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Article: The effects of seagrass (Zostera japonica) canopy structure on associated fauna: A study using artificial seagrass units and sampling of natural beds

TitleThe effects of seagrass (Zostera japonica) canopy structure on associated fauna: A study using artificial seagrass units and sampling of natural beds
Authors
KeywordsArtificial seagrass units
Associated fauna
Canopy structure
Zostera japonica
Issue Date2001
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jembe
Citation
Journal Of Experimental Marine Biology And Ecology, 2001, v. 259 n. 1, p. 23-50 How to Cite?
AbstractThe importance of seagrass canopy to associated fauna was assessed by comparing the species richness, abundance and diversity of the epi- and infaunal macroinvertebrate assemblages in a seagrass (Zostera japonica Ascherson and Graebner) bed and the adjacent unvegetated area in Hong Kong. Seagrass cover had significant effects on the composition and abundance of the associated fauna and the amount of detritus accumulated on the sediment surface. Detritus abundance was significantly higher in the seagrass bed, and was positively correlated with both the above- and belowground biomass of Z. japonica. Both the abundance and species richness of the epi- and infauna were significantly positively correlated with the belowground biomass of the seagrass and detritus standing crop. Macrofaunal species richness was higher (118) in the seagrass bed than the adjacent unvegetated areas (70), with a higher degree of similarity between the infauna than the epifauna of the two habitats. While all species recorded from the unvegetated areas were found in the seagrass bed, 48 species occurred only in the seagrass-covered areas. Species richness of epifauna was significantly higher in the seagrass bed, but there was no difference between infaunal species of the two habitats. On the contrary, faunal (epi- and infauna) abundance was significantly higher in seagrass areas. The seagrass bed also supported species of small tellinid bivalves previously not recorded from Hong Kong. Artificial seagrass units (ASUs, 0.2 m2) with four combinations of leaf density and leaf length and a control (bare sand) were placed at short distances from natural parches of Z. japonica. The composition, abundance and biomass of the epibenthos associated with the ASUs and the control were recorded after 3 months in the field. While species richness did not differ among the treatments, total abundance of epibenthos was significantly higher in the high density-long leaves (HL) treatment than in the control. Results of a discriminant analysis using log-transformed abundance data suggest that the gastropod Clithon oualaniensis, the mussel Musculista senhousia and the crab Thalamita sp. were important species distinguishing the assemblages in the various treatments. All the three species were significantly more abundant in the HL treatment than in the low density-short leaves (LS) treatment and the control. By contrast, there was no significant difference in the biomass of the epifauna, but discriminant analysis again separated the five treatments based on the composition of the biomass, with the same three species identified as the most important discriminating species. The species richness and abundance of the epifauna associated with the ASUs were similar to the adjacent unvegetated areas, but significantly lower than in the Zostera patches. The physical canopy structure of Z. japonica beds increased the abundance of the epibenthos, potentially through provision of canopy and indirectly through trapping of detritus. © 2001 Elsevier Science B.V.
Persistent Identifierhttp://hdl.handle.net/10722/92707
ISSN
2015 Impact Factor: 1.796
2015 SCImago Journal Rankings: 1.029
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLee, SYen_HK
dc.contributor.authorFong, CWen_HK
dc.contributor.authorWu, RSSen_HK
dc.date.accessioned2010-09-17T10:54:48Z-
dc.date.available2010-09-17T10:54:48Z-
dc.date.issued2001en_HK
dc.identifier.citationJournal Of Experimental Marine Biology And Ecology, 2001, v. 259 n. 1, p. 23-50en_HK
dc.identifier.issn0022-0981en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92707-
dc.description.abstractThe importance of seagrass canopy to associated fauna was assessed by comparing the species richness, abundance and diversity of the epi- and infaunal macroinvertebrate assemblages in a seagrass (Zostera japonica Ascherson and Graebner) bed and the adjacent unvegetated area in Hong Kong. Seagrass cover had significant effects on the composition and abundance of the associated fauna and the amount of detritus accumulated on the sediment surface. Detritus abundance was significantly higher in the seagrass bed, and was positively correlated with both the above- and belowground biomass of Z. japonica. Both the abundance and species richness of the epi- and infauna were significantly positively correlated with the belowground biomass of the seagrass and detritus standing crop. Macrofaunal species richness was higher (118) in the seagrass bed than the adjacent unvegetated areas (70), with a higher degree of similarity between the infauna than the epifauna of the two habitats. While all species recorded from the unvegetated areas were found in the seagrass bed, 48 species occurred only in the seagrass-covered areas. Species richness of epifauna was significantly higher in the seagrass bed, but there was no difference between infaunal species of the two habitats. On the contrary, faunal (epi- and infauna) abundance was significantly higher in seagrass areas. The seagrass bed also supported species of small tellinid bivalves previously not recorded from Hong Kong. Artificial seagrass units (ASUs, 0.2 m2) with four combinations of leaf density and leaf length and a control (bare sand) were placed at short distances from natural parches of Z. japonica. The composition, abundance and biomass of the epibenthos associated with the ASUs and the control were recorded after 3 months in the field. While species richness did not differ among the treatments, total abundance of epibenthos was significantly higher in the high density-long leaves (HL) treatment than in the control. Results of a discriminant analysis using log-transformed abundance data suggest that the gastropod Clithon oualaniensis, the mussel Musculista senhousia and the crab Thalamita sp. were important species distinguishing the assemblages in the various treatments. All the three species were significantly more abundant in the HL treatment than in the low density-short leaves (LS) treatment and the control. By contrast, there was no significant difference in the biomass of the epifauna, but discriminant analysis again separated the five treatments based on the composition of the biomass, with the same three species identified as the most important discriminating species. The species richness and abundance of the epifauna associated with the ASUs were similar to the adjacent unvegetated areas, but significantly lower than in the Zostera patches. The physical canopy structure of Z. japonica beds increased the abundance of the epibenthos, potentially through provision of canopy and indirectly through trapping of detritus. © 2001 Elsevier Science B.V.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jembeen_HK
dc.relation.ispartofJournal of Experimental Marine Biology and Ecologyen_HK
dc.subjectArtificial seagrass unitsen_HK
dc.subjectAssociated faunaen_HK
dc.subjectCanopy structureen_HK
dc.subjectZostera japonicaen_HK
dc.titleThe effects of seagrass (Zostera japonica) canopy structure on associated fauna: A study using artificial seagrass units and sampling of natural bedsen_HK
dc.typeArticleen_HK
dc.identifier.emailWu, RSS: rudolfwu@hku.hken_HK
dc.identifier.authorityWu, RSS=rp01398en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0022-0981(01)00221-0en_HK
dc.identifier.scopuseid_2-s2.0-0035972068en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035972068&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume259en_HK
dc.identifier.issue1en_HK
dc.identifier.spage23en_HK
dc.identifier.epage50en_HK
dc.identifier.isiWOS:000168386600002-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLee, SY=7601394910en_HK
dc.identifier.scopusauthoridFong, CW=7102179117en_HK
dc.identifier.scopusauthoridWu, RSS=7402945079en_HK
dc.identifier.citeulike10346515-

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