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Article: Selection of gastropod prey by a tropical freshwater crab

TitleSelection of gastropod prey by a tropical freshwater crab
Authors
Issue Date1990
Citation
Journal Of Zoology, 1990, v. 220 n. 1, p. 147-155 How to Cite?
AbstractPrey selection by Somaniathelphusa sinensis (Parathelphusidae) among 5 gastropod species was associated with 2 snail attributes. 1) The degree of defence of the tissues by the shell, approximated by shell weight tissue dry weight (M). Snails with the heaviest shells (Sinotaia quadrata: Viviparidae) could not be attacked successfully by any crabs, and those with somewhat lighter shells (Melanoides tuberculata: Thiaridae) were protected from small crabs. 2) Among those light-shelled snails which could be attacked successfully, prey value (M/handling time, Ht) determined rank order of preference. Biomphalaria straminea (Planorbidae) with the highest M/Ht, was the species most readily eaten. When presented with a single snail species, crabs selected among different-size B. straminea in a way which maximized M/Ht. This preference was most strongly exhibited by small crabs. A lack of size selection for Radix plicatulus (Lymnaeidae) prey was in agreement with an absence of a clear influence of size on Ht for this species. Manipulation of M/Ht by attaching plastic discs to B. straminea shells (thereby increasing Ht) resulting in patterns of prey selection in accordance with the hypothesis that foraging S. sinensis maximized M/Ht. Partial consumption of R. plicatulus, and to a lesser degree Physella acuta (Physidae), was common when groups of snails were presented to individual crabs, and occurred more frequently when large snails were offered. Implications of patterns of prey selection were discussed with reference to the influence of crab predation on snail distribution and abundance in Hong Kong fresh waters. -from Authors
Persistent Identifierhttp://hdl.handle.net/10722/178487
ISSN
2015 Impact Factor: 1.819
2015 SCImago Journal Rankings: 1.032

 

DC FieldValueLanguage
dc.contributor.authorDudgeon, Den_US
dc.contributor.authorCheung Pui Shan, Cen_US
dc.date.accessioned2012-12-19T09:47:59Z-
dc.date.available2012-12-19T09:47:59Z-
dc.date.issued1990en_US
dc.identifier.citationJournal Of Zoology, 1990, v. 220 n. 1, p. 147-155en_US
dc.identifier.issn0952-8369en_US
dc.identifier.urihttp://hdl.handle.net/10722/178487-
dc.description.abstractPrey selection by Somaniathelphusa sinensis (Parathelphusidae) among 5 gastropod species was associated with 2 snail attributes. 1) The degree of defence of the tissues by the shell, approximated by shell weight tissue dry weight (M). Snails with the heaviest shells (Sinotaia quadrata: Viviparidae) could not be attacked successfully by any crabs, and those with somewhat lighter shells (Melanoides tuberculata: Thiaridae) were protected from small crabs. 2) Among those light-shelled snails which could be attacked successfully, prey value (M/handling time, Ht) determined rank order of preference. Biomphalaria straminea (Planorbidae) with the highest M/Ht, was the species most readily eaten. When presented with a single snail species, crabs selected among different-size B. straminea in a way which maximized M/Ht. This preference was most strongly exhibited by small crabs. A lack of size selection for Radix plicatulus (Lymnaeidae) prey was in agreement with an absence of a clear influence of size on Ht for this species. Manipulation of M/Ht by attaching plastic discs to B. straminea shells (thereby increasing Ht) resulting in patterns of prey selection in accordance with the hypothesis that foraging S. sinensis maximized M/Ht. Partial consumption of R. plicatulus, and to a lesser degree Physella acuta (Physidae), was common when groups of snails were presented to individual crabs, and occurred more frequently when large snails were offered. Implications of patterns of prey selection were discussed with reference to the influence of crab predation on snail distribution and abundance in Hong Kong fresh waters. -from Authorsen_US
dc.languageengen_US
dc.relation.ispartofJournal of Zoologyen_US
dc.titleSelection of gastropod prey by a tropical freshwater craben_US
dc.typeArticleen_US
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_US
dc.identifier.authorityDudgeon, D=rp00691en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0025247334en_US
dc.identifier.volume220en_US
dc.identifier.issue1en_US
dc.identifier.spage147en_US
dc.identifier.epage155en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridDudgeon, D=7006559840en_US
dc.identifier.scopusauthoridCheung Pui Shan, C=6505469711en_US

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