Fecundity Changes Induced by Low-Doses of Gamma Radiation on Biomphalaria straminea (Dunker, 1848)

Motta, M.; Melo, Ana Maria Mendonça de Albuquerque

doi:10.1590/s0074-02761997000400022

Cited by 5 publications

(3 citation statements)

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“…The rate of development was also higher in isolated control snails, as shown by the slope of the regression lines. This finding agrees with other physiological processes enhanced by ionizing radiation (Carvalho 1992, Motta 1997a) of snails. After gamma rays irradiation of the two experimental groups, the highest growth rate -compared to the control group -was observed in the 20 Gy dose-group, as indicated by the slope seen in the Table. Irradiation with 40 Gy induced a mild growth change only among the isolated group.…”

Section: Resultssupporting

confidence: 92%

Growth changes induced by gamma radiation on Biomphalaria straminea (Dunker, 1848)

Motta

Catanho

Melo

1999

Mem. Inst. Oswaldo Cruz

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Doses of 60 Co gamma radiation with 2. 5; 5; 7.5; 10; 15; 20; 25; 30; 35; 40; 45; 50; 55; 60; 80; 160; 320 and 640 In order to study controversial aspects in B. straminea shell development following exposure to ionizing radiation, the growing behavior of this epidemiological vector of schistosomiasis after exposure to low intensity gamma rays was studied, in colonies (cross fertilization) and sexually segregated (self fertilization) situations. MATERIALS AND METHODSA population of 1,080 snails of B. straminea, BH breed obtained from Centro de Pesquisas Aggeu Magalhães-Fiocruz, was exposed to gammarays obtained from a 60 Co source receiving doses of 2. 5; 5; 7.5; 10; 15; 20; 25; 30; 35; 40; 45; 50; 55; 60; 80; 160; 320 and 640 Gy, applied to groups of 30 snails per dose. An additional group of 60 non irradiated (0 Gy) snails was kept as control.The mollusks were bred from eggs laid with a maximal difference of two days and were raised in laboratory for approximately 50 days. All snails were in a reproductive development stage.Fifty percent of the studied population was kept in colonies and the other half was maintained isolated in sexual segregation, allowing cross fertilization and self fertilization, respectively, in each set. Consequently, the snail in each groups/dose were placed in individual (isolated) and collective (colony) aquariums with the ratio of water volume/ snail (50 ml) kept constantly replenished with water (25°C ± 2°C and pH 6.6-6.8) during the period of observation.The irradiation of the snails by gamma-rays was done with groups of 30 snails held inside glass The embryological development of snails is particularly affected by ionizing radiation as stated by Liard et al. (1968), Okazaki et al. (1996), Melo et al. (1996) and Melo (1998). A previous report stated that following irradiation with gamma rays, a cessation in the development of the shell may occur (Perlowagora-Szumlewicz & Berry 1964). Snails of different ages showed the same shell diameter as observed by Rey (1967), Leal (1976), Rozenberg (1989) and Carvalho (1992 tubes by dose and placed in gamma-cell irradiator, model RL-60, from Radionics Laboratory, with dose rate of 0.97 Gy per minute. In order to avoid copulation during the exposure time, the snails were separated by a thin cotton cushion, in the isolated set of mollusks. The control group remained in a dark environment for the same time as the maximal (640 Gy) irradiation was applied in order to have the same conditions of temperature and humidity as those used in the irradiation procedure.The diameter was measured daily by means of a caliper applied to the major shell diameter, with the sites used for measuring marked with white ink. RESULTS

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Section: Resultssupporting

confidence: 92%

Growth changes induced by gamma radiation on Biomphalaria straminea (Dunker, 1848)

Motta

Catanho

Melo

1999

Mem. Inst. Oswaldo Cruz

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“…Although this is the first study published on the effects of irradiation on a terrestrial mollusc, there have been a number of detailed studies regarding the effects of irradiation on the survival and reproductive ability of Biomphalaria glabrata, a fresh water snail species (Perlowagora-Szumlewicz 1964a-d;Perlowagora-Szumlewicz & Berry, 1964;Liard et al, 1968). In addition, there are several studies dealing with the effects of irradiation on other species of Biomphalaria (da Motta & Melo, 1997;Nabih & Rizk, 1984).…”

Section: Discussionmentioning

confidence: 99%

“…However, there are no published studies relating to the reproductive sensitivity of terrestrial molluscs to irradiation. Data for aquatic molluscs are limited to two species in the genus Biomphalaria (Liard et al 1968;Perlowagora-Szumlewicz, 1964a-d;da Motta & Melo, 1997). In this study, our objective was to determine the minimum absorbed dose of irradiation that would prevent egg laying and egg hatching in Zonitoides arboreus (Say), a snail pest that feeds on the roots of orchids and other ornamental plants.…”

Section: Introductionmentioning

confidence: 99%

Effects of irradiation on the reproductive ability of Zonitoides arboreus, a snail pest of orchid roots

Hollingsworth

Follett

Armstrong

2003

Annals of Applied Biology

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The effect of irradiation on the reproductive ability of the orchid snail, Zonitoides arboreus, a serious pest of potted orchids in Hawaii, was investigated. Weekly egg production averaged between 0.8 and 1.9 over a 9-wk period for snails not exposed to irradiation, and egg hatch averaged 61%. In comparison to untreated controls, irradiation of snails at the lowest dose tested (34-37 Gy) reduced egg production and egg hatch by 63% and 94%, respectively over a 9-wk period. None of the snails treated with levels of irradiation ≥ 69 Gy produced viable eggs. This is the first study measuring the effect of ionising irradiation on a terrestrial snail or slug species using sterilising doses. Overall, the results show that the reproductive ability of this snail species is affected by irradiation in a similar manner as for Biomphalaria glabrata, an aquatic snail for which the effects of irradiation have been studied in detail.

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The effects of permethrin on rat ovarian tissue morphology

Kotil

Yön

2015

Experimental and Toxicologic Pathology

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Fecundity Changes Induced by Low-Doses of Gamma Radiation on Biomphalaria straminea (Dunker, 1848)

Cited by 5 publications

References 3 publications

Growth changes induced by gamma radiation on Biomphalaria straminea (Dunker, 1848)

Growth changes induced by gamma radiation on Biomphalaria straminea (Dunker, 1848)

Effects of irradiation on the reproductive ability of Zonitoides arboreus, a snail pest of orchid roots

The effects of permethrin on rat ovarian tissue morphology

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