{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T15:45:18Z","timestamp":1776699918446,"version":"3.51.2"},"reference-count":51,"publisher":"Canadian Science Publishing","issue":"2","license":[{"start":{"date-parts":[[2012,2,1]],"date-time":"2012-02-01T00:00:00Z","timestamp":1328054400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can. J. Zool."],"published-print":{"date-parts":[[2012,2]]},"abstract":"<jats:p>Freshwater mussels are one of the most imperiled faunistic groups in the world and environmental exposure to toxic heavy metals, which result in deregulation of calcium absorption and deposition in the laboratory, may be a contributing factor in their decline. To address potential effects of heavy-metal exposure on calcium transport and metabolism in freshwater bivalves, adult Anodonta cygnea (L., 1758) were exposed to a sublethal concentration (1.0\u00a0\u00d7 10<jats:sup>\u22126<\/jats:sup>\u00a0mol\/L) of essential (Zn<jats:sup>2+<\/jats:sup>and Cu<jats:sup>2+<\/jats:sup>) or nonessential (Pb<jats:sup>2+<\/jats:sup>and Cr<jats:sup>3+<\/jats:sup>) metal for 30\u00a0days in the laboratory. Inorganic composition of extrapallial, haemolymph, heart, and pericardium fluids, and kidney tissue, as well as shell morphology by scanning electron microscopy, were compared in treated and untreated mussels. Calcium levels in fluids varied after exposure to any of the metals investigated, although the magnitude and threshold of effect were metal- and compartment-specific. Ca<jats:sup>2+<\/jats:sup>levels increased robustly in all fluids following exposure to Zn<jats:sup>2+<\/jats:sup>, Cu<jats:sup>2+<\/jats:sup>, or Cr<jats:sup>3+<\/jats:sup>, whereas levels decreased significantly in heart fluid alone following Pb<jats:sup>2+<\/jats:sup>exposure (p\u00a0&lt; 0.05). In constrast to exposure to the other metals, Cu<jats:sup>2+<\/jats:sup>revealed an interesting reverse-accumulation pattern, decreasing in the fluids but not in the kidney, where it clearly accumulates for excretion. In addition, whereas essential Cu<jats:sup>2+<\/jats:sup>and Zn<jats:sup>2+<\/jats:sup>are closely regulated, the nonessential metals Pb<jats:sup>2+<\/jats:sup>and Cr<jats:sup>3+<\/jats:sup>increase to very high levels. Drastic alterations in shell morphology, specifically the structure of border and inner pallial regions of the nacreous layer, were observed after Cu<jats:sup>2+<\/jats:sup>or Cr<jats:sup>3+<\/jats:sup>exposure. Collectively, data suggest that prolonged exposure to a sublethal concentration of these heavy metals can adversely affect compartmental calcium availability and shell composition in A.\u00a0cygnea.<\/jats:p>","DOI":"10.1139\/z11-129","type":"journal-article","created":{"date-parts":[[2012,2,3]],"date-time":"2012-02-03T09:46:04Z","timestamp":1328262364000},"page":"267-283","source":"Crossref","is-referenced-by-count":31,"title":["Ionic regulation and shell mineralization in the bivalve<i>Anodonta\u00a0cygnea<\/i>(swan mussel) following heavy-metal exposure"],"prefix":"10.1139","volume":"90","author":[{"given":"Manuel","family":"Lopes-Lima","sequence":"first","affiliation":[{"name":"Department of Aquatic Production, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Lg.\u00a0Abel Salazar\u00a02, 4099-003\u00a0Porto, Portugal."}]},{"given":"Susana","family":"Freitas","sequence":"additional","affiliation":[{"name":"Department of Aquatic Production, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Lg.\u00a0Abel Salazar\u00a02, 4099-003\u00a0Porto, Portugal."}]},{"given":"Liliana","family":"Pereira","sequence":"additional","affiliation":[{"name":"Department of Aquatic Production, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Lg.\u00a0Abel Salazar\u00a02, 4099-003\u00a0Porto, Portugal."}]},{"given":"Eugenia","family":"Gouveia","sequence":"additional","affiliation":[{"name":"Department of Aquatic Production, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Lg.\u00a0Abel Salazar\u00a02, 4099-003\u00a0Porto, Portugal."}]},{"given":"Mariana","family":"Hinzmann","sequence":"additional","affiliation":[{"name":"Department of Aquatic Production, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Lg.\u00a0Abel Salazar\u00a02, 4099-003\u00a0Porto, Portugal."}]},{"given":"Antonio","family":"Checa","sequence":"additional","affiliation":[{"name":"Department of Aquatic Production, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Lg.\u00a0Abel Salazar\u00a02, 4099-003\u00a0Porto, Portugal."}]},{"given":"Jorge","family":"Machado","sequence":"additional","affiliation":[{"name":"Department of Aquatic Production, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Lg.\u00a0Abel Salazar\u00a02, 4099-003\u00a0Porto, Portugal."}]}],"member":"155","reference":[{"key":"refg1\/ref1","first-page":"71","volume":"31","author":"Antunes C.","year":"2002","journal-title":"Haliotis"},{"key":"refg3\/ref3","doi-asserted-by":"publisher","DOI":"10.1002\/etc.5620150528"},{"key":"refg2\/ref2","doi-asserted-by":"publisher","DOI":"10.1023\/A:1005995217901"},{"key":"refg4\/ref4","doi-asserted-by":"publisher","DOI":"10.1016\/0048-9697(96)05166-2"},{"key":"refg7\/ref7","doi-asserted-by":"publisher","DOI":"10.1007\/BF00394024"},{"key":"refg9\/ref9","doi-asserted-by":"publisher","DOI":"10.1007\/s00300-003-0529-5"},{"key":"refg11\/ref11","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1242\/jeb.140.1.65","volume":"140","author":"Coimbra J.","year":"1988","journal-title":"J. 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