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Article: Algal seasonality on an exposed rocky shore in Hong Kong and the dietary implications for the herbivorous crab Grapsus albolineatus

TitleAlgal seasonality on an exposed rocky shore in Hong Kong and the dietary implications for the herbivorous crab Grapsus albolineatus
Authors
Issue Date1996
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00227/index.htm
Citation
Marine Biology, 1996, v. 125 n. 1, p. 55-64 How to Cite?
AbstractPatterns of algal seasonality, and their effect on the diet and feeding preferences of the herbivorous crab Grapsus albolineatus, were investigated over an 18-mo period from March 1993 to August 1994 on an exposed tropical rocky shore (Hok Tsui Peninsula at Cape d' Aguilar, Hong Kong). Algal cover was greatest in the winter months, and lowest in the summer. Foliose algae such as Ulva fasciata, Porphyra suborbiculata, and Dermonema frappieri were dominant in the winter, but died off in the summer. During the hot summer months, perennial encrusting algae e.g., Ralfsia expansa, Hildenbrandia rubra, H. occidentalis, coralline crusts and the encrusting cyanobacteria Kyrtuthrix maculans, were the dominant algal species. Seasonal variation in algal abundance influenced the dietary selectivity of the herbivorous crab G. albolineatus. In the winter, the crab fed selectively on filamentous algae (e.g. Hineksia spp., Cladophora spp., Enteromorpha spp., and the cyanobacteria Lyngbya sp.). Foliose algae (e.g.U. fasciata, P. suborbiculata, Pterocladia tenuis) formed a small part of the diet, despite being the dominant species on the shore, Foliose and filamentous algae were virtually absent from the shore in the summer, and the crabs switched to feeding solely on encrusting algae. Electivity indices revealed preferences for green and brown turf species, and avoidance of foliose algae. Faecal analysis revealed that a greater proportion of the food is digested in the winter, suggesting that G. albolineatus is able to digest filamentous algae more efficiently than encrusting algae. Feeding preferences of G. albolineatus appear to be influenced by a number of factors, including the availability, digestibility and morphology of algae. The foraging behaviour and cheliped morphology of the crab also affect food choice. The monsoonal nature of Hong Kong's climate controls the diversity and abundance of intertidal algae and, therefore, indirectly influences the diet and subsequent growth and reproductive success of the herbivorous crab G. albolineatus.
Persistent Identifierhttp://hdl.handle.net/10722/73364
ISSN
2015 Impact Factor: 2.375
2015 SCImago Journal Rankings: 1.302
References

 

DC FieldValueLanguage
dc.contributor.authorKennish, Ren_HK
dc.contributor.authorWilliams, GAen_HK
dc.contributor.authorLee, SYen_HK
dc.date.accessioned2010-09-06T06:50:35Z-
dc.date.available2010-09-06T06:50:35Z-
dc.date.issued1996en_HK
dc.identifier.citationMarine Biology, 1996, v. 125 n. 1, p. 55-64en_HK
dc.identifier.issn0025-3162en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73364-
dc.description.abstractPatterns of algal seasonality, and their effect on the diet and feeding preferences of the herbivorous crab Grapsus albolineatus, were investigated over an 18-mo period from March 1993 to August 1994 on an exposed tropical rocky shore (Hok Tsui Peninsula at Cape d' Aguilar, Hong Kong). Algal cover was greatest in the winter months, and lowest in the summer. Foliose algae such as Ulva fasciata, Porphyra suborbiculata, and Dermonema frappieri were dominant in the winter, but died off in the summer. During the hot summer months, perennial encrusting algae e.g., Ralfsia expansa, Hildenbrandia rubra, H. occidentalis, coralline crusts and the encrusting cyanobacteria Kyrtuthrix maculans, were the dominant algal species. Seasonal variation in algal abundance influenced the dietary selectivity of the herbivorous crab G. albolineatus. In the winter, the crab fed selectively on filamentous algae (e.g. Hineksia spp., Cladophora spp., Enteromorpha spp., and the cyanobacteria Lyngbya sp.). Foliose algae (e.g.U. fasciata, P. suborbiculata, Pterocladia tenuis) formed a small part of the diet, despite being the dominant species on the shore, Foliose and filamentous algae were virtually absent from the shore in the summer, and the crabs switched to feeding solely on encrusting algae. Electivity indices revealed preferences for green and brown turf species, and avoidance of foliose algae. Faecal analysis revealed that a greater proportion of the food is digested in the winter, suggesting that G. albolineatus is able to digest filamentous algae more efficiently than encrusting algae. Feeding preferences of G. albolineatus appear to be influenced by a number of factors, including the availability, digestibility and morphology of algae. The foraging behaviour and cheliped morphology of the crab also affect food choice. The monsoonal nature of Hong Kong's climate controls the diversity and abundance of intertidal algae and, therefore, indirectly influences the diet and subsequent growth and reproductive success of the herbivorous crab G. albolineatus.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.titleAlgal seasonality on an exposed rocky shore in Hong Kong and the dietary implications for the herbivorous crab Grapsus albolineatusen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0025-3162&volume=125&spage=55&epage=64&date=1996&atitle=Algal+seasonality+on+an+exposed+rocky+shore+in+Hong+Kong+and+the+dietary+implications+for+the+herbivorous+crab+Grapsus+albolineatusen_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/BF00350760-
dc.identifier.scopuseid_2-s2.0-0029669509en_HK
dc.identifier.hkuros13733en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0029669509&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume125en_HK
dc.identifier.issue1en_HK
dc.identifier.spage55en_HK
dc.identifier.epage64en_HK
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridKennish, R=6603569636en_HK
dc.identifier.scopusauthoridWilliams, GA=7406082821en_HK
dc.identifier.scopusauthoridLee, SY=7601394910en_HK

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