LOG, Laboratoire d'Océanologie et de Géosciences, University Lille, CNRS, University Littoral Côte d'Opale, UMR 8187, Station Marine de Wimereux, Lille 59000, France.
University of Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, Villeurbanne 69622, France.
Proc Biol Sci. 2023 Mar 8;290(1994):20230193. doi: 10.1098/rspb.2023.0193.
This study aimed to describe for the first time the vertical motion behaviour of the intertidal foraminifera and its contribution to bioturbation. Its infaunal behaviour leads to the creation of a one-end tube within the first centimetre of sediment. In addition, a vertical trail following behaviour was described for the first time in foraminifera, which may be linked to the sustainability of the biogenic sedimentary structures. As a consequence, produces a vertical transport of both mud and fine sediment fractions similarly to the sediment reworking mode reported for gallery-diffusor benthic species. This finding allows us to refine the bioturbating mode of , previously classified as surficial biodiffusor. Furthermore, sediment reworking intensity appeared to be dependent on the foraminiferal density. would adapt its motion behaviour to deal with the intra-specific competition for food and space that may occur when density increases. Consequently, this behavioural modification would affect both the species and the individual contribution to sediment reworking processes. , sediment reworking in may further contribute to the bioirrigation of intertidal sediments, which has implications for oxygen availability in sediments and on aerobic microbial processes involved in carbon and nutrient cycling at the sediment-water interface.
本研究首次描述了潮间带有孔虫的垂直运动行为及其对生物扰动的贡献。它的穴居行为导致在沉积物的前 1 厘米内形成一个一端的管。此外，首次描述了有孔虫的垂直跟踪行为，这可能与生物成因沉积结构的可持续性有关。因此，产生了类似报道的用于画廊-扩散体底栖物种的再悬浮模式的泥和细沉积物的垂直输运。这一发现使我们能够改进先前被归类为表面生物扩散体的的生物扰动模式。此外，沉积物再悬浮强度似乎取决于有孔虫的密度。当密度增加时，可能会发生种内竞争食物和空间的情况，因此，这种运动行为的改变将影响到物种和个体对沉积物再悬浮过程的贡献。因此，在潮间带沉积物中，再悬浮可能进一步促进生物灌溉，这对沉积物中的氧气供应以及与碳和营养物质在沉积物-水界面的循环有关的好氧微生物过程有影响。
