Heterogeneity of rhodolith beds expressed in backscatter data

Rocha, Gabriella Aleixo; Bastos, Alex Cardoso; Amado‐Filho, Gilberto M.; Boni, Geandré C.; Moura, Rodrigo L.; Oliveira, Natacha de

doi:10.1016/j.margeo.2020.106136

Cited by 17 publications

(12 citation statements)

References 43 publications

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“…The combination of visual surveys and acoustic data represented the best approach for the identification of RBs, and the high backscatter registered in association with this habitat was in accordance with recent literature (e.g., [8,67,81]). However, backscatter can vary according to many factors such as, among the others, incident angle, sediment type, grain size, seabed slope and roughness [81,82], thus ground truth is essential for a proper interpretation.…”

Section: Rhodolith Beds Variability From Small To Large Scalesupporting

confidence: 87%

Rhodolith Beds Heterogeneity along the Apulian Continental Shelf (Mediterranean Sea)

Chimienti

Rizzo

Kaleb

et al. 2020

JMSE

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Rhodolith beds represent a key habitat worldwide, from tropical to polar ecosystems. Despite this habitat is considered a hotspot of biodiversity, providing a suite of ecosystem goods and services, still scarce quantitative information is available thus far about rhodolith beds occurrence and ecological role, especially in the Mediterranean Sea. This study reports the composition and patterns of distribution of rhodolith assemblages found in four study areas along ca. 860 km of coast in the Central Mediterranean Sea. These rhodolith beds were studied for the first time and significant differences at all spatial scales have been highlighted, documenting the high variability of this habitat. Rhodolith species composition, morphology and distribution have been discussed considering the potential role of environmental factors in driving these patterns. The need for improving their protection is discussed to complement present conservation and management initiatives, particularly in the frame of the EU Marine Strategy Framework Directive.

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Section: Rhodolith Beds Variability From Small To Large Scalesupporting

confidence: 87%

Rhodolith Beds Heterogeneity along the Apulian Continental Shelf (Mediterranean Sea)

Chimienti

Rizzo

Kaleb

et al. 2020

JMSE

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“…The total coverage of the sea bottom is achieved by using MBES and SSS systems, which, through swath type scanning of the seafloor, can cover vast areas of the bottom in brief time. MBES is not only used primarily for collecting bathymetry data but, through the backscatter of the acoustic signal, may also produce information about the lithology and HT of the bottom equivalent, if not better, to those of the SSS (Collier and Brown, 2005;Le Bas and Huvenne, 2009;Di Maida et al, 2011;Papatheodorou et al, 2012;Innangi et al, 2015;Lacharitéet al, 2018;Rocha et al, 2020;Prampolini et al, 2021). In order to produce the final map, this acoustic backscatter data have to be verified and linked to a habitat or bottom type (BT) by using ground-truthing data, like sediment and biota sampling and an underwater video (Kostylev et al, 2001;Solan et al, 2003;Hühnerbach et al, 2007;Innangi et al, 2019;Sañéet al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Marine priority habitat mapping in a Mediterranean conservation area (Gyaros, South Aegean) through multi-platform marine remote sensing techniques

et al. 2022

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The aim of this study is to present the results of the first complete marine habitat mapping through marine remote sensing techniques in Gyaros Island, a remote island in the Cyclades archipelago with a great historical and ecological value. Gyaros Island is of great biological importance and, for this reason, since 2011, is part of the NATURA 2000 network and, by 2019, is characterised as a marine protected area (MPA). More than 80 km2 of seafloor area were inspected through a multi-platform marine remote sensing technique survey through two individual expeditions in 2014 and 2017. The remote sensing survey was conducted utilising side scan sonar, sub bottom profiler and multi- and single-beam echosounders. In addition to the remote sensing survey, an extensive ground truth network was established utilising a underwater towed camera and VanVeen sediment grabber. These resulted in the area being fully covered with high-quality data. Through these, a classification of the area was performed based on three distinct seafloor habitat mapping schemes (Expert, European Nature Information System and NATURA HD). The survey and the classification revealed that over 50% of the seafloor is covered by Posidonia oceanica meadows and coralligenous and other calcareous bio-concretion priority habitats. Based on the results of this work, Gyaros MPA was also established and different protections and conservation zones were set.

