Rudolph Anny, Medina Paulina, Urrutia Carolina, Ahumada Ramón
Facultad de Ciencias, Universidad Católica Santísima Concepción, Alonso de Ribera 2850, Casilla 297, Concepción, Chile.
Environ Monit Assess. 2009 Aug;155(1-4):419-29. doi: 10.1007/s10661-008-0444-x. Epub 2008 Jul 17.
Given its geographic characteristics, the southern Chilean fjord area is subjected to growing environmental pressure from the development of diverse forms of aquaculture (i.e., fish, algae, shellfish). The sediments accumulate substances as a natural sink, and ecotoxicology assays offer a reliable and robust proxy for sediment quality analyses. This study's objective was to establish a mid-range toxicity base line for the sediments in the region by applying a battery of non-specific ecotoxicological assays. Sediment samples (28) were collected in the channels and fjords studied during the CIMAR-Fiordos 11 cruise (July 2005). The sediments were evaluated using different species endemic to the eastern Pacific as targets: Ampelisca araucana, Tisbe longicornis, Arbacia spatuligera, and Dunaliella tertiolecta. The conditions for each assay were reported previously. Of the four species used as ecotoxicological tools, only D. tertiolecta differed significantly from the control group (negative) in terms of its growth. This difference could be attributed to nutrient enrichment. In general, we concluded that, although local changes occurred in the sediments, the mesoscale magnitude of the ecotoxicological alterations was small. Nonetheless, a surveillance program should be implemented that would allow us to follow-up and analyze the changes that are taking place in the systems on broader scales of time and space.
由于其地理特征，智利南部峡湾地区正承受着来自各种形式水产养殖（即鱼类、藻类、贝类）发展带来的日益增长的环境压力。沉积物作为自然汇积累物质，生态毒理学分析为沉积物质量分析提供了可靠且有力的指标。本研究的目的是通过应用一系列非特异性生态毒理学分析来建立该地区沉积物的中等毒性基线。在CIMAR-Fiordos 11航次（2005年7月）期间，在所研究的海峡和峡湾中采集了沉积物样本（28个）。以东太平洋特有的不同物种为目标对沉积物进行评估：阿劳卡纳长臂虾、长角哲水蚤、扁形海胆和小三毛金藻。每种分析的条件先前已报告。在用作生态毒理学工具的四个物种中，只有小三毛金藻在生长方面与对照组（阴性）有显著差异。这种差异可归因于营养物质富集。总体而言，我们得出结论，尽管沉积物中发生了局部变化，但生态毒理学改变的中尺度幅度较小。尽管如此，仍应实施一项监测计划，使我们能够在更广泛的时间和空间尺度上跟踪和分析系统中正在发生的变化。
