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First survey of sessile communities on subtidal rocks in an area with hydrothermal vents: Milos Island, Aegean Sea

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Abstract

The major epibenthic communities on subtidal rocks of Palaeochori Bay and the marine tract on the southern coast of Milos Island (Greece) were described down to 44 m depth. Six sites were investigated by snorkelling and SCUBA diving. Samples, photographs and video images were also taken to integrate information. Three out of the six sites were close to hydrothermal vents, a common feature in the area. In total, nine major epibenthic communities were found, most of which were characterised by a diverse algal growth down to the maximum depth explored. Macrobenthic cover was severely reduced only in the close proximity of vents, a white flocculent bacterial mat covering the rock at the point from which fluid escaped. Large-scale effects of vents on the epibenthic communities were not detected. However, the abundance of species with warm-water affinity was recognisable in both algal and animal dominated communities, which may be related to higher winter temperature in the vent area. Epifaunal communities under overhangs were composed of distinct groups of suspension feeders at vent as compared to non-vent sites: this might indicate differences in trophic conditions. Mounds of the bioconstructional coralline alga Mesophyllum lichenoides were conspicuous only at vent sites, thus suggesting enhanced biodeposition of carbonates due to vent activity.

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Authors and Affiliations

  1. Marine Environment Research Centre, ENEA Santa Teresa, P.O. Box 316, I-19100, La Spezia, Italy

    Silvia Cocito

  2. Marine Environment Research Centre, ENEA Santa Teresa, P.O. Box 316, I-19100, La Spezia, Italy

    C. Nike Bianchi & Andrea Peirano

  3. DIPTERIS, Università di Genova, Corso Europa 26, I-16132, Genova, Italy

    Carla Morri

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  1. Silvia Cocito
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Cocito, S., Bianchi, C.N., Morri, C. et al. First survey of sessile communities on subtidal rocks in an area with hydrothermal vents: Milos Island, Aegean Sea. Hydrobiologia 426, 113–121 (2000). https://doi.org/10.1023/A:1003991117108

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