Papers by CARMEN MEDEIROS
ELAINE DOS SANTOS Acad. do Curso de Ciências ~i o l ó ~i c a s da UFRPE. ELAINE HARTMAN pós-gradu... more ELAINE DOS SANTOS Acad. do Curso de Ciências ~i o l ó ~i c a s da UFRPE. ELAINE HARTMAN pós-graduanda da Univ. o£ Massachusetts EDUARDO MOTTA Acad. do Curso de Eng. de Pesca da UFRPE.
WIT Transactions on Ecology and the Environment, 1970
Plankton dynamics was studied at Itamaraca mangrove to assess the estuarinecoastal interactions. ... more Plankton dynamics was studied at Itamaraca mangrove to assess the estuarinecoastal interactions. Sampling was carried out at the north and south connections with the Atlantic Ocean in 1994, and in two perpendicular profiles toward offshore, in March 1995. Water masses at Itamaraca had an average temperature of 28.6"C; salinities varied from 19.62 to 36.99 and dissolved oxygen was supersaturated at high tide and under 70% saturation at low tide. The Tropical Water Mass characterized the shelf area. High overall nutrient concentrations indicated a eutrophic estuarine area resulting in a high primary productivity (between 2 and 39mgC.h-'.m4) and high chlorophyll-a (mean: 12mg.m") abruptly decreasing offshore. Identified were 78 phytoplankton species to Santa Cruz channel inlets and 102 species to shelf waters. Nitrogen was the limiting factor with a N:P ratio of less than 10: 1. Seventy microzooplankton and 49 macrozooplankton taxa were identified to Santa Cruz inlets while 98 microzooplankton and 86 macrozooplankton taxa occurred in the shelf area; Part of the nutrients and organisms were exported from Itamaraca estuarine system to the adjacent shelf at low tide. It was confirmed that the role of mangrove are source of energy and organisms to estuarine and marine food webs.
WIT Transactions on Ecology and the Environment, 1970
The plankton structure was investigated at the estuary of the River Ipojuca after 1 0 years impla... more The plankton structure was investigated at the estuary of the River Ipojuca after 1 0 years implantation of a Port Complex. Plankton was sampled in one fixed station. Concurrent hydrological, climatological and chlorophyll a data were taken. The course of the river alteration resulted into an estuary that tends to evolves from a classical towards a coastal lagoon type. Chlorophyll a presented low values for an estuarine mangrove area. Plankton high diversity (> 3.0 bits.ind"*) can be explained by the spatial heterogeneity, although a general biodiversity decrease was registered after port implantation. Phytoplankton presented 98 taxa outranking diatoms (72 species). Zooplankton presented 63 taxa outranking rotifers (29 species) and copepods (21 species). Less than 5% of these taxa were very frequent. Irregular fluctuations in plankton densities were observed with a sharp abundance decrease after port implantation. The community was dominated by marine eurihaline species with a high proportion of littoral taxa. Meroplanktonic larval recruitment was reduced by landing and dredging. The anthropic impacts affected the system balance.
Tropical Oceanography
This work evaluated the level of mercury contamination in a mangrove system (Santa Cruz Channel) ... more This work evaluated the level of mercury contamination in a mangrove system (Santa Cruz Channel) a couple of years after Hg discharge into its main tributary (Botafogo River) ceased, as well as the role of mangrove sediments as sinks or secondary sources of mercury whiting the system and/or to coastal areas. Mangrove oysters, suspended matter and sediment cores representing different compartments of the Channel and seasonal and tidal stages were analyzed. Mercury concentrations was 0.27-2.21 ppm (dry mass DM) in mangrove oysters; 0.04-6.20 ppm in total sediment (DM) and 0.3-20.5 ppm in relation to the grain size fraction <63 μm. Mercury concentrations in suspended matter were between 0.43-5.56 ppm (DM), corresponding to 4-175 ngL-1 particulate mercury. Results corroborates the importance of fine and organic-rich matter for the accumulation of mercury but also indicated that mangrove sediments do not function as a long-term trap for Hg. Instead, mercury is remobilized from the sed...
A comparative study of total alkalinity and total inorganic carbon near tropical Atlantic coastal regions
Journal of Coastal Conservation
The effect of urban runoff on hatchability, survival and growth of Pimephales promelas was measur... more The effect of urban runoff on hatchability, survival and growth of Pimephales promelas was measured in 4. 1 Study Area. 15 4.2 Rationale. 20 4.5 Field Collections. 22 A-Assay Water. 23 B-Chemical Analyses.
