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Article: The effects of emersion on ammonia efflux of three Hong Kong Nodilittorina species

TitleThe effects of emersion on ammonia efflux of three Hong Kong Nodilittorina species
Authors
KeywordsAmmonia
Effluxes
Emersion
Nodilittorina spp.
Tropical rocky shore
Issue Date2001
PublisherNational Shellfisheries Association, Inc. The Journal's web site is located at http://www.shellfish.org/pubs/jsr.htm
Citation
Journal Of Shellfish Research, 2001, v. 20 n. 1, p. 489-493 How to Cite?
AbstractOn moderately-exposed Hong Kong shores, the nodilittorinids, Nodilittorina trochoides and N. radiata occur in the high-splash zone and N. vidua slightly below this level, extending into the eulittoral. These species experience long emersion times and high rock and air temperatures. After exposure on the natural rock for 0 min (awash and active, control animals) or 1, 4 or 22 h emersed, groups of animals (n = 6) were re-immersed and their ammonia effluxes (weight-normalized for fresh tissue mass) measured after 0.5, 1.0 and 2.0 h. Re-immersed groups had initial (30 min) effluxes of 3.91, 6.01 and 3.53 μmoles NH 4 × g -1 × h -1 for N. trochoides, N. radiata and N. vidua respectively, which were high compared with the final values of 1.66, 2.02 and 0.32 μmoles NH 4 × g -1 × h -1 for the same species after 2 h of re-immersion. There were clear inter-specific efflux differences and the handling procedure evoked enhanced ammonia excretion rates possibly as a stress response. Re-immersed animals had lower effluxes than control groups and, generally, such rates were negatively related to the duration of the preceding emersion period. Effluxes of N. vidua, measured 30 rain after re-immersion were always higher than those measured at 1 or 2 h but this occurred with the other species only after they had been emersed for 1 h. Rates at all three sampling times following 4 or 22 h of emersion were very similar. The more eulittoral N. vidua may continue to produce ammonia during emersion periods of >1 h but the high-shore species do not. The energetic cost implications of this difference in post-emersion effluxes may be that emersion tolerance, hence vertical height on the shore, is limited for N. vidua. No evidence of a switch from ammonotely to uricotely was found for any species, but the production of non-excreted uric acid is not precluded.
Persistent Identifierhttp://hdl.handle.net/10722/73184
ISSN
2015 Impact Factor: 0.829
2015 SCImago Journal Rankings: 0.496
References

 

DC FieldValueLanguage
dc.contributor.authorUglow, RFen_HK
dc.contributor.authorWilliams, GAen_HK
dc.date.accessioned2010-09-06T06:48:56Z-
dc.date.available2010-09-06T06:48:56Z-
dc.date.issued2001en_HK
dc.identifier.citationJournal Of Shellfish Research, 2001, v. 20 n. 1, p. 489-493en_HK
dc.identifier.issn0730-8000en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73184-
dc.description.abstractOn moderately-exposed Hong Kong shores, the nodilittorinids, Nodilittorina trochoides and N. radiata occur in the high-splash zone and N. vidua slightly below this level, extending into the eulittoral. These species experience long emersion times and high rock and air temperatures. After exposure on the natural rock for 0 min (awash and active, control animals) or 1, 4 or 22 h emersed, groups of animals (n = 6) were re-immersed and their ammonia effluxes (weight-normalized for fresh tissue mass) measured after 0.5, 1.0 and 2.0 h. Re-immersed groups had initial (30 min) effluxes of 3.91, 6.01 and 3.53 μmoles NH 4 × g -1 × h -1 for N. trochoides, N. radiata and N. vidua respectively, which were high compared with the final values of 1.66, 2.02 and 0.32 μmoles NH 4 × g -1 × h -1 for the same species after 2 h of re-immersion. There were clear inter-specific efflux differences and the handling procedure evoked enhanced ammonia excretion rates possibly as a stress response. Re-immersed animals had lower effluxes than control groups and, generally, such rates were negatively related to the duration of the preceding emersion period. Effluxes of N. vidua, measured 30 rain after re-immersion were always higher than those measured at 1 or 2 h but this occurred with the other species only after they had been emersed for 1 h. Rates at all three sampling times following 4 or 22 h of emersion were very similar. The more eulittoral N. vidua may continue to produce ammonia during emersion periods of >1 h but the high-shore species do not. The energetic cost implications of this difference in post-emersion effluxes may be that emersion tolerance, hence vertical height on the shore, is limited for N. vidua. No evidence of a switch from ammonotely to uricotely was found for any species, but the production of non-excreted uric acid is not precluded.en_HK
dc.languageengen_HK
dc.publisherNational Shellfisheries Association, Inc. The Journal's web site is located at http://www.shellfish.org/pubs/jsr.htmen_HK
dc.relation.ispartofJournal of Shellfish Researchen_HK
dc.subjectAmmoniaen_HK
dc.subjectEffluxesen_HK
dc.subjectEmersionen_HK
dc.subjectNodilittorina spp.en_HK
dc.subjectTropical rocky shoreen_HK
dc.titleThe effects of emersion on ammonia efflux of three Hong Kong Nodilittorina speciesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0730-8000&volume=20&spage=489&epage=493&date=2001&atitle=The+effects+of+emersion+on+ammonia+efflux+of+three+Hong+Kong+Nodilittorina+speciesen_HK
dc.identifier.emailWilliams, GA: hrsbwga@hkucc.hku.hken_HK
dc.identifier.authorityWilliams, GA=rp00804en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0034852928en_HK
dc.identifier.hkuros65618en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034852928&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume20en_HK
dc.identifier.issue1en_HK
dc.identifier.spage489en_HK
dc.identifier.epage493en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridUglow, RF=6603740514en_HK
dc.identifier.scopusauthoridWilliams, GA=7406082821en_HK

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