Journal
MARINE ENVIRONMENTAL RESEARCH
Volume 140, Issue -, Pages 145-151Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2018.06.011
Keywords
BACI design; Benthic mucilaginous aggregates; Coralligenous assemblages; Diversity; Mediterranean sea; Rocky habitat
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Mucilaginous aggregates produced by planktonic or benthic algae are considered ecological threats to marine systems. The study evaluated the effects of the spread of benthic mucilaginous aggregates on the structure of coralligenous assemblages. The assemblage and the quality of a site subjected to a benthic mucilage bloom were compared to those of two reference sites using a Before/After-Control/Impact (BACI) design. Results showed the a and beta-diversity, ESCA and COARSE quality ecological indices and the cover of encrusting algae and bryozoans were lower at the impact site after the mucilage event than at the control sites and at the impact site before the mucilage event. An opposite pattern was observed for the necrosis of gorgonians and the cover of algal turf. This study describes for the First time the impacts of ephemeral mucilage blooms on the whole coralligenous assemblage, identifying a further threat of this habitat and the need of adequate monitoring programs.
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