U. S. Geological Survey, Great Lakes Science Center, Ann Arbor, MI 48105, USA.
Sci Total Environ. 2010 Mar 1;408(7):1725-30. doi: 10.1016/j.scitotenv.2009.12.024. Epub 2010 Jan 13.
We determined polychlorinated biphenyl (PCB) concentrations in 61 female lake trout (Salvelinus namaycush) and 71 male lake trout from Lake Ontario (Ontario, Canada and New York, United States). To estimate the expected change in PCB concentration due to spawning, PCB concentrations in gonads and in somatic tissue of lake trout were also determined. In addition, bioenergetics modeling was applied to investigate whether gross growth efficiency (GGE) differed between the sexes. Results showed that, on average, males were 22% higher in PCB concentration than females in Lake Ontario. Results from the PCB determinations of the gonads and somatic tissues revealed that shedding of the gametes led to 3% and 14% increases in PCB concentration for males and females, respectively. Therefore, shedding of the gametes could not explain the higher PCB concentration in male lake trout. According to the bioenergetics modeling results, GGE of males was about 2% higher than adult female GGE, on average. Thus, bioenergetics modeling could not explain the higher PCB concentrations exhibited by the males. Nevertheless, a sexual difference in GGE remained a plausible explanation for the sexual difference in PCB concentrations of the lake trout.
我们测定了安大略湖（加拿大安大略省和美国纽约州）61 条雌湖鳟（Salvelinus namaycush）和 71 条雄湖鳟的多氯联苯（PCB）浓度。为了估计产卵导致的 PCB 浓度预期变化，我们还测定了湖鳟生殖腺和体组织中的 PCB 浓度。此外，还应用生物能量学模型来研究雌雄两性之间的总生长效率（GGE）是否存在差异。结果表明，安大略湖中雄性湖鳟的 PCB 浓度平均比雌性高 22%。生殖腺和体组织中 PCB 含量的测定结果表明，雄性和雌性的配子脱落分别导致 PCB 浓度增加 3%和 14%。因此，配子脱落不能解释雄性湖鳟中较高的 PCB 浓度。根据生物能量学模型的结果，雄性的 GGE 平均比成年雌性 GGE 高约 2%。因此，生物能量学模型也不能解释雄性湖鳟中较高的 PCB 浓度。尽管如此，GGE 的性别差异仍然是湖鳟 PCB 浓度存在性别差异的一个合理解释。
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