Navigation Links
Heavy metals and pesticides threaten a Huelva wetland
Date:1/14/2011

The Estero de Domingo Rubio wetland, located near the Marismas del Odiel Natural Area in the Huelva estuary, is regionally, nationally and internationally protected thanks to its ecological value. However, its tributary rivers and the Ra de Huelva estuary pump manmade pollutants into it, which could affect its water quality and ecosystem.

Industrial activity, accumulations of dangerous waste, the expansion of farming, and excessive extraction of sand and gravel for the construction industry are the leading threats to the Estero de Domingo Rubio wetland, the tidal system of which plays a "crucial" role in transporting and dispersing pollutants.

The wetland is "periodically flooded with high levels of dissolved elements such as copper (Cu), arsenic (As), cadmium (Cd), cobalt (Co), chrome (Cr), nickel (Ni) and zinc (Zn), which come from the water entering the estuary, which is affected by pollution from the mining industry", Cinta Barba-Brioso, co-author of the study and a researcher at the University of Seville (US), tells SINC.

The study, which has recently been published in the Marine Pollution Bulletin, shows that the wetland's tidal channel also receives acid lixiviates (liquid pollutants) that come from the dumping of sulphurous waste, industrial waste outflow pipes, and abandoned chemical plants, which all contribute to its metallic "enrichment".

Barba-Brioso says: "Agriculture is another significant source of diffuse contamination in the wetland" with nitrates and phosphates entering through agricultural runoff. "Domingo Rubio also receives inflows of phosphates from the Huelva estuary from the phosphogypsum stacks on the right hand banks of the Tinto river", the researcher explains.

Agriculture also generates pesticide concentrations in the water that "generally exceed the vulnerability levels set for wetlands by the European Commission (CCEE)", she stresses. "This contamination by agrochemicals could be prevented if there was greater control over the inflow of herbicides and fertilisers".

An altered ecosystem

Previous studies have used molecular biomarkers to document the biological consequences of pollution in the area and its effects on soils and plants in the wetland region.

To this must be added the alteration to local hydrodynamics, which has "a negative effect on the ecosystem, modifies the natural levels of heavy elements in it, and puts the wildlife communities that live in it at risk", points out Barba-Brioso.

The construction of roads has formed hydrological barriers in the upper parts of the Estero de Domingo Rubio, meaning the wetland now has two distinct hydrological and environmental areas one marshland zone, with abundant halophile vegetation (characteristic of saline soils), and a lagoon zone with aquatic and riverbank vegetation.

"Both of these zones are drained by a network of ephemeral tributaries, which are affected by intensively irrigated crops and industrial activities", the researcher says. The lagoon area and the streams in the river basin are "also affected by the lixiviates from this intensive agriculture, above all from the strawberry farming that is carried out in the area", the scientist explains.

However, the researchers say that hydrological restoration and environmental improvement work is currently being carried out in the area of the Estero lagoon by the Junta de Andaluca regional government and the European Union by means of the European Regional Development Fund.


'/>"/>

Contact: SINC
info@plataformasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert  

Related biology news :

1. Heavy metals accumulate more in some mushrooms than in others
2. Study shows transfer of heavy metals from water to fish in Huelva estuary
3. Heavy pyridine crystallizes differently
4. Gaining too much weight during pregnancy nearly doubles risk of having a heavy baby
5. Microbial worlds use of metals mostly unmapped
6. Coastal birds carry toxic ocean metals inland
7. MU researcher uses bacteria to make radioactive metals inert
8. Microscope reveals how bacteria breathe toxic metals
9. Mechanisms of juvenile hormone action in insects could help fine tune pesticides
10. Prenatal exposure to pesticides linked to attention problems
11. Organic pesticides not always greener choice, study finds
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Heavy metals and pesticides threaten a Huelva wetland
(Date:3/15/2016)... 2016 --> --> ... Market Research "Digital Door Lock Systems Market - Global Industry ... the global digital door lock systems market in terms of ... is forecast to grow at a CAGR of 31.8% during ... medium enterprises (MSMEs) across the world and high industrial activity ...
(Date:3/11/2016)... --> --> ... Recognition Market by Technology (Pattern Recognition), by Component (Hardware, ... Type (On-Premises and Cloud), by Industry Vertical and by ... the global market is expected to grow from USD ... 2020, at a CAGR of 19.1%. , ...
(Date:3/9/2016)... BEACH GARDENS, Fla. , March 9, 2016 ... identity management authentication and enrollment solutions, today announced ... DigitalPersona ® Altus multi-factor authentication ... IT and InfoSec managers to step-up security where ... Washington, DC . ...
Breaking Biology News(10 mins):
(Date:5/24/2016)... , May 24, 2016   MedyMatch Technology Ltd ... with artificial intelligence, real-time decision support tools in the emergency ... at the 2016 Israeli Advanced Technology Industries (IATI) BioMed Conference. ... Israel,s 15th National Life Sciences and Technology ... the David Intercontinental Hotel in Tel Aviv, Israel ...
(Date:5/24/2016)... ... May 24, 2016 , ... ... re-branded identity. The new Media Cybernetics corporate branding reflects a results-driven revitalization for ... and image analysis. The re-branding components include a crisp, refreshed logo and a ...
(Date:5/23/2016)... Willoughby, Ohio (PRWEB) , ... May 23, 2016 ... ... Six Trends That Will Drive Precision Farming in 2017 and Beyond. The paper ... and practitioners in the precision ag industry. , “We’ve witnessed a lot of ...
(Date:5/23/2016)... 23, 2016 Oxitec CEO Hadyn ... at 10:15 a.m. ET before the United States House Committee ... mosquitos can play in controlling the spread of the ... virus.      (Logo: http://photos.prnewswire.com/prnh/20150630/227348 ) ... a self-limiting gene. Trials in Brazil , ...
Breaking Biology Technology: