Baldassarre Laura, Natali Vanessa, De Pascale Fabio, Vezzi Alessandro, Banchi Elisa, Bazzaro Matteo, Relitti Federica, Tagliapietra Davide, Cibic Tamara
Oceanography Section, National Institute of Oceanography and Applied Geophysics-OGS, 34010 Trieste, Italy.
Department of Biology, University of Padua, 35122 Padua, Italy.
Microorganisms. 2023 Apr 3;11(4):936. doi: 10.3390/microorganisms11040936.
MOSE is a system of mobile gates engineered to temporarily isolate the Venice Lagoon from the Adriatic Sea and to protect the city from flooding during extreme high tides. Within the framework of the Venezia2021 program, we conducted two experiments in July 2019 (over 48 h) and October 2020 (over 28 h) by means of 18 mesocosms, in order to simulate the structural alterations that microphytobenthos (MPB) assemblages might encounter when the MOSE system is operational. The reduced hydrodynamics inside the mesocosms favored the deposition of organic matter and the sinking of cells from the water column towards the sediment. Consequently, MPB abundances increased over the course of both experiments and significant changes in the taxonomic composition of the community were recorded. Species richness increased in summer while it slightly decreased in autumn, this latter due to the increase in relative abundances of taxa favored by high organic loads and fine grain size. By coupling classical taxonomy with 18S rRNA gene metabarcoding we were able to obtain a comprehensive view of the whole community potential, highlighting the complementarity of these two approaches in ecological studies. Changes in the structure of MPB could affect sediment biostabilization, water turbidity and lagoon primary production.
摩西系统是一种活动闸门系统，其设计目的是将威尼斯潟湖与亚得里亚海临时隔离开来，并在极端高潮期间保护城市免受洪水侵袭。在威尼斯2021项目框架内，我们于2019年7月（超过48小时）和2020年10月（超过28小时）借助18个中型生态系统进行了两项实验，以模拟摩西系统运行时微型底栖植物（MPB）群落可能遇到的结构变化。中型生态系统内水动力的减弱有利于有机物质的沉积以及细胞从水柱向沉积物的沉降。因此，在两项实验过程中，MPB的丰度均有所增加，并且记录到群落分类组成发生了显著变化。夏季物种丰富度增加，而秋季略有下降，后者是由于高有机负荷和细粒度所青睐的分类单元相对丰度增加所致。通过将经典分类学与18S rRNA基因宏条形码相结合，我们能够全面了解整个群落的潜力，突出了这两种方法在生态学研究中的互补性。MPB结构的变化可能会影响沉积物生物稳定、水体浊度和潟湖初级生产力。
