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Article: Dietary variation in a predatory shrimp Macrobrachium hainanense (Palaemonidae) in Hong Kong forest streams

TitleDietary variation in a predatory shrimp Macrobrachium hainanense (Palaemonidae) in Hong Kong forest streams
Authors
Keywordsδ13C and δ15N stable isotopes
Gut contents
Ontogenetic and sexual dietary differences
Prey selection
Seasonality
Issue Date2004
PublisherE Schweizerbart'sche Verlagsbuchhandlung. The Journal's web site is located at http://www.schweizerbart.de/j/archiv-hydrobiologie
Citation
Archiv Fur Hydrobiologie, 2004, v. 160 n. 3, p. 305-328 How to Cite?
AbstractMacrobrachium hainanense is a large palaemonid shrimp (total length > 7 cm), present at high densities (> 2 individuals m-2) in pools of low-order forested streams in Hong Kong, Southern China. The present study investigated the diet and trophic status of this shrimp in pools of Tai Po Kau Forest Stream (TPK) and Tai Shing Stream (TSS). Macrobrachium hainanense was a generalist predator that fed selectively on sedentary and slow-moving prey (snails, chironomid larvae and calamo-ceratid caddisflies) eating them disproportionately relative to their abundance in pool benthic communities. Shrimp diets varied by size of the individual, by season and by stream. The diet of large males was dominated by the thiarid snail Brotia hainanensis, and ovigerous females had guts that were half as full as large females although their diet was similar to other life stages. Gut fullness was reduced in shrimps that had molted recently. Over 80 % of the food items eaten by M. hainanense at TPK during the wet season were B. hainanensis, while the dry season diet included a greater number of taxa including tube-dwelling Chironomidae (31 %), Trichoptera (25 %) and Ephemeroptera (24 %). This pattern of seasonal variation was less noticeable at TSS than at TPK. TPK M. hainanense had less full guts (∼ 50 %) than those at TSS (∼ 70 %), but, at both sites, shrimps with empty guts were encountered only during the wet season. The predaceous nature of M. hainanense through all life stages is in contrast to the omnivorous or detritivorous habit of other Macrobrachium species. The results of δ15N and δ13C stable isotope analysis of samples from TPK confirmed the predatory trophic status of M. hainanense. All life stages had isotopic signatures that were higher than to sympatric predatory invertebrates (e. g. Odonata). Allochthonous detritus made no direct contribution to the assimilated tissue of M. hainanense.
Persistent Identifierhttp://hdl.handle.net/10722/73345
ISSN
2008 Impact Factor: 1.293
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMantel, SKen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2010-09-06T06:50:25Z-
dc.date.available2010-09-06T06:50:25Z-
dc.date.issued2004en_HK
dc.identifier.citationArchiv Fur Hydrobiologie, 2004, v. 160 n. 3, p. 305-328en_HK
dc.identifier.issn0003-9136en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73345-
dc.description.abstractMacrobrachium hainanense is a large palaemonid shrimp (total length > 7 cm), present at high densities (> 2 individuals m-2) in pools of low-order forested streams in Hong Kong, Southern China. The present study investigated the diet and trophic status of this shrimp in pools of Tai Po Kau Forest Stream (TPK) and Tai Shing Stream (TSS). Macrobrachium hainanense was a generalist predator that fed selectively on sedentary and slow-moving prey (snails, chironomid larvae and calamo-ceratid caddisflies) eating them disproportionately relative to their abundance in pool benthic communities. Shrimp diets varied by size of the individual, by season and by stream. The diet of large males was dominated by the thiarid snail Brotia hainanensis, and ovigerous females had guts that were half as full as large females although their diet was similar to other life stages. Gut fullness was reduced in shrimps that had molted recently. Over 80 % of the food items eaten by M. hainanense at TPK during the wet season were B. hainanensis, while the dry season diet included a greater number of taxa including tube-dwelling Chironomidae (31 %), Trichoptera (25 %) and Ephemeroptera (24 %). This pattern of seasonal variation was less noticeable at TSS than at TPK. TPK M. hainanense had less full guts (∼ 50 %) than those at TSS (∼ 70 %), but, at both sites, shrimps with empty guts were encountered only during the wet season. The predaceous nature of M. hainanense through all life stages is in contrast to the omnivorous or detritivorous habit of other Macrobrachium species. The results of δ15N and δ13C stable isotope analysis of samples from TPK confirmed the predatory trophic status of M. hainanense. All life stages had isotopic signatures that were higher than to sympatric predatory invertebrates (e. g. Odonata). Allochthonous detritus made no direct contribution to the assimilated tissue of M. hainanense.en_HK
dc.languageengen_HK
dc.publisherE Schweizerbart'sche Verlagsbuchhandlung. The Journal's web site is located at http://www.schweizerbart.de/j/archiv-hydrobiologieen_HK
dc.relation.ispartofArchiv fur Hydrobiologieen_HK
dc.subjectδ13C and δ15N stable isotopesen_HK
dc.subjectGut contentsen_HK
dc.subjectOntogenetic and sexual dietary differencesen_HK
dc.subjectPrey selectionen_HK
dc.subjectSeasonalityen_HK
dc.titleDietary variation in a predatory shrimp Macrobrachium hainanense (Palaemonidae) in Hong Kong forest streamsen_HK
dc.typeArticleen_HK
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1127/0003-9136/2004/0160-0305en_HK
dc.identifier.scopuseid_2-s2.0-3843108837en_HK
dc.identifier.hkuros89688en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-3843108837&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume160en_HK
dc.identifier.issue3en_HK
dc.identifier.spage305en_HK
dc.identifier.epage328en_HK
dc.identifier.isiWOS:000223129700002-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridMantel, SK=6603720784en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK

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