scholarly journals ANALYSIS OF PARTICULATE ORGANIC MATTER IN HOLOCENE SEDIMENTS OF COASTAL PLAIN FROM PERO BEACH, CABO FRIO, RIO DE JANEIRO, BRAZIL

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Taísa Camila Silveira de Souza ◽  
Marcelo De Araujo Carvalho ◽  
Fabio Ferreira Dias ◽  
Cintia Ferreira Barreto ◽  
Alex Da Silva de Freitas ◽  
...  
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Coastal Plain ◽  
Rio De Janeiro ◽  
Holocene Sediments ◽  
Cabo Frio

scholarly journals Feeding habits of Chironomid larvae (Insecta: Diptera) from a stream in the Floresta da Tijuca, Rio de Janeiro, Brazil

2003 ◽  
Vol 63 (2) ◽  
pp. 269-281 ◽  
Author(s):  
A. L. Henriques-Oliveira ◽  
J. L. Nessimian ◽  
L. F. M. Dorvillé
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Rio De Janeiro ◽  
Feeding Habits ◽  
Gut Contents ◽  
Chironomid Larvae ◽  
Main Food ◽  
Animal Remains ◽  
Aquatic Food ◽  
Main Food Source

Chironomids larvae are frequently one of the most abundant and diverse groups of insects in several kinds of aquatic environments. Also, they play a major role in the aquatic food webs, representing a major link among producers and secondary consumers. This work investigates the feeding behavior of the chironomid larvae present in the Rio da Fazenda, situated in the Parque Nacional da Tijuca, Rio de Janeiro, Brazil, between August 1994 and May 1995. Algae, fungi, pollen, leaf and wood fragments, animal remains, detritus and silt were the main gut contents found in the larvae studied. The main food item ingested by the larvae was detritus, except for the Stenochironomus whose main food source was leaf and wood fragments. Tanypodinae exhibited a large quantity of animal remains of several kinds in the diet. During the period studied it was observed that the diet of 16 genera (out of 24 studied) varied. Tanypodinae had mainly coarse particulate organic matter (> 1 mm) in the gut contents, while Chironominae and Orthocladiinae had fine particulate organic matter (< 1 mm).

scholarly journals Assembleia de Moluscos da Região do Pântano do Ramalho, Cabo Frio, RJ: Indicadores Biológicos de Variação do Nível Relativo do Mar Durante o Holoceno

2011 ◽  
Vol 34 (2) ◽  
pp. 46-52
Author(s):  
Aline Meneguci da Cunha ◽  
Fábio Ferreira Dias ◽  
Vera Maria Medina da Fonseca ◽  
João Wagner de Alencar Castro
Keyword(s):  
Sea Level ◽  
Coastal Plain ◽  
Rio De Janeiro ◽  
Wide Distribution ◽  
Northern Coast ◽  
Mollusk Shells ◽  
Low Degree ◽  
Absolute Dating ◽  
Dating Method ◽  
Cabo Frio

In the coastal plain of the Una river, county of the Cabo Frio, the northern coast of the State of Rio de Janeiro, are found biological evidences of change in relative sea level during the Holocene, represented by dense accumulations and wide distribution composed predominantly of mollusk shells. This paper aims to describe a new occurrence of accumulation of mollusk shells in the region of Ramalho's marsh, coastal plain of the Una river. The study area is located within the Portal de Buzios condominium, Amaral Peixoto Highway (RJ-106) at Km 125 between the coordinates 42º03'29"W and 22 º44'53"S. The survey of altimetry database shells was performed by tracking DGPS Pro Mark 2. To perform the taxonomic analysis, paleoecological, and geochronological were collected approximately 1.75 dm³ of mollusk shells in a trench of 0.50 cm, excavated at the edge of a small dam in the area of the Portal de Búzios condominium. Approximately 100 grams of the specie Anomalocardia brasiliana shells were sent to the absolute dating method radicarbon to Beta Analytic Inc., Miami - USA. Data obtained from a DGPS Pro Mark 2 show an altitude of 0,90 m above actual sea level. Only three species of mollusks were identified in this filing: Anomalocardia brasiliana, Lucina pectinata and Crassostrea rizophorae. A. brasiliana and L. pectinata have not joined infaunal habit, live in muddy or sandy bottoms. C. rizophorae epifaunal habit has stuck, living in rocky and gravel substrata. The three species have water depths ranging from 0 to 30 m depth. Most of the shells found present a low degree of fragmentation and corrosion, indicating little or none transportation. Some shells of L. pectinata and A. brasiliana are articulated, and the shells of C. rizophorae are embedded in the shells of other species. The conventional age of the deposit is 5780 À 70 years BP, calibrated by CALIB 5.0 program in 5997-6333 cal. years BP. These data are similar ages found in deposits along the northern coast of Rio de Janeiro state, Brazil.

