Abstract
In aquatic environments, externally developing eggs are in constant contact with the surrounding water, highlighting the significance of water parameters and pathogens for egg survival. In this study we tested the impact of water salinity, egg density and infection potential of the environment on egg viability in the sand goby (Pomatoschistus minutus), a small fish that exhibits paternal egg care and has a marine origin, but which in the Baltic Sea lives in brackish water. To manipulate the infection potential of the environment, we added either a Saprolegnia infection vector into UV-filtered water or a fungicide into natural Baltic Sea water. Saprolegnia are widely spread water moulds that are a key cause of egg mortality in aquatic organisms in fresh- and brackish water. We found that increased water salinity indeed decreased the egg infection rate and had a positive effect on egg viability, while high egg density tended to have the opposite effect. However, the different factors influenced egg viability interactively, with a higher egg density having negative effects at low, but not in high, salinity. Thus, the challenges facing marine organisms adapting to lower salinity levels can be amplified by Saprolegnia infections that reduce egg survival in interaction with other environmental factors. Our results support the hypothesis that suppressing egg infections is an important aspect of parental care that can select for filial cannibalism, a common but poorly understood behaviour, especially in fish with parental care.
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Acknowledgements
We thank Anniina Saarinen, Emilie Suominen and Jolanda Linsén for their invaluable help with maintaining the fish and their eggs, Ola Svensson for inspiring discussions and comments on the manuscript, Kai Lindström for the loan of equipment and Jaana Koistinen, Joanna Norkko and the rest of the helpful staff of the Tvärminne Zoological Station for logistic support. TKL was funded by the Department of Biology, University of Turku. CK thanks the Swedish Research Council for funding (Grant 621-2011-4004). This work is part of that of the Linnaeus Centre for Marine Evolutionary Biology (CeMEB).
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All applicable national guidelines for the care and use of animals were followed. The experimental procedures were approved by ELLA—the National Animal Experiment Board of Finland.
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Communicated by Joel Trexler.
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Lehtonen, T.K., Kvarnemo, C. Infections may select for filial cannibalism by impacting egg survival in interactions with water salinity and egg density. Oecologia 178, 673–683 (2015). https://doi.org/10.1007/s00442-015-3246-1
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DOI: https://doi.org/10.1007/s00442-015-3246-1