John Wiley & Sons, Ltd.

Selenium tissue burden compartmentalization in resident white sturgeon (Acipenser transmontanus) of the san francisco bay delta estuary

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High selenium (Se) loads into the San Francisco Bay‐Delta (SFBD) are bioaccumulated and biomagnified in food webs and can impair reproduction of resident oviparous animals such as white sturgeon. The objective of this study was to determine Se tissue burden in SFBD resident white sturgeon to assess Se bioaccumulation in different organs, including ovaries and liver where egg yolk precursor proteins are synthesized. We obtained 54 SFBD‐resident white sturgeon including 26 females and 28 males sub‐adults with immature gonads, 8 females with vitellogenic eggs, and 13 males with maturing gonads. Length, weight, age, reproductive stage of development, and kidney, liver, gonad and muscle Se concentrations were determined in all fish. Se concentrations in muscle, gonads and liver significantly increased with fish size, whereas kidney Se was not correlated to body size and was at highest level compared to other organs. There was no difference between sexes (p > 0.05) in Se concentrations in kidney (12.83 ± 0.51), liver (11.85 ± 1.04) and muscle (7.09 ± 0.52) (mean ± SE μg·g‐1 DW; n = 47), but Se concentration in the ovary was higher than in testis (p = 0.04). Females with vitellogenic eggs had higher Se concentrations in the ovaries (20.77 ± 4.11 vs. 5.22 ± 2.50), liver (21.84 ± 2.07 vs. 8.03 ± 1.03) and muscle (10.18 ± 1.93 vs. 5.48 ± 0.64), compared with less advanced, previtellogenic females (p<0.05). The elevated Se concentrations in the ovaries and liver of vitellogenic SFBD white sturgeon were comparable with levels previously shown to cause reproductive toxicity in dietary Se experiments with captive white sturgeon. Environ Toxicol Chem © 2014 SETAC

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