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During a 1-year study period between March 2000 and 2001, 195 (6%) out of 3236 Sagitta friderici were found to be parasitized by metacercariae of digenean species and metacestodes. Parasites belonged to Derogenes sp., Ectenurus virgulus, Monascus filiformis, Lepocreadiidae, Parahemiurus merus and tetraphyllidean metacestodes. Among the chaetognaths parasitized, 178 (91%) harboured one parasite, and the remaining 17 (9%) showed two or three parasites of the same or two different species. The highest prevalences for most of the species occurred in autumn-winter (April-August), except for E. virgulus, which had maximum values in summer (December-January). Species richness varied during the year, reaching a peak in May and June 2000 with six species. The metacercariae of Lepocreadiidae were present in autumn, winter and summer at all maturity stages of S. friderici, with higher prevalence values for stages 0 and I, whereas the rest of the digeneans were absent in stage 0, with higher prevalences for the more advanced maturity stages II and III. The different types of metacercariae did not seem to induce castration in the host. Copepods (Corycaeus amazonicus) were observed attached to the body of chaetognaths or partially digested in their gut. No nematodes, internal parasitic copepods or polychaetes were found. © The Author 2008. Published by Oxford University Press. All rights reserved.


Documento: Artículo
Título:Monthly occurrence of parasites of the chaetognath Sagitta friderici off Mar del Plata, Argentina
Autor:Daponte, M.C.; Gil De Pertierra, A.A.; Palmieri, M.A.; Ostrowski De Nuñez, M.
Filiación:Departamento de Biodiversidad Y Biologia Experimental, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Buenos Aires, C14428EA, Argentina
Consejo Nacional de Investigaciones Cientificas Y Tecnicas (Conicet), Universidad de Buenos Aires, Buenos Aires C14428EA, Argentina
Palabras clave:castration; developmental stage; invertebrate; maturation; parasite; parasite prevalence; parasitism; species occurrence; species richness; Argentina; Buenos Aires [Argentina]; Mar del Plata; South America; Chaetognatha; Copepoda; Corycaeus amazonicus; Derogenes; Ectenurus virgulus; Lepocreadiidae; Monascus; Monascus filiformis; Nematoda; Parahemiurus merus; Parasagitta fredrici; Polychaeta; Tetraphyllidea
Página de inicio:567
Página de fin:576
Título revista:Journal of Plankton Research
Título revista abreviado:J. Plankton Res.


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---------- APA ----------
Daponte, M.C., Gil De Pertierra, A.A., Palmieri, M.A. & Ostrowski De Nuñez, M. (2008) . Monthly occurrence of parasites of the chaetognath Sagitta friderici off Mar del Plata, Argentina. Journal of Plankton Research, 30(5), 567-576.
---------- CHICAGO ----------
Daponte, M.C., Gil De Pertierra, A.A., Palmieri, M.A., Ostrowski De Nuñez, M. "Monthly occurrence of parasites of the chaetognath Sagitta friderici off Mar del Plata, Argentina" . Journal of Plankton Research 30, no. 5 (2008) : 567-576.
---------- MLA ----------
Daponte, M.C., Gil De Pertierra, A.A., Palmieri, M.A., Ostrowski De Nuñez, M. "Monthly occurrence of parasites of the chaetognath Sagitta friderici off Mar del Plata, Argentina" . Journal of Plankton Research, vol. 30, no. 5, 2008, pp. 567-576.
---------- VANCOUVER ----------
Daponte, M.C., Gil De Pertierra, A.A., Palmieri, M.A., Ostrowski De Nuñez, M. Monthly occurrence of parasites of the chaetognath Sagitta friderici off Mar del Plata, Argentina. J. Plankton Res. 2008;30(5):567-576.