Meiofauna do talude continental e cânions da Bacia de Campos, com ênfase em Nematoda

Fonsêca-Genevois, Verônica da; Silva, Maria Cristina da; Lira, Viviane Freire; Neres, Patrícia Fernandes; Lima, Rita de Cássia Coelho; Esteves, André Morgado

doi:10.1016/b978-85-352-7263-5.50007-2

Cited by 2 publications

(3 citation statements)

References 78 publications

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“…The ranges of meiofauna densities and richness observed in the Santos Basin are comparable to those previously found in the shelf off Ubatuba (SP) and Cabo Frio (RJ) (Argeiro, 2009;Yaginuma, 2010) and in the Campos (Petrobras, 2013;Fonsêca-Genevois et al, 2017) and Espirito Santo Basins (Santos et al, 2016(Santos et al, , 2020Venekey et al, 2016). Meiofauna densities in these three Basins exceeded that in the shelf off Sergipe, south of Alagoas (Pinto et al, 2018).…”

Section: Discussion Meiofauna Distribution and Environmental Driverssupporting

confidence: 85%

Predicting large-scale spatial patterns of marine meiofauna: implications for environmental monitoring

Gallucci,

Fonseca,

Vieira

et al. 2023

Ocean Coast. Res.

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This study aims model the distribution of meiofauna indicators in relation to environmental variables from the Santos Basin continental margin, SE Brazil, using machine learning techniques, to provide baseline information and foster future monitoring programs. A total of 100 sampling stations were distributed in eight transects and 11 isobaths (25 to 2,400 m) perpendicular to the coast. In each station, three replicates were sampled for meiofauna and 38 environmental parameters. A total of 28 meiofauna taxa were found, with a mean richness varying from 3 to 15 taxa per station. Meiofauna mean density varied between 55 and 2,001 ind. 10 cm -2 . Density of meiofauna and its most frequent taxa (Nematoda, Copepoda, Kinorhyncha, and Polychaeta), and taxa richness were used as descriptors for the models. Meiofauna and nematode density showed the highest training and testing accuracies, with R² values above 0.74. Based on the distribution of meiofauna descriptors and their responses to environmental conditions, we suggest a mosaic of six benthic zones. The La Plata Plume zone and the Cabo Frio Upwelling zone are two of the most diverse and productive zones in the continental shelf, wich are separated by the less productive Central Continental Shelf zone. A fourth zone, with very low meiofauna densities, corresponds to the carbonated sediments of the shelf-break. The Upper and Mid-Slope is a narrow zone along the entire basin, with intermediate densities and small amounts of high-quality organic carbon. The largest, impoverished zone, the Lower Slope and Plateau comprises the deepest areas and the São Paulo Plateau. The study showed that, although some zones can be recognized by most meiofauna descriptors, others are better characterized by specific ones, implying that meiofauna indicators should be monitored concomitantly. We recommend the optimization of sampling design based on our model to reduce costs and increase our understanding of the system.

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Section: Discussion Meiofauna Distribution and Environmental Driverssupporting

confidence: 85%

Predicting large-scale spatial patterns of marine meiofauna: implications for environmental monitoring

Gallucci,

Fonseca,

Vieira

et al. 2023

Ocean Coast. Res.

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“…n. , and M. vitorius sp. n. were recorded only on the continental shelf (depth 25–50 m) of the Campos Basin, during a taxonomic study that also sampled on the continental slope (up to 3,000 m) of the basin ( Esteves et al, 2017 ; Fonsêca-Genevois et al, 2017 ). This observation may indicate a possible bathymetric restriction of these species.…”

Section: Discussionmentioning

confidence: 99%

“…In a study of nematode biodiversity in sediments of the Campos Basin, South Atlantic, of which this contribution is a part, members of the genus Microlaimus was dominant on the continental shelf, and contributed significantly to community structuring at depths of 25–50 m on the inner shelf ( Esteves et al, 2017 ; Fonsêca-Genevois et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Three new species of Microlaimus (Nematoda: Microlaimidae) from the South Atlantic

Lima¹,

Neres²,

Esteves³

2022

PeerJ

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Three new species of Microlaimus are described from the continental shelf of the Campos Basin, southwest Atlantic, Brazil. Microlaimus campiensis sp. n. differs from all other species in the presence of two anterior testes, slender spicules with enlarged proximal ends, 7–11 pre-cloacal papilliform supplements, and females with a pair of constriction structures, one on each branch of the ovary. Microlaimus alexandri sp. n. shows sexual dimorphism in the size of the amphidial fovea, which occupies 100% of the diameter of the corresponding area in the male; the buccal cavity provided with five teeth and a slightly cuticularized cuticular ring. Microlaimus vitorius sp. n. has four longitudinal-lateral rows of glands associated with small pores, one seta and three pores small pre-cloacal, and the gubernaculum has a triangular base. An amendment to the diagnosis of the genus is proposed, where the number of teeth was modified.

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Meiofauna do talude continental e cânions da Bacia de Campos, com ênfase em Nematoda

Cited by 2 publications

References 78 publications

Predicting large-scale spatial patterns of marine meiofauna: implications for environmental monitoring

Predicting large-scale spatial patterns of marine meiofauna: implications for environmental monitoring

Three new species of Microlaimus (Nematoda: Microlaimidae) from the South Atlantic

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