{"refrec":{"BRefID":117771,"RR":"<b>Vidolin, D.; Santos-Gouvea, I.A.; Freire, C.A.</b> (2007). Differences in ion regulation in the sea urchins <i>Lytechinus variegatus</i> and <i>Arbacia lixula</i> (Echinodermata: Echinoidea). <i>J. Mar. Biol. Ass. U.K. 87(3)</i>: 769-775. <a href=\"https://dx.doi.org/10.1017/S0025315407054124\" target=\"_blank\">https://dx.doi.org/10.1017/S0025315407054124</a>","BEntID":112072,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Mar. Biol. Ass. U.K. 87(3)</i>: 769-775. <a href=\"https://dx.doi.org/10.1017/S0025315407054124\" target=\"_blank\">https://dx.doi.org/10.1017/S0025315407054124</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Vidolin, D.; Santos-Gouvea, I.A.; Freire, C.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Vidolin, D.; Santos-Gouvea, I.A.; Freire, C.A.","Englishabstract":"The regular sea urchin <i>Lytechinus variegatus</i>, a species previously reported from areas of reduced salinities, and <i>Arbacia lixula</i>, a species unreported from diluted waters, were submitted to seawater dilution or seawater dilution in magnesium-supplemented waters. Seawater (35 psu) was either proportionally diluted with filtered dechlorinated tap water (30 psu, 25 psu), or diluted and supplemented with magnesium as MgCl2 (30+Mg, 25+Mg), up to full-strength seawater Mg<sup>2+ </sup> levels (35 psu, ~54 mM Mg<sup>2+ </sup>). Magnesium supplementation was intended to verify the interfering effect of magnesium on osmo-ionic concentrations of the coelomic fluid (CF) of two ecologically distinct species of sea urchins. After 6 h in control (35 psu) or experimental seawater, CF samples were withdrawn by puncturing through the peristomial membrane. Coelomic fluid osmolality ([Osm]), and concentrations of ([Na<sup>+</sup>]), ([Cl<sup>-</sup>]), ([Mg<sup>2+ </sup>]) and ([K <sup>+</sup>]) were measured for both species. Under all conditions, <i>L. variegatus</i> displayed higher CF osmolality, [Na<sup>+</sup>], and [K<sup>+</sup>] values than the water (and <i>A. lixula</i>). Comparatively, <i>L. variegatus</i> is designated as a'hyper-conformer', while A. lixula is an 'iso-conformer'. The CF [Mg<sup>2+ </sup>] showed no evidence of being controlled by either species. Mg<sup>2+ </sup> supplementation in diluted seawater affected Mg<sup>2+</sup> and Cl<sup>-</sup> levels only. Na<sup>+</sup> appears to be taken up actively by <i>L. variegatus</i>, rendering its CF mostly hyper-ionic for Na<sup>+</sup> (and hyperosmotic) relative to external seawater. The different gradients observed with the different ions suggest selective permeabilities or ion regulation by <i>L. variegatus</i>.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Differences in ion regulation in the sea urchins <i>Lytechinus variegatus</i> and <i>Arbacia lixula</i> (Echinodermata: Echinoidea)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-13 01:31:10.743480","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2007,"MonPub":null,"DateUpdate":"2020-10-26","DateCreate":"2007-12-10","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000247354100019","VABBcode":null,"OpenAcc":0,"DOI":"10.1017/S0025315407054124"},"refs":null,"anarec":{"AnaID":117771,"PubliDate":2007,"Pagination":"769-775","XtraPublOfAnaID":null,"ISBN":null,"Volume":"87","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43277,"SerRR":"Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge.  ISSN 0025-3154; e-ISSN 1469-7769","StandardTitleSer":"Journal of the Marine Biological Association of the United Kingdom","ISSN":"0025-3154","AbbrevSer":"J. Mar. Biol. Ass. 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