Detection and mapping of Posidonia oceanica dead matte by high-resolution acoustic imaging

Tomasello, Agostino; Luzzu, Filippo; Maida, Germana Di; Orestano, Carla; Pirrotta, Maria; Scannavino, Antonino; Calvo, Sebastiano

doi:10.5721/itjrs200941210

Cited by 10 publications

(14 citation statements)

References 15 publications

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“…On the basis of the model, the P. oceanica implant site in the Gulf of Palermo with the maximum TSI value (TSI = 16) was chosen. The transplant area was located on a seabed dominated by dead matte structures (Tomasello et al, 2009b) (Fig. 6), as some studies have shown that matte is a particularly suitable substratum for planting seagrass (Di Maida et al, 2013;Terrados et al, 2013)..…”

Section: Transplantation In the Gulf Of Palermo Monitoring Resultsmentioning

confidence: 99%

Transplantation assessment of degraded Posidonia oceanica habitats: site selection and long-term monitoring

Pirrotta¹,

Tomasello²,

Scannavino³

et al. 2014

Medit. Mar. Sci.

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A model developed for Zostera marina was adapted and used to select suitable areas for Posidonia oceanica transplantation in the Gulf of Palermo, where recent rehabilitation programmes have reduced human pressure. This model consists of three steps: (1) habitat selection, by calculation of the Preliminary Transplant Suitability Index (PTSI); (2) field assessments and test-transplanting, to evaluate the site suitability and to estimate the effects of tearing on transplant units (about 50%); (3) identification of suitable restoration sites, by calculation of the Transplant Suitability Index (TSI). A new parameter was added to the literature model: the number of grids detached, which is linked to factors (hydrodynamic regime, anchoring, fishing) that have a potentially great effect on the final outcome of the transplant. Only one site (TSI = 16) in the Gulf of Palermo was indicated as potentially suitable for restoration with P. oceanica. In this site, a transplant of 40 m2 was implemented. From 2008 to 2014, transplant effectiveness was evaluated in terms of establishment, detachment and mortality of cuttings and shoot density. The long-term monitoring (6 years) allowed us to detect changes in the structural conditions of the transplanted meadow and to identify the possible turning point in P. oceanica recovery (2 years after transplanting). Moreover, 6 years after transplantation the P. oceanica meadow has exceeded the transplant shoot density of about 16%, with a mean and a maximum value of 11.6 and 17 shoots per cutting, respectively.

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Section: Transplantation In the Gulf Of Palermo Monitoring Resultsmentioning

confidence: 99%

Transplantation assessment of degraded Posidonia oceanica habitats: site selection and long-term monitoring

Pirrotta¹,

Tomasello²,

Scannavino³

et al. 2014

Medit. Mar. Sci.

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“…Consequently, significant modification of the structure and composition of the seabed (from mostly rocky to sandy and muddy) and the extensive P. oceanica meadow that grew in this area regressed and residual patches were detected at 7 to 21 m depth [36]. (39), detected by Multibeam Echosounder MBES survey near "Bandita" (Gulf of Palermo), where the P. oceanica restoration site is located [11]. The black dot in the lower left corner identifies the location of the area covered by the MBSS survey.…”

Section: Study Areamentioning

confidence: 94%

“…The transplanted site (Figure 1) that was selected using multi-criteria model [11] is located on a seabed characterized by dead matte structures [39]. The topography of the seafloor is irregular and includes dead matte, circular eroded structures delimited by matte walls up to 1 m high and areas with sandy bottoms, which sometimes cover dead matte structures and are, thus, invisible to visual inspection [39].…”

Section: Study Areamentioning

confidence: 99%

“…Finally, the results were presented at the original scale to facilitate the interpretation of results. Instead, speed of growth and primary production of rhizomes were processed using the reference growth chart classification step by step procedure [46], to bypass the known confounding effect of shoot age [36,39,46,[50][51][52][53]. In this case, the most recent annual rhizome segments were excluded from the analysis to allow comparison with the reference values corresponding to each shoot age level (see [46] for further details).…”

Section: Biometrymentioning

confidence: 99%

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Performance Assessment of Posidonia oceanica (L.) Delile Restoration Experiment on Dead matte Twelve Years after Planting—Structural and Functional Meadow Features

