Abstract:The great ecological and economic value of the biocenoses of Marine Protected Area 'Capo Caccia-Isola Piana' (MPA) requires a constant monitoring. For this reason, a continuous study of the area producing overlapping maps useful to control in real time the evolution of the biocenoses is necessary. The integrated use of several methodologies, such as Side Scan Sonar, Remote Operating Vehicle and Drone, has allowed us to realize a very detailed map. This paper presents the marine benthic map of the MPA and compa… Show more
“…The Alghero Bay mapped area has been ideally subdivided into three environmental units (Units 1-3), representing areas with similar biocenotic, sedimentological and morphological conditions and human activities (Figure 2). The adopted subdivision refers to Pérès and Picard (1964) and to the adjacent map of the Marine Protected Area Capo Caccia-Isola Piana (De Luca et al, 2018).…”
Section: Resultsmentioning
confidence: 99%
“…The Alghero Bay (40°34 ′ N-8°13 ′ E) is located in NW Sardinia (Figure 1(B)) and extends from Capo Galera to Alghero Harbour, it has 14 km of coastline and a sea extension of 1600 ha (Figure 1(C)). To the northwest, it is delimited by the Marine Protect Area of Capo Caccia-Isola Piana (AMP) starting just west of Capo Galera promontory (Figure 1(C)) (De Luca et al, 2018).…”
Section: Area Of Studymentioning
confidence: 99%
“…reducing the wave energy) and nourishing (i.e. supplying bioclastic material) the beach systems (De Luca et al, 2018;De Muro et al, 2008;Manca et al, 2013;Pergent, et al, 1995;Postacchini et al, 2019;Vacchi et al, 2016), but it is suffering the seagrasses worldwide regression. A detailed and continuous mapping of the seagrass distribution in the temperate regions, such as those of the Mediterranean Sea, it is, therefore, necessary to monitor this habitat and ensure its conservation (De Muro & De Falco, 2015;Tecchiato et al, 2015).…”
The Alghero Bay is a coastal area of high economic value because of the presence of one of the most popular beaches of Sardinia (San Giovanni, Maria Pia, Le Bombarde, Lazzaretto). The organisms living in the meadow of Posidonia oceanica, which densely cover the offshore areas of the bay, represent the most important source of sediments to these beaches. For this reason, a detailed mapping of the local seabed features and distribution of P. oceanica constitutes an important tool for the coastal managing of the area. The integrated use of several methodologies, such as Side Scan Sonar, Remote Operating Vehicle, Drone and direct sediment sampling has allowed us to realize a very detailed seafloor map of the Alghero Bay.
“…The Alghero Bay mapped area has been ideally subdivided into three environmental units (Units 1-3), representing areas with similar biocenotic, sedimentological and morphological conditions and human activities (Figure 2). The adopted subdivision refers to Pérès and Picard (1964) and to the adjacent map of the Marine Protected Area Capo Caccia-Isola Piana (De Luca et al, 2018).…”
Section: Resultsmentioning
confidence: 99%
“…The Alghero Bay (40°34 ′ N-8°13 ′ E) is located in NW Sardinia (Figure 1(B)) and extends from Capo Galera to Alghero Harbour, it has 14 km of coastline and a sea extension of 1600 ha (Figure 1(C)). To the northwest, it is delimited by the Marine Protect Area of Capo Caccia-Isola Piana (AMP) starting just west of Capo Galera promontory (Figure 1(C)) (De Luca et al, 2018).…”
Section: Area Of Studymentioning
confidence: 99%
“…reducing the wave energy) and nourishing (i.e. supplying bioclastic material) the beach systems (De Luca et al, 2018;De Muro et al, 2008;Manca et al, 2013;Pergent, et al, 1995;Postacchini et al, 2019;Vacchi et al, 2016), but it is suffering the seagrasses worldwide regression. A detailed and continuous mapping of the seagrass distribution in the temperate regions, such as those of the Mediterranean Sea, it is, therefore, necessary to monitor this habitat and ensure its conservation (De Muro & De Falco, 2015;Tecchiato et al, 2015).…”
The Alghero Bay is a coastal area of high economic value because of the presence of one of the most popular beaches of Sardinia (San Giovanni, Maria Pia, Le Bombarde, Lazzaretto). The organisms living in the meadow of Posidonia oceanica, which densely cover the offshore areas of the bay, represent the most important source of sediments to these beaches. For this reason, a detailed mapping of the local seabed features and distribution of P. oceanica constitutes an important tool for the coastal managing of the area. The integrated use of several methodologies, such as Side Scan Sonar, Remote Operating Vehicle, Drone and direct sediment sampling has allowed us to realize a very detailed seafloor map of the Alghero Bay.
