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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

100%

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

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Cadmium concentrations in the Bahia Blanca Estuary (Argentina). Potential effects of dissolved cadmium on the diatom Thalassiosira curviseriata

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Andrade S. J., Pucci A. E., Marcovecchio J. E.

Oceanologia

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2000

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tom 42

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nr 4

Concentrations of dissolved and particulate cadmium were measured in the water of the Bah´ıa Blanca Estuary, one of the most highly industrialised regions in Argentina. Simultaneously, Cd contents were also determined in samples of phytoplankton. Thus, the estuary was characterised from the viewpoint of Cd occurrence. Additionally, a microscale environment was selected within the estuary in order to carry out an ecotoxicological study. Thus, environmental parameters (i.e. temperature, salinity, nutrients, chlorophyll a) were measured weekly at Puerto Cuatreros (in the inner estuary) during winter, when the phytoplankton bloom occurs; during the other seasons sampling was done twice a week. In addition, cells of the diatom Thalassiosira curviseriata – the dominant species in the phytoplankton bloom – were isolated and cultivated in the laboratory. The monoclonal cultures obtained were exposed to increasing concentrations of Cd under controlled environmental conditions and the growth rate inhibition was measured. As a preliminary conclusion it was found that Cd levels in the Bah´ıa Blanca Estuary are significantly lower than the EC50 value for T. curviseriata.

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Environmental cadmium and lead concentrations in the Bahia Blanca Estuary (Argentina). Potential toxic effects of Cd and Pb on crab larvae

80%

Ferrer L., Contardi E., Andrade S. J., Asteasuain R., Pucci A. E., Marcovecchio J. E.

Oceanologia

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2000

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tom 42

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nr 4

The Bahia Blanca Estuary includes a large tidal plain with an area close to 1150 km2.Mud is predominant in its sediments, where a significant population of the crab Chasmagnathus granulata lives during the whole year.Mo reover, there are important urban and industrial discharges into this environment. Cd and Pb concentrations were determined in samples of water (for both dissolved and suspended particulate matter) and surface sediments (total and <63 μm fractions).Or ganic matter was analysed in the sediments, while temperature, salinity, pH and dissolved oxygen were measured in the estuarine water The metal concentrations determined in this study were: 1.47 ± 1.08 μg Cd g−1 and 14.68 ± 4.31 μg Pb g−1 in surface sediments; 2.21 ± 1.33 μg Cd g−1 and 25.70 ± 7.09 μg Pb g−1 in the <63 μm sediment fraction; 0.18 ± 0.11 μg Cd g−1 and below the analytical detection limit of Pb in suspended particulate matter. Furthermore, dissolved Cd and Pb were lower than the norms for marine and estuarine waters (2 μg dm−3 for Cd and 5 μg dm−3 for Pb, E.P.A.). Simultaneously, the effects of Cd and Pb were studied on recently hatched larvae of Ch. granulata, through 96-hour semi-static acute assays.Via bility was the criterion assessed in the assays.LC 50 (96 h) for Cd was 46.43 μg dm−3 (36.92 − 56.34 μg dm−3), whilst that for Pb was 1. 0 mg dm−3 (0.79 − 1.23 mg dm−3), which demonstrates that Cd is more toxic towards larvae.F inally, both LC50 values determined for Cd and Pb were higher than the corresponding metal concentrations measured in the Bah´ıa Blanca environment.

Ograniczanie wyników

2 Acta Parasitologica

2 Oceanologia

2 Alda P.

2 Andrade S. J.

2 Marcovecchio J. E.

2 Martorelli S. R.

2 Pucci A. E.

1 Asteasuain R.

1 Bonel N.

1 Cazzaniga N. J.

1 Contardi E.

1 Ferrer L.

1 Panei C. J.

1 2015

1 2014

2 2000

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

Cadmium concentrations in the Bahia Blanca Estuary (Argentina). Potential effects of dissolved cadmium on the diatom Thalassiosira curviseriata

Environmental cadmium and lead concentrations in the Bahia Blanca Estuary (Argentina). Potential toxic effects of Cd and Pb on crab larvae