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Do antidepressants impair colour change and camouflage in two juvenile marine invertebrates, Sepia officinalis and Carcinus maenas?

Abstract : Prescriptions of antidepressants are still on the rise worldwide, and their excretion may result in a potential contamination of the aquatic compartments. Indeed, antidepressant residues such as fluoxetine (Prozac©) and venlafaxine (Effexor©) are currently detected at low concentrations, from ng.L-1 to μg.L-1. Due to bioaccumulation, however, the toxicity of these micropollutants is not necessarily represented by their concentration in the water body. Furthermore, these compounds conceived to treat depressive or anxiety disorders are worrisome because they can trigger neurobiological changes through targeting the serotonergic system of non-target organisms, such as marine invertebrates. Indeed, juvenile shore crabs and cuttlefish, which are particularly vulnerable to predators, thrive in the intertidal zone and coastal water. These animals express cryptic patterns enabling them to hide from their predators by blending into their environment. The dynamic change of patterns and the intensity of colouration can be achieved very rapidly as in S. officinalis, or more slowly as in C. maenas, either being controlled nervously, or by neuropeptide hormones, respectively. Neuronal and neurohormonal control, in turn, is influenced by neurotransmitters, such as serotonin. To study the effects of antidepressants at environmental concentrations, juvenile cuttlefish and crabs were exposed during 30 days to fluoxetine alone or in mixture with venlafaxine (i.e. 2.5 ng.L-1 and 5 ng.L-1). The animals passed several behavioural tests such as predation; colour change on opposite backgrounds, on grey medium or checkerboard background; sand-digging behaviour, to evaluate their camouflage and colour change efficiency each week. Juvenile cuttlefish exposed to low concentration of antidepressants showed a decrease in predation motivation and success, and modified colour change and camouflage in certain conditions. In young crabs low concentration of antidepressants seemed to elicit cuticule brightening as rapid and transient colour change.
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Submitted on : Tuesday, January 14, 2020 - 10:04:49 AM
Last modification on : Friday, July 24, 2020 - 2:59:52 PM

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  • HAL Id : hal-02438136, version 1

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Apolline Chabenat, Cécile Bellanger, Thomas Knigge. Do antidepressants impair colour change and camouflage in two juvenile marine invertebrates, Sepia officinalis and Carcinus maenas?. 8th Young Environmental Scientists Meeting, Society of Environmental Toxicology and Chemistry; Ghent University, Feb 2019, Gand, Belgium. ⟨hal-02438136⟩

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