Laboratoire de Biologie Marine, DYNECAR EA926, Université des Antilles et de la Guyane, Campus de Fouillole BP 592, 97159 Pointe-à-Pitre Cedex, Guadeloupe.
LIENSS, UMR 6250, Université de La Rochelle, Institut du Littoral et de l'Environnement (ILE), 2 rue Olympe de Gouges, 17000 La Rochelle, France.
Ecotoxicol Environ Saf. 2012 May;79:80-89. doi: 10.1016/j.ecoenv.2011.12.005. Epub 2011 Dec 30.
Surface sediment and oysters (Crassostrea rhizophorae) from the coastlines of Guadeloupe were analysed for polycyclic aromatic hydrocarbons (PAHs) using GC/MS. Biomarkers of oxidative stress were used to assess the response of these oysters to hydrocarbons exposure. The total concentration of PAHs in the sediment ranged from 49 to 1065 ng/g dw, while concentrations in oyster ranged from 66 to 961 ng/g dw. Molecular indices based on isomeric PAHs ratios characterize the pollution sources and show that most of the contaminations in sediment originate from pyrolytic inputs. Bioaccumulation factors (BAFs) have been related to isomeric ratio calculated for oysters in order to refine PAHs sources. The variations of BAFs observed in the different compounds resulted from different uptake pathways in the mangrove oysters according to the type of inputs. Response of biomarkers showed inhibition of catalase and an increase of lipid peroxidation at the station where PAHs concentrations were the highest. Taken together, data obtained point to the relevance of considering environmental conditions as factors influencing biomarker responses in environmental monitoring programs. These data also indicate the need for regular environmental follow-up studies in Guadeloupe.
使用 GC/MS 对来自瓜德罗普岛海岸线的表层沉积物和牡蛎（Crassostrea rhizophorae）中的多环芳烃（PAHs）进行了分析。使用氧化应激生物标志物来评估这些牡蛎对烃类暴露的反应。沉积物中多环芳烃的总浓度范围为 49 至 1065ng/gdw，而牡蛎中的浓度范围为 66 至 961ng/gdw。基于等排 PAHs 比值的分子指数可用于描述污染来源，并表明沉积物中的大部分污染源自热解输入。为了更准确地确定 PAHs 来源，将与牡蛎中计算出的等排比值相关的生物积累因子（BAFs）与等排比值进行了比较。不同化合物中观察到的 BAFs 变化是由于根据输入类型，红树林牡蛎中不同的吸收途径造成的。生物标志物的反应表明，在多环芳烃浓度最高的站点，过氧化氢酶受到抑制，脂质过氧化作用增加。综合来看，这些数据表明，在环境监测计划中，需要考虑环境条件作为影响生物标志物反应的因素。这些数据还表明，需要在瓜德罗普岛定期进行环境跟踪研究。
