Invading grass-like alga transforms rippled sand bars into bumpy muddy flats: arrival of a game changer in the Wadden Sea?

IF 2.2 3区 环境科学与生态学 Q2 ECOLOGY
K. Reise, Rune Michaelis, N. Rybalka
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引用次数: 5

Abstract

In the wake of biological globalization, translocated species of high bio-engineering capacity increasingly change bottom topography of sedimentary coasts. A Vaucheria taxon (Xanthophyceae) of unknown origin is spreading at the transition between intertidal and subtidal zones, while resident Vaucheria -species are confined to the upper shore in the Wadden Sea (European Atlantic). Near the island of Sylt, dense turfs of green filaments rapidly expanded over an area of 180 ha within 3 years. The unicellular filaments reach about 5 cm out of and 5 cm into the sediment. Felted rhizoids provide firm anchorage. Dry phytomass (up to 208 g m -2 ) was similar to that of intertidal seagrass beds. Residual filaments overwinter in the sediment and give rise to renewed growth in late spring. In addition, oospores germinate. Fine particles are trapped by the turf during summer, generating laminated cohesive mud. Muddy hummocks arise up to 20 cm above ambient sand flats, alternating with troughs but gradually merge into coherent and pertinacious plateaus of mud. This shift in bottom topography and sediment composition may potentially change the mud balance of tidal basins, and the capacity of tidal flats in catching up with accelerating sea-level rise.
入侵的草状藻类将起伏的沙洲变成了颠簸的泥泞平原:瓦登海的游戏规则改变者的到来?
随着生物全球化的发展,高生物工程能力的易位物种日益改变着沉积海岸的底部地形。在潮间带和潮下带之间的过渡地带,一个来源不明的沃切利亚分类群(叶黄科)正在扩散,而沃切利亚的常住物种则局限于瓦登海(欧洲大西洋)的上游。在锡尔特岛附近,密集的绿色草皮在3年内迅速扩大到180公顷的面积。单细胞细丝向沉积物外约5厘米,向沉积物内约5厘米。毡状根状体提供牢固的锚定。干生物量(高达208 g m -2)与潮间带海草床相似。残留的细丝在沉积物中越冬,并在晚春重新生长。此外,卵孢子也会发芽。夏季,细小颗粒被草皮捕获,形成层状粘性泥浆。泥泞的小丘高出周围的沙地20厘米,与沟槽交替,但逐渐合并成连贯而顽固的泥高原。海底地形和沉积物组成的这种变化可能会潜在地改变潮汐盆地的泥浆平衡,以及潮滩赶上海平面加速上升的能力。
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来源期刊
Aquatic Invasions
Aquatic Invasions ECOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
4.30
自引率
0.00%
发文量
20
审稿时长
6-12 weeks
期刊介绍: Aquatic Invasions is an open access, peer-reviewed international journal focusing on academic research of biological invasions in both inland and coastal water ecosystems from around the world. It was established in 2006 as initiative of the International Society of Limnology (SIL) Working Group on Aquatic Invasive Species (WGAIS) with start-up funding from the European Commission Sixth Framework Programme for Research and Technological Development Integrated Project ALARM. Aquatic Invasions is an official journal of International Association for Open Knowledge on Invasive Alien Species (INVASIVESNET). Aquatic Invasions provides a forum for professionals involved in research of aquatic non-native species, including a focus on the following: • Patterns of non-native species dispersal, including range extensions with global change • Trends in new introductions and establishment of non-native species • Population dynamics of non-native species • Ecological and evolutionary impacts of non-native species • Behaviour of invasive and associated native species in invaded areas • Prediction of new invasions • Advances in non-native species identification and taxonomy
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