Reproductive characterization of three species of Giant African land snails (GALs) in captivity

Ugwu,; S, O C; Ogbu,; C, C; Ikechiuno,; I, K

doi:10.5897/ajb11.875

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…The two peaks in detectability observed for M. paranaguensis could relate to reproductive activity and oviposition (first peak) and to an increase in pre-aestivation foraging (second peak). The high number of recruitment peaks observed for A. fulica was expected because of the frequency with which the giant African snail mates (Ugwu et al 2011). Achatina fulica lays clutches of up to 400 eggs with an annual production of up to 1200 eggs.…”

Section: Discussionmentioning

confidence: 93%

Population structure of a native and an alien species of snail in an urban area of the Atlantic Rainforest

Miranda

Fontenelle²,

Pecora

2014

Journal of Natural History

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Native Megalobulimus paranaguensis was identified on Brazil's Ilha Porchat promontory, an area that Achatina fulica commonly populates. The population structures of these species were investigated for interactions. Spatial distribution, niche overlap and mark-recapture analysis were conducted. The outer lip of M. paranaguensis and environmental variables were measured. One and two abundance peaks were observed for A. fulica and M. paranaguensis, respectively. Survivorship was higher in A. fulica. Distribution was aggregate for M. paranaguensis, whereas for A. fulica it varied from random to aggregate. Both species aggregate as abundance increases. The lifespan of M. paranaguensis in this location is shorter than its lifespan in a nearby location. Achatina fulica was affected by soil temperature and humidity; M. paranaguensis was influenced by humidity. Niche overlap was random. The results show that M. paranaguensis can keep its natural activity and abundance in the presence of A. fulica, but environmental degradation impacts M. paranaguensis and should be evaluated.

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Section: Discussionmentioning

confidence: 93%

Population structure of a native and an alien species of snail in an urban area of the Atlantic Rainforest

Miranda

Fontenelle²,

Pecora

2014

Journal of Natural History

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“…Characterisation of breed is the first approach to sustainable use of animal genetic resources. Studies on diversity and variability between and within breeds of Giant African Land Snails (GALS) on the basis of quantitative and qualitative variables have become inevitable (Okon et al, 2011;Ugwu et al, 2011;Okon et al, 2012b;Ibom et al, 2012). Information on the egg shell colour of this animal species is not available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Genetic and phenotypic variations in egg shell colour of two ectotypes of Giant African Land Snail (Archachatina marginata var. saturalis)

Ibom¹,

Okon²,

Akpe³

et al. 2017

Afr. J. Biotechnol.

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Data from the snail farm of the University of Calabar, Nigeria were collected and utilized to investigate the distribution and gene frequencies of egg shell colour of two ectotypes of Giant African Land Snails (Archachatina marginata var. saturalis), black skinned (BS) × black skinned mating group, and white skinned (WS) × white skinned mating group. The eggs collected were scored for the presence of yellow (Y p), light yellow (L p) and milky white (M p) egg shell colour. The egg shell colour distributions between the two ectotypes (BS × BS and WS × WS) were 46.50 vs. 3.77%, 42.68 vs. 48.11% and 10.83 vs. 48.11% for yellow, light yellow and milky white, respectively. In both ectotypes, the dominant gene for yellow, light yellow and milky white egg shell colour segregated at low frequencies (0.26 vs. 0.02, 0.24 vs. 0.31 and 0.06 vs. 0.31). The lowest value being yellow shell of the white skinned × white skinned mating group with frequency of 0.02, followed by milky white shell of the black skinned × black skinned mating group with frequency of 0.06. These values were much lower than the Mendelian value of 0.75. This is an indication that snails have not been purified through artificial breeding. Estimate of genetic distance between the two ectotypes were 0.060, 0.005 and 0.063 at yellow, light yellow and milky white loci, respectively. This shows that the ectotypes are closely related at the egg shell colour loci.

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“…Given the low potential for active dispersion in GALS (Takeuchi et al, 1991;Tomiyama, 1992;Albuquerque et al, 2008) and their strong homing instinct, human agents as well as formites (transport vehicles etc) have been the principal agents for the dispersion of GALS (A. marginata, A. fulica, A. achatina) and colonization of distant lands (Takeuchi et al, 1991;Monney, 1994;Gascoigne, 1994;Raut and Barker, 2002;Albuquerque et al, 2008). In a mating test involving species of GALS from rural Nigeria, Ugwu et al (2011) observed the least number of mated pairs (three mated pairs out of eleven pairs tested or 23.1%) for A. marginata. Widely separated snail populations could hence become reproductively isolated.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of pre-mating reproductive isolation in Archachatina marginata from three populations in the humid tropics

Ogbu¹,

C²,

Ugwu³

et al. 2011

Afr. J. Biotechnol.

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Three populations of Archachatina marginata snails (P 1 , P 2 and P 3 ) obtained from natural snail habitats located in three states of Nigeria (one population per state) namely Enugu, Edo and River States were evaluated for pre-mating reproductive isolation using mate-choice tests. Total number of mated snails were very small (19.2%) compared to the number tested. Mating propensity (MP) varied significantly (P ≤ 0.05) among snail populations in two test groups and observed MP in the test groups differed significantly (chi-square test, P < < < <0.05; 0.001) from that expected under random mating. Pair formation was significantly (chi-square test, P < < < < 0.05; 0.001) influenced by differences in MP and within-population (homotypic) and between population (heterotypic) mating occurred in frequencies that differed significantly (chi-square test, P ℜ ℜ ℜ ℜ 0.05; 0.001) from that expected under random mating. Whereas observed heterotypic pair formation were less than that expected under random mating, homotypic pair formation were either equal or more than that expected under random mating. Duration of reproductive activities differed significantly (P ≤ 0.05) among test populations. It was concluded that reduced pair formation, elongated duration of courtship, and reduced mating between populations of A. marginata, indicate partial or incomplete pre-mating reproductive isolation.

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Reproductive characterization of three species of Giant African land snails (GALs) in captivity

Cited by 3 publications

References 15 publications

Population structure of a native and an alien species of snail in an urban area of the Atlantic Rainforest

Population structure of a native and an alien species of snail in an urban area of the Atlantic Rainforest

Genetic and phenotypic variations in egg shell colour of two ectotypes of Giant African Land Snail (Archachatina marginata var. saturalis)

Evaluation of pre-mating reproductive isolation in Archachatina marginata from three populations in the humid tropics

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