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首页> 外文期刊>Zoologia (Curitiba) >Osmolality and ions of the perivisceral coelomic fluid of the intertidal sea urchin Echinometra lucunter (Echinodermata: Echinoidea) upon salinity and ionic challenges
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Osmolality and ions of the perivisceral coelomic fluid of the intertidal sea urchin Echinometra lucunter (Echinodermata: Echinoidea) upon salinity and ionic challenges

机译：盐度和离子挑战时潮间带海胆棘皮动物棘皮动物腔内腔腔流体的渗透压和离子

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The intertidal sea-urchin Echinometra lucunter (Linnaeus, 1758) has been submitted to diluted sea water (SW) of salinity 25, or concentrated sea water of salinity 45. In addition, ionic challenges have been offered, supplementing 25 SW with Mg2+, Ca2+ or K+, until the concentration of each of these ions would reach the level of full-strength 35 SW (control). Perivisceral coelomic fluid has been sampled after six hours in these treatments for measurements of osmolality and concentrations of Na+, Cl-, Mg2+, Ca2+, and K+. Urchins have been further observed until five days. SW concentration (45) lead urchins to death after two days of exposure, while urchins tolerated five days in 25 SW without any sign of distress. Urchins displayed osmoconformation and ion-conformation for NaCl, and occasional small gradients with respect to the water for Mg2+ (~6% in full-strength SW), and K+ (8.5% in 25 SW), after six hours. These results are consistent with data compiled from the literature, for echinoderms, which frequently show positive gradients (often higher than 25%) for the most relevant ions, between the coelomic fluid and external SW. Supplemented cations have shown mutual interference, mostly affecting their own coelomic fluid concentrations. Under the protocol used here, urchins of the species E. lucunter held gradients for Mg2+, Ca2+, and K+, but not for Na+ or Cl- or osmolality. They were also able to tolerate at least a 30% reduction in sea water salinity for five days, showing reasonable euryhalinity. However, when compared to other echinoderms, E. lucunter is not especially capable of maintaining large ionic gradients with respect to external SW.
机译：潮间带海胆Echinometra lucunter（Linnaeus，1758）已被提交给盐度为25的稀释海水（SW）或盐度为45的浓缩海水。此外，还提供了离子挑战，用Mg2 +，Ca2 +补充25 SW。或K +，直到这些离子的浓度达到全强度35 SW（对照）的水平。在这些处理中六个小时后，取样了内脏腔腔积液，以测量渗透压和Na +，Cl-，Mg2 +，Ca2 +和K +的浓度。进一步观察了顽童直到五天。 SW浓度（45）在暴露两天后导致海胆死亡，而在25 SW中，海胆可以忍受五天而没有任何不适的迹象。六小时后，Urchins对NaCl表现出渗透构象和离子构象，并且偶尔出现相对于水而言的Mg2 +（全强度SW约为6％）和K +（25 SW约为8.5％）的小梯度。这些结果与从文献中得到的棘皮动物的数据相一致，棘皮动物在体液和外部SW之间经常显示出最相关离子的正梯度（通常高于25％）。补充的阳离子已显示出相互干扰，主要影响其自身的腔内流体浓度。根据此处使用的协议，E。lucunter物种的顽童对Mg2 +，Ca2 +和K +具有梯度，但对于Na +或Cl-或重量摩尔渗透压浓度没有梯度。他们还能够忍受至少5天的海水盐度降低30％，显示出合理的欧洲盐度。但是，与其他棘皮类动物相比，lucunter并不是特别能够相对于外部SW维持较大的离子梯度。

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