caa a22 4500 445893338 CHVBK 20180317145623.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10750-011-0788-z doi (NATIONALLICENCE)springer-10.1007/s10750-011-0788-z Lack of early laboratory postzygotic reproductive isolation between two ecotypes of Littorina saxatilis (Mollusca, Gastropoda) showing strong premating sexual isolation [Elektronische Daten] [M. Saura, M. Martínez-Fernández, M. Rivas, A. Caballero, E. Rolán-Alvarez] Two sympatric and divergent adaptive ecotypes of Littorina saxatilis (RB and SU) are known to hybridize showing partial premating isolation in the wild. Previous studies have revealed that morphological intermediate forms (presumably hybrids) present fitness (viability, sexual selection and fecundity) similar to that from pure ecotypes at the mid-shore. However, the absence of postzygotic isolation due to genetic incompatibility cannot be ruled out unless it is measured directly on true F 1 hybrids. In this study, we overcome this problem and present data on 56 individual crosses including the four possible mating combinations (RB/RB, RB/SU, SU/RB and SU/SU) to compare fertilization and fecundity rates (including young progeny viability) between the four type crosses. Pooled RB female crosses showed apparently larger fertility and fecundity than pooled SU female crosses, probably because of differences in fecundity and laboratory survivorship between ecotypes. However, similar fertilization and fecundity rates were found for both RB and SU females when mated with different male types, supporting the idea that genetic-incompatibility-based postzygotic isolation can be ignored as a major determinant of this polymorphism in nature. Springer Science+Business Media B.V., 2011 Ecological speciation nationallicence Fecundity nationallicence Fertility nationallicence Laboratory culture nationallicence Postmating isolation nationallicence Premating isolation nationallicence Saura M. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut Martínez-Fernández M. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut Rivas M. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut Caballero A. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut Rolán-Alvarez E. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut Hydrobiologia Springer Netherlands 675/1(2011-10-01), 13-18 0018-8158 675:1<13 2011 675 10750 https://doi.org/10.1007/s10750-011-0788-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0788-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Saura M. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut NATIONALLICENCE 700 1- Martínez-Fernández M. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut NATIONALLICENCE 700 1- Rivas M. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut NATIONALLICENCE 700 1- Caballero A. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut NATIONALLICENCE 700 1- Rolán-Alvarez E. Departamento de Bioquímica, Xenética e Inmunoloxía, Facultade de Bioloxía, Universidade de Vigo, 36310, Vigo, Spain aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 675/1(2011-10-01), 13-18 0018-8158 675:1<13 2011 675 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer