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Landscape and Ecological Engineering : Volume 3

Landscape and Ecological Engineering : Volume 2

Landscape and Ecological Engineering : Volume 1

Effects of submerged plants on water quality and biota in large-scale experimental ponds

Content Provider	Springer Nature Link
Author	Nakamura, Keigo Kayaba, Yuichi Nishihiro, Jun Takamura, riko
Copyright Year	2007
Abstract	We quantitatively studied the effect of submerged plants on water quality and biota under fish-free conditions for 3 weeks in four large freshwater experimental ponds (533 m$^{3}$ per pond) at the Aqua Restoration Research Center, Japan. Two artificially harvested ponds with scant vegetation were used as “harvested ponds” (H1, H2), and the other two ponds, which were naturally dominated by Hydrilla verticillata, were used as “vegetated ponds” (V1, V2). The PVI (percent water volume infested with macrophytes) was employed as an index of vegetation abundance. Vegetated ponds had much clearer water than harvested ponds. The water quality in H2 (PVI 10%) was better than in H1 (PVI 3%), whereas the water quality did not differ significantly between the two vegetated ponds (V1, PVI 38% and V2, PVI 84%). Therefore, the threshold between clear water and turbidity was between 10 and 38% in PVI. Our result also showed that a turbid water state was created shortly after harvest. Green algae were abundant in the harvested ponds, and diatoms were dominant in the vegetated ponds. Rotifers were stably dominant in the harvested ponds. Aquatic worms were more abundant in the harvested ponds than in the vegetated ponds. Unexpectedly, zooplanktons were much less abundant in the vegetated ponds; therefore, zooplankton grazing was not the main mechanism behind the cleaner water in our experiment. These results are physical evidence that the presence of dense macrophytes was the main factor in the creation of a clear water state.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	18601871
Journal	Landscape and Ecological Engineering
Volume Number	4
Issue Number	1
e-ISSN	1860188X
Language	English
Publisher	Springer Japan
Publisher Date	2007-11-28
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Submerged macrophytes Aquatic plants Shallow lake Alternative stable state PVI Plant Ecology Landscape/Regional and Urban Planning Environmental Management Civil Engineering Nature Conservation Landscape Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Management, Monitoring, Policy and Law Nature and Landscape Conservation

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