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Enemies with benefits: parasitic endoliths protect mussels against heat stress
Zardi, G.I.; Nicastro, K.R.; McQuaid, C.D.; Ng, T.P.T.; Seuront, J.L.; Seuront, L. (2016). Enemies with benefits: parasitic endoliths protect mussels against heat stress. NPG Scientific Reports 6(31413): 8 pp. hdl.handle.net/10.1038/srep31413
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322, more
Peer reviewed article  

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  • Zardi, G.I.
  • Nicastro, K.R.
  • McQuaid, C.D.
  • Ng, T.P.T.
  • Seuront, J.L.
  • Seuront, L.

Abstract
    Positive and negative aspects of species interactions can be context dependant and strongly affected by environmental conditions. We tested the hypothesis that, during periods of intense heat stress, parasitic phototrophic endoliths that fatally degrade mollusc shells can benefit their mussel hosts. Endolithic infestation significantly reduced body temperatures of sun-exposed mussels and, during unusually extreme heat stress, parasitised individuals suffered lower mortality rates than non-parasitised hosts. This beneficial effect was related to the white discolouration caused by the excavation activity of endoliths. Under climate warming, species relationships may be drastically realigned and conditional benefits of phototrophic endolithic parasites may become more important than the costs of infestation.

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