Consulta: creatorFacets:"Pastor, L."
Registros recuperados: 6
Data/hora: 02/06/2024 03:26:08

Seasonal dynamics of carbon recycling in coastal sediments influenced by rivers: assessing the impact of flood inputs in the Rhône River prodelta
Provedor de dados: 5
Autores: Cathalot, C.; Rabouille, C.; Pastor, L.; Deflandre, B.; Viollier, E.; Buscail, R.; Treignier, C.; Pruski, A.
The biogeochemical fate of the particulate organic inputs from the Rhône River was studied on a seasonal basis by measuring sediment oxygen uptake rates in the prodelta, both during normal and flood regimes. On a selected set of 10 stations in the prodelta and nearby continental shelf, in situ and laboratory measurements of sediment oxygen demand were performed in early spring and summer 2007 and late spring and winter 2008. In and ex situ sediment Diffusive Oxygen Uptakes (DOU) did not show any significant differences except for shallowest organic rich stations. DOU rates show highest values concentrated close to the river mouth (approx. 20 mmol O2 m-2 d-1) and decrease offshore to values around 4.5 mmol O2 m-2 d-1 preferentially in a south west...
Tipo: Text
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00303/41428/40611.pdf

The fate of river organic carbon in coastal areas: A study in the Rhone River delta using multiple isotopic (delta C-13, Delta C-14) and organic tracers
Provedor de dados: 5
Autores: Cathalot, Cecile; Rabouille, Christophe; Tisnerat-laborde, N.; Toussaint, Flora; Kerherve, P.; Buscail, R.; Loftis, K.; Sun, M. -y.; Tronczynski, Jacek; Azoury, S.; Lansard, Bruno; Treignier, Claire; Pastor, L.; Tesi, T.
A significant fraction of the global carbon flux to the ocean occurs in River-dominated Ocean Margins (RiOMar) although large uncertainties remain in the cycle of organic matter (OM) in these systems. In particular, the OM sources and residence time have not been well clarified. Surface (0-1 cm) and sub-surface (3-4 cm) sediments and water column particles (bottom and intermediate depth) from the Rhone River delta system were collected in June 2005 and in April 2007 for a multi-proxy study. Lignin phenols, black carbon (BC), proto-kerogen/BC mixture, polycyclic aromatic hydrocarbons (PAHs), carbon stable isotope (delta C-13(OC)), and radiocarbon measurements (delta C-14(OC)) were carried out to characterize the source of sedimentary organic material and to...
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00157/26784/25673.pdf

Modeling biogeochemical processes in sediments from the Rhone River prodelta area (NW Mediterranean Sea)
Provedor de dados: 5
Autores: Pastor, L.; Cathalot, C.; Deflandre, B.; Viollier, E.; Soetaert, K.; Meysman, F. J. R.; Ulses, C.; Metzger, E.; Rabouille, C.
In situ oxygen microprofiles, sediment organic carbon content, and pore-water concentrations of nitrate, ammonium, iron, manganese, and sulfides obtained in sediments from the Rhone River prodelta and its adjacent continental shelf were used to constrain a numerical diagenetic model. Results showed that (1) the organic matter from the Rhone River is composed of a fraction of fresh material associated to high first-order degradation rate constants (11-33 yr(-1)); (2) the burial efficiency (burial/input ratio) in the Rh boolean AND one prodelta (within 3 km of the river outlet) can be up to 80 %, and decreases to similar to 20% on the adjacent continental shelf 10-15 km further offshore; (3) there is a large contribution of anoxic processes to total...
Tipo: Text
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00303/41423/40614.pdf

Temporal variability of carbon recycling in coastal sediments influenced by rivers: assessing the impact of flood inputs in the Rhone River prodelta
Provedor de dados: 5
Autores: Cathalot, C.; Rabouille, C.; Pastor, L.; Deflandre, B.; Viollier, E.; Buscail, R.; Gremare, A.; Treignier, C.; Pruski, A.
River deltas are particularly important in the marine carbon cycle as they represent the transition between terrestrial and marine carbon: linked to major burial zones, they are reprocessing zones where large carbon fluxes can be mineralized. In order to estimate this mineralization, sediment oxygen uptake rates were measured in continental shelf sediments and river prodelta over different seasons near the outlet of the Rhone River in the Mediterranean Sea. On a selected set of 10 stations in the river prodelta and nearby continental shelf, in situ diffusive oxygen uptake (DOU) and laboratory total oxygen uptake (TOU) measurements were performed in early spring and summer 2007 and late spring and winter 2008. In and ex situ DOU did not show any significant...
Tipo: Text
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00303/41427/40610.pdf

Características biológicas de cinco especies de peces marinos ornamentales.
Provedor de dados: 20
Autores: Pastor, L.
Se presentan los resultados del estudio biológico de cinco especies de peces ornamentales, a los que se les concede un alto valor para su exhibición en los acuarios. Las especies se caracterizaron morfométricamente con mediciones lineales y del peso, relaciones proporcionales y la relación largo-peso; y se estudió la reproducción y la alimentación. La especie Gramma loreto se caracterizó morfométricamente; los individuos maduros resultaron más altos proporcionalmente; predominaron las hembras en la proporción sexual total; la madurez sexual se presentó en la clase de talla de 35-40 mm en las hembras y de 55-60 mm de LH en los machos; en marzo-abril se puede estimar su período reproductivo; los crustáceos, y dentro de ellos los copépodos harpacticoides...
Tipo: Theses and Dissertations
Palavras-chave: Ornamental fish; Tropical fish.
Ano: 2000
URL: http://hdl.handle.net/1834/4593

Caballitos de mar, joyas en peligro.
Provedor de dados: 20
Autores: Pérez, A.; de la Nuez, D.; Piloto, Y.; Pastor, L.; González, E.
De forma breve se describe la biología de la especie, hábitats, distribución geográfica, su reproducción, la situación en cuanto a CITES y a la Lista  Roja de UICN, y,  para concluir lugares de Cuba en los cuales se estudian las especies que habitan en las costas del país.
Tipo: Journal Contribution
Palavras-chave: 1341; Tropical fish.
Ano: 2009
URL: http://hdl.handle.net/1834/5232