Título:	The Influence of Self-fertilization performance and Copulation Behaviour in Reproduction by Cross-fertilization in Groups of Biomphalaria tenagophila (Mollusca, Planorbidae)
Autor(es):	Freitas, June Springer de Paula, Débora Pires de Cariello, Mariana Otero
Assunto:	Biomphalaria Reprodução animal
Data de publicação:	Dez-1997
Editora:	Instituto Oswaldo Cruz, Ministério da Saúde
Referência:	FREITAS, June Springer de; PAULA, Débora Pires; CARIELLO, Mariana Otero. The influence of self-fertilization performance and copulation behaviour in reproduction by cross-fertilization in groups of biomphalaria tenagophila (Mollusca, Planorbidae). Memórias do Instituto Oswaldo Cruz, v. 92, n. 6, p. 739-743, nov./dez. 1997. DOI: https://doi.org/10.1590/S0074-02761997000600003. Disponível em: https://www.scielo.br/j/mioc/a/M8pTRLB9zCLNdjDPctZmP7n/?lang=en#. Acesso em: 10 nov. 2021.
Abstract:	The following hypotheses were tested for groups of simultaneous hermaphrodites Biomphalaria tenagophila: (a) snails that have low reproductive success during the process of self-fertilization do not increase their reproductive success after the end of grouping; (b) the copulation behaviour and the presence of one snail whose eggs have a low viability rate influence the partner's reproductive success by cross-fertilization. Groups were constituted by a homozygous pigmented snail and two albinos: one with a viability rate higher than 70% ("good reproducers") and the other less than 10% ("bad reproducers"). All pigmented snails had viability rates higher than 70%. The "good" and "bad" reproducer albino snails had similar copulation behaviour. However, after the end of grouping, the "bad reproducers" continued to have viability rates less than 10% over 30 days. In 100% of the cases that pigmented snails copulated (performing either a male role or simultaneously male and female roles) exclusively with "good" reproducer albinos, they presented high reproductive success (producing, on average of 8.4 pigmented embryos/egg-mass). However, in 100% of the cases that pigmented snails copulated with both partners, the "good" reproducer albino snails produced none or very few embryos (the highest average was 2.2 pigmented embryos/egg-mass). Therefore, the production of viable embryos by cross-fertilization was more influenced by self-fertilization performance than by copulation behaviour. The presence of a snail whose eggs have a low viability rate could decrease their partners reproductive success
Unidade Acadêmica:	Faculdade de Economia, Administração, Contabilidade e Gestão de Políticas Públicas (FACE) Departamento de Economia (FACE ECO)
Licença:	Memórias do Instituto Oswaldo Cruz - This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY NC). Fonte: https://www.scielo.br/j/mioc/a/M8pTRLB9zCLNdjDPctZmP7n/?lang=en#. Acesso em: 10 nov. 2021.
DOI:	https://dx.doi.org/10.1590/S0074-02761997000600003
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