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Article: Stable isotope investigation of food use by Caridina spp. (Decapoda:Atyidae) in Hong Kong streams

TitleStable isotope investigation of food use by Caridina spp. (Decapoda:Atyidae) in Hong Kong streams
Authors
Keywordsδ13C
δ15N
Dual-isotope multiple-source mixing model
FPOM
Leaf litter
Periphyton
Shrimps
Stable isotopes
Tropical Asian streams
Issue Date2005
PublisherNorth American Benthological Society. The Journal's web site is located at http://www.benthos.org
Citation
Journal Of The North American Benthological Society, 2005, v. 24 n. 1, p. 68-81 How to Cite?
AbstractCaridina spp. (Atyidae) are widespread and abundant omnivorous shrimps in tropical Asian streams. Spatial and seasonal variation in C and N stable isotope signatures of 2 species (Caridina cantonensis and C. serrata) and their potential food sources (leaf litter, fine particulate organic matter [FPOM], and periphyton) were investigated in 2 shaded and 2 unshaded Hong Kong streams. The objectives were to identify food sources used by shrimps and to determine whether food use changed according to riparian shading, season, developmental stage, and sex. Isotopic signatures of different species of leaf litter were similar to each other and distinct from FPOM signatures in all streams, whereas periphyton δ13C and δ15N signatures were similar to FPOM signatures. FPOM and periphyton showed seasonal variation in δ13C and δ15N signatures in all streams, but signatures of leaf litter showed relatively minor variation. δ13C signatures of FPOM were 7 to 12‰ (shaded streams) and 5 to 7‰ (unshaded streams) higher than those of leaf litter during the dry season, and 5 to 8‰ (shaded streams) and 4 to 7‰ (unshaded streams) higher during the wet than the dry season. δ15N signatures of FPOM were almost 2x those of leaf litter in all streams and seasons. Periphyton was generally ≤6‰ more 13C-enriched and ≤4‰ 15N-depleted than FPOM. Seasonal variation in δ13C signatures of shrimps and their food sources were consistent among streams, and were less 15N-depleted during the dry season. Dual-isotope multiple-source mixing models indicated that FPOM and periphyton were the main foods of adult (male and female) and juvenile C. cantonensis and C serrata. Leaf litter contributed <10% to the biomass of C. cantonensis in unshaded streams and 10 to 20% to the biomass of both species in shaded streams. Periphyton contributed >60% to the biomass of C. cantonensis in unshaded streams in the wet season, with the proportion slightly higher during the dry season. In shaded streams, periphyton contributed 35 to 60% to Caridina spp. biomass. Our results indicate that the Hong Kong atyids feed as omnivores, with herbivory as a primary feeding mode supplemented by collection of FPOM and limited direct consumption of allochthonous leaf litter. © 2005 by The North American Benthological Society.
Persistent Identifierhttp://hdl.handle.net/10722/73314
ISSN
2013 Impact Factor: 2.706
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYam, RSWen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2010-09-06T06:50:08Z-
dc.date.available2010-09-06T06:50:08Z-
dc.date.issued2005en_HK
dc.identifier.citationJournal Of The North American Benthological Society, 2005, v. 24 n. 1, p. 68-81en_HK
dc.identifier.issn0887-3593en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73314-
dc.description.abstractCaridina spp. (Atyidae) are widespread and abundant omnivorous shrimps in tropical Asian streams. Spatial and seasonal variation in C and N stable isotope signatures of 2 species (Caridina cantonensis and C. serrata) and their potential food sources (leaf litter, fine particulate organic matter [FPOM], and periphyton) were investigated in 2 shaded and 2 unshaded Hong Kong streams. The objectives were to identify food sources used by shrimps and to determine whether food use changed according to riparian shading, season, developmental stage, and sex. Isotopic signatures of different species of leaf litter were similar to each other and distinct from FPOM signatures in all streams, whereas periphyton δ13C and δ15N signatures were similar to FPOM signatures. FPOM and periphyton showed seasonal variation in δ13C and δ15N signatures in all streams, but signatures of leaf litter showed relatively minor variation. δ13C signatures of FPOM were 7 to 12‰ (shaded streams) and 5 to 7‰ (unshaded streams) higher than those of leaf litter during the dry season, and 5 to 8‰ (shaded streams) and 4 to 7‰ (unshaded streams) higher during the wet than the dry season. δ15N signatures of FPOM were almost 2x those of leaf litter in all streams and seasons. Periphyton was generally ≤6‰ more 13C-enriched and ≤4‰ 15N-depleted than FPOM. Seasonal variation in δ13C signatures of shrimps and their food sources were consistent among streams, and were less 15N-depleted during the dry season. Dual-isotope multiple-source mixing models indicated that FPOM and periphyton were the main foods of adult (male and female) and juvenile C. cantonensis and C serrata. Leaf litter contributed <10% to the biomass of C. cantonensis in unshaded streams and 10 to 20% to the biomass of both species in shaded streams. Periphyton contributed >60% to the biomass of C. cantonensis in unshaded streams in the wet season, with the proportion slightly higher during the dry season. In shaded streams, periphyton contributed 35 to 60% to Caridina spp. biomass. Our results indicate that the Hong Kong atyids feed as omnivores, with herbivory as a primary feeding mode supplemented by collection of FPOM and limited direct consumption of allochthonous leaf litter. © 2005 by The North American Benthological Society.en_HK
dc.languageengen_HK
dc.publisherNorth American Benthological Society. The Journal's web site is located at http://www.benthos.orgen_HK
dc.relation.ispartofJournal of the North American Benthological Societyen_HK
dc.subjectδ13Cen_HK
dc.subjectδ15Nen_HK
dc.subjectDual-isotope multiple-source mixing modelen_HK
dc.subjectFPOMen_HK
dc.subjectLeaf litteren_HK
dc.subjectPeriphytonen_HK
dc.subjectShrimpsen_HK
dc.subjectStable isotopesen_HK
dc.subjectTropical Asian streamsen_HK
dc.titleStable isotope investigation of food use by Caridina spp. (Decapoda:Atyidae) in Hong Kong streamsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0887-3593&volume=24&issue=1&spage=68&epage=81&date=2005&atitle=Stable+isotope+investigation+of+food+use+by+Caridina+spp.+(Decapoda:Atyidae)+in+Hong+Kong+streams-
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1899/0887-3593(2005)024<0068:SIIOFU>2.0.CO;2en_HK
dc.identifier.scopuseid_2-s2.0-14344255842en_HK
dc.identifier.hkuros97855en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-14344255842&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue1en_HK
dc.identifier.spage68en_HK
dc.identifier.epage81en_HK
dc.identifier.isiWOS:000227149900005-
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridYam, RSW=8256687600en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK

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