Japanese Lakes

Asaeda, Takashi; Shinohara, Ryuichiro

doi:10.1007/978-1-4020-4410-6_249

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…Understanding the mechanisms behind the interaction between water movements and plant communities are particularly important for planning criteria that would be of benefit in aquatic ecosystem managements. Lake Shinji, situated on the eastern side of Shimane Prefecture, Japan, is a shallow brackish-water system having an ecologically important reed belt along their coast (Asaeda, Shinohara, 2012;Horinouchi et al, 2008). To add to our knowledge on flow plant interactions in aquatic ecosystems, the present study examined the ecological significance of water turbulence in relation to plant, sediment and the dissolved oxygen in the reed community (P. australis) of the Shinji Lake.…”

Section: Introductionmentioning

confidence: 99%

Effects of water turbulence on plant, sediment and water quality in reed (Phragmites australis) community

Atapaththu

Asaeda

Yamamuro

et al. 2017

Ekológia (Bratislava)

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Atapaththu K.S.S., Asaeda T., Yamamuro M., Kamiya H.: Effects of water turbulence on plant, sediment and water quality in reed (Phragmites australis) community. Ekológia (Bratislava), Vol. 36, No. 1, p. 1-9, 2017. Even though the interaction between water movements and aquatic plant is crucial for the aquatic ecosystem management, the importance of water turbulence in this regard is not well documented. To add to our knowledge on the interaction between aquatic plant communities and water turbulence, this study examined turbulence, plant, sediment and water quality at the reed community (Phragmites australis) in the Lake Shinji, Japan. Observations were conducted along transects perpendicular to the shoreline. For each transect, reed communities were observed at land ward side, centre, water ward and the outside of the reed community. An elevated level of turbulence was observed outside compared to inside reed community, where the magnitude of turbulence decreased with distance into the community interior. A significant positive correlation was observed for turbulence and surface-dissolved oxygen where the latter was negatively correlated to reed density. Sediment composition was affected by water turbulence where the content of coarse particles positively correlated to turbulence. Accumulation of organic matter in anoxic sediments together with fine particles was observed under low turbulence. Our findings can offer insight into understanding the interactions between turbulence and aquatic plant communities.

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Section: Introductionmentioning

confidence: 99%

Effects of water turbulence on plant, sediment and water quality in reed (Phragmites australis) community

Atapaththu

Asaeda

Yamamuro

et al. 2017

Ekológia (Bratislava)

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Recent anthropogenic impact in ancient Lake Ohrid (Macedonia/Albania): a palaeolimnological approach

Lorenschat¹,

Zhang

Anselmetti

et al. 2014

J Paleolimnol

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Ancient lakes, which are important centres of biodiversity and endemism, are threatened by a wide variety of human impacts. To assess environmental impact on ancient Lake Ohrid we have taken short sediment cores from two contrasting site locations, comprising a site of urban pollution and an apparently pristine area. Recent impacts on water quality and ecology were assessed using sediment, geochemical, ostracode, and diatom data derived from analysis of two 210 Pb-dated sediment cores spanning the period from 1918 to 2009. According to the index of geoaccumulation, sediments were often moderately contaminated with As. Fe and Ni concentrations often exceeded reported maximum limits above which harmful effects on sediment-dwelling organisms are expected. Productivity in the (pristine) south-eastern part of Lake Ohrid (Sveti Naum) is generally lower than in the north, probably due to the strong influence of spring discharge. Low ostracode and diatom concentrations, low abundance of the epilimnetic diatom Cyclotella ocellata, and low values of TOC and TIC indicate a lower productivity from the early 1920s to the late 1980s. Since the mid 1970s, increased relative abundance of C. ocellata and increasing diatom concentration indicate increasing productivity in the south-eastern part. Rising numbers of ostracode valves and higher TIC and TOC contents in both sediment cores indicate an increase in productivity during the late 1980s. A slight increase in productivity near Sveti Naum continued from the early 1990s until 2009, witnessed by rising TC, TIC, and TOC content and a generally high number of ostracode valves and ostracode diversity. The area near the City of Struga (site of urban pollution) is also characterized by rising TOC and TIC contents and, furthermore, by increasing Cu, Fe, Pb, and Zn concentrations since the early 1990s. The recent reduction in the number of ostracode valves and ostracode diversity is probably caused by a higher heavy metal load into the lake. This suggests that living conditions for the endemic species in Lake Ohrid have become less favourable in the northern part of the lake, which might threaten the unique flora and fauna of Lake Ohrid.Keywords (separated by '-') Lake Ohrid -Palaeolimnology -Eutrophication -Geochemistry -Ostracodes -DiatomsFootnote Information Electronic supplementary material The online version of this article

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Japanese Lakes

Cited by 2 publications

References 20 publications

Effects of water turbulence on plant, sediment and water quality in reed (Phragmites australis) community

Effects of water turbulence on plant, sediment and water quality in reed (Phragmites australis) community

Recent anthropogenic impact in ancient Lake Ohrid (Macedonia/Albania): a palaeolimnological approach

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