Tropical Oceanography, 2018
O rio Ipojuca figura dentre os rios Pernambucanos que sofreram maiores alterações em sua geometri... more O rio Ipojuca figura dentre os rios Pernambucanos que sofreram maiores alterações em sua geometria/desembocadura e descargas fluviais. Este estudo enfoca a propagação da maré salina e o regime salino neste sistema. Os trabalhos abrangeram um levantamento morfobatimétrico, obtenção de perfis CTD e medições de correntes em períodos chuvoso (jun-ago/2017) e de estiagem (dez/17) em ciclos de sizígia e quadratura. O estuário é raso (-1,4 a 9,1m) em seus trechos superior e mediano, com profundidade média de 0,5m (0,4-9,5m) e presença de um canal central profundo e de bancos de areia emersos em seu trecho inferior. O estuário é do tipo 1b pelo sistema de classificação de Hansen and Rattray (1966), moderadamente estratificado e lateralmente homogêneo. O transporte salino é governado por processos difusivos, recebendo moderadas a elevadas descargas fluviais no período chuvoso e tendendo a parcialmente estratificado, com baixas entradas de água doce durante o período de estiagem. A excursão d...
This note represents a new register of the oceanic hydrozoa Porpita porpita (Linnaeus, 1758) for ... more This note represents a new register of the oceanic hydrozoa Porpita porpita (Linnaeus, 1758) for the Pernambuco state,
This paper attempts to the hazards assessment and how to manage the hydrodynamic sedimentary proc... more This paper attempts to the hazards assessment and how to manage the hydrodynamic sedimentary processes stemmed from the emplacement of a set of gabions located at the stretch of a beach in Cascavel municipality, Ceará State, Northeast Brazil. The present littoral morphodynamics related to the wave climate, swash and backwash processes and anthropic activities actually held in the area, has been also considered. Top-hydrographic profiles, sediment sampling, and textural analysis all over the year of 2001 have been performed. The results were compared to the previous ones aiming at achieving the state of the art of the coastal hydrodynamics processes and their relationship to the degeneration and/or regeneration of the coastline morphology together with its uses and occupation. The beach zonation have been worked out, different compartments and three cells were calculated which allowed the definition of vulnerability inside in each one of the sectors. The progradation and inverse beac...
Revista Brasileira de Geomorfologia, 2001
Apresentamos neste trabalho os resultados da aplicação do conceito do perfil praial de equilíbrio... more Apresentamos neste trabalho os resultados da aplicação do conceito do perfil praial de equilíbrio proposto por Dean (1977), para a Praia de Serinhaém, PE. Este conceito foi inicialmente empregado em praias com características de tamanhos uniformes de grão, e foi usado satisfatoriamente na Praia de Serinhaém, que apresenta diferentes tamanhos de grão sobre a zona de surfe e a antepraia. O desequilíbrio observado entre o perfil praial medido e o perfil previsto indicam um déficit de sedimentos no sistema praial. Esta interpretação é concordante com o fenômeno erosivo registrado na região costeira em estudos que descrevem o recuo da linha de praia (Manso, 1997). A presença de um banco de arenito de praia além da profundidade de 5 m, sobre a antepraia, pode constituir-se no mecanismo que atua na proteção natural do pós-praia das significativas taxas de erosão, mas sem modificar o resultado do perfil de equilíbrio aplicado à Praia de Serinhaém.
Parameters of the CO2 system in seawater: spatial and seasonal variations in the Tropical Atlantic during REVIZEE Cruises
In this study, we present surface synoptic data of 7 oceanographic cruises (N=852) undertaken bet... more In this study, we present surface synoptic data of 7 oceanographic cruises (N=852) undertaken between March 1995 and September 2001 during the Brazilian Program "REVIZEE/SCORE, North-Northeastern". The partial pressure of CO2 (pCO2) in the seawater, the dissolved inorganic carbon (DIC) and the total alkalinity (TAlk) were calculated using measured temperature, salinity and pH. The temperature and salinity values, which present strong fluctuations (25.5ºC -29.5ºC and 13.2-37.4 units, respectively) showed significant differences (kruskal-wallis; p>0.0001; α=0.05) between the North (NO) and Northeastern (NE) campaigns. TAlk (1,052-2,479 μmol kg -1) and DIC (882-2,084 μmol kg -1) showed spatial variations, mainly due to the influence of the Amazon River discharge. The pCO2 reached 423 μatm in the oceanic region offshore of NE during the boreal winter. The CO2 fluxes (average: -0.6±1.8 mmol m -2 d -1 (range: -11.0 -+ 1.3) present spatial and temporal variations, with negativ...
