Influência do substrato sobre o crescimento de Subulina octona (Brugüière) (Mollusca, Subulinidae), sob condições de laboratório

D’ávila, Sthefane; Bessa, Elisabeth Cristina de Almeida

doi:10.1590/s0101-81752005000100025

Cited by 19 publications

(10 citation statements)

References 16 publications

(8 reference statements)

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“…The life history of these species is characterized by indeterminate growth, ovoviviparity and the release of calcified eggs (Dundee 1986; D’ávila and Bessa 2005a, b). Although L. unilamellata is also an ovoviviparous species with indeterminate growth, this species releases juveniles instead of eggs and present a more voluminous oviduct, compared to the other species.…”

Section: Discussionmentioning

confidence: 99%

Ontogeny and morphological variability of shell in populations of Leptinaria unilamellata (d’Orbigny, 1835) (Mollusca, Pulmonata, Subulinidae)

Medeiros¹,

Caldeira²,

Mendonça³

et al. 2015

SpringerPlus

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BackgroundRecent studies concerning species of land snails have revealed that the shell morphometrics can provide evidence of the differentiation among populations. In many cases, the morphologic analysis combined with the investigation of molecular variability, can support changes in taxonomy of studied groups. In this sense, the study of shell morphometry during snail development can contribute to the understanding of the structural mechanisms that creates the diversity observed.DescriptionThe morphological and ontogenetic pattern differences were collected among snails from four different populations, kept under the same laboratorial conditions. It was possible to distinguish characteristic shell morphometrics for snails from each population. The snails from Barra Mansa and Floriano, locations with smaller precipitation indexes presented smaller shell aperture values. The results are discussed in terms of the role of the reproductive strategy of this species as a factor determining shell shape.ConclusionsDifferences in growth allometry indicated that the whole shell forming process is different among the populations, not only the final form of the adult’s shell. Some allometry relationships indicated that, during the snails’ development, the increase in shell width is not proportional to the increase of the width and height of the shell aperture. Thus, there is possibly an antagonism between the adoption of K-strategy and protection against desiccation. Since the spire indices of L. unilamellata morphotypes cannot be explained by physical functional aspects, the most likely explanation is the reproductive strategy of this species.

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Section: Discussionmentioning

confidence: 99%

Ontogeny and morphological variability of shell in populations of Leptinaria unilamellata (d’Orbigny, 1835) (Mollusca, Pulmonata, Subulinidae)

Medeiros¹,

Caldeira²,

Mendonça³

et al. 2015

SpringerPlus

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“…For this species, there was a high correlation between body size and fecundity. Body weight, shell length and egg production are all correlated in land snails Subulina octona (Brugüière, 1789) (D'Ávila & Bessa 2005) and B. tenuissimus (Silva et al 2008), which suggests that H. semenlini gain reproductive success by breeding when they have reached a larger size.…”

Section: Discussionmentioning

confidence: 99%

Life history of the land snail Habroconus semenlini (Stylommatophora: Euconulidae) under laboratory conditions

Silva¹,

Meireles²,

Vargas³

et al. 2009

RBT

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Habroconus semenlini is a micro-terrestrial gastropod native to South America. There are no previous studies on its biology. We studied its pattern of growth, fertility and lifespan under laboratory conditions. For this purpose, 80 snails were either grouped or kept isolated (40 animals in each condition) during their lifetime. Growth is indeterminate and the species is capable of self-fertilization with high reproductive success. Grouped snails had lower fecundity than the animals that were kept in isolation. This species has a short lifespan and only one reproductive period, which characterizes the occurrence of semelparity.

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“…Peake (1978) suggested that the nutritional content in individual eggs may be an important factor determining future growth patterns in pulmonates. Several works have also demonstrated that increased size is related to increased fecundity in many animals, including mollusks (Stearns & Koella 1986, Heller 2001, D'Ávila & Bessa 2005. Considering that isolated individuals were larger and produced more eggs per egg mass, further studies might investigate the relation between size and fecundity in O. matheroni.…”

Section: Discussionmentioning

confidence: 94%

Reproduction of <i>Omalonyx matheroni</i> (Gastropoda: Succineidae) under laboratory conditions

Montresor

Teixeira

Paglia

et al. 2012

RBT

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Abstract:The life histories of succineids have received relatively little attention. To evaluate life history characteristics of Omalonyx matheroni, we studied a Brazilian population (Reserva Particular do Patrimônio Natural Feliciano Miguel Abdala, in Caratinga, Minas Gerais, Brazil) under laboratory conditions. The aims of the present study were (1) to describe in detail an appropriate rearing method; (2) to investigate the effects of different temperature and photoperiod conditions; and (3) to assess the effects of self and cross-fertilization on the reproductive biology of these mollusks. We studied the oviposition site, the time to sexual maturity and the influences of photoperiod and temperature on reproductive parameters of O. matheroni reared under laboratory conditions. We tested three combinations of temperature and photoperiod, designated A, B and C (A: 25ºC, 24 hours of light; B: environmental conditions of temperature and photoperiod, characterized as follows: average maximum temperature=27.1ºC, average minimum temperature=18.3ºC, average day length=12.06 hours; and C: 25ºC, zero hours of light) and two rearing densities (I: isolated and G: grouped) on reproductive parameters (number of eggs per egg mass, number of unviable eggs per mass, egg mass incubation period, and duration of the hatching period). A total of 186 individuals and 565 egg masses were studied. Data were analyzed by Student's t-test, two-way ANOVA and Chi-Square test. Eight generations were produced (March/2004-March/2006), from 35 field specimens, 91% of 3 197 eggs hatched. The time to sexual maturity was approximately three months for individuals reared in groups or in isolation (Student's t-test: t=1.41, df=31, p=0.16); however, they differed significantly in weight (Student's t-test: t=3.6, df=31, p<0.001). Regarding the influences of temperature and photoperiod on reproductive parameters, under natural environmental conditions, individuals produced a greater number of eggs per mass (ANOVA: F 2,573 =84.15, p<0.001), with a longer incubation period (ANOVA: F 2;559 =170.05, p<0.001). The extreme photoperiod conditions of 24 hours of light or zero hours of light likely imposed stress and could be related to the significant reductions in the number of eggs per mass, and egg incubation period as well as the increased synchrony in egg hatching. No correlations were observed between the number of unviable eggs per mass and the temperature, photoperiod (ANOVA: F 2,573 =0.87, p=0.92) or rearing density (ANOVA: F 1,573 =0.21, p=0.64). Individuals reared in isolation under natural conditions produced more eggs per mass and did not presented any disadvantage with respect to the variables analyzed as compared to the animals reared in groups. These results indicate that O. matheroni can successfully reproduce by selfing. Rev. Biol. Trop. 60 (2): 553-566. Epub 2012 June 01.

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Influência do substrato sobre o crescimento de Subulina octona (Brugüière) (Mollusca, Subulinidae), sob condições de laboratório

Cited by 19 publications

References 16 publications

Ontogeny and morphological variability of shell in populations of Leptinaria unilamellata (d’Orbigny, 1835) (Mollusca, Pulmonata, Subulinidae)

Ontogeny and morphological variability of shell in populations of Leptinaria unilamellata (d’Orbigny, 1835) (Mollusca, Pulmonata, Subulinidae)

Life history of the land snail Habroconus semenlini (Stylommatophora: Euconulidae) under laboratory conditions

Reproduction of <i>Omalonyx matheroni</i> (Gastropoda: Succineidae) under laboratory conditions

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