Department of Biology, University of Pisa, Via Ghini 13, 56126 Pisa, Italy.
Lagoon Ecology and Aquaculture Laboratory (LEALab), OPL s.r.l., via G. Leopardi 9, 58015 Orbetello, Italy.
Mar Pollut Bull. 2018 Apr;129(2):772-781. doi: 10.1016/j.marpolbul.2017.10.071. Epub 2017 Oct 28.
Seasonal changes of high density Chaetomorpha linum mats were studied in an eutrophic coastal lagoon. We measured biomass and specific growth rate and analyzed water quality, sediment labile organic matter (LOM), photosynthetic efficiency and pigments in two areas: one subjected to sediment resuspension and algal mass shuffling through specific boats and the other left undisturbed. Low disturbance enhanced algal survival under critical summer conditions, by reducing LOM and promoting growth through thalli fragmentation. Chaetomorpha linum grew fast and quickly acclimated its physiology to adverse conditions, although the mat underlayer showed low photosynthetic efficiency. Nevertheless, the ability to respond to the adverse environment was not sufficient to prevent the sudden algal decay, which occurred following a prolonged summer stress. Present results may help to plan the lagoon management through boat operations, to attain a more effective control over the algal growth and a more efficient removal of the mat.
对富营养化沿海泻湖中的高密度石莼垫进行了季节性变化研究。我们测量了生物量和比生长率，并分析了水质、沉积物可利用有机物质（LOM）、光合作用效率和色素，在两个区域进行了分析：一个区域受到特定船只引起的沉积物再悬浮和藻类大量混合的影响，另一个区域未受干扰。低干扰通过减少 LOM 和促进藻体碎裂来促进生长，从而在夏季临界条件下提高了藻类的存活率。石莼生长迅速，很快使其生理适应了不利条件，尽管垫下层的光合作用效率较低。然而，对不利环境的响应能力不足以防止藻类在长期夏季胁迫后突然衰减。目前的结果可能有助于通过船只作业来规划泻湖管理，以更有效地控制藻类生长并更有效地清除垫。
