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首页> 外文期刊>Ecotoxicology and Environmental Safety >Effects of waterborne copper delivered under two different exposure and salinity regimes on osmotic and ionic regulation in the mudflat fiddler crab, Minuca rapax (Ocypodidae, Brachyura)
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Effects of waterborne copper delivered under two different exposure and salinity regimes on osmotic and ionic regulation in the mudflat fiddler crab, Minuca rapax (Ocypodidae, Brachyura)

机译：在两种不同暴露和盐度条件下输送的水性铜对泥滩提琴蟹Minuca rapax（Ocypodidae，Brachyura）渗透和离子调节的影响

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摘要

The effects of exposure to copper (Cu) on tissue Cu accumulation, on hemolymph osmotic, Na+ and regulation, and on gill Na+ /K+ -ATPase (NKA) and carbonic anhydrase (CA) activities were evaluated in the fiddler crab Minuca rapax. Waterborne copper was delivered to the crabs at one of three salinities (seawater at 25%0 salinity [S] = isosmotic control; distilled water [< 0.1%0 S] = hypo-osmotic medium; or 60%0 S = hyper-osmotic seawater) either for 5 days in a 0.5-cm water film containing 0, 50, 150, 250 or 500 mu g Cu/L with free access to a dry surface, or in crabs fully submerged for 5 h at 0, 250 or 500 mu g Cu/L. In the crabs with free access to a dry surface, the highest Cu concentrations were found in the hemolymph and hepatopancreas with some accumulation in the gills; accumulation in the hemolymph and gills was enhanced in low salinity but was salinity independent in the hepatopancreas. Osmotic regulation was unaffected by Cu exposure; however Na+ and hypo- regulation was impaired by Cu in 25 and 60%0 S. Gill NKA activity was stimulated 2-fold at 50 mu g Cu/L and markedly inhibited at 150 mu g Cu/L and above in 0 and 25%0 S. Gill CA was inhibited in < 0.1%0 S but stimulated in 25 and 60%0 S; an inverse concentration-CA activity response was seen above 150 mu g Cu/L for all salinities. In the submerged crabs, Cu accumulated in all tissues in 60%0 S; however, there was no clear-cut Cu concentration-accumulation relationship evident in any tissue for either exposure regime, likely owing to the crabs' ability to regulate Cu. Copper exposure diminished osmotic, [Na+] and [Cl- hypo-regulatory ability, especially in higher salinities. Gill NKA activity was markedly inhibited by Cu overall, and particularly above 250 mu g Cu/L in < 0.1%0 S. Gill CA activity was inhibited in 25%0 S but inconsistently affected in 0 and 60%0 S. These findings show that Minuca rapax is affected both physiologically and biochemically by Cu contamination, although to different degrees, depending on the delivery regime, salinity, copper concentration and target tissue.
机译：在提琴蟹Minuca rapax中评估了暴露于铜（Cu）对组织Cu积累，血淋巴渗透，Na +和调节以及g Na + / K + -ATPase（NKA）和碳酸酐酶（CA）活性的影响。水性铜以三种盐度之一被输送到螃蟹（海水中25％0盐度[S] =等渗对照；蒸馏水[<0.1％0 S] =低渗介质；或60％0 S =高渗性）海水）在含有0、50、150、250或500μgCu / L的0.5厘米水膜中自由流通干燥表面的时间为5天，或者在0、250或500淹没的螃蟹中浸泡5小时铜/升在自由接触干燥表面的螃蟹中，血淋巴和肝胰腺中的铜含量最高，the中也有一定的积累。低盐度增加了血淋巴和mph中的积累，而肝胰腺中的盐分独立于盐度。渗透调节不受铜暴露的影响；然而，在25和60％0 S中，铜会损害Na +和调节不足。在50μg Cu / L时，刺ill NKA活性被激发了2倍，在150μgCu / L及以上时，0和25％时显着抑制了ill NKA活性。 0S。Gill CA在<0.1％0 S时被抑制，而在25和60％0 S中被刺激；对于所有盐度，在高于150μgCu / L时都观察到了反向的浓度-CA活性响应。在淹没的螃蟹中，铜在所有组织中的累积含量为60％0 S；但是，在任何一种组织中，任何一种暴露方式都没有明显的铜浓度-累积关系，这可能是由于螃蟹调节铜的能力所致。铜暴露减少了渗透，[Na +]和[Cl-]的调节力降低，特别是在较高盐度下。 overall的NKA活性总体上受到Cu的显着抑制，尤其是在<0.1％0 S中Cu / L大于250μgCu / L。G CA的活性在25％0 S中受到抑制，但在0和60％0 S中却受到不一致的影响。这些发现表明认为Minuca rapax在生理和生化上都受到Cu污染的影响，尽管在不同程度上取决于输送方式，盐度，铜浓度和目标组织。

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