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Article: Temperature-dependent physiological responses of the dogwhelk Nucella lapillus to cadmium exposure

TitleTemperature-dependent physiological responses of the dogwhelk Nucella lapillus to cadmium exposure
Authors
Issue Date2000
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=MBI
Citation
Journal Of The Marine Biological Association Of The United Kingdom, 2000, v. 80 n. 4, p. 647-660 How to Cite?
AbstractThe combined effects of cadmium (Cd) and temperature on the physiology (oxygen consumption rate (MO2)) and biochemistry (glycogen, metallothionein (MT) and Cd concentrations) of fasted dogwhelks Nucella lapillus were investigated using two Cd concentrations (<0.01 or 500 μg l-1) and two water temperatures (5 or 10°C). After 20 days of exposure, the MO2 of dogwhelks of various sizes (12-32 mm in shell length) were measured individually. Dogwhelks exposed to Cd exhibited significantly lower MO2 at 10°C but not at 5°C when compared with controls at the same temperature. Inhibition of MO2 by Cd increased with increasing water temperature and decreasing animal size. Cadmium exposure caused significant reductions in glycogen concentrations in foot muscle and digestive gland at both temperatures. Cadmium-exposed dogwhelks showed significantly higher MT concentrations in the Leiblein gland at 10°C but not at 5°C, indicating that MT synthesis is temperature dependent and temperature is an important factor affecting toxicity of Cd in N. lapillus. Activity of dogwhelks and oxygen carrying capacity of the haemolymph, were significantly reduced as a result of Cd-exposure at 10°C. In addition, mucus secretion and necrotic cells were observed on the gill surface of Cd-exposed individuals. Therefore, reduction in MO2 may be directly linked to Cd-induced mucus production, structural damage to gills and reduction in oxygen carrying capacity of haemocyanin. However, metabolic depression, including low MO2 and activity, in Cd-exposed N. lapillus may be a strategy to: (i) minimize the uptake and toxicity of Cd; and (ii) minimize energy expenditure to spare energy reserves for detoxification (e.g. MT synthesis) and maintenance (e.g. repair of cellular damage). The results are discussed with reference to the use of MT and glycogen as biomarkers for metal exposure and toxicity in marine molluscs.
Persistent Identifierhttp://hdl.handle.net/10722/178695
ISSN
2015 Impact Factor: 1.094
2015 SCImago Journal Rankings: 0.509
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLeung, KMYen_US
dc.contributor.authorTaylor, ACen_US
dc.contributor.authorFurness, RWen_US
dc.date.accessioned2012-12-19T09:49:11Z-
dc.date.available2012-12-19T09:49:11Z-
dc.date.issued2000en_US
dc.identifier.citationJournal Of The Marine Biological Association Of The United Kingdom, 2000, v. 80 n. 4, p. 647-660en_US
dc.identifier.issn0025-3154en_US
dc.identifier.urihttp://hdl.handle.net/10722/178695-
dc.description.abstractThe combined effects of cadmium (Cd) and temperature on the physiology (oxygen consumption rate (MO2)) and biochemistry (glycogen, metallothionein (MT) and Cd concentrations) of fasted dogwhelks Nucella lapillus were investigated using two Cd concentrations (<0.01 or 500 μg l-1) and two water temperatures (5 or 10°C). After 20 days of exposure, the MO2 of dogwhelks of various sizes (12-32 mm in shell length) were measured individually. Dogwhelks exposed to Cd exhibited significantly lower MO2 at 10°C but not at 5°C when compared with controls at the same temperature. Inhibition of MO2 by Cd increased with increasing water temperature and decreasing animal size. Cadmium exposure caused significant reductions in glycogen concentrations in foot muscle and digestive gland at both temperatures. Cadmium-exposed dogwhelks showed significantly higher MT concentrations in the Leiblein gland at 10°C but not at 5°C, indicating that MT synthesis is temperature dependent and temperature is an important factor affecting toxicity of Cd in N. lapillus. Activity of dogwhelks and oxygen carrying capacity of the haemolymph, were significantly reduced as a result of Cd-exposure at 10°C. In addition, mucus secretion and necrotic cells were observed on the gill surface of Cd-exposed individuals. Therefore, reduction in MO2 may be directly linked to Cd-induced mucus production, structural damage to gills and reduction in oxygen carrying capacity of haemocyanin. However, metabolic depression, including low MO2 and activity, in Cd-exposed N. lapillus may be a strategy to: (i) minimize the uptake and toxicity of Cd; and (ii) minimize energy expenditure to spare energy reserves for detoxification (e.g. MT synthesis) and maintenance (e.g. repair of cellular damage). The results are discussed with reference to the use of MT and glycogen as biomarkers for metal exposure and toxicity in marine molluscs.en_US
dc.languageengen_US
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=MBIen_US
dc.relation.ispartofJournal of the Marine Biological Association of the United Kingdomen_US
dc.titleTemperature-dependent physiological responses of the dogwhelk Nucella lapillus to cadmium exposureen_US
dc.typeArticleen_US
dc.identifier.emailLeung, KMY: kmyleung@hku.hken_US
dc.identifier.authorityLeung, KMY=rp00733en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1017/S0025315400002472en_US
dc.identifier.scopuseid_2-s2.0-0033824155en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033824155&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume80en_US
dc.identifier.issue4en_US
dc.identifier.spage647en_US
dc.identifier.epage660en_US
dc.identifier.isiWOS:000089726900009-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLeung, KMY=7401860738en_US
dc.identifier.scopusauthoridTaylor, AC=7405892022en_US
dc.identifier.scopusauthoridFurness, RW=7103164978en_US

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