Ion secretion by salt glands of desert iguanas (Dipsosaurus dorsalis)

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

Unlike the NaCl-secreting salt glands of many birds and reptiles, the nasal salt glands of lizards can secrete potassium as well as sodium, with either chloride or bicarbonate as the accompanying anion. The factors responsible for initiating secretion by the gland and the rates of cation and anion secretion were studied in the desert iguana, Dipsosaurus dorsalis. Lizards were given combinations of ions for several days, and secreted salt was collected daily and analyzed for sodium, potassium, chloride, and bicarbonate. Maximum total cation secretion rate was 4.4 ± 0.38 μmol/g/d. Cation secretion ranged from 24% to 100% potassium; even high NaCl loads did not abolish potassium secretion. Maximum bicarbonate secretion was about 0.5 μmol/g/d; chloride was the predominant anion. Secretion rate increased only in response to those treatments that included potassium and/or chloride; sodium ions and other osmotic loads (e.g., sucrose) did not increase secretion. This is in contrast to birds and some other reptiles with salt glands, which initiate NaCl secretion in response to any osmotic load. The specificity of the response of the salt gland of Dipsosaurus may be related to the ecological importance of dietary potassium and chloride for herbivorous desert lizards.

Original languageEnglish
Pages (from-to)22-31
Number of pages10
JournalPhysiological and Biochemical Zoology
Volume74
Issue number1
DOIs
StatePublished - 17 Apr 2001

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Iguanas
Salt Gland
Lizards
Potassium Chloride
Salts
secretion
Ions
ions
salts
Anions
Potassium
Cations
Reptiles
Chlorides
Bicarbonates
Sodium
Birds
potassium
Dietary Potassium
chlorides

Cite this

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title = "Ion secretion by salt glands of desert iguanas (Dipsosaurus dorsalis)",
abstract = "Unlike the NaCl-secreting salt glands of many birds and reptiles, the nasal salt glands of lizards can secrete potassium as well as sodium, with either chloride or bicarbonate as the accompanying anion. The factors responsible for initiating secretion by the gland and the rates of cation and anion secretion were studied in the desert iguana, Dipsosaurus dorsalis. Lizards were given combinations of ions for several days, and secreted salt was collected daily and analyzed for sodium, potassium, chloride, and bicarbonate. Maximum total cation secretion rate was 4.4 ± 0.38 μmol/g/d. Cation secretion ranged from 24{\%} to 100{\%} potassium; even high NaCl loads did not abolish potassium secretion. Maximum bicarbonate secretion was about 0.5 μmol/g/d; chloride was the predominant anion. Secretion rate increased only in response to those treatments that included potassium and/or chloride; sodium ions and other osmotic loads (e.g., sucrose) did not increase secretion. This is in contrast to birds and some other reptiles with salt glands, which initiate NaCl secretion in response to any osmotic load. The specificity of the response of the salt gland of Dipsosaurus may be related to the ecological importance of dietary potassium and chloride for herbivorous desert lizards.",
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language = "English",
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pages = "22--31",
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Ion secretion by salt glands of desert iguanas (Dipsosaurus dorsalis). / Hazard, Lisa.

In: Physiological and Biochemical Zoology, Vol. 74, No. 1, 17.04.2001, p. 22-31.

Research output: Contribution to journalArticleResearchpeer-review

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