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Of Pomacea (Ampullariidae)*

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Of Pomacea (Ampullariidae)* Bull. Org. mond. Sante 1972, 46, 243-247 Bull. Wld Hlth Org f Laboratory observations on the biological control of Biomphalaria glabrata by a species of Pomacea (Ampullariidae)* HELENE M. PAULINYI 1 & ERNEST PAULINI 2 Laboratory experiments have shown that medium-sized (30-S50 mm in shell height) Pomacea sp. snails consumed the egg masses ofBiomphalaria glabrata deposited either on glass or on the leaves of Salvinia, and that they also caused a high mortality rate among the newly hatched B. glabrata. When the two species ofsnail were kept in the same tank, the Pomacea sp. caused a reduction in the B. glabrata egg density in proportion to their relative numbers and the presence of Pomacea sp. prevented colonies of B. glabrata from becoming established. The identity of the Pomacea sp. has not yet been satisfactorily established. The control of Biomphalaria glabrata by predation Table 1. Snail collections around Lake Pampulha, of another snail (Marisa cornuarietis) has been Belo Horizonte, Brazil reported from Puerto Rico (Oliver-Gonzalez & Ferguson, 1959; Ruiz-Tiben, Palmer & Ferguson, No. of snails collected Date No. 1969), and was the object of laboratory studies by of dips B. Pomacea Physa Others Chernin, Michelson & Augustine (1956). One of the glabrata sp. sp. present authors (E. P.) has noted that since 1955 B. glabrata has been absent from a natural lake 15 May 1967 350 29 55 5 2 (Lake Sete-Mares) in the Municipio Pedro Leopoldo, 12 Sept. 1967 370 3 127 - - Minas Gerais, Brazil, about 40 km north of Belo 11 Feb. 1968 370 - 70 - Horizonte. Periodic collections from this lake have 25 Sept. 1968 360 15 153 10 - revealed the presence of a large population of snails belonging to a species of Pomacea, but B. glabrata 22 Dec. 1969 350 7 57 - has never been found in any collection in spite of the 7 July 1970 350 13 29 _ _ fact that most streams in that area harbour planorbid snails. Andrade (1959) referred to the presence of Pomacea haustrum (Reeves) in the lake of Pampulha The collections revealed many more Pomacea sp. (Belo Horizonte) and suggested that this ampullarid than any other snail, including B. glabrata (Table 1). snail might have " competed " with B. glabrata for From these observations it became evident that an the habitat since the planorbid population was experimental laboratory programme to study the smaller than reported previously. The present interaction between populations of Pomacea sp. and authors have made periodic snail collections along B. glabrata might be useful in explaining the absence the Pampulha lake shore during the last 3 years of B. glabrata from habitats containing Pomacea sp., (1967-70) at 35 stations situated at 500-m intervals. as observed in the field. * This study was supported by the World Health Organi- MATERlALS AND METHODS zation. I Biologist, Centro de Pesquisas Rene Rachou, Belo The snails used in the experiments were taken Horizonte, Brazil. 'Professor Titular, Escola de Engenharia da Universidade from laboratory colonies. These colonies were Federal de Minas Gerais, Belo Horizonte, Brazil. started with specimens of B. glabrata and Pomacea 2797 - 243 - 244 H. M. PAULINYI & E. PAULINI sp. collected in the Pampulha lake and maintained tion was made after a further 72 hours. A second run in 30-litre tanks. The water was continuously aerated was made with the same number of beakers and and illuminated with fluorescent lamps. Salvinia sp. leaves, but with only one observation being made and several specimens of Lebistes reticulatis were after 72 hours. There was no significant difference also kept in each tank. Fresh lettuce in abundance between the number of leaf disks with and without was supplied daily as food for the snails. The water eggs that were eaten but there was some indication of the tanks was changed once a week. Maximum that Pomacea sp. snails may occasionally prefer eggs and minimum temperatures were recorded every day. of B. glabrata in the presence of other food. Experiment 3 RESULTS The fate of newly hatched B. glabrata in the pre- Experiment 1 sence of Pomacea sp. snails was investigated in the The objective of the first experiment was to following way. Six 500-ml beakers were prepared observe the fate of B. glabrata egg masses in the with clean tap water and about 100 newly hatched presence of large Pomacea sp. snails. Nine 200-ml (1 day