Corrigendum to “Identification of contaminants of concern in the upper Tagus river basin (central Spain). Part 1: Screening, quantitative analysis and comparison of sampling methods” [Sci. Total Environ. Volume 666 (2019), 1058–1070]

In the Upper Colorado River Basin, agriculture is a major contributor to Utah’s economy, which may be stressed due to the changing climate. In this study, two data-mining techniques and interview data are used to explore how climate variability affects agricultural production and the way the farmers have been adapting their practices to these changes. In the first part of the study, we used multilinear regression and random forest regression to understand the relationship between climate and agricultural production using temperature, precipitation, water availability, hay production, and cattle herd size. The quantitative results showed weak relations among variables. In the second part of the study, we interviewed ranchers to fill the gaps in the quantitative analysis. Over the 35 years (1981–2015), the quantitative analysis shows that temperature has affected cattle and hay production more than precipitation. Among non-climatic variables, resource availability and commodity prices are the most important factors that influence year-to-year production. Farmers are well-aware of these effects and have adapted accordingly. They have changed irrigation practices, cropping patterns, and are experimenting to produce a hybrid species of cattle, that are resilient to a hotter temperature and can use a wider variety of forage.

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Os sobreirais da bacia ceno-antropozóica do Tejo (Província Lusitano-Andaluza Litoral), Portugal.

Acta Botanica Malacitana ◽

10.24310/abm.v32i0.7036 ◽

2007 ◽

Vol 32 ◽

pp. 201-210 ◽

Cited By ~ 1

Author(s):

Carlos Neto ◽

José Carlos Costa ◽

Jorge Capelo ◽

Natália Gaspar ◽

Tiago Monteiro-Henriques

Keyword(s):

Key Words ◽

River Basin ◽

Human Activities ◽

Quercus Suber ◽

Potential Vegetation ◽

Tagus River ◽

Sand Particles ◽

Quercus Suber Woodlands ◽

Major Factors ◽

Vegetation Series

RESUMO. Os sobreirais da bacia ceno-antropozóica do Tejo (Província Lusitano-Andaluza Litoral),Portugal. A análise das características das formações litológicas de enchimento da Bacia do Tejo,com idades que vão do Miocénico ao Plistocénico, permitiu compreender melhor o mosaico desobreirais potenciais, pertencentes respectivamente ao Oleo sylvestris-Quercetum suberis e aoAsparago aphylli-Quercetum suberis. A composição granulométrica, a coesão das partículas e o efeitoda acção antrópica sobre as formações litológicas são os factores fundamentais que intervêm nadistribuição dos dois sobreirais potenciais e nas respectivas etapas subseriais. A acção antrópica sobreas formações areníticas promove a libertação e a acumulação de areias. Este processo permite aentrada de espécies psamofílicas e desta forma a vegetação potencial primitiva (Asparago aphylli-Quercetum suberis) é substituída pela série psamofílica do sobreiro (Oleo sylvestris-Quercetumsuberis).Palavras-chave. Tejo, formações litológicas, sobreirais, séries de vegetação, Portugal.SUMMARY. The Quercus suber woodlands of the ceno-anthropozoic Tagus river basin. Portugal.The analysis of the lithological formations on the Tagus river basin, with ages between Miocene andPleistocene, allows the understanding of the mosaic of two potential vegetation communities,respectively, Oleo sylvestris-Quercetum suberis and Asparago aphylli-Quercetum suberis. The grainsizeanalysis, the cohesion of particles and the effect of the anthropic actions on the lithologicalformations are the major factors that justify the mosaic of the two potential cork tree woodlands andthe respective dynamic stages. Human activities over sandy formations and conglomerates, promoteliberation and accumulation of sand particles. This process induces psammophilous species to colonize,surrogating primitive potential vegetation (Asparago aphylli-Quercetum suberis) with the cork treepsammophilous series (Oleo sylvestris-Quercetum suberis).Key words. Tagus river, lithological formations, Quercus suber woodlands, vegetation series, Portugal.

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Transport of branched tetraether lipids from the Tagus River basin to the coastal ocean of the Portuguese margin: consequences for the interpretation of the MBT'/CBT paleothermometer

Biogeosciences Discussions ◽

10.5194/bgd-11-3731-2014 ◽

2014 ◽

Vol 11 (3) ◽

pp. 3731-3776 ◽

Cited By ~ 2

Author(s):

C. Zell ◽

J.-H. Kim ◽

M. Balsinha ◽

D. Dorhout ◽

C. Fernandes ◽

...

Keyword(s):

River Basin ◽

Marine Sediments ◽

Marine Sediment ◽

Drainage Basin ◽

River System ◽

Coastal Marine ◽

Source To Sink ◽

Tagus River ◽

In Situ Production

Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs), which are transported from soil to marine sediment by rivers, have been used to reconstruct the mean annual air temperature (MAAT) and soil pH of the drainage basin using the methylation index of branched tetraethers (MBT, recently refined as MBT') and cyclization index of branched tetraethers (CBT) from coastal marine sediment records. In this study we are tracing the brGDGTs from source to sink in the Tagus River basin, the longest river system on the Iberian Peninsula, by determining their concentration and distribution in soils, river suspended particulate matter (SPM), riverbank sediments, marine SPM, and marine surface sediments. The concentrations of brGDGTs in river SPM were substantially higher and their distributions were different compared to those of the drainage basin soils. This indicates that brGDGTs are mainly produced in the river itself. In the marine environment, the brGDGT concentrations rapidly decreased with increasing distance from the Tagus estuary. At the same time, the brGDGT distributions in marine sediments also changed, indicating that marine in-situ production also takes place. These results show that there are various problems that complicate the use of the MBT'/CBT for paleoreconstructions using coastal marine sediments in the vicinity of a river. However, if the majority of brGDGTs are produced in the river, it might be possible to reconstruct the environmental (temperature and pH) conditions of the river water using appropriate aquatic calibrations, provided that marine core locations are chosen in such a way that the brGDGTs in their sediments are predominantly derived from riverine in-situ production.

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