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Can the studies at a spatial scale of 100s meters detect the spatio-temporal fluctuations of a parasite assemblage?

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Parietti M., Merlo M. J., Etchegoin J. A.

Acta Parasitologica

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2013

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tom 58

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nr 4

The importance of small-scale heterogeneity in local factors which overrides that of larger-scales factors, suggest that local factors play a major role in determining the richness and prevalence of larval digeneans in intertidal gastropods. The restricted distribution of the snail Heleobia australis along a 500 m transect in Cangrejo creek (Mar Chiquita, Argentina) provides a good opportunity to test the assumption that a study at spatial scale of 100s meters can detect spatiotemporal fluctuations of a larval digenean assemblage. To analyze that, 3600 specimens of H. australis were collected seasonally during the year 2011. A quantitative variation and a space-time interaction between sampling points and seasons of the year for the total prevalence of larval digeneans and snail’s densities were found, as well as a positive correlation with abiotic factors. These results revealed that the fluctuations in the community of larval digeneans of the snail H. australis can be detected at small spatial scale, using its natural distribution of 500 m. This study also highlights the importance of seasonality as a factor that must be considered in studies focused on the search for patterns structuring the communities of larval digeneans, at medium and large scales.

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Larval trematodes infecting the South-American intertidal mud snail Heleobia australis (Rissooidea: Cochliopidae)

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Alda P., Martorelli S. R.

Acta Parasitologica

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2014

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tom 59

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nr 1

Larval trematodes infecting the snail Heleobia australis (Cochliopidae) from the Bahía Blanca estuary, Argentina were surveyed for two years. A total of 7,504 snail specimens was dissected and the larval stages of 15 different trematodes were recovered and examined morphologically. These larvae included four species that had previously been reported from H. australis in Brazil, Uruguay, and Argentina: the heterophyid Ascocotyle (Phagicola) longa and the microphallids, Maritrema bonaerense, Maritrema orensense, and Microphallus simillimus. Three other species, the echinostomatid Stephanoprora uruguayensis, the microphallid Levinseniella cruzi, and the psilostomid Psilochasmus oxyurus are reported here for the first time as parasites of H. australis. Eight other trematodes found in H. australis are described and placed in the appropriate superfamilies, families or genera (Cryptogonimidae, Apocreadiidae, Aporocotylidae, Notocotylidae, Haploporidae, Renicolidae, Himasthla, and Renicola). The prevalence of the trematode taxa infecting H. australis in the Bahía Blanca estuary was low (<3%) with a single exception (M. simillimus; >20%). Microphallidae were the richest and the most prevalent family, probably because of the high abundance of crabs — the second-intermediate hosts of certain microphallid species — and the considerable diversity of gulls. Here we compare the parasite assemblage found in the H. australis from Bahía Blanca estuary with other parasite assemblages infecting Heleobia spp. and other rissooids from the rest of the world.

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First molecular identification of Ascocotyle (Phagicola) longa in its first intermediate host the mud snail Heleobia australis

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Alda P., Bonel N., Panei C. J., Cazzaniga N. J., Martorelli S. R.

Acta Parasitologica

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2015

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tom 60

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nr 4

Ograniczanie wyników

3 Acta Parasitologica

2 Alda P.

2 Martorelli S. R.

1 Bonel N.

1 Cazzaniga N. J.

1 Etchegoin J. A.

1 Merlo M. J.

1 Panei C. J.

1 Parietti M.

1 2015

1 2014

1 2013

Can the studies at a spatial scale of 100s meters detect the spatio-temporal fluctuations of a parasite assemblage?

Larval trematodes infecting the South-American intertidal mud snail Heleobia australis (Rissooidea: Cochliopidae)

First molecular identification of Ascocotyle (Phagicola) longa in its first intermediate host the mud snail Heleobia australis