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Impact of a mouth parasite in a marine fish differs between geographical areas
Sala-Bozano, M.; Van Oosterhout, C.; Mariani, S. (2012). Impact of a mouth parasite in a marine fish differs between geographical areas. Biol. J. Linn. Soc. 105(4): 842-852. http://dx.doi.org/10.1111/j.1095-8312.2011.01838.x
In: Biological Journal of the Linnean Society. Academic Press: London; New York. ISSN 0024-4066; e-ISSN 1095-8312, meer
Peer reviewed article  

Beschikbaar in  Auteurs 

Trefwoorden
    Life history
    Plasticity
    Virulence
    Ceratothoa Dana, 1852 [WoRMS]; Sparidae Rafinesque, 1818 [WoRMS]
    Marien
Author keywords
    Ceratothoa; connectivity; life history; plasticity; Sparidae; virulence

Auteurs  Top 
  • Sala-Bozano, M.
  • Van Oosterhout, C.
  • Mariani, S.

Abstract

    Considerable variation exists in parasite virulence and host tolerance which may have a genetic and/or environmental basis. In this article, we study the effects of a striking, mouth-dwelling, blood-feeding isopod parasite (Ceratothoa italica) on the life history and physiological condition of two Mediterranean populations of the coastal fish, Lithognathus mormyrus. The growth and hepatosomatic index (HSI) of fish in a heavily human-exploited population were severely impacted by this parasite, whereas C. italica showed negligible virulence in fish close to a marine protected area. In particular, for HSI, the parasite load explained 34.4% of the variation in HSI in the exploited population, whereas there was no significant relationship (0.3%) between parasite load and HSI for fish in the marine protected area. Both host and parasite populations were not differentiated for neutral genetic variation and were likely to exchange migrants. We discuss the role of local genetic adaptation and phenotypic plasticity, and how deteriorated environmental conditions with significant fishing pressure can exacerbate the effects of parasitism.


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