Cattle exposure to chlordecone through soil intake. The case-study of tropical grazing practices in the French West Indies

Collas, Claire; Mahieu, Maurice; Tricheur, Alexandre; Crini, Nadia; Archimède, Harry; Rychen, Guido; Feidt, Cyril; Jurjanz, Stéfan

doi:10.1016/j.scitotenv.2019.02.384

Cited by 24 publications

(24 citation statements)

References 34 publications

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“…2). This postgrazing sward height near to 14 cm seemed to be relatively high compared to the range of 3.3-8.2 cm reported in previous works 5,6 but the important differences in postgrazing vegetation structure (long lying stems vs. short erected ones) limiting the comparison of postgrazing sward heights with these studies. Indeed, animals grazed on the experimental plot until resource depletion and at D12 the remaining vegetation cover was only constituted of lying fibrous stems forming an 'insulating carpet' above the ground (Fig.…”

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confidence: 57%

“…The titanium content of washed grass was due to soil particles which resisted despite grass washing. The sward soiling increases when animals grazed on water-saturated surface compared to dry soil surface, as shown by Collas et al 6 and measured also by the titanium content of unwashed grass. In the present study, daily rainfall was recorded and was not significantly linked to titanium content in unwashed grass (P > 0.05).…”

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confidence: 67%

“…The recorded daily rainfall showed higher values for the four last days (D9-D12) on the experimental plot whereas sward soiling did not change during the whole experiment. This study did not allow to evidence a link between daily rainfall and sward soiling but soil surface moisture was neither controlled nor measured, contrary to the study of Collas et al 6 for which the two levels of soil surface moisture were well contrasted because of an experimental irrigation of 20 mm per night.…”

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confidence: 70%

“…3b and 3c). Previous studies conducted in tether-grazing growing bulls already reported a large range of variability in soil ingestions 5,6 ( Table 1). Given that in these experiments the animals presented similar age and BW, this interindividual variability can be attributed to differences in feeding behaviour between individuals.…”

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confidence: 92%

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Dynamics of soil ingestion by growing bulls during grazing on a high sward height in the French West Indies

Collas

Mahieu

Crini

et al. 2020

Sci Rep

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Free-range livestock are exposed to environmental contaminants by ingesting contaminated matrices mainly soil. Several works evaluated precisely the soil ingestion and its variation factors in ruminants. Contrary to temperate grazing systems, tropical ones were poorly documented whereas weather or traditional grazing practices may change models established in temperate systems. The study was performed in the French West Indies, which are concerned by a widespread environmental chlordecone contamination. The work evaluated daily soil and grass ingestions by tethered growing bulls grazing on a very high sward close to 50 cm for 11 days without being moved. This grazing management is representative to local practices by small farmers or not professional holders and allows completing the results previously obtained. Daily soil ingestion did not significantly increase across time and was on average 26.9 g dry matter/100 kg body weight (i.e. 1.4% of the total mass ingested). Marked individual variations indicated that exposure risk assessments would require experimental designs based on a sufficient number of individuals. This study was also the first to investigate the changes in sward soiling with respect to the distance from the stake and reported lower soil loading on grass in the peripheral than central and intermediate areas.

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confidence: 67%

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confidence: 70%

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confidence: 92%

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Dynamics of soil ingestion by growing bulls during grazing on a high sward height in the French West Indies

Collas

Mahieu

Crini

et al. 2020

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“…Surface water, ground water, sediments and receiving coastal wasters have all been impacted. CLD has also been found to accumulate in animals [15][16][17] and plants used for food, including tubers and other vegetables grown in soil [18,19] as well as in marine fauna [9,20]. Effective methods to decontaminate soil and protect downgradient environments, food and water supply are clearly needed.…”

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confidence: 99%

Evidence for extensive anaerobic dechlorination and transformation of the pesticide chlordecone (C10Cl10O) by indigenous microbes in microcosms from Guadeloupe soil

et al. 2020

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The historic use of chlordecone (C 10 Cl 10 O) as a pesticide to control banana weevil infestations has resulted in pollution of large land areas in the French West Indies. Although currently banned, chlordecone persists because it adsorbs strongly to soil and its complex bishomocubane structure is stable, particularly under aerobic conditions. Abiotic chemical transformation catalyzed by reduced vitamin B 12 has been shown to break down chlordecone by opening the cage structure to produce C9 polychloroindenes. More recently these C9 polychloroindenes were also observed as products of anaerobic microbiological transformation. To investigate the anaerobic biotransformation of chlordecone by microbes native to the French West Indies, microcosms were constructed anaerobically from chlordecone impacted Guadeloupe soil and sludge to mimic natural attenuation and eletron donor-stimulated reductive dechlorination. Original microcosms and transfers were incubated over a period of 8 years, during which they were repeatedly amended with chlordecone and electron donor (ethanol and acetone). Using LC-MS, chlordecone and degradation products were detected in all the biologically active microcosms. Observed products included monohydro-, dihydro-and trihydrochlordecone derivatives (C 10 Cl 10-n O 2 H n ; n = 1,2,3), as well as "open cage" C9 polychloroindene compounds (C 9 Cl 5-n H 3+n n = 0,1,2) and C10 carboxylated polychloroindene derivatives (C 10 Cl 4-n O 2 H 4+n , n = 0-3). Products with as many as 9 chlorine atoms removed were detected. These products were not observed in sterile (poisoned) microcosms. Chlordecone concentrations decreased in active microcosms as concentrations of products increased, indicating that anaerobic dechlorination processes have occurred. The data enabled a crude estimation of partitioning coefficients between soil and water, showing that carboxylated intermediates sorb poorly and as a consequence may be flushed away, while polychlorinated indenes sorb strongly to soil. Microbial community analysis in microcosms revealed enrichment of anaerobic fermenting and acetogenic microbes possibly involved in anaerobic chlordecone biotransformation. It thus should be possible to

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A Bayesian network approach for the identification of relationships between drivers of chlordecone bioaccumulation in plants

Liber

Cornet

Tournebize

et al. 2020

Environ Sci Pollut Res

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Plants were sampled from four different types of chlordecone-contaminated land in Guadeloupe (West Indies). The objective was to investigate the importance of biological and agri-environmental parameters in the ability of plants to bioaccumulate chlordecone. Among the plant traits studied, only the growth habit significantly affected chlordecone transfer, since prostrate plants concentrated more chlordecone than erect plants. In addition, intensification of land use has led to a significant increase in the amount of chlordecone absorbed by plants. The use of Bayesian networks uncovers some hypothesis and identifies paths for reflection and possible studies to identify and quantify relationships that explain our data.

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Cattle exposure to chlordecone through soil intake. The case-study of tropical grazing practices in the French West Indies

Cited by 24 publications

References 34 publications

Dynamics of soil ingestion by growing bulls during grazing on a high sward height in the French West Indies

Dynamics of soil ingestion by growing bulls during grazing on a high sward height in the French West Indies

Evidence for extensive anaerobic dechlorination and transformation of the pesticide chlordecone (C10Cl10O) by indigenous microbes in microcosms from Guadeloupe soil

A Bayesian network approach for the identification of relationships between drivers of chlordecone bioaccumulation in plants

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