Calvo

Luzzu

et al. 2021

Water

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Following the restoration of natural conditions by reducing human pressures, reforestation is currently considered a possible option to accelerate the recovery of seagrass habitats. Long-term monitoring programs theoretically represent an ideal solution to assess whether a reforestation plan has produced the desired results. Here, we report on the performance of a 20 m2 patch of Posidonia oceanica transplanted on dead matte twelve years after transplantation in the Gulf of Palermo, northwestern Sicily. Photo mosaic performed in the area allowed us to detect 23 transplanted patches of both regular and irregular shape, ranging from 0.1 to 2.7 m2 and an overall surface close to 19 m2. Meadow density was 331.6 ± 17.7 shoot m−2 (currently five times higher than the initial value of 66 shoots m−2), and it did not show statistical differences from a close by natural meadow (331.2 ± 14.9). Total primary production, estimated by lepidochronology, varied from 333.0 to 332.7 g dw m2/year, at the transplanted and natural stand, respectively. These results suggest that complete restoration of P. oceanica on dead matte is possible in a relatively short time (a decade), thus representing a good starting point for upscaling the recovery of the degraded meadows in the area.

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“…The model extracted 172.548 polygons but only 103,494 positive morphologies ( Figure 5) were finally related to C build-ups by visual inspection of the hillshade bathymetry and validation from video observations collected within the study area. Most of these artifacts have been attributed to: (a) bad roll correction that creates false positive elongated structures (Figure 5b,d), (b) occurrence of Posidonia oceanica dead matter on the shallow area that results in reliefs with typical sub-circular shape [39,40] (Figure 5e), and (c) artifacts concentration on DEM discontinues on its boundaries. The model extracted 172.548 polygons but only 103,494 positive morphologies ( Figure 5) were finally related to C build-ups by visual inspection of the hillshade bathymetry and validation from video observations collected within the study area.…”

Section: Coralligenous Extraction Accuracymentioning

confidence: 99%

Assessing Fine-Scale Distribution and Volume of Mediterranean Algal Reefs through Terrain Analysis of Multibeam Bathymetric Data. A Case Study in the Southern Adriatic Continental Shelf

Marchese

Bracchi

Lisi

et al. 2020

Water

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In the Mediterranean Sea, crustose coralline algae form endemic algal reefs known as Coralligenous (C) build-ups. The high degree of complexity that C can reach through time creates notable environmental heterogeneity making C a major hotspot of biodiversity for the Mediterranean basin. C build-up can variably modify the submarine environment by affecting the evolution of submerged landforms, although its role is still far from being systematically defined. Our work proposes a new, ad-hoc semi-automated, GIS-based methodology to map the distribution of C build-ups in shallow coastal waters using high-resolution bathymetric data, collected on a sector of the southern Apulian continental shelf (Southern Adriatic Sea, Italy). Our results quantitatively define the 3D distribution of C in terms of area and volume, estimating more than 103,000 build-ups, covering an area of roughly 305,200 m2, for a total volume of 315,700 m3. Our work firstly combines acoustic survey techniques and geomorphometric analysis to develop innovative approaches for eco-geomorphological studies. The obtained results can contribute to a better definition of the ocean carbon budget, and to the monitoring of local anthropogenic impacts (e.g., bottom trawling damage) and global changes, like ocean warming and acidification. These can affect the structural complexity and total volume of carbonate deposits characterizing the Mediterranean benthic environment.

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Detection and mapping of Posidonia oceanica dead matte by high-resolution acoustic imaging

Cited by 10 publications

References 15 publications

Transplantation assessment of degraded Posidonia oceanica habitats: site selection and long-term monitoring

Transplantation assessment of degraded Posidonia oceanica habitats: site selection and long-term monitoring

Performance Assessment of Posidonia oceanica (L.) Delile Restoration Experiment on Dead matte Twelve Years after Planting—Structural and Functional Meadow Features

Assessing Fine-Scale Distribution and Volume of Mediterranean Algal Reefs through Terrain Analysis of Multibeam Bathymetric Data. A Case Study in the Southern Adriatic Continental Shelf

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