The population density effects on the reproductive biology of the snail Bradybaena similaris (Férussac, 1821) (Mollusca, Gastropoda)

Oliveira, Cs. de; Vasconcellos, Mc.; Pinheiro, Jairo

doi:10.1590/s1519-69842008000200018

Cited by 7 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…2A). This is in accordance with the findings of Oliveira et al, who observed the lowest number of eggs/snail (Bradybeana similaris) at the lowest density [9] but had no explanation for this phenomenon. Ristola et al [26] investigated the influence of both feeding level and larval density on growth and development in the midge Chironomus riparius.…”

Section: Snail Density Significantly Affects Reproductionsupporting

confidence: 92%

“…A later study by Forbes et al [8] detected no effects on reproduction at a test temperature of 25 • C. Density might also effect reproduction in molluscs: Hatching of the Asian trampsnail Bradybaena similaris starts at day 21 when adults are kept at a low density and up to 15 days later at a higher adult density. [9] Consequently, insufficient standardization may lead to variations of the effect response and reduce reproducibility of results. In the framework of the current UBA project, our aim is to investigate breeding and test conditions in the laboratory and to refine the current method protocol.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of test media on reproduction inPotamopyrgus antipodarumand of pre-exposure population densities on sensitivity to cadmium in a reproduction test

Sieratowicz

Schulte‐Oehlmann

Wigh

et al. 2013

Journal of Environmental Science and Health, Part A

View full text Add to dashboard Cite

Molluscan species can be affected by various anthropogenic substances. Yet, these effects are disregarded in chemical risk assessment as molluscs are unrepresented in standard OECD guidelines. The project "validation of a mollusc reproduction test" (Federal Environment Agency, code 371165417) deals with the development of a test method with the mudsnail Potamopyrgus antipodarum for OECD purposes. In this context, the influence on reproduction of both, different media and varying snail density, has been observed in independent experiments. Further, the impact of density on the outcome of subsequent cadmium (Cd) toxicity in a test has been investigated to refine the existing methodology. First, adult snails were kept in different test media for 12 weeks. Second, snail density was increased for 4 weeks to induce stress. Snails from each density scenario were used for another 4 weeks in a reproduction test at an equal density with 12 μg Cd/L, respectively. Significant differences in reproduction between medium groups were noted after 4 and 8, but not 12, weeks. Further, reproduction was significantly altered by snail density in the beakers but after subsequent 4 weeks at a constant density, no differences were observed between control groups. Cd reduced reproduction and this effect increased with snail density in the pre-exposure period, demonstrating that a previous stress factor may result in increased sensitivity to chemicals and underlines the need for more standardized breeding conditions to minimize effect variations. Based on the outcome of this study, an acclimatization period of 12 weeks must be guaranteed for specimens transferred to another medium. Further, 4 weeks of acclimatization are necessary after density stress. An additional 12 weeks density experiment showed that medium volume in each replicate can be decreased by half to save on chemicals, water and space during tests.

show abstract

Section: Snail Density Significantly Affects Reproductionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effects of test media on reproduction inPotamopyrgus antipodarumand of pre-exposure population densities on sensitivity to cadmium in a reproduction test

Sieratowicz

Schulte‐Oehlmann

Wigh

et al. 2013

Journal of Environmental Science and Health, Part A

View full text Add to dashboard Cite

show abstract

“…However, this divergent result could have been due to the use of different doses of miracidia, because Sluiters et al (1980) and Sluiters (1981) found a negative correlation between the number of eggs laid and the miracidial dose. Besides this, the influence of various environmental factors must be considered, such as food availability, photoperiod and population density (Sandland and Minchella, 2003;Gomot, 1990;Oliveira et al, 2008;Lustrino et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Changes in the reproductive biology of Biomphalara glabrata infected with different doses of Echinostoma paraensei miracidia

Tunholi¹,

Lustrino²,

Tunholi-Alves³

et al. 2011

Journal of Invertebrate Pathology

View full text Add to dashboard Cite

The egg-laying rate, number of egg masses, number of eggs/mass, number of eggs hatched/snail and egg viability of Biomphalaria glabrata exposed to different doses (5 and 50) of Echinostoma paraensei miracidia were analyzed as indicators of reproductive activity. Polystyrene plates were placed in aquariums containing the snails and every other day for four weeks after infection the plates were removed to count the number of egg masses and eggs laid. After this, the plates were numbered individually and placed in new aquariums free of snails and the egg masses were observed daily to determine the hatching rate. On average there was an increase in the parameters evaluated in the infected snails in relation to the controls (uninfected snails), except for egg viability, which was significantly lower in the groups infected with 50 miracidia. These findings indicate that when infected, this host snail is able to increase its reproductive activity, suggesting an ecological strategy to maintain the species.

show abstract

“…The decrease in the total protein contents in the hemolymph of parasitized snails suggests the use the carbon structures obtained from gluconeogenic amino acids, because as mentioned earlier, changes in the metabolism of carbohydrates have been observed in snails under physiological stress, especially caused by infection by trematode larvae (Pinheiro and Amato 1994;Lustrino et al 2008;Oliveira et al 2008). In addition, the decrease in Fig.…”

Section: Discussionmentioning

confidence: 85%

Biochemical profile of Biomphalaria glabrata (Mollusca: Gastropoda) after infection by Echinostoma paraensei (Trematoda: Echinostomatidae)

Tunholi¹,

Lustrino²,

Tunholi-Alves³

et al. 2011

Parasitol Res

View full text Add to dashboard Cite

The effect of infection by Echinostoma paraensei on the activity of the enzymes alanine aminotransferase (ALT) and aspartate aminotransferase (AST) and the concentration of total proteins, uric acid and urea in the hemolymph of Biomphalaria glabrata were investigated after exposure to five or 50 miracidia. The biochemical concentrations were measured weekly until the end of the fourth week after exposure. There was a significant decrease in the concentrations of total proteins in the snails exposed both to five and 50 miracidia, as well as an increase in the nitrogenous products of excretion, ALT and AST activities. The higher ALT activity in the hemolymph of the snails after infection with 50 miracidia suggests highest energetic requirement in these snails in relation to snails exposed to five miracidia. The results also suggest an increase in the use of total proteins, since there was increased formation of nitrogenous catabolites, in conformity with an increase in the aminotransferase activities, frequently associated with tissue damages. This can be explained by damage due to penetration by the miracidia and subsequent development of intramolluscan sporocysts and rediae.

show abstract

The population density effects on the reproductive biology of the snail Bradybaena similaris (Férussac, 1821) (Mollusca, Gastropoda)

Cited by 7 publications

References 6 publications

Effects of test media on reproduction inPotamopyrgus antipodarumand of pre-exposure population densities on sensitivity to cadmium in a reproduction test

Effects of test media on reproduction inPotamopyrgus antipodarumand of pre-exposure population densities on sensitivity to cadmium in a reproduction test

Changes in the reproductive biology of Biomphalara glabrata infected with different doses of Echinostoma paraensei miracidia

Biochemical profile of Biomphalaria glabrata (Mollusca: Gastropoda) after infection by Echinostoma paraensei (Trematoda: Echinostomatidae)

Contact Info

Product

Resources

About