Results 31 to 40 of about 1,121,101 (230)

Effects of a large irrigation reservoir on aquatic and riparian plants: a history of survival and loss [PDF]

open access: yes, 2019
Dammed rivers have unnatural stream flows, disrupted sediment dynamics, and rearranged geomorphologic settings. Consequently, fluvial biota experiences disturbed functioning in the novel ecosystems.
Aguiar, Francisca C.   +3 more
core   +1 more source

Biomarkers in Nereis diversicolor (Polychaeta: Nereididae) as management tools for environmental assessment on the southwest Iberian coast

open access: yesScientia Marina, 2013
The environmental quality of the southwest Iberian coast was assessed in different areas (Ria Formosa Lagoon, Guadiana Estuary and Cádiz Bay) focusing on metal contamination (Cd, Cu, Ni, Pb and Zn) in Nereis diversicolor whole tissues.
Tânia Gomes   +6 more
doaj   +1 more source

The distribution of estuarine fish larvae: nutritional condition and co-occurrence with predators and prey [PDF]

open access: yes, 2000
Fish larvae were collected monthly between March and September 1997 in the Mira and Guadiana estuaries (southern Portugal). Hydrological parameters were registered and zooplankton samples were obtained simultaneously. Densities of fish larvae (ind.100 m(-
Antunes   +82 more
core   +2 more sources

Sources, background and enrichment of lead and other elements: Lower Guadiana River [PDF]

open access: yesGeoderma, 2013
Abstract The lower sector of the Guadiana River Basin, located in southern Portugal and Spain, hosts soils and plants with elevated Pb, Cu and As near former and current mining sites. Two geogenic and two anthropogenic sources of Pb were identified where elevated concentrations are mostly related to the occurrence of sulphide-rich ore deposits ...
M. Batista   +7 more
semanticscholar   +3 more sources

Influence of reservoir management on Guadiana streamflow regime

open access: yesJournal of Hydrology: Regional Studies, 2019
Study region: Guadiana international catchment, located in the Iberian Peninsula. Study focus: The Guadiana River catchment has registered an intense and speed up modification of its natural regime over the last few decades to cope with water scarcity ...
Nelson Canuto   +5 more
doaj   +1 more source

Mito-nuclear sequencing is paramount to correctly identify sympatric hybridizing fishes [PDF]

open access: yesActa Ichthyologica et Piscatoria, 2018
Background. Hybridization may drive speciation and erode species, especially when intrageneric sympatric species are involved. Five sympatric Luciobarbus species—Luciobarbus sclateri (Günther, 1868), Luciobarbus comizo (Steindachner ...
C. Sousa-Santos   +8 more
doaj   +3 more sources

Cross-Comparison of Climate Change adaptation Strategies Across Large River Basins in Europe, Africa and Asia [PDF]

open access: yes, 2010
A cross-comparison of climate change adaptation strategies across regions was performed, considering six large river basins as case study areas. Three of the basins, namely the Elbe, Guadiana, and Rhine, are located in Europe, the Nile Equatorial Lakes ...
Blanco, I.   +17 more
core   +4 more sources

Current status of las tablas de daimiel national park wetland and actions required for conservation [PDF]

open access: yes, 2019
Wetlands are complex ecosystems that play multiple roles. ‘Las Tablas de Daimiel National Park’ (TDNP) undoubtedly plays a role in several ecosystem services and provides a connection between nature, farmers, scientists, residents, and other stakeholders.
Bravo-Martin, Sandra   +3 more
core   +2 more sources

A new Tongue-orchid (Orchidaceae) in southwest Spain: Serapias occidentalis

open access: yesAnales del Jardín Botánico de Madrid, 2006
Serapias occidentalis is described from several populations (Campo Lugar, Obando and Aljucén) scattered over the Guadiana river basin in Extremadura, Spain.
Caspar Venhuis   +2 more
doaj   +1 more source

Assessment of trace element pollution and its environmental risk to freshwater sediments influenced by anthropogenic contributions: The case study of Alqueva reservoir (Guadiana Basin) [PDF]

open access: yes, 2015
The Guadiana Basin.(SW Iberian Peninsula) is affected by acid mine drainage (AMD), a consequence of ancient mining activities in the Iberian Pyrite Belt (IPB).
Alvarenga, Paula   +2 more
core   +1 more source

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