Abstract

Säkylän Pyhäjärvi (Sw Finland) is an Example of a Large and Shallow Lake Suffering from Eutrophication. during the Last 20 Years, the Quality and General Usability of Water in Pyhäjärvi Have Shown Considerable Variation Driven by Both a Variety of Human Activities and Climate-Related Factors Such as Wet and Dry Years. the Lake Has Been Thoroughly Studied for Decades and Has Been the Object of Comprehensive Restoration Activities Both in the Catchment and in the Lake Since the 1990s. Large Variety of Water Protection Measures Like Wetlands, Sedimentation Ponds and Filtering Systems Have Been Implemented in the Catchment Area to Reduce External Nutrient Load. Another Important Tool for Pyhäjärvi Restoration is Biomanipulation, Done by Local Commercial Fishermen in Winter. Twenty-Five Percent of the Annual Phosphorus Input is Removed with Fish Catch. Currently, Restoration Work is Facing New Challenges: Short or Even Nearly Missing Ice Cover Period and Increased Wintertime Nutrient Load from the Catchment. in the 2000s, There Were 3 Years with Exceptionally Short Ice Period, Allowing Only Brief Winter Seining Periods. Consequently, the Biomanipulation Catch Was Very Low in 2007 and 2008 Leading to Observable Food Web Effects. Phosphorus Load Was Especially High in Winters 2006/2007 and 2008/2009. on the Basis of the Data of 1987-2008, We Have Tested the Hypothesis If Climate-Related Wintertime Variables Like Phosphorus Load, Air Temperature and Precipitation Would Affect the Water Quality of the Lake in Following Summer, Here Measured as Chlorophyll a Concentration in the Lake Water. a Linear Model Has Been Used and a Validation Procedure Has Been Performed to Select the Best Variables. Our Results Indicate Some of the Linkages between Climate-Related Catchment Processes and the Ecological Status of the Lake. © Springer Science business Media B.v. 2010.

Department(s)

Engineering Management and Systems Engineering

Comments

European Regional Development Fund, Grant None

Keywords and Phrases

Biomanipulation; Climatic effects; Eutrophication; External nutrient load; Lake management; Length of ice cover

International Standard Serial Number (ISSN)

1573-5117; 0018-8158

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Springer, All rights reserved.

Publication Date

01 Feb 2011

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