| Title | Marine geodiversity of northeastern Brazil: a step towards benthic habitat mapping in Pernambuco Continental Shelf |
| Download | Download (whole publication) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Lucatelli, D; Camargo, J M R; Brown, C J; Souza-Filho, J F; Guedes-Silva, E; Araújo, T C M |
| Source | Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; by Todd, B J ; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Geological Survey of Canada, Open File 8295, 2017 p. 81, https://doi.org/10.4095/305889  Open Access |
| Links | GeoHab 2017
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| Year | 2017 |
| Publisher | Natural Resources Canada |
| Meeting | 2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; May 1-4, 2017 |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Program and abstracts: 2017
GeoHab Conference, Dartmouth, Nova Scotia, Canada |
| File format | pdf |
| Area | Pernambuco; Brazil |
| Lat/Long WENS | -35.0000 -33.0000 -7.0000 -10.0000 |
| Subjects | marine geology; surficial geology/geomorphology; environmental geology; geophysics; mapping techniques; oceanography; marine environments; coastal studies; conservation; marine organisms; marine
ecology; resource management; biological communities; environmental studies; ecosystems; continental margins; continental shelf; continental slope; benthos; marine sediments; seafloor topography; bedforms; textures; sedimentary structures;
bathymetry; Northeastern Brazil Continental Shelf; Biology |
| Program | Offshore Geoscience |
| Released | 2017 09 26 |
| Abstract | The Northeastern Brazil Continental Shelf (NEBCS) is one of the largest shelves off the Brazilian coast, and it is strongly influenced by volcanic and tectonic processes. It can be divided in three
portions: Inner shelf (limited by 20 m isobaths), Mid-shelf (from 20 to 40 m depth), and Outer shelf (beyond 40 m depth). Pernambuco is one of the nine States from the Northeast region of Brazil, comprising a coast line of 187 Km (from 07°37.71'S to
08°54.34'S) and an average width of 33.28 Km. The littoral zone is strongly influenced by urban development, with extreme pollution in some areas, particularly near the capital Recife and the metropolitan region. Nevertheless, there are two Marine
Protected Area (MPA) included in the Pernambuco EEZ, namely "Fernando de Noronha Archipelago" and "APA Costa dos Corais". However, there have been no habitat mapping studies within this region of the continental shelf, and only a small number along
Brazilian coast. Based on the limited information available, the present work aimed to initiate the compilation of existing seafloor data sets on the Pernambuco region. The main objective was to map the physiography and relate it with the classes of
sediment, providing a map of the geodiversity from the coast of Pernambuco (from inner to outer shelf).
To achieve the objectives of the study, abiotic data available in a public database, and results of technical-scientific surveys from the area
were explored. Specifically, topography, slope, and sedimentary texture data were integrated. The topography was based on Gorini (1996). The map curvature was generated on ArcMap 10.1 software. Folks' classes were used to classify the sediment and
stations were interpolated by natural neighbor. To improve the information for the locality, data from the Brazilian National Oceanographic Data Bank (BNDO) was added. Thus, a total of 314 samples were accomplished for the analyses. Multidimensional
and PCA analyses were conducted using PRIMER 6.
Results of bathymetric analysis suggested some considerations: Inner and Outer shelf are narrow in the south and broaden northward along the shelf. On the other hand, the Mid-shelf is a broad
southward and narrow at North portion. The slope is variable, being possible to observe several long portions with low degree (0.8-1°) of steepness along the Inner shelf. The presence of steps toward Mid-shelf could be observed as well. A flat
portion is registered at the southern part of the shelf. Irregular areas are shown toward North. Pernambuco's platform presents its edge between 55-65 m, revealing an extended stability of the continental shelf, in terms of tectonic and sedimentary
processes. The abrupt gradient variation of the shelf edge is clearly marked, as well as the strong steepness on superior slope. Additionally, the MDS and PCA analyses reflect the influence of terrigenous sediment, coming from continental region for
the Inner shelf, and the presence of calcareous algae plus organogenic fragments (from beach-rocks and corals) on the mid and outer shelf. The sediment composition is highly relevant to the benthos distribution. Based on our results a texture map was
constructed showing the general pattern for the sediment distribution along the shelf of Pernambuco. |
| Summary | (Plain Language Summary, not published)
The sixteenth annual GeoHab Conference was held this year (2017) at the Waterfront Campus of the Nova Scotia Community College in Dartmouth, Nova Scotia,
Canada. |
| GEOSCAN ID | 305889 |
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