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101.
Dromard Charlotte R. Allenou Jean-Pierre Tapie Nathalie Budzinski Hélène Cimmaterra Nicolas De Rock Pauline Arkam Salim Cordonnier Sébastien Gonzalez Jean-Louis Bouchon-Navaro Yolande Bouchon Claude Thouard Emmanuel 《Environmental science and pollution research international》2022,29(54):81546-81556
Environmental Science and Pollution Research - The present study, conducted in the Galion Bay in Martinique, aims to highlight the temporal and seasonal variations of chlordecone contamination (an... 相似文献
102.
Synodontis (Mochokidae, Siluriformes) is a freshwater catfish endemic to Africa. The 118 extant species are present in almost all hydrographic
basins. Some species are restricted to a single stream, whereas others have a vast distribution. Synodontis is known in the fossil record since the Miocene, and its history depends on the connections among African basins through
time. The identification of species in the fossil record is essential to reconstruct this historical pattern. Catfish pectoral
and dorsal spines are robust, they preserve well and they form most of the fossil remains for the genus Synodontis. Unfortunately, the criteria for the identification of extant Synodontis species are not applicable to fossil specimens. Here, we define 11 original morphological characters that permit to discriminate
four extant species from the Chad-Chari hydrographic system. Six of these characters are defined on pectoral spines and five
on dorsal spines. We then show that these characters can be used successfully for identifying fossil specimens. In particular,
we present a case study in which we identify Synodontis cf. schall and Brachysynodontis cf. batensoda in the hominid-bearing sector Toros-Menalla (Late Miocene, northern Chad). We show that spine anatomy can be a powerful tool
to recognise catfish species through time and thus to identify historical diversity pattern. 相似文献
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106.
Emmanuel A. Frimpong John G. Lee Trent M. Sutton 《Journal of the American Water Resources Association》2006,42(5):1349-1361
ABSTRACT: This paper presents the results of cost effectiveness (CE) analysis of vegetative filter strips (VFS) and instream half‐logs as tools for recovering scores on a fish Index of Biotic Integrity (IBI) in the upper Wabash River watershed (UW) in Indiana. Three assumptions were made about recovery time for IBI scores (5,15, and 30 years) and social discount rates (1, 3, and 5 percent), which were tested for sensitivity of the estimated CE ratios. Effectiveness of VFS was estimated using fish IBIs and riparian forest cover from 49 first‐order to fifth‐order stream reaches. Half‐log structures had been installed for approximately two years in the UW prior to the study and provided a basis for estimates of cost and maintenance. Cost effectiveness ratios for VFS decreased from $387 to $277 per 100 m for a 1 percent increase in IBI scores from first‐to fifth‐order streams with 3 percent discount and 30‐year recovery. This cost weighted by proportion of stream orders was $360. The ratio decreased with decreasing time of recovery and discount rate. Based on installation costs and an assumption of equal recovery rates, half‐logs were two‐thirds to one‐half as cost‐effective as VFS. Half‐logs would be a cost‐effective supplement to VFS in low order streams if they can be proven to recover IBI scores faster than VFS do. This study provides baseline data and a framework for planning and determining the cost of stream restoration. 相似文献
107.
Julien Dron Aude Ratier Annabelle Austruy Gautier Revenko Florence Chaspoul Emmanuel Wafo 《环境科学学报(英文版)》2021,33(11):193-205
The bioaccumulation of PAHs and metal elements in the indigenous lichens Xanthoria parietina was monitored during two years at a quarterly frequency, in 3 sites of contrasted anthropic influence. The impact of the meteorological factors (temperature, relative humidity, rainfall, wind speed) was first estimated through principal component analysis, and then by stepwise multilinear regressions to include wind directions. The pollutants levels reflected the proximity of atmospheric emissions, in particular from a large industrial harbor. High humidity and mild temperatures, and in a lower extent low wind speed and rainfall, also favored higher concentration levels. The contributions of these meteorological aspects became minor when including wind direction, especially when approaching major emission sources. The bioaccumulation integration time towards meteorological variations was on a seasonal basis (1–2 months) but the wind direction and thus local emissions also relied on a longer time scale (12 months). This showed that the contribution of meteorological conditions may be prevalent in remote places, while secondary in polluted areas, and should be definitely taken into account regarding long-term lichen biomonitoring and inter-annual comparisons. In the same time, a quadruple sampling in each site revealed a high homogeneity among supporting tree species and topography. The resulting uncertainty, including sampling, preparation and analysis was below 30% when comfortable analytical conditions were achieved. Finally, the occurrence of unexpected events such as a major forest fire, permitted to evaluate that this type of short, although intense, events did not have a strong influence on PAH and metals bioaccumulation by lichen. 相似文献
108.
Técher Didier Berthier Emmanuel 《Environmental science and pollution research international》2023,30(8):19705-19724
Environmental Science and Pollution Research - Stormwater mitigation efficiency of bioretention systems relies for a large part on their capacity to infiltrate rapidly received runoff. Within this... 相似文献
109.
Julien Lusilao-Makiese Emmanuel Tessier David Amouroux Hlanganani Tutu Luke Chimuka 《毒物与环境化学》2013,95(9):1688-1706
Total mercury (HgTOT) concentrations were determined by inductively coupled plasma mass spectrometry (ICP MS) for South African Highveld coals. The distribution of Hg in coals was investigated using a four-stage sequential leaching protocol and isotope dilution/gas chromatography coupled to ICP MS (ID-GC-ICP MS). The results show that HgTOT ranged from 144 to 303?µg?kg?1 with a mean of 199?±?26?µg?kg?1, while HgTOT leached from coals using different solvents ranged between 103 and 310?µg?kg?1 (mean: 218?±?60?µg?kg?1). Hg leaching rates of 53–78% were achieved in crushed coals. Hg0, Hg2+, and CH3Hg+ were identified in all coals. CH3Hg+ in studied coals ranged between 0.1 and 0.4 (mean: 0.2) µg?kg?1. GC ICP MS chromatograms also showed unknown Hg peaks which were identified as other organomercury species such as ethylmercury. Modes of occurrence of Hg in coals were variable with the organic-bound (37–40%) and the sulfide-bound (37–39%) being the dominant mercury forms. Increasing the HCl concentration in the used protocol increased the amount of Hg leached (16%) during this step. 相似文献
110.
Matthew R. Gilg M. Camila Restrepo Ronald Walton Pamela M. Brannock Thomas J. Hilbish Emmanuel Rodriguez 《Marine Biology》2013,160(7):1737-1750
Divergence at gamete recognition loci is hypothesized to result in speciation in broadcast spawning invertebrates. Many gamete recognition loci evolve quickly and show patterns of positive selection, yet the advantage of divergence is rarely known. M7 lysin is a sperm protein in the Mytilus edulis species complex that shows evidence of adaptive evolution. This locus is polymorphic with two distinct clades within Mytilus galloprovincialis, one of which, the D clade, shows the strongest signal of positive selection. We tested whether the geographic patterns in allele frequency were consistent with the hypothesis that positive selection on D clade alleles (G D ) was due to reinforcement. Populations of M. edulis showed little evidence of introgression of G D alleles, but there was no consistent evidence of reproductive character displacement. The lack of consistent patterns expected of reinforcement suggests that another mechanism is likely responsible for the adaptive divergence of M7 lysin. 相似文献