| Issue |
Ann. Parasitol. Hum. Comp.
Volume 51, Number 1, 1976
|
|
|---|---|---|
| Page(s) | 27 - 36 | |
| DOI | https://doi.org/10.1051/parasite/1976511027 | |
| Published online | 11 October 2017 | |
Mémoire
Étude des Trématodes parasites de Littorina saxatilis (Olivi) et de leurs effets sur cet hôte
A study of parasitic Trematods of Littorina saxatilis and their impact on this mollusc
Laboratoire de Zoologie-Parasitologie, U.E.R. des Sciences pharmaceutiques, 2 bis, Boulevard Tonnellé, F 37000 Tours, France.
L’étude mensuelle de populations de Littorina saxatilis (mollusque, gastéropode) très fortement parasitées a permis d’établir quelques relations entre ce mollusque et certains trématodes parasites qu’il héberge.
Les animaux ont été prélevés dans deux stations de la région de Roscoff (Finistère). Au total plus de 1.000 individus ont été examinés pour chaque station.
Onze espèces de cercaires ont été reconnues. Il est apparu que Microphallus similis était la plus représentée : 79,86 % des espèces trouvées. Ce taux de parasitisme varie peu au cours de l’année. Les populations fortement parasitées par Microphallus similis présentent une castration importante. Une double association de cercaires reste rare, mais cependant possible.
Il apparaît que les individus âgés sont les plus parasités. Il y aurait par ailleurs une croissance des parasites plus importante chez les femelles que chez les mâles.
Abstract
A monthly study of populations of Littorina saxatilis (mollusc, gasteropod) very strongly parasited has allowed to establish relations between the said mollusc and some parasite trematods which live in it.
A selection of animals was done in two stations of the Roscoff region (Finistere). A total fo more than a 1.000 individuals have been examined in each station.
Eleven species of cercairs have been spotted. It has appeared that the Microphallus similis was the most represented : 79,86 % of the total. This rate of parasitism does not change much throughout the year. The populations of molluscs strongly parasited by Microphallus similis show an important castration. A double association of cercairs remains rare but is yet possible.
It appears that aged individuals are the most parasited. It seems that there would be a growth of parasites more important in females than in males.
© Masson, Paris 1976, transferred to Société Française de Parasitologie
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