Influence of egg cannibalism on growth, survival and feeding in hatchlings of the land snail Helix aspersa Müller (gastropoda, pulmonata, stylommatophora)

Desbuquois, Christophe

doi:10.1051/rnd:19970206

Cited by 13 publications

(8 citation statements)

References 17 publications

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“…If growth and individual variations are considered to be good indicators of animal welfare (Brambell 1970), the system of management described in this study is acceptable. The animals showed high growth rates, low individual variation and a normal weight distribution, in contrast to the findings of others (Sanz Sampelayo et al 1990, Fontanillas 1995, Desbuquois 1997, Roberson & Moorhead 1999a. The average mortality rate was 9%, which is substantially lower than the 30% obtained by Desbuquois (1997) and Daguzan (1981), and the 20% observed by Jess and Marks (1995).…”

Section: Discussioncontrasting

confidence: 81%

“…The animals showed high growth rates, low individual variation and a normal weight distribution, in contrast to the findings of others (Sanz Sampelayo et al 1990, Fontanillas 1995, Desbuquois 1997, Roberson & Moorhead 1999a. The average mortality rate was 9%, which is substantially lower than the 30% obtained by Desbuquois (1997) and Daguzan (1981), and the 20% observed by Jess and Marks (1995). We also found a consistent positive relationship between weight and age under laboratory conditions, and a high correlation index (R 2 >90%).…”

Section: Discussioncontrasting

confidence: 81%

“…We also found a consistent positive relationship between weight and age under laboratory conditions, and a high correlation index (R 2 >90%). Sanz Sampelayo et al (1990) and Roberson and Moorhead (1999a) maintained constant temperature and relative humidity throughout the experiment, with a photoperiod of 12 h, while Desbuquois (1997) housed snails under a photoperiod of 16 h. In the present study, boxes were cleaned regularly between days 2 and 15. Furthermore, the animals came from a homogeneous sample with a low individual variation in initial body weight, whereas several of the previous studies included animals from the same clutch that were not selected according to size.…”

Section: Discussionmentioning

confidence: 99%

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Laboratory rearing conditions for improved growth of juvenile Helix aspersa Müller snails

et al. 2006

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A laboratory rearing system in semi-controlled conditions is proposed to facilitate the behavioural rhythms of the edible snail (Helix aspersa) and to produce a high growth rate with low variability. The growth data were used to construct a model for weight estimation based on age. The animals' live weights showed low variability (<17%) and normal distribution. The best model for estimating weight from age is the logistic model, with a high corelation coefficient (>90%), and a high level of significance for the coefficient (P < 0.0001).

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Section: Discussioncontrasting

confidence: 81%

Section: Discussioncontrasting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

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Laboratory rearing conditions for improved growth of juvenile Helix aspersa Müller snails

et al. 2006

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“…This initial ingestion of calcium ensures that the snail has sufficient material to strengthen the shell after hatching and thereafter they rely on their food supply and a calcium rich soil for further calcium. Hatching asynchrony within a clutch may prompt egg cannibalism by early hatchlings (Baur 1994, Desbuquois 1997) and the production of unfertilized nurse or trophic eggs provides an additional source of calcium (Baur 1994). Egg cannibalism improves the survival prospects of Helix hatching (Desbuquois 1997) and the production of nurse eggs anticipates egg cannibalism, perhaps to supply calcium to hatchlings from eggs whose calcium concentration cannot be raised much above 10% (Beeby and Richmond 2001).…”

Section: Discussionmentioning

confidence: 99%

Effects of dietary calcium on growth and oviposition of the African land snail Limicolaria flammea (Pulmonata: Achatinidae)

Egonmwan¹

2006

RBT

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In an attempt to elucidate the role of calcium in the life of the edible Achatinid snail, Limicolaria flammea (Müller) I investigated short and long term effects of calcium added to the food. The short term experiments lasted for 18, 30 and 32 weeks respectively, while the long term experiment to determine life time utilization of calcium carbonate lasted for 15 months. In the short term experiments, hatchlings were divided into densities of one, ten and 50 snails. In the 10 snail group, there was a positive correlation between calcium provision, body weight (t test, p < 0.01; r = 0.96, p < 0.0001) and shell length (t test, p < 0.01; r = 0.96, p < 0.00001). There was also a positive correlation between increase in shell length and availability of calcium in the 1 snail group (t test, p< 0.01; r = 0.99, p < 0.00001). In the 50-snail group, the correlation was positive for shell length of the snails (t test, p < 0.05; r = 0.99, p < 0.0001) and body weight (t-test, p < 0.05; r = 99, p < 0.00001). Mortality was very high in the snails deprived of calcium and they did not produce eggs. In the long term experiment, there were three feeding peaks in L. flammea. In the first feeding peak, amount of food and calcium ingested by the snails increased in the first three months of life. The second feeding peak occurred at six months of age, while the last occurred at 10 months of age. The amount of calcium ingested during the second peak decreased gradually in the 4th and 5 th month. The amount of calcium ingested was lowest during the 3rd feeding peak. The period of highest weight gained by the snails was between the 1st and 6th month and then dropped at between six and 12 months of age which corresponds to the period of egg production. There were also three peaks of egg production; the first was between six and eight months (535 eggs), the second at between 10 and 11 months (350 eggs) and the third at 13 to 14 months (310 eggs) respectively. Rev. Biol. Trop. 56 (1): 333-343. Epub 2008 March 31.

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“…neonates get a faster start in growth by eating their egg shells and the egg shells and albumen of unhatched dead eggs in the nest (TOMPA 1984, BAUR & BAUR 1986, BAUR 1990, DESBUQUOIS 1997, DESBUQUOIS & MADEC 1998.…”

Section: Resumo Micrmentioning

confidence: 99%

Light and electron microscopy study of late embryonic development in the land snail Limicolaria flammea (Müller) (Pulmonata, Achatinidae)

Egonmwan

2007

Rev. Bras. Zool.

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The late stages of embryogenesis in the achatinid land snail Limicolariaflammea (Müller, 1774) were described using light and electron microscopy. Embryos at various stages of development were present in the eggs during the first hour after they were laid, from 4-cell blastulae to morulae and fairly advanced stages. The advanced embryo which was fully developed on the second day bears a long cephalic sac, first to be developed, attached to the embryo and a podocyst which is attached to the foot of the embryo. Both of these structures are reduced in size as embryogenesis progresses until they finally disappear at about the 7th day after the egg was deposited. The embryonic shell was apparent on the second day and spiral coiling was apparent at about day 5. The spiral shell had one whorl when formed and more spirals were added so that at hatching the young snails had three whorls.

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Influence of egg cannibalism on growth, survival and feeding in hatchlings of the land snail Helix aspersa Müller (gastropoda, pulmonata, stylommatophora)

Cited by 13 publications

References 17 publications

Laboratory rearing conditions for improved growth of juvenile Helix aspersa Müller snails

Laboratory rearing conditions for improved growth of juvenile Helix aspersa Müller snails

Effects of dietary calcium on growth and oviposition of the African land snail Limicolaria flammea (Pulmonata: Achatinidae)

Light and electron microscopy study of late embryonic development in the land snail Limicolaria flammea (Müller) (Pulmonata, Achatinidae)

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