Environmental transformation of the Bilbao estuary, N. Spain: microfaunal and geochemical proxies in the recent sedimentary record

Cearreta, Alejandro; Irabién, María Jesús; Leorri, Eduardo; Yusta, Iñaki; Quintanilla, Ana Luz; Zabaleta, Ane

doi:10.1016/s0025-326x(01)00261-2

Cited by 83 publications

(38 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A comparison of our data with anthropogenically affected sediments in the Bilbao estuary, Spain (CEARRETA et al, 2002), the SW Iberian shelf (CORREDEIRA et al, 2008), and Santos bay and estuary, SE Brazil (TESSLER et al, 2006) revealed that the sediments from the core analyzed here are significantly poorer in heavy metals than those from the Iberian sediments. On the other hand, after the opening of the Valo Grande, levels of Pb, Cu, Zn and Cr were of the same order of magnitude as those from the highly polluted Santos estuary (Table 1).…”

Section: Discussionmentioning

confidence: 57%

“…The Enrichment Factor (EF) is considered to be a reliable estimate for the input of metals in a given environment and can be especially useful for analyzing anthropogenic influences (CEARRETA et al, 2002). In this sense, the variations in the EFs of the core analyzed here could be efficiently used for the analysis of the historical changes that occurred in the Cananéia-Iguape system.…”

Section: Discussionmentioning

confidence: 99%

“…Due to their geomorphological and physicochemical properties, lagoons and estuaries are potential deposit areas for anthropogenic sediments, and the number of studies dealing with these subjects is increasing rapidly (JONES; TURKI, 1997;BIRCH;TAYLOR, 1999;CEARRETA et al, 2000CEARRETA et al, , 2002CUNDY et al, 2003;ELBERLING et al, 2003;PASTERNACK;BROWN, 2006;DONDERS et al, 2008;LEORRI et al, 2008). An important approach to the subject is related to the sedimentary record of this anthropogenic influence, which incorporates high resolution geochronology with proxies of different types so as to provide a reliable documentation of the contamination history of a given area (ALVE, 1991(ALVE, , 1995PLATER et al, 1998;APPEBY, 2004;LI et al, 2000;CHAN et al, 2001;CEARRETA et al, 2002;RUIZ-FERNÁNDEZ et al, 2007, among others).…”

Section: Introductionmentioning

confidence: 99%

“…An important approach to the subject is related to the sedimentary record of this anthropogenic influence, which incorporates high resolution geochronology with proxies of different types so as to provide a reliable documentation of the contamination history of a given area (ALVE, 1991(ALVE, , 1995PLATER et al, 1998;APPEBY, 2004;LI et al, 2000;CHAN et al, 2001;CEARRETA et al, 2002;RUIZ-FERNÁNDEZ et al, 2007, among others). Fox et al (1999) studied metal levels (As, Cr, Cu, Pb, Hg and Zn), radionuclides ( 137 Cs,238 Pu, 239+240 Pu and 241 Am) and DDT in the Mersey Estuary (UK).…”

Section: Introductionmentioning

confidence: 99%

“…Other outstanding papers on the subject included those carried out by Cearreta et al (2000Cearreta et al ( , 2002 who identified the impact of the anthropogenic activities in the metal geochemistry and microfauna of the Bilbao Estuary (Northern Spain). Over a 150-year period, this estuary received effluents from mining and industrial and domestic waste, and it became the most polluted estuary in North of Spain.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Anthropogenic influences in a lagoonal environment: a multiproxy approach at the valo grande mouth, Cananéia-Iguape system (SE Brazil)

