Temporal and spatial changes in milfoil distribution and biomass associated with weevils in Fish Lake, WI

Jester, Laura L. and Bozek, Michael A. and Helsel, Daniel R. and Sheldon, Sallie P. (2000) Temporal and spatial changes in milfoil distribution and biomass associated with weevils in Fish Lake, WI. Journal of Aquatic Plant Management, 38, pp. 98-104.

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Official URL: http://www.apms.org/japm/vol38p98.pdf

Abstract

During the course of an eight year monitoring effort, the Wisconsin Department of Natural Resources documented a significant decline in milfoil biomass and distribution in Fish Lake, Wisconsin. Average milfoil biomass declined by 40- 50% from 374-524 g dw m -2 during 1991-93 to 265 g dw m -2 during both 1994 and 1995. Milfoil recovered fully in 1996- 98 to 446- 564 g dw m -2 . The size of the milfoil bed, as discerned from aerial photographs, shrank from a maximum coverage of 40 ha in 1991 to less than 20 ha during 1995. During the “crash” of 1994-95, milfoil plants exhibited typical signs of weevil-induced damage, including darkened, brittle, hollowed-out growing tips, and the arching and collapse of stems associated with loss of buoyancy. Monitoring of weevils and stem damage during 1995-98 showed highest densities and heaviest damage occurred near shore and subsequently fanned out into deeper water from core infestation sites each spring. The extent of milfoil stem damage was positively correlated with weevil densities (monthly sampling). However, weevil densities and stem damage were lower during 1995 (when milfoil biomass was in decline) than during 1996-98 (when milfoil biomass was fully recovered).

Item Type: Article
Title: Temporal and spatial changes in milfoil distribution and biomass associated with weevils in Fish Lake, WI
Personal Creator/Author:
CreatorsEmail
Jester, Laura L.
Bozek, Michael A.
Helsel, Daniel R.
Sheldon, Sallie P.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 38
Page Range: pp. 98-104
Date: 2000
Latitude: 43.2872
Longitude: 89.6522
Issuing Agency: Aquatic Plant Management Society, Inc.
Additional Information: July 2000 Special Issue: The Use of Native Insect Herbivores for the Management of Eurasian Watermilfoil
Uncontrolled Keywords: Euhrychiopsis lecontei , Eurasian watermilfoil, Myriophyllum spicatum , decline, biological control, Fish Lake, Wisconsin
Subjects: Management
Biology
Limnology
Item ID: 1846
Depositing User: Stephanie Haas
Date Deposited: 16 Feb 2009 02:34
Last Modified: 29 Sep 2011 19:58
URI: http://aquaticcommons.org/id/eprint/1846

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