Variation in worm assemblages associated with Pomacea canaliculata (Caenogastropoda, Ampullariidae) in sites near the Río de la Plata estuary, Argentina
Biocell
;
30(3): 457-468, dec. 2006. tab
Article
Dans Anglais
| LILACS
| ID: lil-491545
ABSTRACT
Pomacea canaliculata is a common gastropod in freshwater habitats from Central and Northern Argentina, extending northwards into the Amazon basin. Several Platyhelminthes have been reported associated to P. canaliculata, sharing an intimate relationship with this gastropod host. The objectives of this study were to describe the symbiotic species assemblages associated to P. canaliculata in the study area, and to disclose differences among them. Samples were taken in three typical small streams and one artificial lentic lagoon, all connected with the Rio de la Plata estuary. The 81.53% were infested with different symbiotic (sensulato) species. Among the Platyhelminthes, the commensal Temnocephala iheringi Haswell, 1893 was highly prevalent in all samples, always in the mantle cavity. Four trematode taxa were recognized (a) metacercariae of Echinostoma parcespinosum Lutz, 1924 in the mantle cavity and sporocysts in the digestive gland; (b) metacercariae of Dietziella egregia (Dietz, 1909) in the pericardial cavity; (c) unidentified xiphidiocercariae and (d) unidentified sporocysts and furcocercariae in the digestive gland. Nematode larvae and oligochaetes were found in two localities in the mantle cavity. Among the Annelida, Helobdella ampullariae Ringuelet, 1945 was found in the mantle cavity and lung of snails only from one locality. Our results show that although some of the symbionts are present in all localities, others are restricted to some particular ones, whether in their absolute numbers or in their relative abundance. Thus, eachhosting population at the studied localities may be defined by the particularcombination of symbionts that bears.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Escargots
/
Symbiose
/
Trematoda
/
Helminthes
/
Étapes du cycle de vie
/
Annelida
Type d'étude:
Facteurs de risque
Limites du sujet:
Animaux
Pays comme sujet:
Amérique du Sud
/
Argentine
langue:
Anglais
Texte intégral:
Biocell
Thème du journal:
Clulas
Année:
2006
Type:
Article
Pays d'affiliation:
Argentine
Institution/Pays d'affiliation:
UNLP/AR
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