Characterization of Energy Gradient in Enclosed Bays of Ubatuba Region, South-eastern Brazil

Mahiques, Michel Michaelovitch de; Tessler, Moysés Gonsalez; Furtado, Valdenir Veronese

doi:10.1006/ecss.1998.0368

Cited by 78 publications

(113 citation statements)

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“…Despite the generally low energy conditions, three areas can be distinguished, each varying in its silt, clay and organic matter content: a finer and richer Central and North Zone; a West Inner Zone with fine sand, silt and clay besides a moderate organic matter content, and a South Zone plus the largest rivers, characterized by medium sand and low values of organic matter. These results follow the general pattern found in the northeast coast of São Paulo State as showed early by Mahiques et al 1998.…”

Section: Discussionsupporting

confidence: 89%

“…2), but can be characterized as a low energy environment also. In this region, the Ubatuba Bay exhibits a constriction in the coastline that induces wave refraction (Mahiques et al 1998) and acts as a barrier for the intrusion of waves from the open sea. As it is known, wave action is one of the principal hydrodynamic phenomena responsible for the bottom sedimentary processes in coastal areas (Furtado and Mahiques 1989) and can explain the features observed.…”

Section: Discussionmentioning

confidence: 99%

“…1). Geologically, it is characterized by the presence of granites and migmatites, part of the Serra do Mar mountain chain, which reaches the shore in this portion of the coast (Mahiques et al 1998).…”

Section: Study Areamentioning

confidence: 99%

“…The input of fluvial sediments is strongly dependent on the rainfall regime (Mahiques et al 1998) leading to a higher contribution during the summer season. Four rivers flow into the bay and greatly influence its water quality (CETESB 1996), especially during rainy periods when large amounts of untreated sewage are introduced from Ubatuba City.…”

Section: Study Areamentioning

confidence: 99%

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Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)

Burone

Muñiz

Pires-Vanin

et al. 2003

An. Acad. Bras. Ciênc.

110

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Analyses of organic matter content, organic carbon, nitrogen, sulfur and granulometric variables were performed on 101 surface sediment samples from Ubatuba Bay in order to investigate the spatial distribution of organic matter, its origin and the relationships among its components. The samples were obtained with a manual corer, from water depths between 1 and 15m during 5 cruises of the R/V ''Veliger II'', two months apart. Pearson correlation, regression and Principal Component Analysis (PCA) statistical methods were used to analyze the data. Strong correlations between organic matter and fine sediment fractions were obtained. The PCA revealed at least two main sample groups that reflect the different environmental conditions prevalent in the bay. There is a simple linear relationship between organic carbon content and the organic matter content determined by the calcination technique. Taking into account that the analysis of organic matter content is less expensive and less time consuming than the analysis of organic carbon, the present method of estimation can be useful when fast evaluation of the organic carbon content is needed for samples from similar environments.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)

Burone

Muñiz

Pires-Vanin

et al. 2003

An. Acad. Bras. Ciênc.

110

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“…1), during 1974-1976. Ubatuba sites are sheltered from wave action, with predominantly muddy sand bottoms (Mahiques et al, 1998). Schizoporella colonies were fixed to rocks at about 1 m below MLWS, together with other sessile organisms such as the macroalgae Acanthophora spicifera, Laurencia papillosa and Sargassum filipendula, the sponges Zygomycale parishii, Tedania ignis, Haliclona erina, Halichondria magniconulosa, and colonies of cnidarians and tunicates.…”

Section: Methodsmentioning

confidence: 99%

The macrofauna associated with the bryozoan <i>Schizoporella unicornis</i> in southeastern Brazil

Morgado¹,

Tanaka²

2001

Sci. Mar.

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SUMMARY:The invertebrate fauna associated with colonies of the bryozoan Schizoporella errata was studied at two sites differing in hydrodynamism in southeastern Brazil. Patterns of species distribution, abundance, and diversity were similar at both sites. Polychaetes dominated the assemblages, both in number of individuals and species, with 70 species distributed in 20 families. Decapod crustaceans were also abundant, mainly anomuran crabs and caridean shrimps. Cluster analysis separated the samples from each site, and further analysis indicated that an interaction between water movement and trophic structure could explain these differences. At the site with low water movement, more muddy sediments were found inside the colonies, and a greater proportion of deposit-feeders was found. At the other site, higher hydrodynamism resulted in less sediments within the colonies, and favoured the occurrence of more filter-feeders. The trophic structure of faunal assemblages can help understand the structure of assemblages associated with biogenic substrata, as already demonstrated for benthic communities.

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The Beaches of the State of São Paulo

Mahiques

Siegle

Alcántara‐Carrió

et al. 2016

Coastal Research Library

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Characterization of Energy Gradient in Enclosed Bays of Ubatuba Region, South-eastern Brazil

Cited by 78 publications

References 0 publications

Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)

Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)

The macrofauna associated with the bryozoan <i>Schizoporella unicornis</i> in southeastern Brazil

The Beaches of the State of São Paulo

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