“…molluscs (Russo et al ., 1991), mysidaceans (Maj & Taramelli, 1989), polychaetes (Gambi et al ., 1995, 1989) and sponges (Manconi et al ., 2005, 2009, 2013; Cadeddu et al ., 2014; Padiglia et al ., 2015, 2018 a ) inhabiting the sandy-silty-rocky seabed dominated by Posidonia oceanica meadows as recently mapped by De Luca et al . (2018). Fig.…”
We report on the relationships between some conspicuous Mediterranean photophilous sponge species and Caulerpa cylindracea, a non-indigenous species. A diversification of defence strategies and behaviour is highlighted in target species belonging to different orders of Demospongiae from a western Mediterranean Marine Protected Area (NW Sardinian Sea). Caulerpa cylindracea displays a strongly invasive behaviour during body colonization of the Irciniidae Sarcotragus spinosulus and Ircinia retidermata (order Dictyoceratida). These sponges possess pre-adaptive defensive morpho-functional and physiological traits enabling them to partly withstand algal invasion. Also Aplysina aerophoba (order Verongiida) seems to be able to control colonization. Successful anti-Caulerpa strategies characterize the rarely affected Crambe crambe (order Poecilosclerida). Species-specific competitive strategies are displayed at different levels of body architecture, behaviour and physiology by native sponge species. The invasion patterns on sponges, the invasion dynamics in 2016–2017 and topographic distribution of C. cylindracea on S. spinosulus confirm this algal species as a threat, with potential long-term effects on sponge assemblages. Data suggest other kinds of poorly investigated synergic stressors affecting these habitat-forming species. Defence strategies of sponge species take the form of: (1) passive deterrence by morpho-functional pre-adaptive traits as growth form, biomass amount, surface traits, and microhabitat within the sponges' aquiferous system; (2) active physiological defence, whereby the morphology/anatomy of the sponge body is adapted to control invaders, by body remodelling and regenerative processes within the aquiferous system and at the sponge surface; (3) presumed active chemical defence by exudation processes of bioactive compounds.
“…Marine Protected Areas (MPAs) are left in their natural state to preserve biodiversity and protected species (De Luca et al, 2018) and play a key role in the promotion of the suitable use of marine resources and ecological conservation (Agardy, 1994). The European Framework and national laws award protection to these particular areas by imposing measures to monitor the environmental status of such areas (e.g.…”
We present the first seabed map of the shallow-water areas of Lampione, the islet of the Pelagie Islands Marine Protected Area (Sicily Channel, Italy). The seafloor was mapped from the coast to a depth of about 75 m, using high-resolution multibeam systems (both for bathymetry and backscatter) along with ground-truth data in the form of grab samples and ROV videoobservations. By integrating these original data, a first seabed classification was produced through the use of the Remote Sensing Object Based Image Analysis, a semi-automatic segmentation approach. The resulting 1: 5.000 scale map includes sediment types and habitat distribution contributing to the knowledge of the peculiar marine ecosystem observed at Lampione. In particular, the map provides the first indication of the wide occurrence of rhodolith/maërl habitats at Lampione, which are among the most important ecosystems in the Mediterranean Sea.
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