Why long term trawled red algae beds off Balearic Islands (western Mediterranean) still persist?
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AuthorsOrdines, F. (Francesc); Ramón-Herrero, M. (Montserrat); Rivera, J. (Jesús); Rodríguez-Prieto, C. (Conxi); Farriols, M.T. (Maria Teresa); Guijarro, B. (Beatriz); Pasqual, C. (Catalina); Massutí, E. (Enric)
Red algae beds
Long term fishery
The bottom morphology, the surface sediments and the epibenthic community of two adjacent areas within the fishing ground traditionally known as Pesquera Rica (Balearic Islands) were characterized using multibeam echosounder, van Veen dredge and beam trawl. Red algae beds predominate in both areas, but one has been exploited by trawling since at least 90 years ago, whereas the presence of natural barriers prevents this fishing activity in the other one. Comparisons between the two areas showed a biomass reduction of 46.8 and 39.3% of dominant red algae taxonomic groups Peyssonneliaceae and Corallinophycidae, respectively, in the trawled area (TA). Similarly, both mean abundance and biomass of most groups of fauna were higher in the not trawled area (NTA). N90 biodiversity index showed higher mean values of algae species in NTA than in TA (7.0 and 4.9, respectively), whereas no differences were detected neither for sessile nor for mobile fauna. SIMPER analysis showed that large species ...
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