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首页> 外文期刊>The Journal of Experimental Biology >Changing salinity induces alterations in hemolymph ion concentrations and Na+ and Cl- transport kinetics of the anal papillae in the larval mosquito, Aedes aegypti
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Changing salinity induces alterations in hemolymph ion concentrations and Na+ and Cl- transport kinetics of the anal papillae in the larval mosquito, Aedes aegypti

机译：盐度的变化会引起埃及伊蚊幼虫蚊子的乳头内淋巴离子浓度和Na +和Cl-迁移动力学的改变。

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摘要

Mosquito larvae are found in diverse aquatic habitats ranging from freshwater to hypersaline water and must often deal with rapid changes in habitat salinity. We transferred larvae of Aedes aegypti from freshwater to 30% seawater, or vice versa, and measured the time course of changes in their hemolymph ion concentrations, using ion-selective microelectrodes. We also reported the Michaelis-Menten kinetics of Na(+) and Cl(-) transport by the anal papillae for the first time using the scanning ion-selective electrode technique (SIET). Hemolymph concentrations of Na(+), Cl(-) and H(+) increased within 6 h, when larvae were transferred from freshwater to seawater and decreased within 6 h, when transferred from seawater to freshwater. Kinetic parameters for Na(+) and Cl(-) transport by the anal papillae were altered after only 5 h following transfer between freshwater (FW) and 30% seawater (30%SW). The J(max) (maximum transport rate) for both ions decreased when larvae were transferred to 30%SW, whereas the K(t) (a measure of transporter affinity) increased for Na(+) transport but was unaltered for Cl(-) transport, suggesting that Na(+) and Cl(-) uptake are independent. Data reveal significant changes in ion transport by the anal papillae of mosquito larvae when they are faced with changes in external salinity such that Na(+) and Cl(-) uptake decrease in higher salinity. The alterations in Na(+) and Cl(-) uptake may be a consequence of changes in hemolymph ion levels when larvae encounter altered salinity. The rapid changes in ion transport described here compliment the previously observed long term alterations in the morphology and ultrastructure of the anal papillae.
机译：蚊虫幼虫存在于从淡水到高盐度水的各种水生生境中，必须经常应对生境盐度的快速变化。我们将埃及伊蚊的幼体从淡水转移到30％的海水中，反之亦然，并使用离子选择微电极测量了它们的血淋巴离子浓度变化的时间过程。我们还首次报道了使用扫描离子选择电极技术（SIET）首次通过肛门乳头转运Na（+）和Cl（-）的Michaelis-Menten动力学。当幼虫从淡水转移到海水中时，Na（+），Cl（-）和H（+）的血淋巴浓度增加，而在从海水转移到淡水中的6小时内，血淋巴浓度降低。淡水（FW）和30％海水（30％SW）之间的转移仅5小时后，肛门乳头运输Na（+）和Cl（-）的动力学参数就改变了。当幼虫转移到30％SW时，两种离子的J（max）（最大传输速率）均降低，而Na（+）传输的K（t）（转运蛋白亲和力的一种度量）增加，而Cl（- ）转运，表明Na（+）和Cl（-）的吸收是独立的。数据显示，当蚊虫幼虫面对外部盐度变化时，其离子乳头的离子转运会发生显着变化，从而使较高盐度下的Na（+）和Cl（-）吸收降低。当幼虫遇到盐度变化时，Na（+）和Cl（-）吸收的变化可能是血淋巴离子水平变化的结果。这里描述的离子迁移的快速变化补充了以前观察到的肛门乳头形态和超微结构的长期变化。

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