Rehabilitation of Delavan Lake, Wisconsin
作者:
DaleM. Robertson,
GeraldL. Goddard,
DanielR. Helsel,
KevinL. MacKinnon,
期刊:
Lake and Reservoir Management
(Taylor Available online 2000)
卷期:
Volume 16,
issue 3
页码: 155-176
ISSN:1040-2381
年代: 2000
DOI:10.1080/07438140009353961
出版商: Taylor & Francis Group
关键词: eutrophication;lake restoration;biomanipulation;phosphorus
数据来源: Taylor
摘要:
A comprehensive rehabilitation plan was developed and implemented to shift Delavan Lake, Wisconsin, from a hypereutrophic to a mesotrophic condition. The plan was threefold: (1) reduce external phosphorus (P) loading by applying Best Management Practices in the watershed, enhance an existing wetland, and short-circuit the inflows through the lake, (2) reduce internal P loading by treating the sediments with alum and removing carp, and (3) rehabilitate the fishery by removing carp and bigmouth buffalo and adding piscivores (biomanipulation). The first and second parts of the plan met with only limited success. With only minor reductions in internal and external P loading, P concentrations in the lake returned to near pre-treatment concentrations. The intensive biomanipulation and resulting trophic cascade (increased piscivores, decreased planktivores, increased large zooplankton populations, and reduced phytoplankton populations) eliminated most of the original problems in the lake (blue-green algal blooms and limited water clarity). However, now there is extensive macrophyte growth and abundant filamentous algae. Without significantly reducing the sources of the problems (high P loading) in Delavan Lake, the increased water clarity may not last. With an improved understanding of the individual components of this rehabilitation program, better future management plans can be developed for Delavan Lake and other lakes and reservoirs with similar eutrophication problems.
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