The results show that all species exhibit significant photonegative responses, but short-term and long-term exposure to fluoxetine have different effects on photoneutrality. The effects vary among populations and sampling locations, highlighting the species-specific and geographically distinct responses to light.
We document phototactic responses in different amphipod populations of Gammarus minus, Stygobromus tenuis, and Crangonyx shoemakeri, each collected at 2-3 sites within the Washington DC area. We then assessed how baseline phototaxis was altered following either short-term (3-week) or long-term (6-week) exposure to 0.05 mu g/ L or 0.5 mu g/L fluoxetine. Our results classify all species as significantly photonegative, a response that depended solely on the presence, not quality, of light. Short-term fluoxetine exposure caused some animals to become photoneutral, regardless of concentration, while others remained photonegative. Long-term exposure to 0.5 mu g/L fluoxetine caused photoneutral behaviors in all surviving populations; exposure to 0.05 mu g/L had variable effects. These differential effects were due to a significant effect of population/sampling location on photobehavior. Overall, these results identify species-specific effects of chronic fluoxetine exposure and underscore how the response to light in 7 geographically distinct populations is uniquely tuned to requirements for survival.
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