Figueiredo Marcia A O, Eide Ingvar, Reynier Marcia, Villas-Bôas Alexandre B, Tâmega Frederico T S, Ferreira Carlos Gustavo, Nilssen Ingunn, Coutinho Ricardo, Johnsen Ståle
Instituto de Pesquisa Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, Jardim Botânico 22460-030, Rio de Janeiro, RJ, Brazil; Instituto Biodiversidade Marinha, Avenida Ayrton Senna 250, Sala 208, Barra da Tijuca, 22793-000, Rio de Janeiro, RJ, Brazil; Instituto de Estudos do Mar Almirante Paulo Moreira, Departamento de Oceanografia, Divisão de Biotecnologia Marinha, Rua Kioto 253, 28930-000, Arraial do Cabo, RJ, Brazil.
Statoil ASA, Research, Development and Innovation, N-7005 Trondheim, Norway.
Mar Pollut Bull. 2015 Jun 15;95(1):81-8. doi: 10.1016/j.marpolbul.2015.04.040. Epub 2015 Apr 29.
The impact of sediment coverage on two rhodolith-forming calcareous algae species collected at 100m water depth off the coast of Brazil was studied in an experimental flow-through system. Natural sediment mimicking drill cuttings with respect to size distribution was used. Sediment coverage and photosynthetic efficiency (maximum quantum yield of charge separation in photosystem II, ϕPSIImax) were measured as functions of light intensity, flow rate and added amount of sediment once a week for nine weeks. Statistical experimental design and multivariate data analysis provided statistically significant regression models which subsequently were used to establish exposure-response relationship for photosynthetic efficiency as function of sediment coverage. For example, at 70% sediment coverage the photosynthetic efficiency was reduced 50% after 1-2weeks of exposure, most likely due to reduced gas exchange. The exposure-response relationship can be used to establish threshold levels and impact categories for environmental monitoring.
在一个实验性流通系统中，研究了沉积物覆盖对在巴西海岸外100米水深处采集的两种形成钙质藻结皮的钙质藻类物种的影响。使用了在粒度分布方面模拟钻屑的天然沉积物。在九周的时间里，每周测量一次沉积物覆盖度和光合效率（光系统II中电荷分离的最大量子产率，ϕPSIImax），作为光强、流速和沉积物添加量的函数。统计实验设计和多变量数据分析提供了具有统计学意义的回归模型，随后用于建立光合效率与沉积物覆盖度之间的暴露-响应关系。例如，在沉积物覆盖度为70%时，暴露1-2周后光合效率降低了50%，这很可能是由于气体交换减少所致。该暴露-响应关系可用于确定环境监测的阈值水平和影响类别。
