在这里,我们评估了两种寄生物种的痕量金属积累的潜力,赤霉酸。(线虫)和毛竹。(Digenea),发现了寄生HopliasMalabaricus,一种字符鱼,也被称为trahira,从两条新热带河流中采集,Jacaré-Pepira和Jacaré-Guaçú,在巴西东南部。鱼是在2017年7月至2019年7月之间收集的,共分析了90条鱼标本。45条河流从鱼,我们采集三种不同组织的样本:肌肉,肠和肝脏。连同取自鱼宿主的寄生虫样本,通过电感耦合等离子体质谱仪(ICP-MS)分析组织样品,以获得痕量金属(Al,Cr,Mn,Fe,Ni,Cu,As,CdePb)浓度。所有元素在寄生虫中都以统计学上较高的浓度被发现,线虫和二系,比在宿主组织中,但相比之下,观察到赤霉病。浓度高于在毛竹中获得的浓度。我们还发现,未感染的鱼类在统计上比被感染的鱼类具有更高的金属浓度。在那些被感染的人中,寄生基础种群的大小与宿主组织中获得的痕量金属的浓度呈负相关,也就是说,随着寄生种群的增加,鱼类的浓度呈下降趋势,反之亦然。此外,我们的结果表明,在单一感染或共感染的情况下,寄生虫种群对鱼类宿主中金属浓度的影响不受影响。
Here we evaluated the potential for trace metal accumulation of two parasitic species, Hysterothylacium sp. (Nematoda) and Phyllodistomum sp. (Digenea), found parasitizing Hoplias malabaricus, a characiform fish also known as trahira, collected from two neotropical rivers, Jacaré-Pepira and Jacaré-Guaçú, in southeastern Brazil. Fish were collected between July 2017 and July 2019, totaling 90 fish specimens analyzed, 45 from each river. From fish, we take samples of three different tissues: muscle, intestine and liver. Along with the parasite samples taken from fish hosts, tissue samples were analyzed by an Inductively Coupled Plasma Mass Spectrometer (ICP-MS) for obtaining the trace metal (Al, Cr, Mn, Fe, Ni, Cu, As, Cd e Pb) concentrations. All elements were found in statistically higher concentrations in the parasites, both nematodes and digeneans, than in the host tissues, but in comparison, was observed that Hysterothylacium sp. had higher concentrations than those obtained in Phyllodistomum sp. We also found that uninfected fish had statistically higher concentrations of metals than infected ones. And in those who are infected, the size of the parasitic infrapopulations correlated negatively with the concentrations of trace metals obtained in the hosts tissues, that is, the concentrations in fish showed a tendency to decrease as the parasitic infrapopulations increased, or vice versa. In addition, our results show that the influence of the parasitic infrapopulations on metal concentrations in the fish host is not affected in cases of mono-infection or co-infection.