The Itamaracá Estuarine Ecosystem, Brazil
Ecological Studies, 2001
In northeastern Brazil (7"34'-7"55'S and 34"48'-34'52'W),... more In northeastern Brazil (7"34'-7"55'S and 34"48'-34'52'W), the tropical Ita-maraca estuary system (824 km2) was formed during the early Holocene. A fault which gave origin to the Santa Cruz Channel was flooded by seawater and connected with the South Atlantic Ocean by the ...
Current vanes for measuring tidal currents in estuaries
Estuarine, Coastal and Shelf Science, 1989
Abstract Current vanes used as submerged drags are simple, reliable and inexpensive instruments f... more Abstract Current vanes used as submerged drags are simple, reliable and inexpensive instruments for measuring instantaneous currents in shallow, tidal estuaries. They are superior to current crosses and well-suited for environmental surveys of estuarine current distributions. The vanes have been designed for current measurements in the range 0.1–1.6 m s −1 and have an average standard error of the mean of 0.04–0.06 m s −1 , depending on the choice of current speed range. The drag coefficient for the vane is calculated to vary between 1.39 and 1.48.
Química Nova
Multiple environmental problems are caused by the accumulation of nitrogen (N) and phosphorus (P)... more Multiple environmental problems are caused by the accumulation of nitrogen (N) and phosphorus (P) in river water on its way to the ocean. The objective of this work was to determine the N and P loads in 12 hydrographic basins that flow into estuaries along the northeastern coast of Brazil using established methods. Additionally, natural and anthropogenic loads trends in the hydrographic basins of 12 tropical rivers in northeastern Brazil over 27 years (1990-2016) were evaluated. The results indicated an annual average increase of +1.1% in population density, while precipitation showed no significant trend. The anthropogenic loads were 21 and 112 times higher than natural inputs for N and P, respectively. Anthropogenic sources accounted for ~ 96% of all contributions. The positive trends of these loads (mainly wastewater) represented an annual average increase of 1.1% for N and 1.2% for P, for all river basins included in this study. These percentages represent average annual loads o...
Water Quality in a Tropical Estuarine Channel: Current Conditions, Trends, and Trophic Status (1990–2016)
Water, Air, & Soil Pollution
Long-term water quality conditions and trends in 12 tropical coastal rivers in Northeast Brazil
Environmental Monitoring and Assessment
The water quality and trends in 12 tropical rivers in northeastern Brazil over a 27-year period (... more The water quality and trends in 12 tropical rivers in northeastern Brazil over a 27-year period (1990–2016; N = 39,008 samples) were evaluated. The analyzed parameters included temperature, conductivity, pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), nitrogen (NH4+), total phosphorus (P), and fecal coliforms. Densely populated basins (> 1000 inhab km−2) presented lower DO values (average 3.4 mg l−1; 43% DO saturation), while those with low demographic density (< 100 inhab km−2) presented values that aligned well with the recommendations of environmental legislation (average 5.8 mg l−1; 75% DO saturation). The NH4+ and P compound concentrations were typical of water bodies affected by urban inputs. The average p values were above the allowable limit (< 0.1 mg l−1) at all stations. The NH4+ values were high at the stations showing low DO concentrations, which suggested that due to reducing conditions after NH4+ accumulation was favored in those aquatic systems. In densely populated basins, the average fecal coliform concentrations were > 40,000 MPN 100 ml−1, indicating the input of improperly treated domestic/industrial liquid wastes. For the period from 1990 to 2016, 45% of the stations (N = 19) showed a rate of DO reduction that ranged from 0.01 to 0.17 mg l−1.O2 year−1. An increase in NH4+ concentrations was observed in 33% of the stations (N = 14), with an estimated average increase rate from 0.013 to 1.8 mg l−1 NH4+ year−1. These results demonstrated that the rates of increase in anthropogenic factors were significant (p < 0.05), while the natural factors remained constant.