old) B. glabrata. One specimen of Pomacea beakers were stocked with 1-2 mature B. glabrata. sp. was added to each of three beakers, 2 Pomacea sp. After a few days, the snails and water were removed, snails were added to one beaker, and the other two and the number of egg masses deposited on the walls beakers were left without any Pomacea sp. snails. of each beaker was recorded. The beakers were then No food was given to the snails. After 24 hours, the filled with chlorine-free tap water and 1 Pomacea number of living B. glabrata was counted. The (about 30 mm in shell height) was added to each of results showed that the mortality of B. glabrata was 7 beakers; 2 beakers served as controls. No food significantly higher in the presence of Pomacea sp. was supplied to the Pomacea sp. After 24 hours the snails than in the control beakers, and that-when number of egg masses in each beaker was again correction is made for the natural mortality of recorded. the B. glabrata by means of Abbott's formula-the The results showed that in the absence of other Pomacea sp. snails caused a 60% reduction of the food Pomacea sp. apparently consumed 25 (74%Y.) of newly hatched snails under the experimental condi- the 34 egg masses present in the containers. This was tions. the first direct evidence for the destructive effect of Pomacea sp. on B. glabrata egg masses. Experiment 4 The previous experiments showed that Pomacea sp. Experiment 2 snails destroyed egg masses and newly hatched snails The fate of B. glabrata egg masses when leaves of when they were confined together in a relatively Salvinia were also present was then investigated. small space. The next experiment was designed to Since there was a possibility that Pomacea sp. might observe the fate of B. glabrata egg masses when they show a preference for the eggs of B. glabrata, were continuously produced by a fixed number of Salvinia leaves with and without egg masses were mature snails in breeding tanks in the presence of offered to these snails. various numbers of Pomacea sp. snails. For this Three groups (A, B, C) of 4 beakers were prepared; purpose 3 tanks (A, B, C) were prepared, each with each beaker contained 200 ml of water and 1 30 litres of water and 20 mature B. glabrata (shell Pomacea sp. snail (about 40 mm in shell height). To height 14-30 mm). Salvinia was added to cover each beaker of group A, 2 disks 1 cm in diameter about a third of the water surface. Altogether, cut out of Salvinia leaves without B. glabrata eggs 10 specimens of Pomacea sp. (shell height 37-50 mm) were added. To each beaker of group B, a 1-cm were placed in tank A and 2 Pomacea sp. were placed disk of Salvinia leaf with a B. glabrata egg mass on it in tank B. No ampullarid snails were added to and another disk without eggs were added. To each tank C. beaker of group C, two 1-cm disks of Salvinia leaf, Lettuce in excess was supplied daily to each tank. each bearing an egg mass, were added. The number of snails and the number of egg masses After 24 hours, the number of leaf disks with and of B. glabrata were counted and recorded weekly for without eggs that had been eaten by the snails was 10 weeks. The results given in Table 2 show that recorded. Disks that had been eaten were replaced there was a uniformly high egg density in tank C by new ones of the same kind, and another observa- containing no Pomacea sp. snails. The egg density BIOLOGICAL CONTROL OF BIOMPHALARIA GLABRATA BY A SPECIES OF POMACEA 245 Table 2. Production of egg masses by B. glabrata in the presence of Pomacea sp. Tank A Tank B Tank C Days l | Pomacea B. Egg mass Pomacea B. Egg mass B. Egg mass sp. glabrata a density b sp. glabrata a density b glabrata a density b 0 10 20/0 2 20/0 20/0 7 10 20/19 0.95 2 20/43 2.15 20/13 7.55 14 10 20/64 3.20 2 20/67 3.35 20/143 7.15 22 10 19/53 2.80 2 18/88 4.90 20/160 8.00 28 10 19/70 3.70 2 17/117 6.85 20/150 7.50 35 10 19/74 3.90 2 16/112 7.00 20/151 7.55 40 10 16/40 2.50 2 17/90 5.30 23/161 c 7.00 71 10 11/40 3.63 2 18/127 7.00 55/158 C 2.87 a Number of snails/number of egg masses. b Average number of egg masses/snail. c Juvenile snails also included. was somewhat lower in tank B (2 Pomacea sp. snails) Tank B with its mixed snail population showed the and about 50 % lower in tank A in the presence of influence of the Pomacea sp. snails on the B. glabrata. 10 Pomacea sp. There was only a slight increase in the planorbid population during the first month of observation; Experiment 5 later, B.
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