Relating particulate organic matter-nitrogen (POM-N) and non-POM-N with pulse crop residues, residue management and cereal N uptake

Agronomie ◽  
2002 ◽  
Vol 22 (7-8) ◽  
pp. 777-787 ◽  
Author(s):  
Graeme D. Schwenke ◽  
Warwick L. Felton ◽  
David F. Herridge ◽  
Dil F. Khan ◽  
Mark B. Peoples
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Crop Residues ◽  
N Uptake ◽  
Residue Management ◽  
Pulse Crop

Macrophyte-derived detritus in shallow coastal waters contributes to suspended particulate organic matter and increases growth rates of Mytilus edulis

2020 ◽  
Vol 644 ◽  
pp. 91-103
Author(s):  
D Bearham ◽  
MA Vanderklift ◽  
RA Downie ◽  
DP Thomson ◽  
LA Clementson
Keyword(s):  
Organic Matter ◽  
Mytilus Edulis ◽  
Particulate Organic Matter ◽  
Coastal Waters ◽  
Gill Tissue ◽  
Suspension Feeder ◽  
Food Sources ◽  
Suspension Feeders ◽  
Blue Mussels ◽  
Suspended Particulate

Benthic suspension feeders, such as bivalves, potentially have several different food sources, including plankton and resuspended detritus of benthic origin. We hypothesised that suspension feeders are likely to feed on detritus if it is present. This inference would be further strengthened if there was a correlation between δ13C of suspension feeder tissue and δ13C of particulate organic matter (POM). Since detritus is characterised by high particulate organic matter (POC):chl a ratios, we would also predict a positive correlation between POM δ13C and POC:chl a. We hypothesised that increasing depth and greater distance from shore would produce a greater nutritional reliance by experimentally transplanted blue mussels Mytilus edulis on plankton rather than macrophyte-derived detritus. After deployments of 3 mo duration in 2 different years at depths from 3 to 40 m, M. edulis sizes were positively correlated with POM concentrations. POC:chl a ratios and δ13C of POM and M. edulis gill tissue decreased with increasing depth (and greater distance from shore). δ13C of POM was correlated with δ13C of M. edulis. Our results suggest that detritus comprised a large proportion of POM at shallow depths (<15 m), that M. edulis ingested and assimilated carbon in proportion to its availability in POM, and that growth of M. edulis was higher where detritus was present and POM concentrations were higher.

Hydrolysis of organic wastewater particles in laboratory scale and pilot scale biofilm reactors under anoxic and aerobic conditions

1998 ◽  
Vol 38 (8-9) ◽  
pp. 179-188 ◽  
Author(s):  
K. F. Janning ◽  
X. Le Tallec ◽  
P. Harremoës
Keyword(s):  
Organic Matter ◽  
Mass Balance ◽  
Particulate Organic Matter ◽  
Removal Rate ◽  
Pilot Scale ◽  
Laboratory Scale ◽  
Synthetic Wastewater ◽  
Aerobic Conditions ◽  
Biofilm Reactors ◽  
Hydrolysis Of

Hydrolysis and degradation of particulate organic matter has been isolated and investigated in laboratory scale and pilot scale biofilters. Wastewater was supplied to biofilm reactors in order to accumulate particulates from wastewater in the filter. When synthetic wastewater with no organic matter was supplied to the reactors, hydrolysis of the particulates was the only process occurring. Results from the laboratory scale experiments under aerobic conditions with pre-settled wastewater show that the initial removal rate is high: rV, O2 = 2.1 kg O2/(m3 d) though fast declining towards a much slower rate. A mass balance of carbon (TOC/TIC) shows that only 10% of the accumulated TOC was transformed to TIC during the 12 hour long experiment. The pilot scale hydrolysis experiment was performed in a new type of biofilm reactor - the B2A® biofilter that is characterised by a series of decreasing sized granular media (80-2.5 mm). When hydrolysis experiments were performed on the anoxic pilot biofilter with pre-screened wastewater particulates as carbon source, a rapid (rV, NO3=0.7 kg NO3-N/(m3 d)) and a slowler (rV, NO3 = 0.3 kg NO3-N/(m3 d)) removal rate were observed at an oxygen concentration of 3.5 mg O2/l. It was found that the pilot biofilter could retain significant amounts of particulate organic matter, reducing the porosity of the filter media of an average from 0.35 to 0.11. A mass balance of carbon shows that up to 40% of the total incoming TOC accumulates in the filter at high flow rates. Only up to 15% of the accumulated TOC was transformed to TIC during the 24 hour long experiment.

INVESTIGATION OF THE INTERNAL STRUCTURE AND EVOLUTION OF THE HOLOCENE BARRIER OF MARICÁ (RIO DE JANEIRO)

2016 ◽  
Vol 33 (3) ◽  
Author(s):  
Carolina Pereira Silvestre ◽  
André Luiz Carvalho da Silva ◽  
Maria Augusta Martins da Silva ◽  
Amilsom Rangel Rodrigues
Keyword(s):  
Internal Structure ◽  
Coastal Plain ◽  
Rio De Janeiro ◽  
The Holocene

ABSTRACT. The objective of this study is the identification of the internal structure of the Holocene barrier of the Maricá coastal plain (Rio de Janeiro) for the understanding of the... RESUMO. O presente estudo objetivou identificar a estrutura interna da barreira holocênica buscando compreender a evolução da planície costeira de Maricá (Rio de Janeiro). A geomorfologia regional...

TURNOVER OF FLUVIAL PARTICULATE ORGANIC MATTER: THE ROLES OF SEDIMENT RESIDENCE TIME AND MICROBIOTA

2019 ◽  
Author(s):  
Marisa Repasch ◽  
◽  
Joel Scheingross ◽  
Joel Scheingross ◽  
Carolin Zakrzewski ◽  
...  
Keyword(s):  
Organic Matter ◽  
Residence Time ◽  
Particulate Organic Matter
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