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Open AccessArticle

A “Population Dynamics” Perspective on the Delayed Life-History Effects of Environmental Contaminations: An Illustration with a Preliminary Study of Cadmium Transgenerational Effects over Three Generations in the Crustacean Gammarus

1
INRAE, UR RiverLy, Laboratoire d’écotoxicologie, F-69625 Villeurbanne, France
2
ENTPE, INRAE, CNRS UMR 5023 LEHNA, rue Maurice Audin, 69518 Vaulx-en-Velin CEDEX, France
3
CEA, LAN, 17 rue des Martyrs, 38054 Grenoble CEDEX 9, France
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(13), 4704; https://doi.org/10.3390/ijms21134704
Received: 29 May 2020 / Revised: 27 June 2020 / Accepted: 30 June 2020 / Published: 1 July 2020
(This article belongs to the Special Issue Advances in Metal Metabolism Research)
We explore the delayed consequences of parental exposure to environmentally relevant cadmium concentrations on the life-history traits throughout generations of the freshwater crustacean Gammarus fossarum. We report the preliminary results obtained during a challenging one-year laboratory experiment in this environmental species and propose the use of population modeling to interpret the changes in offspring life-history traits regarding their potential demographic impacts. The main outcome of this first long-term transgenerational assay is that the exposure of spawners during a single gametogenesis cycle (3 weeks) could result in severe cascading effects on the life-history traits along three unexposed offspring generations (one year). Indeed, we observed a decrease in F1 reproductive success, an early onset of F2 offspring puberty with reduced investment in egg yolk reserves, and finally a decrease in the growth rate of F3 juveniles. However, the analysis of these major transgenerational effects by means of a Lefkovitch matrix population model revealed only weak demographic impacts. Population compensatory processes mitigating the demographic consequences of parental exposure seem to drive the modification of life-history traits in offspring generations. This exploratory study sheds light on the role of population mechanisms involved in the demographic regulation of the delayed effects of environmental toxicity in wild populations. View Full-Text
Keywords: Crustaceans; Amphipoda; Gammarus; cadmium; transgenerational effects; parental exposure; population effects; life-history trait; demographic impacts; population dynamics modeling Crustaceans; Amphipoda; Gammarus; cadmium; transgenerational effects; parental exposure; population effects; life-history trait; demographic impacts; population dynamics modeling
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Cribiu, P.; Devaux, A.; Garnero, L.; Abbaci, K.; Bastide, T.; Delorme, N.; Quéau, H.; Degli Esposti, D.; Ravanat, J.-L.; Geffard, O.; Bony, S.; Chaumot, A. A “Population Dynamics” Perspective on the Delayed Life-History Effects of Environmental Contaminations: An Illustration with a Preliminary Study of Cadmium Transgenerational Effects over Three Generations in the Crustacean Gammarus. Int. J. Mol. Sci. 2020, 21, 4704.

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