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Article: Early development of algal assemblages under different regimes of physical and biotic factors on a seasonal tropical rocky shore

TitleEarly development of algal assemblages under different regimes of physical and biotic factors on a seasonal tropical rocky shore
Authors
KeywordsAssemblage development
Encrusting algae
Herbivores
Hong Kong
Physical stress
Tropical shores
Issue Date1998
PublisherInter-Research. The Journal's web site is located at http://www.int-res.com/journals/meps/index.html
Citation
Marine Ecology Progress Series, 1998, v. 172, p. 61-71 How to Cite?
AbstractThe roles of physical factors and herbivory in structuring the early development of algal assemblages were investigated on a seasonal, tropical rocky shore in Hong Kong. Physical stress was manipulated by irrigating areas with filtered seawater, whilst herbivore access was controlled using fences. Algal colonisation was monitored at 2 tidal heights (high- and lowshore), once in the cool and dry season and once in the hot and wet season. Dry areas were only colonised in the lowshore and, even when herbivores were excluded, dry highshore areas never developed a macroalgal cover. Algal assemblages did however, develop in highshore irrigated areas where, in the presence of herbivores, encrusting algae (e.g. Hapalospongidion gelatinosum and coralline crusts) developed. In areas excluding herbivores, ephemeral erect algae (e.g. Ulva spp.) developed. All lowshore treatments developed algal assemblages. In the hot season, after an initial phase of erect algae, encrusting algae developed where herbivores had access, whereas, in the cool season, erect Corallina spp. dominated these treatments. In herbivore exclusions, erect ephemeral algae developed in the hot season with a sparse cover of encrusting algae (Ralfsia expansa and coralline crusts) whilst, in the cool season, a cover of Corallina spp. and erect ephemeral algae became abundant. When irrigation was terminated, erect algal cover decreased dramatically in each season in the highshore, although encrusting algae persisted at reduced cover. In lowshore areas, algal cover decreased marginally when irrigation was terminated and only during the hot season. The timing (i.e. hot or cool season) of liberation of rock space was, therefore. important for the development of algal assemblages. In lowshore areas, assemblages dominated by encrusting algae typical of rocky shores in Hong Kong developed only in the presence of herbivores and only during the hot season. During the cool season, Corallina spp. became dominant, while exclusion of herbivores (during either season) resulted in the development of ephemeral, erect algal assemblages.
Persistent Identifierhttp://hdl.handle.net/10722/57251
ISSN
2015 Impact Factor: 2.361
2015 SCImago Journal Rankings: 1.554
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorKaehler, Sen_HK
dc.contributor.authorWilliams, GAen_HK
dc.date.accessioned2010-04-12T01:30:56Z-
dc.date.available2010-04-12T01:30:56Z-
dc.date.issued1998en_HK
dc.identifier.citationMarine Ecology Progress Series, 1998, v. 172, p. 61-71en_HK
dc.identifier.issn0171-8630en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57251-
dc.description.abstractThe roles of physical factors and herbivory in structuring the early development of algal assemblages were investigated on a seasonal, tropical rocky shore in Hong Kong. Physical stress was manipulated by irrigating areas with filtered seawater, whilst herbivore access was controlled using fences. Algal colonisation was monitored at 2 tidal heights (high- and lowshore), once in the cool and dry season and once in the hot and wet season. Dry areas were only colonised in the lowshore and, even when herbivores were excluded, dry highshore areas never developed a macroalgal cover. Algal assemblages did however, develop in highshore irrigated areas where, in the presence of herbivores, encrusting algae (e.g. Hapalospongidion gelatinosum and coralline crusts) developed. In areas excluding herbivores, ephemeral erect algae (e.g. Ulva spp.) developed. All lowshore treatments developed algal assemblages. In the hot season, after an initial phase of erect algae, encrusting algae developed where herbivores had access, whereas, in the cool season, erect Corallina spp. dominated these treatments. In herbivore exclusions, erect ephemeral algae developed in the hot season with a sparse cover of encrusting algae (Ralfsia expansa and coralline crusts) whilst, in the cool season, a cover of Corallina spp. and erect ephemeral algae became abundant. When irrigation was terminated, erect algal cover decreased dramatically in each season in the highshore, although encrusting algae persisted at reduced cover. In lowshore areas, algal cover decreased marginally when irrigation was terminated and only during the hot season. The timing (i.e. hot or cool season) of liberation of rock space was, therefore. important for the development of algal assemblages. In lowshore areas, assemblages dominated by encrusting algae typical of rocky shores in Hong Kong developed only in the presence of herbivores and only during the hot season. During the cool season, Corallina spp. became dominant, while exclusion of herbivores (during either season) resulted in the development of ephemeral, erect algal assemblages.en_HK
dc.languageengen_HK
dc.publisherInter-Research. The Journal's web site is located at http://www.int-res.com/journals/meps/index.htmlen_HK
dc.relation.ispartofMarine Ecology Progress Seriesen_HK
dc.rightsMarine Ecology - Progress Series. Copyright © Inter-Research.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAssemblage developmenten_HK
dc.subjectEncrusting algaeen_HK
dc.subjectHerbivoresen_HK
dc.subjectHong Kongen_HK
dc.subjectPhysical stressen_HK
dc.subjectTropical shoresen_HK
dc.titleEarly development of algal assemblages under different regimes of physical and biotic factors on a seasonal tropical rocky shoreen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0171-8630&volume=172&spage=61&epage=71&date=1998&atitle=Early+development+of+algal+assemblages+under+different+regimes+of+physical+and+biotic+factors+on+a+seasonal+tropical+rocky+shoreen_HK
dc.identifier.emailWilliams, GA: hrsbwga@hkucc.hku.hken_HK
dc.identifier.authorityWilliams, GA=rp00804en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.3354/meps172061en_HK
dc.identifier.scopuseid_2-s2.0-0032558729en_HK
dc.identifier.hkuros39710-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032558729&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume172en_HK
dc.identifier.spage61en_HK
dc.identifier.epage71en_HK
dc.identifier.isiWOS:000076817000006-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridKaehler, S=7004262046en_HK
dc.identifier.scopusauthoridWilliams, GA=7406082821en_HK

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