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Density, size structure, shell orientation and epibiontic colonization of the fan mussel Pinna nobilis L. 1758 (Mollusca: Bivalvia) in three contrasting habitats in an estuarine area of Sardinia (W Mediterranean)
Addis, P.; Secci, M.; Brundu, G.; Manunza, A.; Corrias, S.; Cau, A. (2009). Density, size structure, shell orientation and epibiontic colonization of the fan mussel Pinna nobilis L. 1758 (Mollusca: Bivalvia) in three contrasting habitats in an estuarine area of Sardinia (W Mediterranean). Sci. Mar. (Barc.) 73(1): 143-152. https://dx.doi.org/10.3989/scimar.2009.73n1143
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Endangered species
    Interspecific relationships > Epibiosis
    MED, Italy, Sardinia
    MED, Western Mediterranean
    Population characteristics > Population density
    Population characteristics > Population structure > Size distribution
    Bivalvia [WoRMS]; Pinna nobilis Linnaeus, 1758 [WoRMS]
    Mediterranean Sea - Western Basin [Marine Regions]; Sardinia [Marine Regions]
    Marien/Kust
Author keywords
    Pinna nobilis; Bivalvia; endangered species; population density; sizedistribution; epibiosis; Sardinia; western Mediterranean
Auteurs  Top 
  • Addis, P.
  • Secci, M.
  • Brundu, G.
  • Manunza, A.
  • Corrias, S.
  • Cau, A.
Abstract
    We investigated the spatial distribution, size structure, shell orientation and valve colonization by epibionts of the endangered Mediterranean bivalve Pinna nobilis in three continuous but different habitats in the Gulf of Oristano (Sardinia, western Mediterranean). The sampling stations chosen were: an estuarine area (E) of coastal salt-marshes characterized by unvegetated sea-bottoms; and two areas in a seagrass meadow characterized by an extensive Posidonia oceanica meadow (Mw) and patched mixed meadows of P. oceanica and Cymodocea nodosa (Me). We found significant differences in mean densities among stations and the highest value was found in the estuarine area. Shell orientation showed that there was uniform circular distribution of specimens in the Mw station and a unimodal distribution in the Me and E stations, where specimens were set at 0°N and 10°NNE, which is a pattern related to sea drift. Shell epibiosis displayed differences between habitats. The highest valve colonization was in the estuary, with filamentous dark algae and Ostrea edulis reaching almost 90 percent of shell coverage. This study provides new information on habitat preferences and data for assessing local populations of P. nobilis that is useful for its conservation and improving the knowledge of its ecology.
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