Quantification of Shell Banding Polymorphism in the East African Tree Snail Sitala Jenynsi (Pulmonata: Ariophantidae)

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dc.contributor.authorKasigwa, Peter F.
dc.contributor.authorAllen, John A.
dc.date.accessioned2016-07-11T14:53:14Z
dc.date.available2016-07-11T14:53:14Z
dc.date.issued2007
dc.descriptionFull text can be accessed at http://www.tandfonline.com/doi/abs/10.1080/15627020.2007.11407378en_US
dc.description.abstractIn eastern Africa, populations of the tree snail Sitala jenynsi are monomorphic, dimorphic or trimorphic for the width of the upper brown band on their shells.We measured the variation in the width of this band in several populations and analysed it using two mutually verifiable methods: arithmetical probability paper and regressions of log-transformed shell metrics. The demarcations of the three morphs in areas of spatial overlap between the band-width states have been defined. We recognized existence of type I narrow-banding which associates monomorphism, and type II narrow-banding, medium banding and wide-banding forms which associate polymorphism. We have also quantified the variation in three other characters, two of which are also polymorphic: a lower pigmented band and an upper unpigmented ‘ghost band’. The evolutionary implications of the findings are discussed. Continued use of varietal names to describe the banding polymorphism of S. jenynsi is recommended, in preference to the multidimensional colour pattern notation commonly applied to gastropods.en_US
dc.identifier.citationKasigwa, P.F. and Allen, J.A., 2007. Quantification of shell banding polymorphism in the East African tree snail Sitala jenynsi (Pulmonata: Ariophantidae). African Zoology, 42(1), pp.59-69.en_US
dc.identifier.doi10.1080/15627020.2007.11407378
dc.identifier.urihttp://hdl.handle.net/20.500.11810/3080
dc.language.isoenen_US
dc.publisherTaylor and Francisen_US
dc.subjectMolluscaen_US
dc.subjectGastropodaen_US
dc.subjectPulmonataen_US
dc.subjectAriophantidaeen_US
dc.subjectSitala jenynsien_US
dc.subjectArboreal snailen_US
dc.subjectBand width polymorphismen_US
dc.titleQuantification of Shell Banding Polymorphism in the East African Tree Snail Sitala Jenynsi (Pulmonata: Ariophantidae)en_US
dc.typeJournal Article, Peer Revieweden_US
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