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A potential zoonotic parasite, the digenean Gymnophalloides nacellae, on the Magellanic coast in the Southwestern Atlantic Ocean: its life cycle and geographical distribution

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Abstract

This is an integrative study of a potential zoonotic digenean from the Magellanic Southwestern Atlantic coast. The life cycle of the gymnophallid Gymnophalloides nacellae Cremonte, Pina, Gilardoni, Rodrigues, Chai and Ituarte, 2013 (Digenea) at the type locality, Puerto Deseado (47° 45′ S, 65° 51′ W), Santa Cruz province, was elucidated. This digenean uses the upper subtidal clam Gaimardia trapesina (Lamarck) (Gaimardiidae), which lives on the fronds of the giant kelp, as first intermediate host. A very short-stem furcocercous cercaria emerges and enters the limpets, Nacella magellanica (Gmelin) and N. deaurata (Gmelin) (Nacellidae), which live in the lower rocky intertidal zone. The unencysted metacercariae inhabit the extrapallial space of the limpet at high prevalences and intensities of infection. When the black oystercatcher Haematopus ater Vieillot and Oudart (Charadriidae) preys upon it, it becomes infected, acting as the definitive host. This parasite seems to exhibit a high specificity for their first and second intermediate hosts. Its geographical distribution is from 47 to 55° S in Patagonia, and it is restricted to those sites where the giant kelp reaches to lower intertidal and upper subtidal zones where the limpets are present. Gymnophalloides seoi Lee, Chai and Hong, 1993, a parasite of the Pacific oyster Magallana gigas (Thunberg) (Ostreidae), causes a zoonotic disease in Korea; thus, G. nacellae represent a risk of being a zoonotic parasite if infected limpets are consumed.

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Acknowledgements

Field works were conducted with permits provided by Wildlife Secretary of Santa Cruz province (Resolution Number 861/08). Authors thank to C. Ituarte, J. Diaz, E. Lorenti, M. Demetrio, A. Frizzera and M.E. Diez for the help in field and laboratory work, C. Medina for the help in molecular studies, A. Gatto and D. Zelaya for information about the host distributions, D. Podestá for the oystercatcher and limpet pictures, T. Zapata from Centro de Investigaciones, Universidad de la Patagonia Austral at Puerto Deseado, for kindly providing access to laboratory facilities, M. Luquet (Aluar S.A.) for the SEM photographs. Financial support was provided by ANPCyT (PICTs 2013-1702, 2016-0653, 2015-0841, Préstamo BID) y Conservation, Food and Health Foundation. FC, CG and EB are members of the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).

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Correspondence to Carmen Gilardoni.

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Gilardoni, C., Di Giorgio, G., Bagnato, E. et al. A potential zoonotic parasite, the digenean Gymnophalloides nacellae, on the Magellanic coast in the Southwestern Atlantic Ocean: its life cycle and geographical distribution. Polar Biol 43, 725–734 (2020). https://doi.org/10.1007/s00300-020-02674-7

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  • DOI: https://doi.org/10.1007/s00300-020-02674-7

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