Relations between shell size and radula size in marine prosobranchs (Mollusca: Gastropoda)

ABSTRACT The Gastropoda presents the highest adaptative radiation among the mollusks. This characteristic allowed the appearance of many forms of feeding, and with it, many strategies of capture and food processing. In this work, specimens belong to 14 marine prosobranch gastropod species were collected in the coast of Ceará State Northeast Brazil with the purpose to investigate the relation between shell size and radula size in gastropods with different diets and radula type. It was found significative correlations in Cerithium atratum, Collisella subrugosa, Fissurella rosea, Neritina virginea, Olivella minuta, Pisania pusio, Tegula viridula, and Thais haemastoma. Nonsignificative results were found in Littorina flava, Littorina ziczac, Nassarius vibex, Natica marochiensis, Pleuroploca aurantiaca, and Pugilina morio. The species with rhipidoglossate radula and the driller carnivores with rachiglossate radula are the ones that presented significative correlation among shell size and radula size. Other parameters that could influence the radular morphology (besides the radula type or diet) are environment pressure, prey searching and capture strategies and species ontogeny. RESUMO A classe Gastropoda é o grupo que possui a maior radiação adaptativa entre os moluscos. Essa característica permitiu o surgimento de várias formas de alimentação e, com elas, diversas estratégias de captura e processamento do alimento. Neste trabalho, 14 espécies de gastrópodes prosobrânquios marinhos foram coletados no litoral do Estado do Ceará nordeste do Brasil, com o objetivo de analisar a relação entre o tamanho da concha e o tamanho da rádula em animais com diferentes dietas e tipos radulares. O teste revelou correlações significativas em Cerithium atratum, Collisella subrugosa, Fissurella rosea, Neritina virginea, Olivella minuta, Pisania pusio, Tegula viridula e Thais haemastoma. Resultados não significativos forma encontrados em Littorina flava, Littorina ziczac, Nassarius vibex, Natica marochiensis, Pleuroploca aurantiaca e Pugilina morio. As espécies com rádula rhipidoglossa e os carnívoros perfuradores com rádula rachiglossa apresentaram correlação significativa na relação estudada. Outros parâmetros que podem influenciar na morfologia radular (além do tipo de rádula e dieta,) são a pressão do meio, as estratégias de procura e captura da presa e a ontogenia das espécies

Evidence confirms an anthropic origin of Amazonian Dark Earths

Archaeology of the America

An Extended Geographical Distribution Of Donax Gemmula Morrison, 1971 (bivalvia: Donacidae): New Record From The Brazilian Northeastern Coast

