Marine Biology

, Volume 158, Issue 5, pp 995–1003 | Cite as

Effects of salinity on multiplication and transmission of an intertidal trematode parasite

Original Paper


Salinity levels vary spatially in coastal areas, depending on proximity to freshwater sources, and may also be slowly decreasing as a result of anthropogenic climatic changes. The impact of salinity on host–parasite interactions is potentially a key regulator of transmission processes in intertidal areas, where trematodes are extremely common parasites of invertebrates and vertebrates. We investigated experimentally the effects of long-term exposure to decreased salinity levels on output of infective stages (cercariae) and their transmission success in the trematode Philophthalmus sp. This parasite uses the snail Zeacumantus subcarinatus as intermediate host, in which it asexually produces cercariae. After leaving the snail, cercariae encyst externally on hard substrates to await accidental ingestion by shorebirds, which serve as definitive hosts. We found that at reduced salinities (25 or 30 psu), the cercarial output of the parasite was lower, the time taken by cercariae to encyst was longer, fewer cercariae successfully encysted and encysted parasites had lower long-term survival than at normal seawater salinity (35 psu). The strong effect of salinity on the replication and transmission of this parasite suggests that there may be sources and sinks of transmission to birds along coastal areas, depending on local salinity conditions. Also, unless it evolves to adapt to changing conditions, the predicted reduction in salinity as a consequence of climate change may have negative impact on the parasite’s abundance.


Salinity Level Salinity Treatment Snail Host Infected Snail Trematode Parasite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Anja Studer, Tommy Leung and Christoph Matthaei for assistance with logistical and statistical aspects of this study and Melanie Lloyd, Devon Latoa and Nathan Brown-Haysom for assistance during snail collection.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of ZoologyUniversity of OtagoDunedinNew Zealand

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