Title

The Effects Of Vegetation Removal By Grass Carp And Herbicides On The Water Chemistry Of 4 Florida Lakes

Comments

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Abbreviated Journal Title

Freshw. Biol.

Keywords

Marine & Freshwater Biology

Abstract

Four lakes in central Florida each received a different weed control treatment consisting of herbicide and/or different stocking ratios of grass carp (Ctenopharyngodon idella Val.).
Submersed vegetation was eliminated by grass carp within 6 months In Lake Orienta and within 14 months in Clear Lake. Because Little Lake Fairview, treated with herbicide and a smaller stocking ratio of grass carp, retained abundant vegetation levels over the first two study years, grass carp which had been introduced initially were replaced with a greater number of fish at the beginning of the third year. Submersed vegetation was subsequently eliminated in this lake within LO months. Aquatic vegetation was reduced but not eliminated in Lake Mann which was treated with herbicide only.

Where macrophytes were removed there tended to be increased bottom dissolved oxygen, higher and more stable total alkalinity values, increased turbidity, lowered transparency, higher specific conductivity and increased chlorophyll levels. Significant increases in pH were probably due to low water levels resulting from a severe drought rather than weed control. Low water also affected specific conductivity. Annual means for nutrients did not differ significantly between years in the four lakes.

Journal Title

Freshwater Biology

Volume

15

Issue/Number

5

Publication Date

1-1-1985

Document Type

Article

Language

English

First Page

587

Last Page

596

WOS Identifier

WOS:A1985ASE8000007

ISSN

0046-5070

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