Abstract
Mercury concentration [Hg] was assessed in 20 adult Allis shad Alosa alosa (54–59 cm) and 20 adult Twaite shad Alosa fallax (36–44 cm) collected during their spawning migration in the Dordogne and the Garonne rivers (France). [Hg] was measured in the gills, dorsal muscle, liver and kidney. Twaite shad exhibited higher [Hg] than Allis shad. Median [Hg] values were [Hg]Gills=0.33 μg g−1 (dw), [Hg]Muscle=1.22 μg g−1, [Hg]Liver=1.99 μ g−1, [Hg]Kidney=1.93 μg g−1 for Twaite shad and [Hg]Gills=0.06 μg g−1, [Hg]Muscle=0.20 μg g−1, [Hg]Liver=1.18 μg g−1, [Hg]Kidney=1.08 μg g−1 for Allis shad. In order to understand such differences, we investigated some life history traits of the two species: migratory history, age (3–6 years), size at age (an expression of growth) and the number of spawning events (0–2 events). The difference in estuarine residence time between the juveniles of both species, which was assumed to influence [Hg], was investigated using otolith Sr:Ca ratio. The microchemical analysis revealed a significant difference in the residence time of juveniles in the estuary (medians are 21 d and 10 d for Twaite shad and Allis shad, respectively) but this residence time seems too short to influence [Hg] (Allis shad: r spearman<0.128; Twaite shad: r spearman<−0.340). As both species show the same age structure, the influence of age on [Hg] was negligible. The literature shows that the differences in growth and in the number of spawning events reported in our study are in favour of a higher [Hg] for Twaite shad than for Allis shad. Although trophic status was not investigated here, the literature reveals that it is another factor that could produce higher [Hg] in Twaite shad, since its diet includes higher trophic levels than Allis shad.
Guest editors: S. Dufour, E. Prévost, E. Rochard & P. Williot Fish and diadromy in Europe (ecology, management, conservation)
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Lochet, A. et al. (2008). Mercury contamination and life history traits of Allis shad Alosa alosa (Linnaeus, 1758) and Twaite shad Alosa fallax (Lacépède, 1803) in the gironde estuary (South West France). In: Dufour, S., Prévost, E., Rochard, E., Williot, P. (eds) Fish and Diadromy in Europe (ecology, management, conservation). Developments in Hydrobiology, vol 200. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8548-2_8
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