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Article: Cardiac responses to abiotic factors in two tropical limpets, occurring at different levels of the shore

TitleCardiac responses to abiotic factors in two tropical limpets, occurring at different levels of the shore
Authors
Issue Date2001
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00227/index.htm
Citation
Marine Biology, 2001, v. 139 n. 6, p. 1079-1085 How to Cite?
AbstractLaboratory experiments tested whether the cardiac activity of two species of limpets (Cellana spp.), co-occurring on the rocky shores of Hong Kong but having different zonal distributions, was differently affected by variations in physical environmental characteristics. Experiments reproduced exposure of limpets to dehydration, high water temperature and reduced salinity, all conditions that can occasionally be faced by animals during low tides. Cardiographic traces were obtained using a non-invasive method based on infrared light sensors glued onto the limpet shell in a position directly over the heart. The signals were filtered and amplified, viewed on portable oscilloscopes and automatically transferred to computer. When tested under acclimation temperatures, the lower shore C. toreuma had faster heart rates than the upper shore C. grata, both in air and when submerged in seawater. Regular alternation of heartbeating and acardia were observed in C. grata exposed to both dry and saturated air, whilst C. toreuma showed transient acardia only during exposure to dry air. Both species showed a similar increase in heart rate with increasing temperature (Q10∼1.8 in the range 25-34°C). When submerged in freshwater, C. grata regularly alternated acardia with beating at a rate slightly lower than in seawater, whilst C. toreuma showed strong bradycardia with reduction of beat amplitude, followed by steady acardia. Recovery of heart-beating after return to initial salinity was faster in C. grata, whilst C. toreuma, initially bradycardic, showed a consistent return to tachycardia. Overall, this study shows that the two congeneric species exhibit different cardiac responses to variations in environmental characteristics, which may be related to their differing vertical distribution.
Persistent Identifierhttp://hdl.handle.net/10722/73457
ISSN
2015 Impact Factor: 2.375
2015 SCImago Journal Rankings: 1.302
References

 

DC FieldValueLanguage
dc.contributor.authorChelazzi, Gen_HK
dc.contributor.authorDe Pirro, Men_HK
dc.contributor.authorWilliams, Gen_HK
dc.date.accessioned2010-09-06T06:51:26Z-
dc.date.available2010-09-06T06:51:26Z-
dc.date.issued2001en_HK
dc.identifier.citationMarine Biology, 2001, v. 139 n. 6, p. 1079-1085en_HK
dc.identifier.issn0025-3162en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73457-
dc.description.abstractLaboratory experiments tested whether the cardiac activity of two species of limpets (Cellana spp.), co-occurring on the rocky shores of Hong Kong but having different zonal distributions, was differently affected by variations in physical environmental characteristics. Experiments reproduced exposure of limpets to dehydration, high water temperature and reduced salinity, all conditions that can occasionally be faced by animals during low tides. Cardiographic traces were obtained using a non-invasive method based on infrared light sensors glued onto the limpet shell in a position directly over the heart. The signals were filtered and amplified, viewed on portable oscilloscopes and automatically transferred to computer. When tested under acclimation temperatures, the lower shore C. toreuma had faster heart rates than the upper shore C. grata, both in air and when submerged in seawater. Regular alternation of heartbeating and acardia were observed in C. grata exposed to both dry and saturated air, whilst C. toreuma showed transient acardia only during exposure to dry air. Both species showed a similar increase in heart rate with increasing temperature (Q10∼1.8 in the range 25-34°C). When submerged in freshwater, C. grata regularly alternated acardia with beating at a rate slightly lower than in seawater, whilst C. toreuma showed strong bradycardia with reduction of beat amplitude, followed by steady acardia. Recovery of heart-beating after return to initial salinity was faster in C. grata, whilst C. toreuma, initially bradycardic, showed a consistent return to tachycardia. Overall, this study shows that the two congeneric species exhibit different cardiac responses to variations in environmental characteristics, which may be related to their differing vertical distribution.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00227/index.htmen_HK
dc.relation.ispartofMarine Biologyen_HK
dc.titleCardiac responses to abiotic factors in two tropical limpets, occurring at different levels of the shoreen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0025-3162&volume=139&spage=1079&epage=1085&date=2001&atitle=Cardiac+responses+to+abiotic+factors+in+two+tropical+limpets,+occurring+at+different+levels+of+the+shoreen_HK
dc.identifier.emailWilliams, G: hrsbwga@hkucc.hku.hken_HK
dc.identifier.authorityWilliams, G=rp00804en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s002270100603en_HK
dc.identifier.scopuseid_2-s2.0-0035681771en_HK
dc.identifier.hkuros65617en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035681771&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume139en_HK
dc.identifier.issue6en_HK
dc.identifier.spage1079en_HK
dc.identifier.epage1085en_HK
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridChelazzi, G=7004590102en_HK
dc.identifier.scopusauthoridDe Pirro, M=6602987656en_HK
dc.identifier.scopusauthoridWilliams, G=7406082821en_HK

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