Assessment of plankton community and environmental conditions in São Sebastião Channel prior to the construction of a produced water outfall

Abstract

Plankton community and hydrological conditions were assessed as a part of ao environmental diagnosis in São Sebastião Channel, before the building of a submarine outfall of produced water from the oil maritime terminal of PETR08RÁS. Samples were collected in twenty oceanographic stations located in the oil terminal neighboring area, during the springtime of 1991. Oissolved inorganic nutrients and chlorophyll-a concentrations observed indicate an oligo-mesotrophic environment. Phenols and sulfides were absent, 800 values, except for three sampling points, were characteristic of unpolluted environments, although oil and grease were found in half of the sampled stations. Phytoplankton and zooplankton communities presented high diversity and evenness indices for the entire area. Phytoplankton was dominated by phytoflagel1àtes and zooplankton was dominated by copepods, mostly Paracalanus quasimodo. Plankton community composition was similar to that from adjacent regions under low anthropogenic influence.

Interactive effects of grazing and environmental stress on macroalgal biomass in subtropical rocky shores: Modulation of bottom-up inputs by wave action

“…Average sea surface temperature (SST) within the channel varies from 21°C in winter to 24°C in summer (Silva et al, 2005), and the tidal regime is predominantly semidiurnal, with maximum range around 1.3 m. Air temperature over 35°C is not rare during summer and temperature at the intertidal surface of rocks may exceed 40°C (Kasten and Flores, 2013). Available data on nutrient concentration in coastal waters are limited, but there are strong evidences that overall nutrient availability is very low (usually below 1 μm/l; Gianesella et al, 1999). High-frequency nutrient inputs are expected during summer months due to the intrusion of South-Atlantic Central Waters (SACW; Castro-Filho et al, 1987;Sumida et al, 2005), but a seasonal trend for chlorophyll concentration in shelf waters, with maxima during winter months (Castro-Filho et al, 1987;Ciotti et al, 2010;Sumida et al, 2005), indicates that other nutrient sources than those delivered by SACW may be more relevant.…”

Sticholonche zanclea (Protozoa, Actinopoda) in fecal pellets of copepods and Euphausia sp. in Brazilian coastal waters

“…the funnel-shaped channel is curved along its 25 km length, with the narrowest part (2 km wide) in the center, widening toward both ends to 7.2 km at the southern entrance and 5.6 km at the northern entrance. depths along the channel range from approximately 20 m at the entrances down to 50 m in the middle part (Gianesella et al, 1999). water temperature and salinity vary annually from 18 to °c and 35 to 37‰, respectively.…”

Estrutura da comunidade macrozoobentônica na região de influência do Terminal Almirante Barroso (TEBAR) no Canal de São Sebastião (SP, Brasil)

“…Durante a primavera e verão, esse padrão se altera, quando ocorre um fluxo de duas camadas de água no canal, uma superficial (AC), fluindo para sudoeste (influenciada pelos ventos de NE) e outra de fundo fluindo para nordeste (Gianesella et al, 1999). Esta última não é influenciada pela ação dos ventos e sim pela penetração da Água Central do Atlântico Sul (ACAS), caracterizada por baixas temperaturas (< 18 0 C) e alta salinidade (>36 psu) (Castro Filho et al, 1987).…”

“…Áreas litorâneas urbanizadas uma vez impactadas, podem afetar a saúde humana por um contato direto ou através da cadeia alimentar (Muniz et al, 2006). Dessa forma, diagnósticos ambientais para se avaliar impactos de origem antrópica representam um grande desafio (Gianesella et al, 1999 Sebastião (Gianesella et al, 1999).…”