Temporal evolution of lead isotope ratios in sediments of the Central Portuguese Margin: A fingerprint of human activities

Mil-Homens, Mário; Caetano, Miguel; Costa, Ana Novo; Lebreiro, Susana Martin; Richter, Thomas; Stigter, Henko de; Trancoso, Maria Ascensão; Brito, Pedro

doi:10.1016/j.marpolbul.2013.06.044

Cited by 20 publications

(13 citation statements)

References 49 publications

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“…However, from the plot, it is clear that the isotopic composition of the agricultural soil is the one most likely to represent the contribution from natural Pb to the total soil-Pb content. The Portuguese sediments possess less radiogenic isotopic signatures than the agricultural soil, which confirms anthropogenic Pb contributions that have been referred in the literature for the Tagus and Sado estuaries (Mil-Homens et al 2013;Richter et al 2009). Thus, it is assumed that the isotopic signature of the agricultural soil is the one actually representing natural Pb sources.…”

Section: Potential Pb Sources and Tentative Source Apportionmentsupporting

confidence: 77%

Source and pathway analysis of lead and polycyclic aromatic hydrocarbons in Lisbon urban soils

Reis

Shepherd

Nowell

et al. 2016

Science of The Total Environment

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One hundred soil samples were collected from urban spaces, in Lisbon, Portugal, in two surveys that were carried out in consecutive years, to assess the potential adverse human health effects following exposure to potentially toxic elements and organic compounds in the urban soils. The study hereby described follows on from the earlier work of the authors and aims at performing a source-pathway-fate analysis of lead (Pb) and polycyclic aromatic hydrocarbons (PAHs) in the urban soils in order to increase current knowledge on factors influencing exposure of the population. Various techniques were combined to achieve the proposed goal. Geogenic and anthropogenic sources were apportioned by means of Pb isotope mixing models. Isotope data was further coupled with geographic information system mapping to assess local mixed sources of Pb and PAHs. Unleaded vehicle exhaust and cement production show the largest relative contribution to the total soil-Pb, but their respective importance depends on factors such as location and urban landscape. The primary sources of PAHs to the urban soils are probably air and land traffic. Multivariate analysis was used to investigate which soil properties could influence mobility and fate of the contaminants. Whilst principal components analysis indicates carbonates and other calcium phases as probable factors controlling the dispersion of Pb in the urban soils, the linear models obtained from stepwise multiple regression analysis show that soil phosphorous (P) and manganese (Mn) are good predictors of the total soil Pb content. No robust model was obtained for the PAHs, impeding identifying environmental factors most likely to influence their dispersion in the urban soils. The solid-phase distribution study provided critical information to untangle the, at a first glance, contradictory results obtained by the multivariate analysis. Carbonates and other calcium phases, having these a probable anthropogenic origin, are soil components containing major fractions of Pb, P, and Mn.

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Section: Potential Pb Sources and Tentative Source Apportionmentsupporting

confidence: 77%

Source and pathway analysis of lead and polycyclic aromatic hydrocarbons in Lisbon urban soils

Reis

Shepherd

Nowell

et al. 2016

Science of The Total Environment

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“…It shows the majority of the values concentrated in the higher 208 Pb/ 206 Pb and lower 206 Pb/ 207 Pb sector. The 206 Pb/ 207 Pb suggests sediments contaminated by Pb derived from human activities which in the western Iberian canyons sets at around 1.175 (Mil-Homens et al, 2013) while the pre-industrial end-member is at 1.205 (Ferrand et al, 1999;Richter et al, 2009;Mil-Homens et al, 2013). All our samples are logically pre-industrial, mostly above 1.18 and towards the natural environment end-member, although most of them fall in a range of 1.18-1.205 (Fig.…”

Section: Geochemical Grain Size and Physical Characterization Of Sementioning

confidence: 75%

Zooming into the Mediterranean outflow fossil moat during the 1.2–1.8millionyears period (Early-Pleistocene) — An approach by radiogenic and stable isotopes

Lebreiro

Antón

Reguera

et al. 2015

Global and Planetary Change

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“…These findings agree with previous studies on the early life stages of P . acuta from Hong Kong, which have suggested their high tolerance to environmental extremes [18, 42–44]. Possible reasons for the relatively high thermal tolerance of corals may be related to a large annual range of mean seawater temperature in Hong Kong, from 16°C in winter to 30°C in summer [18, 20].…”

Section: Discussionmentioning

confidence: 99%

“…acuta from Hong Kong are tolerant to environmental stresses. Examples of these include the high tolerance of fertilization, larval survival, motility, settlement and growth to heavy metal and elevated temperature [42, 43], of fertilization, embryonic development, larval survival, motility and settlement to inorganic nutrients [44], and high tolerance of fertilization success and embryonic development to reduced salinity and elevated temperature [18, 20]. However, the effects of salinity and temperature stresses on later stages (i.e., settlement, post-settlement survival and early growth) of the corals have not been thoroughly examined.…”

Section: Introductionmentioning

confidence: 99%

High tolerance to temperature and salinity change should enable scleractinian coral Platygyra acuta from marginal environments to persist under future climate change

Chui

Ang

2017

PLoS ONE

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With projected changes in the marine environment under global climate change, the effects of single stressors on corals have been relatively well studied. However, more focus should be placed on the interactive effects of multiple stressors if their impacts upon corals are to be assessed more realistically. Elevation of sea surface temperature is projected under global climate change, and future increases in precipitation extremes related to the monsoon are also expected. Thus, the lowering of salinity could become a more common phenomenon and its impact on corals could be significant as extreme precipitation usually occurs during the coral spawning season. Here, we investigated the interactive effects of temperature [24, 27 (ambient), 30, 32°C] and salinity [33 psu (ambient), 30, 26, 22, 18, 14 psu] on larval settlement, post-settlement survival and early growth of the dominant coral Platygyra acuta from Hong Kong, a marginal environment for coral growth. The results indicate that elevated temperatures (+3°C and +5°C above ambient) did not have any significant effects on larval settlement success and post-settlement survival for up to 56 days of prolonged exposure. Such thermal tolerance was markedly higher than that reported in the literature for other coral species. Moreover, there was a positive effect of these elevated temperatures in reducing the negative effects of lowered salinity (26 psu) on settlement success. The enhanced settlement success brought about by elevated temperatures, together with the high post-settlement survival recorded up to 44 and 8 days of exposure under +3°C and +5°C ambient respectively, resulted in the overall positive effects of elevated temperatures on recruitment success. These results suggest that projected elevation in temperature over the next century should not pose any major problem for the recruitment success of P. acuta. The combined effects of higher temperatures and lowered salinity (26 psu) could even be beneficial. Therefore, corals that are currently present in marginal environments like Hong Kong, as exemplified by the dominant P. acuta, are likely to persist in a warmer and intermittently less saline, future ocean.

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Temporal evolution of lead isotope ratios in sediments of the Central Portuguese Margin: A fingerprint of human activities

Cited by 20 publications

References 49 publications

Source and pathway analysis of lead and polycyclic aromatic hydrocarbons in Lisbon urban soils

Source and pathway analysis of lead and polycyclic aromatic hydrocarbons in Lisbon urban soils

Zooming into the Mediterranean outflow fossil moat during the 1.2–1.8millionyears period (Early-Pleistocene) — An approach by radiogenic and stable isotopes

High tolerance to temperature and salinity change should enable scleractinian coral Platygyra acuta from marginal environments to persist under future climate change

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