This study provides the first record of Donax gemmula Morrison, 1971 (Bivalvia: Donacidae) from the Ceará State, Northeast Brazil; up to now it was only known from the Southeastern and Southern Brazilian coast. Shells larger than ~2 mm in length of this species can be distinguished from those of D. striatus Linnaeus, 1767. Both species were collected in the same beaches: Banco dos Cajuais and Pecém. The occurrence of D. gemmula remains unnoticed for others States of the Northeast Brazil, and so we suggest two possible explanations for this finding from Ceará State: i) a recent introduction (e.g., by ballast water); or ii) this species has a continuous distribution along the Brazilian coast (Ceará to Rio Grande do Sul), being not recorded until now because this is not easily collected (the animals are small and bottom samples need to be sieved to obtain them) and may be confused with young specimens of other species of Donax, such as D. striatus. © 2013 Check List and Authors.9510871090Alves, E.S., Pezzuto, P.R., Effect of cold fronts on the benthic macrofauna of exposed sandy beaches with contrasting morphodynamics (2009) Brazilian Journal of Oceanography, 57 (2), pp. 73-96Alves, E.S., Pezzuto, P.R., Effect of morphodynamics on annual average zonation pattern of benthic macrofauna of exposed sandy beaches in Santa Catarina, Brazil (2009) Brazilian Journal of Oceanography, 57 (3), pp. 189-203Amaral, A.C.Z., Jablonski, S., Conservation of marine and coastal biodiversity in Brazil (2005) Conservation Biology, 19 (3), pp. 625-631Ansell, A.D., The biology of the genus Donax (1983) Sandy beaches as Ecosystems., pp. 607-635. , In A. McLachlan and T. Erasmus (ed.). BostonJunk, W., Arruda, E.P., Amaral, A.C.Z., Spatial distribution of mollusks in the intertidal zone of sheltered beaches in southeastern of Brazil (2003) Revista Brasileira de Zoologia, 20 (2), pp. 291-300. , PublishersBarros, F., Borzone, C.A., Rosso, S., Macroinfauna of six beaches near Guaratuba Bay, Southern Brazil (2001) Brazilian Archives of Biology and Technology, 44 (4), pp. 351-364Borzone, C.A., Souza, J.R.B., Soares, A.G., Morphodynamic influence on the structure of inter and subtidal macrofaunal communities of subtropical sandy beaches (1996) Revista Chilena de Historia Natural, 69, pp. 565-577Campos, A.A., Polette, M., A gestão integrada da Zona Costeira (2003) A Zona Costeira do Ceará: Diagnóstico para a Gestão Integrada., pp. 11-26. , In AQUASIS-Associação de Pesquisa e Preservação de Ecossistemas Aquáticos (org). Fortaleza: AquasisCarlos, C.J., Fedrizzi, C.E., Campos, A.A., Matthews-Cascon, H., Barroso, C.X., Rabay, S.G., Bezerra, L.E.A., Thiers, P.R.L., (2010) Migratory Shorebird Conservation and Shrimp Farming in NE Brazil-Final Report., p. 162Cochôa, A.R., Lorenzi, L., Borzone, C.A., A influência da passagem de uma frente meteorológica na distribuição da macrofauna bentônica mesolitoral de uma praia arenosa exposta (2006) Tropical Oceanography, 34 (2), pp. 59-71Corbisier, T.N., Benthic macrofauna of sandy intertidal zone at Santos estuarine system, São Paulo, Brazil (1991) Boletim do Instituto Oceanográfico de São Paulo, 39 (1), pp. 1-13Denadai, M.R., Amaral, A.C.Z., Turra, A., Structure of molluscan assemblages in sheltered intertidal unconsolidated environments (2005) Brazilian Archives of Biology and Technology, 48 (5), pp. 825-839Domaneschi, O., Lopes, S.G.B.C., Família Donacidae Fleming, 1828 (1988) Informativo da Sociedade Brasileira de Malacologia, 87, pp. 9-12. , 1889 88: 9-1292: 9-1293: 9-12Morrison, J.P.E., Western Atlantic Donax (1971) Proceedings of the Biological Society of Washington, 83 (48), pp. 545-568Neves, F.M., Bemvenuti, C.E., Variabilidade diária da zonação da macrofauna bentônica em praias arenosas do litoral norte do Rio Grande do Sul (2009) Iheringia Série Zoologia, 99 (1), pp. 71-81Neves, F.M., Colling, L.A., de Pereira, P.S., Bemvenuti, C.E., Daily variation of macrobenthic fauna on an exposed sandy beach of Rio Grande do Sul, Brazil (2006) Journal of Coastal Research, 39, pp. 1225-1228Neves, L.P., da Silva, P.S.R., Bemvenuti, C.E., Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil (2008) Iheringia Série Zoológica, 98 (1), pp. 36-44Neves, L.P., da Silva, P.S.R., Bemvenuti, C.E., Distribuição horizontal da macrofauna bentônica na praia do Cassino, extremo sul do Brasil (2012) Iheringia Série Zoologia, 102 (3), pp. 245-253Ourives, T.M., Rizzo, A.E., Boehs, G., Composition and spatial distribution of the benthic macrofauna in the Cachoeira River estuary, Ilhéus, Bahia, Brazil (2011) Revista de Biología Marina y Oceanografía, 46 (1), pp. 17-25Pagliosa, P.R., Distribuição da macrofauna bêntica do entremarés ao sublitoral em uma praia estuarina da Baía da Babitonga, Sul do Brasil (2006) Biotemas, 19 (1), pp. 25-33Passos, F.D., Domaneschi, O., Biologia e anatomia funcional de Donax gemmula Morrison (Bivalvia, Donacidae) do litoral de São Paulo, Brasil (2004) Revista Brasileira de Zoologia, 21 (4), pp. 1017-1032Silva, J.S.V., Fernandes, F.C., Souza, R.C.C.L., Larsen, K.T.S., Danelon, O.M., (2004) Água de lastro e bioinvasão, pp. 1-10. , In J. S. V. Silva and R. C. C. L. Souza (org.). Água de Lastro e Bioinvasão. Rio de Janeiro: Interciênciasde Silva, P.S.R., Neves, L.P., Bemvenuti, C.E., Temporal variation of sandy beach macrofauna at two sites with distinct environmental conditions on Cassino Beach, extreme southern Brazil (2008) Brazilian Journal of Oceanography, 56 (4), pp. 257-270Smith, A.J., Morais, J.O., Estudos preliminares sobre a geologia ambiental costeira do estado do Ceará, nordeste do Brasil (1984) Arquivos de Ciências do Mar, 23 (1), pp. 85-96Souza, J.R.B., Gianuca, N.M., Zonation and seasonal variation of the intertidal macrofauna on a sand beach of Paraná State, Brazil (1995) Scientia Marina, 59 (2), pp. 103-11