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Article: An assessment of variation in molluscan grazing pressure on Hong Kong rocky shores

TitleAn assessment of variation in molluscan grazing pressure on Hong Kong rocky shores
Authors
Issue Date2003
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00227/index.htm
Citation
Marine Biology, 2003, v. 142 n. 3, p. 495-507 How to Cite?
AbstractSeveral methods of assessment have been used to document variation in grazing pressure on temperate rocky shores, although often these methods are applied without consideration of local conditions or species. In this study, a comparison was made between abundance counts of inactive molluscan grazers at low tide, direct observations of grazer activity and distribution throughout day and night tidal cycles, and records of grazing marks on wax discs, for the mid-shore of Hong Kong. The abundance of grazers found during low-tide counts varied among dates, sites and species. This method, however, did not record all grazer species that day/night observations showed to migrate from the low shore with the rising tide. Low-tide counts, therefore, underestimate grazing pressure (number of active grazers per unit area) and grazer guild (number of species). Grazing marks on wax discs also recorded a greater number of species than the low-tide counts of inactive grazers, and included grazers that were seen to migrate up shore during day/night observations. Certain limpet species, however, avoided the wax and did not leave grazing marks, showing this method to also underestimate grazing pressure. All methods showed grazing pressure to be variable at spatial scales of tens of metres or less and also temporally variable between sampling dates. The sole use of either low-tide counts or wax discs is likely to underestimate grazing pressure, due to variation in shore topography and grazer foraging behaviour, especially on shores with a narrow tidal range such as in Hong Kong. To gain a more accurate assessment of total grazing pressure, it is suggested that recording of grazing marks on wax discs should be used in conjunction with direct day/night observations.
Persistent Identifierhttp://hdl.handle.net/10722/73125
ISSN
2015 Impact Factor: 2.375
2015 SCImago Journal Rankings: 1.302
References

 

DC FieldValueLanguage
dc.contributor.authorHutchinson, Nen_HK
dc.contributor.authorWilliams, GAen_HK
dc.date.accessioned2010-09-06T06:48:24Z-
dc.date.available2010-09-06T06:48:24Z-
dc.date.issued2003en_HK
dc.identifier.citationMarine Biology, 2003, v. 142 n. 3, p. 495-507en_HK
dc.identifier.issn0025-3162en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73125-
dc.description.abstractSeveral methods of assessment have been used to document variation in grazing pressure on temperate rocky shores, although often these methods are applied without consideration of local conditions or species. In this study, a comparison was made between abundance counts of inactive molluscan grazers at low tide, direct observations of grazer activity and distribution throughout day and night tidal cycles, and records of grazing marks on wax discs, for the mid-shore of Hong Kong. The abundance of grazers found during low-tide counts varied among dates, sites and species. This method, however, did not record all grazer species that day/night observations showed to migrate from the low shore with the rising tide. Low-tide counts, therefore, underestimate grazing pressure (number of active grazers per unit area) and grazer guild (number of species). Grazing marks on wax discs also recorded a greater number of species than the low-tide counts of inactive grazers, and included grazers that were seen to migrate up shore during day/night observations. Certain limpet species, however, avoided the wax and did not leave grazing marks, showing this method to also underestimate grazing pressure. All methods showed grazing pressure to be variable at spatial scales of tens of metres or less and also temporally variable between sampling dates. The sole use of either low-tide counts or wax discs is likely to underestimate grazing pressure, due to variation in shore topography and grazer foraging behaviour, especially on shores with a narrow tidal range such as in Hong Kong. To gain a more accurate assessment of total grazing pressure, it is suggested that recording of grazing marks on wax discs should be used in conjunction with direct day/night observations.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.titleAn assessment of variation in molluscan grazing pressure on Hong Kong rocky shoresen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0025-3162&volume=142&spage=495&epage=507&date=2003&atitle=An+assessment+of+variation+in+molluscan+grazing+pressure+on+Hong+Kong+rocky+shoresen_HK
dc.identifier.emailWilliams, GA: hrsbwga@hkucc.hku.hken_HK
dc.identifier.authorityWilliams, GA=rp00804en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s00227-002-0985-4-
dc.identifier.scopuseid_2-s2.0-0038115342en_HK
dc.identifier.hkuros76151en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0038115342&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume142en_HK
dc.identifier.issue3en_HK
dc.identifier.spage495en_HK
dc.identifier.epage507en_HK
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridHutchinson, N=7007086021en_HK
dc.identifier.scopusauthoridWilliams, GA=7406082821en_HK

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