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Article: Dietary variation and food selection by an algivorous loach (Pseudogastromyzon myersi: Balitoridae) in Hong Kong streams

TitleDietary variation and food selection by an algivorous loach (Pseudogastromyzon myersi: Balitoridae) in Hong Kong streams
Authors
KeywordsAlgae
Cyanobacteria
Diatoms
Fish
Grazing
Herbivory
Periphyton
Stomach contents
Issue Date2010
PublisherCSIRO Publishing. The Journal's web site is located at http://www.publish.csiro.au/journals/mfr/
Citation
Marine And Freshwater Research, 2010, v. 61 n. 1, p. 49-56 How to Cite?
AbstractThe algivorous balitorid loach Pseudogastromyzon myersi is abundant in Hong Kong streams where it may exert top-down control on benthic algal assemblages as reported for grazing fish in temperate and neotropical streams. Dietary selectivity by P. myersi was investigated in two shaded and two unshaded streams during the wet and dry seasons, thereby allowing for variation in the potential bottom-up influences of light and flow on algae. Fish stomach contents were compared with the benthic algal assemblages to assess selectivity and to test whether algal growth form influenced susceptibility to grazing. Diatoms and filamentous cyanobacteria dominated the diets of the fish, regardless of stream or season; most of the remainder of the stomach contents comprised fine particulate organic matter (FPOM). Stalked diatoms (Gomphonema) and filamentous cyanobacteria (Homeothrix) were the most important dietary items, with the former selected during the dry season and the latter in the wet season. Adherent diatoms (Achnanthes) were underrepresented in the diet, and filamentous chlorophytes were rarely eaten. Seasonal changes in diet were minor. Interstream variations reflected differences in the proportions of Gomphonema, Homeothrix and FPOM ingested, and were unrelated to shading. Grazing by P. myersi may influence algal composition and productivity by removing loosely attached diatoms and facilitating growth of filamentous cyanobacteria. © 2010 CSIRO.
Persistent Identifierhttp://hdl.handle.net/10722/142060
ISSN
2015 Impact Factor: 1.583
2015 SCImago Journal Rankings: 0.821
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong Kong Special Administrative Region, China7619/05
Hong Kong University postgraduate studentship
Funding Information:

We are grateful to the Director, Agriculture, Fisheries and Conservation Department of the Hong Kong SAR Government for issuing collecting permits and to Lily Ng for technical support in the laboratory. Tang Tao gave advice on algal identification, Yixin Zhang made constructive suggestions at an early stage in the study and Danny Lau, Aggie Li and Nancy Karraker provided helpful comments on preliminary manuscript drafts. We thank Steve Blaber, Andrew Boulton and an anonymous referee for suggestions that improved this paper. Our work was supported in part by a grant from the Research Grants Council of Hong Kong Special Administrative Region, China (Project No. (HKU) 7619/05) and by a Hong Kong University postgraduate studentship awarded to G. Y.

References

 

DC FieldValueLanguage
dc.contributor.authorYang, GYen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2011-10-18T06:28:29Z-
dc.date.available2011-10-18T06:28:29Z-
dc.date.issued2010en_HK
dc.identifier.citationMarine And Freshwater Research, 2010, v. 61 n. 1, p. 49-56en_HK
dc.identifier.issn1323-1650en_HK
dc.identifier.urihttp://hdl.handle.net/10722/142060-
dc.description.abstractThe algivorous balitorid loach Pseudogastromyzon myersi is abundant in Hong Kong streams where it may exert top-down control on benthic algal assemblages as reported for grazing fish in temperate and neotropical streams. Dietary selectivity by P. myersi was investigated in two shaded and two unshaded streams during the wet and dry seasons, thereby allowing for variation in the potential bottom-up influences of light and flow on algae. Fish stomach contents were compared with the benthic algal assemblages to assess selectivity and to test whether algal growth form influenced susceptibility to grazing. Diatoms and filamentous cyanobacteria dominated the diets of the fish, regardless of stream or season; most of the remainder of the stomach contents comprised fine particulate organic matter (FPOM). Stalked diatoms (Gomphonema) and filamentous cyanobacteria (Homeothrix) were the most important dietary items, with the former selected during the dry season and the latter in the wet season. Adherent diatoms (Achnanthes) were underrepresented in the diet, and filamentous chlorophytes were rarely eaten. Seasonal changes in diet were minor. Interstream variations reflected differences in the proportions of Gomphonema, Homeothrix and FPOM ingested, and were unrelated to shading. Grazing by P. myersi may influence algal composition and productivity by removing loosely attached diatoms and facilitating growth of filamentous cyanobacteria. © 2010 CSIRO.en_HK
dc.languageeng-
dc.publisherCSIRO Publishing. The Journal's web site is located at http://www.publish.csiro.au/journals/mfr/en_HK
dc.relation.ispartofMarine and Freshwater Researchen_HK
dc.subjectAlgaeen_HK
dc.subjectCyanobacteriaen_HK
dc.subjectDiatomsen_HK
dc.subjectFishen_HK
dc.subjectGrazingen_HK
dc.subjectHerbivoryen_HK
dc.subjectPeriphytonen_HK
dc.subjectStomach contentsen_HK
dc.titleDietary variation and food selection by an algivorous loach (Pseudogastromyzon myersi: Balitoridae) in Hong Kong streamsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1323-1650&volume=61&issue=1&spage=49&epage=56&date=2010&atitle=Dietary+variation+and+food+selection+by+an+algivorous+loach+(Pseudogastromyzon+myersi:+Balitoridae)+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.doi10.1071/MF09032en_HK
dc.identifier.scopuseid_2-s2.0-76849106792en_HK
dc.identifier.hkuros179041-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-76849106792&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume61en_HK
dc.identifier.issue1en_HK
dc.identifier.spage49en_HK
dc.identifier.epage56en_HK
dc.identifier.isiWOS:000274060300006-
dc.publisher.placeAustraliaen_HK
dc.identifier.scopusauthoridYang, GY=26645276500en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK

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