Fragmentation and separation of diatom valves in modern shallow lake sediments: a case study in Lake Kitaura, Japan

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES Journal of Paleolimnology Pub Date : 2024-07-01 DOI:10.1007/s10933-024-00332-0
Kento Kumisaka, Naofumi Yamaguchi, Yusuke Okazaki
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Abstract

We investigated diatom-valve fragmentation and frustule separation in surface sediments in Lake Kitaura, a shallow lake in Japan, to clarify how sedimentation processes affect diatom assemblages. Twenty-two surface-sediment samples were collected from Lake Kitaura in 2014. Aulacoseira spp. were characteristic planktonic taxa, and Cocconeis placentula and Planothidium lanceolatum were characteristic benthic taxa, both with monoraphid valves. The fragmentation ratios of Aulacoseira spp., the most abundant taxon, were higher nearshore than in the central part of the lake. Cocconeis placentula, an epiphytic species, was widely distributed in Lake Kitaura, and its fragmentation ratios increased with distance from the lakeshore. The coexistence ratios of the two valve types of this species decreased with distance from the lakeshore and from macrophytic vegetation. Planothidium lanceolatum, a fluvial benthic species, was abundant at the three northernmost sites near a river mouth, and the frustules of this species were seldom separated. These results suggest that long-distance transport promotes fragmentation and separation of benthic diatom valves in shallow lakes.

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现代浅湖沉积物中硅藻瓣膜的碎裂与分离:日本北浦湖案例研究
我们研究了日本北浦湖(一个浅水湖泊)表层沉积物中硅藻瓣膜碎裂和瓣叶分离的情况,以弄清沉积过程是如何影响硅藻群的。2014 年在北浦湖采集了 22 份表层沉积物样本。Aulacoseira spp.是特征性浮游类群,Cocconeis placentula和Planothidium lanceolatum是特征性底栖类群,两者都具有单瓣。最丰富的分类群 Aulacoseira 属的破碎率近岸高于湖泊中部。附生物种 Cocconeis placentula 在基陶拉湖中分布广泛,其破碎率随距离湖岸的远近而增加。该物种两种瓣膜类型的共存比率随着与湖岸和大型植被的距离而降低。Planothidium lanceolatum 是一种河流底栖物种,在靠近河口的最北端三个地点大量存在,该物种的瓣膜很少分离。这些结果表明,长距离迁移促进了浅水湖泊底栖硅藻瓣膜的破碎和分离。
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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
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