Effects of suspended sediments on the sponge holobiont with implications for dredging management
Effects of suspended sediments on the sponge holobiont with implications for dredging management
复制标题
悬浮沉积物对海绵全生物的影响及其对疏浚管理的影响
作者：
M. Pineda;Brian W. Strehlow;Miriam Sternel;A. Duckworth;Ross Jones;N. Webster
疏浚可能会导致水体中悬浮沉积物浓度较高（SSC），对海绵等过滤进食生物构成危险，因为沉积物可能会堵塞其含水系统并减少进食。为了提供海绵对 SSC 的压力响应值并梳理疏浚压力的原因：影响路径，通过实验将五种异养和光养物种暴露于一系列高达 100mgL−1 的疏浚相关 SSC，并在处理过程中进行光补偿，以确保 SSC 是主要物理参数。这项研究表明，一些海绵物种长时间（28天）暴露于高SSC（≥23mgL−1）下，其存活率较低，坏死增加，能量储备耗尽。相比之下，≤10mgL−1 的 SSC 几乎不会造成负面影响（如果有的话），因此建议将其作为海绵的谨慎亚致死阈值。尽管在某些暴露于高 SSC 的海绵物种中检测到营养从混合营养向增加光养转变，但 SSC 处理期间微生物群落没有显着变化。然而重要的是，预计SSC与低光可用性和疏浚作业期间发生的沉积物窒息的综合影响将增加对海绵的负面影响。
Dredging can cause high suspended sediment concentrations (SSC) in the water column, posing a hazard to filter feeding organisms like sponges as sediment may clog their aquiferous systems and reduce feeding. In order to provide pressure−response values for sponges to SSC and tease apart the cause:effect pathways of dredging pressures, five heterotrophic and phototrophic species were experimentally exposed to a range of dredging-relevant SSC of up to 100 mg L−1, with light compensation across treatments to ensure that SSC was the primary physical parameter. This study shows that some sponge species exposed to high SSC (≥23 mg L−1) for extended periods (28 d) have lower survival, increased necrosis and depletion of energy reserves. In contrast, SSC of ≤10 mg L−1 caused few, if any, negative effects and is thus suggested as a prudent sub-lethal threshold for sponges. Microbial communities did not change significantly among SSC treatments, although a nutritional shift from mixotrophy towards increased phototrophy was detected for some sponge species exposed to high SSC. Importantly however, it is expected that the combined effect of SSC with low light availability and sediment smothering as occurs during dredging operations will increase the negative effects on sponges.
影响因子：
5.2
作者：
Anthony, Kenneth R. N.;Hoogenboom, Mia O.;Middlebrook, Rachael
通讯作者：
Middlebrook, Rachael