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Detrimental effects of the isopod, Edotia doellojuradoi, on gill morphology and host condition of the mussel, Mytilus edulis platensis

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Abstract

There are many reported associations between mussels and other invertebrates, such as pea crabs, polychaetes, turbellarians and copepods, which live in their mantle cavities. The boundary between commensalism and parasitism is often indistinguishable because of insufficient knowledge or because the interaction is variable. Preliminary evidence led to a closer examination of the relationship between the mussel, Mytilus edulis platensis, and an isopod, Edotia doellojuradoi, previously described as commensalism. Monthly intertidal samples of mussels were taken from September 2004 to August 2005 at Caleta Cordova Norte (45°43′S, 67°22′W) in southern Argentina and assessed for the prevalence and abundance levels of isopods. Mussels with and without isopods were measured, examined for evidence of gill damage and their condition (soft tissue dry weight) was determined. The overall isopod prevalence in mussels was 57.9% and infestation varied with mussel length, with maximum occurence at 30.2 mm (medium-sized mussels). Experimental evidence indicated that the position of the isopod inside the mussel depended on the feeding activity of the mussel. Female isopods were observed grasping the ventral food groove of the gill demibranchs and feeding on the mucous food strand produced by the mussel. Juveniles and males were observed clustered together on the dorsal side of the single female in each occupied mussel, suggesting extended maternal care. Gill damage was observed in 58.2% of mussels at the Argentine site and was significantly associated with isopod occurrence. Categorical regression analysis showed that the most important factor associated with the degree of gill lesions was the number of male and juvenile isopods per mussel, followed by the length of female isopods and the developmental stage of juveniles. Conversely, the degree of gill damage decreased with increasing mussel length. Overall, E. doellojuradoi had a significant effect on mussel condition throughout the year, with low flesh weight in mussels with isopods, except during the austral summer and early autumn. In contrast to previous studies, which concluded that the isopod was a commensal, the present study clearly demonstrates that E. doellojuradoi is a parasite of M. edulis platensis. Other symbiotic interactions formerly classified as commensal might not be innocuous on further investigation, especially if samples are taken at multiple sites and at different times of the year.

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Acknowledgments

The authors sincerely thank Javier A. Tolosano for his help in the field surveys and Alicia Boraso de Zaixso for revision and criticism of the manuscript. Microalgae were kindly provided by Laura Perez and Susana Perales from the Marine Microalgae Culture Collection (Depto. Biol. Gral., FCN, UNPSJB). The performed experiments complied with the current laws of the Republic of Argentina.

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Authors and Affiliations

  1. Instituto de Desarrollo Costero, Universidad Nacional de la Patagonia San Juan Bosco (UNPSJB), Ciudad Universitaria, Km 4 (9000) Comodoro Rivadavia, Chubut, Argentina

    Héctor E. Zaixso, Paula Stoyanoff & Damián G. Gil

  2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina

    Héctor E. Zaixso

  3. Departamento de Gestión Ambiental, FHyCS, UNPSJB, Chubut, Argentina

    Héctor E. Zaixso & Damián G. Gil

  4. Departamento de Biología General, FCN, UNPSJB, Chubut, Argentina

    Paula Stoyanoff & Damián G. Gil

Authors
  1. Héctor E. Zaixso
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  2. Paula Stoyanoff
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  3. Damián G. Gil
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Correspondence to Héctor E. Zaixso.

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Communicated by J. P. Grassle.

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Zaixso, H.E., Stoyanoff, P. & Gil, D.G. Detrimental effects of the isopod, Edotia doellojuradoi, on gill morphology and host condition of the mussel, Mytilus edulis platensis . Mar Biol 156, 2369–2378 (2009). https://doi.org/10.1007/s00227-009-1265-3

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