Abstract
The highly invasive freshwater snail, Physa acuta, was examined for parasites over temporal and spatial scales. All populations studied had a high prevalence of the parasitic morph of the oligochaete worm, Chaetogaster limnaei. This worm was also found to infect two native snails, Glyptophysa gibbosa and Austropeplea tomentosa, at lower prevalences. Seasonality and collection sites did not significantly influence the worm’s infection dynamics, but strong positive correlations were found between the sizes of P. acuta individuals and both the likelihood of infection and infection intensity. The ectocommensal morph of C. limnaei was found in all three pulmonate species. Physa acuta was infected with two digenean trematode species which were also found in two native snails, Posticobia brazieri and G. gibbosa. One digenean, found within the renal gland of P. acuta, did not significantly influence the presence or infection intensity of the renal gland-dwelling C. limnaei parasitic morph. All parasites infecting P. acuta were also found to be infecting sympatric native freshwater snails. The effects that such host sharing by parasites may have upon the establishment of P. acuta as a successful invader merit further study.
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Acknowledgements
The authors would like to thank Dr Winston Ponder of the Australian Museum, for his identification of Posticobia brazieri, Dr Tom Cribb of the University of Queensland, for freely sharing his knowledge regarding the parasites of Posticobia brazieri, Associate Professor Darren Ryder for his suggested study sites, and Sandy Watson and Louise Streeting for their technical assistance. We would also like to thank two anonymous reviewers for their helpful comments and suggestions which greatly improved this manuscript.
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Mitchell, D.R., Leung, T.L.F. Sharing the load: a survey of parasitism in the invasive freshwater pulmonate, Physa acuta (Hygrophila: Physidae) and sympatric native snail populations. Hydrobiologia 766, 165–172 (2016). https://doi.org/10.1007/s10750-015-2452-5
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DOI: https://doi.org/10.1007/s10750-015-2452-5