et al. 2009

View full text Add to dashboard Cite

A B S T R A C TThe Cananéia-Iguape system, SE Brazil, consists of a complex of lagoonal channels, located in a United Nations Educational, Scientific and Cultural Organization (UNESCO) Biosphere Reserve. Nevertheless, important environmental changes have occurred in approximately the last 150 yrs due to the opening of an artificial channel, the Valo Grande, connecting the Ribeira de Iguape River to the lagoonal system. Our objective is to assess the historical record of the uppermost layers of the sedimentary column of the lagoonal system in order to determine the history of environmental changes caused by the opening of the artificial channel. In this sense, an integrated geochemicalfaunal approach is used. The environmental changes led significant modifications in salinity, in changes of the depositional patterns of sediments and foraminiferal assemblages (including periods of defaunation), and, more drastically, in the input of heavy metals to the coastal environment. The concentrations Pb in the core analyzed here were up to two times higher than the values measured in contaminated sediments from the Santos estuary, the most industrialized coastal zone in Brazil. R E S U M OO sistema Cananéia-Iguape (Sudeste do Brasil), consiste em um complexo de canais lagunares localizados no interior de uma Reserva da Biosfera (assim definida pela UNESCO). Não obstante, variações ambientais importantes ocorreram nos últimos 150 anos, devido à abertura de um canal artificial, o Valo Grande, conectando o Rio Ribeira de Iguape ao sistema lagunar. O objetivo deste trabalho foi determinar a história das variações ambientais no sistema lagunar, causadas pela abertura do canal artificial, através da análise das camadas superiores da coluna sedimentar de um testemunho coletado no sistema. Neste sentido, uma abordagem integrada, envolvendo variações geoquímicas e faunísticas foi utilizada. As variações ambientais ocorridas apontam para mudanças drásticas na salinidade, nos padrões de sedimentação, nas associações de foraminíferos (incluindo períodos azóicos) e, mais drasticamente, no aporte de metais para o sistema costeiro. As concentrações de Pb no testemunho coletado indicam valores duas vezes maiores do que os medidos em sedimentos contaminados do estuário de Santos, situado na zona costeira mais industrializada do Brasil.

show abstract

Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Anthropogenic influences in a lagoonal environment: a multiproxy approach at the valo grande mouth, Cananéia-Iguape system (SE Brazil)

et al. 2009

View full text Add to dashboard Cite

show abstract

Human‐induced marine ecological degradation: micropaleontological perspectives

Yasuhara

Hunt

Breitburg

et al. 2012

Ecology and Evolution

106

View full text Add to dashboard Cite

We analyzed published downcore microfossil records from 150 studies and reinterpreted them from an ecological degradation perspective to address the following critical but still imperfectly answered questions: (1) How is the timing of human-induced degradation of marine ecosystems different among regions? (2) What are the dominant causes of human-induced marine ecological degradation? (3) How can we better document natural variability and thereby avoid the problem of shifting baselines of comparison as degradation progresses over time? The results indicated that: (1) ecological degradation in marine systems began significantly earlier in Europe and North America (∼1800s) compared with Asia (post-1900) due to earlier industrialization in European and North American countries, (2) ecological degradation accelerated globally in the late 20th century due to post-World War II economic growth, (3) recovery from the degraded state in late 20th century following various restoration efforts and environmental regulations occurred only in limited localities. Although complex in detail, typical signs of ecological degradation were diversity decline, dramatic changes in total abundance, decrease in benthic and/or sensitive species, and increase in planktic, resistant, toxic, and/or introduced species. The predominant cause of degradation detected in these microfossil records was nutrient enrichment and the resulting symptoms of eutrophication, including hypoxia. Other causes also played considerable roles in some areas, including severe metal pollution around mining sites, water acidification by acidic wastewater, and salinity changes from construction of causeways, dikes, and channels, deforestation, and land clearance. Microfossils enable reconstruction of the ecological history of the past 102–103 years or even more, and, in conjunction with statistical modeling approaches using independent proxy records of climate and human-induced environmental changes, future research will enable workers to better address Shifting Baseline Syndrome and separate anthropogenic impacts from background natural variability.

show abstract

The Anthropocene, Wait, What? A Basque’s Coastal Experience Helps to Figure It Out

Leorri

2020

Springer Climate

View full text Add to dashboard Cite

Environmental transformation of the Bilbao estuary, N. Spain: microfaunal and geochemical proxies in the recent sedimentary record

Cited by 83 publications

References 18 publications

Anthropogenic influences in a lagoonal environment: a multiproxy approach at the valo grande mouth, Cananéia-Iguape system (SE Brazil)

Anthropogenic influences in a lagoonal environment: a multiproxy approach at the valo grande mouth, Cananéia-Iguape system (SE Brazil)

Human‐induced marine ecological degradation: micropaleontological perspectives

The Anthropocene, Wait, What? A Basque’s Coastal Experience Helps to Figure It Out

Contact Info

Product

Resources

About