Ion composition and osmolarity of Caspian Sea ctenophore, Mnemiopsis leidyi, in different salinities |
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Authors: | Maryam Yazdani Foshtomi Behrooz Abtahi Mehrshad Taheri |
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Affiliation: | a Faculty of Marine Sciences, Tarbiat Modarres University, Iranian National Center for Oceanography-Chabahar Oceanographic Research Station (CORS), Iran b Faculty of Marine Sciences, Tarbiat Modarres University, PO Box: 14115-356, Iran |
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Abstract: | The aim was to study osmotic and ionic regulation in alien ctenophore, Mnemiopsis leidyi (total length of 1.5-3 cm), acclimated gradually to artificial sea water of different salinities (8, 13, 18 and 23 ppt) in laboratory conditions (24 ± 2 °C) with the salt composition and proportion of the Caspian Sea. Results showed that this species is hyper-osmoconformer (maintaining internal osmolarity 2-22 mOsmol l− 1 above external) in non-lethal salinities ranging from 8 to 23 ppt. The results of ionic regulatory investigations revealed that this species can regulate Ca2+ and SO42− so that the concentration of Ca2+ in the internal fluid and SO42− in the external fluid were significantly more in 8 and 13 ppt, respectively. No regulation was observed about other ions such as Cl−, Mg2+ and K+ in the mentioned salinities. |
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Keywords: | Caspian Sea Ion composition Mnemiopsis leidyi Osmolarity Salinity |
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