Seasonal Changes in Chemical Composition of Eurasion Watermilfoil (Myriophyllum spicatum L.) and Water Temperature at Two Sites in northern California: implications for Herbivory

Spencer, David F. and Ksander, Gregory G. (1999) Seasonal Changes in Chemical Composition of Eurasion Watermilfoil (Myriophyllum spicatum L.) and Water Temperature at Two Sites in northern California: implications for Herbivory. Journal of Aquatic Plant Management, 37, pp. 61-66.

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Official URL: http://www.apms.org/japm/vol37/v37p61.pdf

Abstract

We compared seasonal changes in Eurasian watermilfoil (Myriophyllum spicatum L.) characteristics and water temperature for a shallow poind in Davis, CA, and the Truckee River, near Tahoe City, CA. Tissue C and N were 15% lower in plants from the Truckee River than in plants from the Davis pond. Seasonal fluctuations in tissue N were also different. Mean phenolic acid content of Truckee River palnts (162yM g-1) was less than those from the shallow pond (195 yM g-1). Phenolic acid content was positively related to tissue C for Truckee River and Davis pond plants and, tissue C:N ratio for Truckee River plants. Mean monthly water temperature (1990 to 1998) for the Truckee River site was less than 20 C. Water temperatures were warmer in August and September at this site. However, Eurasian watermilfoil collected during these months was characterized by lower levels of tissue N. During a 29-month period beginning January 1994, mean monthly water temperature for the Davis pond exceeded 20 C, only during July to September 1995. Tissue N was generally greater during summer for watermilfoil growing in the pond. These results imply that Eurasian watermilfoil biological control agents may have different developmental rates in these habitats, and thus different impacts on watermilfoil populations.

Item Type: Article
Title: Seasonal Changes in Chemical Composition of Eurasion Watermilfoil (Myriophyllum spicatum L.) and Water Temperature at Two Sites in northern California: implications for Herbivory
Personal Creator/Author:
CreatorsEmail
Spencer, David F.
Ksander, Gregory G.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 37
Page Range: pp. 61-66
Date: 1999
Issuing Agency: Aquatic Plant Management Society, Inc.
Uncontrolled Keywords: Eurasian watermilfoil; Myriophyllum spicatum; aquatic weed, tissue C; tissue N; phenolic acids; Truckee River; California
Subjects: Conservation
Biology
Environment
Item ID: 1763
Depositing User: Natalie Wiest
Date Deposited: 27 Nov 2008 15:54
Last Modified: 29 Sep 2011 20:05
URI: http://aquaticcommons.org/id/eprint/1763

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