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Morphological differences associated with colour morphs of the auger snail Hastula cinerea (Conoidea: Terebridae) from north-east Brazil

Published online by Cambridge University Press:  04 September 2012

Wagner Franco Molina ,
Paulo Augusto de Lima Filho ,
Vivianne Fernandes Ribeiro Dantas ,
Clóvis Coutinho da Motta-Neto  and
Luiz Antonio Carlos Bertollo
Wagner Franco Molina*
Affiliation:
Department of Cellular and Genetic Biology, Biosciences Center, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
Paulo Augusto de Lima Filho
Affiliation:
Department of Cellular and Genetic Biology, Biosciences Center, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
Vivianne Fernandes Ribeiro Dantas
Affiliation:
Department of Cellular and Genetic Biology, Biosciences Center, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
Clóvis Coutinho da Motta-Neto
Affiliation:
Department of Cellular and Genetic Biology, Biosciences Center, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
Luiz Antonio Carlos Bertollo
Affiliation:
Department of Genetics and Evolution, São Carlos Federal University, São Carlos, São Paulo, Brazil
*
Correspondence should be addressed to: W.F. Molina, Departamento de Biologia Celular e Genética, Centro de Biociências, Universidade, Federal do Rio Grande  do Norte, Campus Universitário, CEP 59.078-970, Natal, Rio Grande do  Norte, Brazil email: [email protected]
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Abstract

Chromatic polymorphisms in shells may be associated with adaptive characteristics in molluscs. Colouring among Hastula cinerea reveals different patterns in large aggregations of individuals. Although the impacts of temperature are considered critical in the intertidal region, selective effects associated with colouring in H. cinerea shells, in addition to possible physiological consequences, remain an open issue. In this context, H. cinerea is a viable evolutionary model for investigating selective processes related to chromatic polymorphism in shells given its abundance and biological characteristics. Individuals from the same population were classified into three groups according to shell colour: light, reddish and dark. They were then examined with regard to frequency of colour morphs and morphological patterns in each group. Reddish and light-coloured specimens were the most abundant, while those with dark coloration were less common and morphologically distinct from the first two colour morphs. Morphological differences in the anterior region of dark shells, which may be associated with movement ability and lower frequencies in these specimens, suggest possible selective effects on types that are less reflective to light in the intertidal zone.

Keywords

chromatic polymorphismadaptationnatural selection
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 4 , June 2013 , pp. 1035 - 1039
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012 

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