Results 41 to 50 of about 1,121,101 (230)

Geochemical characterization of surficial sediments from the southwestern Iberian continental shelf

Ciencias Marinas, 2005
The impact of trace elements (Ba, Nb, Zr, Y, Sr, Rb, Pb, As, Zn, Cu, Ni, Co, Cr, V, La, Ce, Nd, Sm, Eu, Tb, Yb and Lu) transported by the Guadiana, Tinto-Odiel and Guadalquivir rivers on sediments from the southwestern Iberian continental shelf has been
A Machado, F Rocha, MF Araújo, F Vitali, C Gomes, JA Dias   +5 more
doaj   +1 more source

New chalcolithic anthropomorphic idols from the middle Guadiana basin [PDF]

, 2000
Se presentan cinco nuevas cabezas de ídolos antropomorfos calcolíticos de caliza marmórea y diversos fragmentos de otros, que proceden de cuatro yacimientos enclavados en la cuenca media del Guadiana. Junto a ellos un nuevo ídolo casi completo encontrado
Enríquez Navascués, Juan Javier
core   +1 more source

Human pressures on two estuaries of the Iberian Peninsula are reflected in food web structure [PDF]

, 2019
As a result of the increased urban and agricultural development in coastal environments, estuaries are among the most modified and threatened aquatic ecosystems.
Donázar Aramendía, Iñigo Javier, García Asencio, Isabel, García Gómez, José Carlos, Megina Martínez, César, Miró Recio-Mensaque, Juan Miguel, Sánchez Moyano, Juan Emilio   +5 more
core   +1 more source

El fondeadero romano de Isla del Moral y el comercio marítimo en la desembocadura del Guadiana

Espacio, Tiempo y Forma. Serie II, Historia Antigua, 2014
En este trabajo se presentan los resultados de la prospección arqueológica subacuática llevada a cabo en el Río Carreras (Ayamonte, Huelva, España) con motivo de su dragado.
Juan Aurelio Pérez Macías, Diego González Batanero, Manuel Javier Rodríguez Martín   +2 more
doaj   +1 more source

Comparison of the fatty acid profile of muscle neutral lipids and phospholipids of up-river anadromous sea lamprey (Petromyzon marinus L.) from three Portuguese river basins

Scientia Marina, 2009
Composition of fatty acid profile of muscle neutral lipids (NL) and phospholipids (PL) of sea lamprey that enter the Portuguese rivers Minho, Tagus and Guadiana during their non-trophic spawning migration was analysed.
Sara Pinela, Bernardo Ruivo Quintella, Pedro Raposo de Almeida, Maria João Lança   +3 more
doaj   +1 more source

Investigating population structure of Sea Lamprey (Petromyzon marinus, L.) in Western Iberian Peninsula using morphological characters and heart fatty acid signature analyses. [PDF]

PLoS ONE, 2014
This study hypothesizes the existence of three groups of sea lamprey Petromyzon marinus L. in Portugal (North/Central group, Tagus group, and Guadiana group), possibly promoted by seabed topography isolation during the oceanic phase of the life cycle ...
Maria João Lança, Maria Machado, Catarina S Mateus, Marta Lourenço, Ana F Ferreira, Bernardo R Quintella, Pedro R Almeida   +6 more
doaj   +1 more source

Mapping Invasive Aquatic Plants in Sentinel-2 Images Using Convolutional Neural Networks Trained With Spectral Indices

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023
Multispectral images collected by the European Space Agency's Sentinel-2 satellite offer a powerful resource for accurately and efficiently mapping areas affected by the distribution of invasive aquatic plants.
Elena Cristina Rodriguez-Garlito, Abel Paz-Gallardo, Antonio Plaza   +2 more
doaj   +1 more source

Critically endangered species facing range retreats are not necessarily genetically depleted: the case of the endemic freshwater fish Anaecypris hispanica (Steindachner, 1866)

Frontiers in Marine Science, 2015
Assessing genetic diversity levels and population structure is fundamental for conservation and management of highly threatened species. In this study we use mitochondrial and nuclear markers to address phylogeographic and demographic data on the ...
Carla Sousa-Santos, Joana Isabel Robalo, Carlos Carrapato, Ignacio Doadrio   +3 more
doaj   +1 more source

River damming leads to decreased phytoplankton biomass and disappearance of cyanobacteria blooms [PDF]

, 2014
The large Alqueva dam was built in the early 2000s in the Guadiana River (southern Portugal) and has highly controlled the freshwater flowing into the Guadiana estuary, leading to significant changes in the natural hydrological regime.
Barbosa, Ana B., Domingues, Rita B., Galvão, Helena M.   +2 more
core   +1 more source

Effects of tidal-forcing variations on tidal properties along a narrow convergent estuary [PDF]

, 2018
A 1D analytical framework is implemented in a narrow convergent estuary that is 78 km in length (the Guadiana, Southern Iberia) to evaluate the tidal dynamics along the channel, including the effects of neap-spring amplitude variations at the mouth.
AJF Hoitink, AS Chernetsky, CT Friedrichs, CT Friedrichs, D Prandle, D Prandle, D Prandle, DA Jay, DA Jay, DA Jay, DA Jay, DA Jay, DL Codiga, E Flinchem, E Garel, E Garel, E Garel, E Garel, EF Zhang, Erwan Garel, GB Pillsbury, HHG Savenije, HM Schuttelaars, Huayang Cai, Huayang Cai, Huayang Cai, JC Winterwerp, JJ Dronkers, JM Lincoln, JN Hunt, KR Dyer, L Guo, LC Rijn Van, LS Quaresma, M. Díez-Minguito, MA Teodosio, MG Sassi, MJ Park, R. Familkhalili, S Lanzoni, SR Shetye, ZB Wang   +41 more
core   +1 more source