Frontiers in Marine Science, 2021
The hydrodynamics and the occurrence of topographic upwelling around the northern Brazilian seamo... more The hydrodynamics and the occurrence of topographic upwelling around the northern Brazilian seamount chain were investigated. Meteorological and physical oceanographic data collected under the REVIZEE-NE Program cruises around the Aracati Bank, the major and highly productive seamount in the area, were analyzed and used to force and validate simulations using the 3D Princeton Ocean Model (3D POM). The Tropical Water mass in the top 150-m layer and the South Atlantic Central Water (SACW) beneath it and down to a depth of 670 m was present. The thickness of the barrier layer varied seasonally, being thinner (2 m) during the austral spring (October–December) and thicker (20 m) during the austral autumn (April–June) when winds were stronger. The surface mixed and isothermal layers in the austral winter (July–September) were located at depths of 84 and 96 m, respectively. During the austral spring, those layers were located at depths of 6 and 8 m, respectively. The mean wind shear energy...
Tropical Oceanography, 2020
Filtradores sésseis e bioacumuladores, as ostras são bons indicadores da saúde dos estuários. Alt... more Filtradores sésseis e bioacumuladores, as ostras são bons indicadores da saúde dos estuários. Alteração das características morfológicas de suas conchas e da relação peso de sua carne para o volume de sua concha, etc. refletem a qualidade do ambiente onde vivem. O presente trabalho enfoca uma avaliação das condições da ostra-de-mangue Crassostrea rhizophorae no estuário do rio Ipojuca, um dos mais poluídos do país. Para tanto 80 indivíduos de 4 áreas do estuário foram coletados em jan/2019 (pós-desova) e out/2019 (desova), pesados e mensurados. Com base nesses dados foram calculados os índices de espessamento da concha (STI1) e o índice de qualidade da norma francesa AFNOR. Resultados revelaram por um lado, a ocorrência de ostras comercialmente classificáveis como “finas” e mesmo “especiais” em termos de seu desenvolvimento e preenchimento do espaço intervalvar das mesmas. Por outro lado, baixos valores (< 4) do índice de monitoramento STI1, forte indicador de contaminação por TB...
Seasonal Exchanges of Salt and Suspended Particulates between the Sol Bay and the Pará River, Amazonian Coast
Journal of Coastal Research, 2018
ABSTRACT Mascarenhas, A.C.C.; Correa, A.W.R.; Carneiro, A.C.; Costa, M.S.; Rollnic, M., and Medei... more ABSTRACT Mascarenhas, A.C.C.; Correa, A.W.R.; Carneiro, A.C.; Costa, M.S.; Rollnic, M., and Medeiros, C., 2018. Seasonal Exchanges of Salt and Suspended Particulates between the Sol Bay and the Pará River, Amazonian Coast. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 111–115. Coconut Creek (Florida), ISSN 0749-0208. Salt and suspended particulate matter (SPM) exchange between the Sol Bay and the Pará River and their tidal/seasonal variability was investigated along the interface cross-section (1°4′30.37″S 48°19′37.48″W), over spring tidal cycles, during the wet (Apr/2015) and dry (Oct/2015) seasons. Advective transport of salt and SPM was analyzed to evaluate trends and contributions of involved mechanism. Overall, salinity was low (S<2) during dry and absent during the wet season. Mean SPM concentrations where higher at flood tides during both seasons. Higher flow velocities were 1.29 m.s−1 (ebb/wet) and 1.17 m.s−1 (flood/dry). During the dry season net salt transport was 8.10 kg.s−1 seawards mainly due to a baywards Stokes drift transport (−193.7 kg.s−1) against a seawards transport by the river discharge, tidal correlation and turbulent shear components (+179.0; +11.98; +7.72 kg.s−1). However, SPM was stored into Sol Bay at a rate of 2.06 kg.s−1 (90 ton per tidal cycle), as result of the baywards transport by the Stokes drift+river discharge (−3.14; −0.82 kg.s−1) in opposition to the seawards transport due to gravitational circulation+tidal correlation components (+1.69; +0.48 kg.s−1). During the wet season the river discharge (29.8 kg.s−1) fluxes out SPM from Sol Bay while the Stokes drift (3.19 kg.s−1) and the turbulent shear (0.65 kg.s−1) components tends to move SPM back into the bay with a net exportation of SPM to the Pará River of 26 kg.s−1 (129.8 ton per tidal cycle). In conclusion, matter exchange between the Sol Bay and the Pará River is mainly governed by the river discharge and Stokes drift flow components. The relative contributions by the gravitation circulation, tidal correlation and turbulent shear tend to increase under low river discharge. A small salt exportation (+8.10 kg.s−1) during the dry season
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Papers by CARMEN MEDEIROS