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Distribution patterns of two species of Corynosoma (Acanthocephala: Polymorphidae) in fishes from Southwestern Atlantic

  • Fish Parasitology - Original Paper
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Abstract

Corynosoma australe and C. cetaceum are the most frequently reported acanthocephalans in fish from the Argentine Sea, particularly in central and northern areas. Their definitive hosts are otariids and odontocete cetaceans, respectively. The low specificity of these larvae, in combination with high infective capability and long survival periods in fish, make them potentially good biological markers for stocks and other biological features of their fish hosts. In order to determine the distribution patterns of these species and their determining factors, a large dataset composed by newly collected fish samples, published and unpublished data from previous studies by the authors in the region were analysed in relation to host and environmental variables. The complete dataset comprised a total of 5084 fish, belonging to 29 species distributed in 21 families and 9 orders. Host size and trophic habits arose as the main determinants of abundance for both species of Corynosoma, showing higher abundances on larger fish and on higher trophic levels, as it is usual for trophically transmitted parasites. Biogeographic province and depth (indirectly representing the temperature of water) were the main drivers of the spatial distribution, displaying a latitudinal pattern associated to the temperature clines created by the interaction of Malvinas and Brazil currents, determining a decrease in abundance southwards and towards the deeper areas. No patterns were found regarding the distribution of definitive hosts. The knowledge of these distribution patterns of Corynosoma spp. in fish at regional scale, as well as of their causes, provides useful information to design management and conservation policies thus contributing to maintain the full and sustainable productivity of fisheries.

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Funding

Financial support was provided by grants from Consejo Nacional de Investigaciones Científicas y Técnicas (PIP No. 112–201,501-00973); Fondo para la Investigación Científica y Tecnológica (PICT 2015 No. 2013) and Universidad Nacional de Mar del Plata (EXA 915/18). This work is part of D.C Doctoral Thesis, carried out in the Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales.

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Correspondence to Delfina Canel.

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The authors declare that they have no conflict of interest.

Ethical statement

All fishes used in this work were obtained from commercial catches or research cruises. Therefore, no ethical statement is needed regarding use of animals for scientific purposes.

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Section Editor: Guillermo Salgado-Maldonado

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Detail of the composition of each sample of fish host in the Argentine Sea, along with data on parasite loads, from previously published studies in the Southwestern Atlantic. (XLSX 29 kb)

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Canel, D., Levy, E., Alarcos, A.J. et al. Distribution patterns of two species of Corynosoma (Acanthocephala: Polymorphidae) in fishes from Southwestern Atlantic. Parasitol Res 118, 2831–2841 (2019). https://doi.org/10.1007/s00436-019-06440-5

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  • DOI: https://doi.org/10.1007/s00436-019-06440-5

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