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This study examined the role of the anal papillae of the freshwater (FW) chironomid larva, Chironomus riparius, in ionoregulation under ion-poor conditions. The Scanning Ion-selective Electrode Technique (SIET) was utilized to characterize the species, direction and rates of inorganic ion transport by the anal papillae following acute and long-term exposure to ion-poor water (IPW). The major inorganic ions in the hemolymph of larvae treated as above were measured using standard ion-selective microelectrodes. The anal papillae of C. riparius are sites of net NaCl uptake and H+ secretion under FW and IPW conditions and are not likely to be a major contributor of K(+) exchange. Acute and long-term exposure to IPW increased total net transport of Na(+), Cl(-) and H(+) by the anal papillae but, the mechanisms underlying the increase under the two conditions were different. Acute IPW exposure increased the magnitude of net ion fluxes at sites along the anal papillae while long-term IPW exposure resulted in increased size of the anal papillae with no change in the magnitude of net ion fluxes. The contribution of the anal papillae to observed alterations of hemolymph ion activities upon exposure to IPW is discussed. Inhibitors of the Na(+)/H(+) exchangers (EIPA) and carbonic anhydrase (methazolamide) provide evidence for Na(+)/H(+) and Cl(-)/HCO(3)(-) exchange mechanisms in the anal papillae. This study demonstrates that Chironomus riparius larvae employ two different mechanisms to upregulate the total net transport of ions by the anal papillae and these mechanisms are at least partially responsible for regulating hemolymph ion activity.
This article was published in the following journal.
Name: American journal of physiology. Regulatory, integrative and comparative physiology
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Infestation with nematode worms of the genus TRICHOSTRONGYLUS. Man and animals become infected by swallowing larvae, usually with contaminated food or drink, although the larvae may penetrate human skin.
A family of nonbiting midges, in the order DIPTERA. Salivary glands of the genus Chironomus are used in studies of cellular genetics and biochemistry.
A species of parasitic nematode found in the intestine of dogs. Lesions in the brain, liver, eye, kidney, and lung are caused by migrating larvae. In humans, these larvae do not follow normal patterns and may produce visceral larva migrans (LARVA MIGRANS, VISCERAL).
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A state of intersex or sexual ambiguity, involving the GENOTYPE, the GONADS, the reproductive tract, and/or the external GENITALIA or PHENOTYPE. This concept covers TRUE HERMAPHRODITISM and PSEUDOHERMAPHRODITISM. True hermaphrodites are rare and they possess gonadal tissues of both sexes, tissues from the OVARY and the TESTIS. Pseudohermaphrodites possess gonadal tissue of one sex but exhibit external phenotype of the opposite sex.