The Influence of Self-fertilization performance and Copulation Behaviour in Reproduction by Cross-fertilization in Groups of Biomphalaria tenagophila (Mollusca, Planorbidae)

Freitas, June Springer de; Paula, Danielli Parrilha de; Cariello, Mariana O.

doi:10.1590/s0074-02761997000600003

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…The assay water was renewed twice a week and snails were fed with fresh lettuce leaves cultivated without using pesticides (a piece of approximately 1 cm 2 ) plus 1 mg of a laboratory-made chow per snail. The chow was prepared as described by Freitas et al (1997). To recover egg masses laid by snails, glasses were internally covered with cellophane sheets.…”

Section: Effects On the Fecundity Of The Parental Generation (F 0 )mentioning

confidence: 99%

Trans-generation study of the effects of nonylphenol ethoxylate on the reproduction of the snail Biomphalaria tenagophila

Oliveira-Filho

Grisólia

Paumgartten

2009

Ecotoxicology and Environmental Safety

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Nonylphenols ethoxylates (NPEs) are surfactants used in a variety of products. They are found in domestic sewage, industrial effluents and as contaminants in water bodies. This study was undertaken to evaluate the effects of NPE with 9.5 ethoxylate units (NPE9.5; 0, 0.01, 0.1, 1.0 mg/L) on the reproduction of the snail Biomphalaria tenagophila. Adult snails (F0 generation) were exposed to NPE for 8 weeks. The F1 generation continued to be exposed from embryo to reproductive maturity while their descendants (F2) were exposed until day 10 after spawning. We determined the effects of NPE9.5 on the fecundity (8-week production of eggs and egg masses) of mature F0 and F1 snails. Developmental toxicity was investigated in F1 and F2 embryos. The two highest concentrations of NPE9.5 reduced the fecundity of F0. In the F1 generation, the lowest concentration enhanced the number of eggs laid per snail while the intermediate concentration had no effect and the highest one decreased the fecundity thereby suggesting a biphasic effect of NPE9.5. Study-derived NOECs (no-observed-effect-concentrations) for NPE were: fecundity, F0=10 microg/L, F1<10 microg/L; developmental toxicity, F1=100 microg/L, F2<10 microg/L. Results, therefore, indicated that B. tenagophila is highly vulnerable to NPE and that trans-generation exposure to NPE9.5 aggravates its reproductive toxicity.

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Section: Effects On the Fecundity Of The Parental Generation (F 0 )mentioning

confidence: 99%

Trans-generation study of the effects of nonylphenol ethoxylate on the reproduction of the snail Biomphalaria tenagophila

Oliveira-Filho

Grisólia

Paumgartten

2009

Ecotoxicology and Environmental Safety

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“…In such a chain, the frontmost individual acts only as a female, the last individual only as a male, and each individual in between acts as male to the partner directly in front of it and female to the partner directly in its back. In a few species simultaneously reciprocal matings may occasionally take place (reviewed in Jordaens et al, 2007 [ Biomphalaria glabrata : Brumpt, 1941; Vernon and Taylor, 1996; Trigwell et al, 1997; Vianey-Liaud, 1998; B. tenogophila : Springer de Freitas et al, 1997; Helisoma trivolvis : Duncan, 1975]). In a standard unilateral copulation, the sperm recipient seems to be more or less inactive when mounted by a partner.…”

Section: Introductionmentioning

confidence: 99%

Neuro-endocrine control of reproduction in hermaphroditic freshwater snails: mechanisms and evolution

Koene

2010

Front. Behav. Neurosci.

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Invertebrates are used extensively as model species to investigate neuro-endocrine processes regulating behaviors, and many of these processes may be extrapolated to vertebrates. However, when it comes to reproductive processes, many of these model species differ notably in their mode of reproduction. A point in case are simultaneously hermaphroditic molluscs. In this review I aim to achieve two things. On the one hand, I provide a comprehensive overview of the neuro-endocrine control of male and female reproductive processes in freshwater snails. Even though the focus will necessarily be on Lymnaea stagnalis, since this is the best-studied species in this respect, extensions to other species are made wherever possible. On the other hand, I will place these findings in the actual context of the whole animal, after all these are simultaneous hermaphrodites. By considering the hermaphroditic situation, I uncover a numbers of possible links between the regulation of the two reproductive systems that are present within this animal, and suggest a few possible mechanisms via which this animal can effectively switch between the two sexual roles in the flexible way that it does. Evidently, this opens up a number of new research questions and areas that explicitly integrate knowledge about behavioral decisions (e.g., mating, insemination, egg laying) and sexual selection processes (e.g., mate choice, sperm allocation) with the actual underlying neuronal and endocrine mechanisms required for these processes to act and function effectively.

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Effects of endosulfan and ethanol on the reproduction of the snail Biomphalaria tenagophila: A multigeneration study

2009

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The Influence of Self-fertilization performance and Copulation Behaviour in Reproduction by Cross-fertilization in Groups of Biomphalaria tenagophila (Mollusca, Planorbidae)

Abstract: The following hypotheses were tested for groups of simultaneous hermaphrodites Biomphalaria tenagophila: (a)

Cited by 8 publications

References 6 publications

Trans-generation study of the effects of nonylphenol ethoxylate on the reproduction of the snail Biomphalaria tenagophila

Trans-generation study of the effects of nonylphenol ethoxylate on the reproduction of the snail Biomphalaria tenagophila

Neuro-endocrine control of reproduction in hermaphroditic freshwater snails: mechanisms and evolution

Effects of endosulfan and ethanol on the reproduction of the snail Biomphalaria tenagophila: A multigeneration study

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