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Results of research on the active species protection of the Roman snail (Helix pomatia, Linnaeus, 1758) using farmed snails in the second year of life. First season of the study

100%

Ligaszewski M., Pol P., Radkowska I., Surowka K., Lysak A.

Annals of Animal Science

2014

tom 14

nr 2

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The effect of magnetic field on farmed populations of Helix aspersa O. F. Muller, 1774

100%

Ligaszewski M., Lysak A., Janas P., Mach-Paluszkiewicz Z.

Folia Malacologica

2011

tom 19

nr 1

In order to assess the effect of alternating electromagnetic and direct magnetic field on adult Helix aspersa O. F. Müller and their eggs, adults and eggs of H. aspersa maxima Taylor and H. aspersa aspersa O. F. Müller were exposed to such fields with different parameters, and the following life cycle traits were observed: condition of hibernating adults, their survival rate during hibernation and reproduction, egg mass, hatching success, growth rate of hatchlings and body mass of next generation adults. Adults were exposed to sinusoidal, alternating electromagnetic fields of 50 Hz, 100 Hz and 200 μT, and magnetic induction of 50 Hz, as well as a field of 175 μT and 10–1000 Hz (repetition period 80 minutes). Egg batches were exposed to direct magnetic fields of magnetic induction 5 μT and 10 μT and alternating electromagnetic fields of analogous induction and frequency of 50 Hz. The effects varied depending on the parameters of the fields, subspecies and life cycle stage. Adult H. aspersa maxima was more sensitive to the changes in characteristics of electromagnetic field than H. aspersa aspersa, but the two subspecies showed a similar reaction to exposing their eggs to direct or alternating magnetic field. Probably direct field had a greater selection effect compared to alternating field, removing weaker genotypes at embryonic stage; this resulted in a greater mean body mass of the next generation adults. The results are preliminary; further studies, with further modifications of parameters of the fields applied are necessary.

Metazoan parasites in wild and farmed populations of the scallops, Argopecten purpuratus [Lamarck, 1819] from Northern Chile

100%

Oliva M. E., Castillo L., Sanchez M.

Acta Parasitologica

2004

tom 49

nr 2

Differences in the parasite faunas of wild and farmed populations of the northern scallops, Argopecten purpuratus, from northern Chile, were compared. Infections of tapeworm larvae (plerocercoids of Acanthobothrium sp. and Rhinebothrium sp.) do not occur in the farmed scallops owing to unsuitable conditions for transmission, whereas, by contrast, there is a significantly higher occurrence of the burrowing polychaeta Polydora sp. in farmed conditions. These results can be explained in that farming conditions preclude completion of the tapeworm life cycle, since the infective stage cannot access the scallops suspended in the water column. Meanwhile crowding in the farmed population, as compared to the wild one, may favor infection by Polydora sp.

Ograniczanie wyników

1 Acta Parasitologica

1 Annals of Animal Science

1 Folia Malacologica

2 Ligaszewski M.

2 Lysak A.

1 Castillo L.

1 Janas P.

1 Mach-Paluszkiewicz Z.

1 Oliva M. E.

1 Pol P.

1 Radkowska I.

1 Sanchez M.

1 Surowka K.

1 2014

1 2011

1 2004

Wyniki wyszukiwania

Results of research on the active species protection of the Roman snail (Helix pomatia, Linnaeus, 1758) using farmed snails in the second year of life. First season of the study

The effect of magnetic field on farmed populations of Helix aspersa O. F. Muller, 1774

Metazoan parasites in wild and farmed populations of the scallops, Argopecten purpuratus [Lamarck, 1819] from Northern Chile