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“…Uncalibrated backscatter intensity values vary from -14 dB to -29 dB. (Rocha et al, 2020), comprising 73 km² of multibeam data and footage from 88 dropcam sites.…”

Section: Forgotten Reefs (Recifes Esquecidos)mentioning

confidence: 99%

“…In MPA Costa das Algas, the regional habitat map showed rhodolith classes covering 100% of the area. A higher resolution approach allowed to achieve a higher level of detail in the incised valleys, as well as to acknowledge regions with different rhodolith coverage (as proposed by Rocha et al, 2020). The Forgotten Reefs area is not shown in the regional bathymetric map (1:50000 scale).…”

Section: Multi-design Approach: From Broad To Finer Detailsmentioning

confidence: 99%

The role of benthic habitat mapping for science and managers: A multi-design approach in the Southeast Brazilian Shelf after a major man-induced disaster

Menandro

Lavagnino²,

Vieira³

et al. 2022

Front. Mar. Sci.

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Seabed mapping is currently the baseline information for ocean management and conservation, and is an indispensable item within research and Marine Spatial Planning. Here, we use a case study and published data along the southeast Brazilian continental shelf to illustrate the concepts and ideas of potential benthic habitat mapping and the importance of having maps on different scales and the potential for using a multi-design approach. The case analysis presented here uses a regional map and distinct criteria (seabed geodiversity and biodiversity, and potential influence of a tailings plume) to define three areas along the continental shelf to be mapped in a high-resolution, as part of a marine monitoring program. The background of the case study is a tailing dam failure disaster that led to the input of iron ore tailings in the ocean, leading to a major environmental disaster. Three areas were chosen, including: a Marine Protected Area (MPA Costa das Algas), a major fishing ground (the Doce River prodelta/depocenter), and an understudied reef area (Forgotten Reefs). Potential benthic habitat mapping was carried out using acoustic surveys (multibeam echosounder acquiring bathymetry and backscatter) and ground-truthing (sediment samples and seafloor image). Results detailed the potential habitats throughout the three areas, providing primary information for the study of benthic habitats and their distribution. The multi-design approach indicated that although a regional analysis can indicate potential vulnerability as a first assessment approach, high-resolution potential habitat mapping (herein, 20 m or finer) is beneficial to evaluate and produce a higher-confidence level for decision-makers. Having an overall view of what and where to collect new and finer data would be best to identify vulnerable areas that, in this case study, could be threatened by plume dispersion and tailings accumulation. Our results support the delineation of priority areas aiming for monitoring, protection and guiding for other studies, besides the consolidation of habitat importance and the integration of various datasets through a hierarchical classification scheme. Although Brazil has never produced a regional or national habitat map for the entire continental margin, there are already conditions to plan, execute and maintain a habitat mapping program, partnering with Universities, Government Institutions (e.g., the Brazilian Navy), and the private sector. In the context of the UN Decade of Ocean Science targets, it is urgent to plan and implement a national database capable of supporting a habitat classification effort on a broader national scale, with the flexibility to support a multi-design or a multi-scale approach.

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Heterogeneity of rhodolith beds expressed in backscatter data

Cited by 17 publications

References 43 publications

Rhodolith Beds Heterogeneity along the Apulian Continental Shelf (Mediterranean Sea)

Rhodolith Beds Heterogeneity along the Apulian Continental Shelf (Mediterranean Sea)

Marine priority habitat mapping in a Mediterranean conservation area (Gyaros, South Aegean) through multi-platform marine remote sensing techniques

The role of benthic habitat mapping for science and managers: A multi-design approach in the Southeast Brazilian Shelf after a major man-induced disaster

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