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Effects of open marsh water management on numbers of larval salt marsh mosquitoes

Journal of Medical Entomology

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Abstract

Open marsh water management (OMWM) is a commonly used approach to manage salt marsh mosquitoes than can obviate the need for pesticide application and at the same time, partially restore natural functions of grid-ditched marshes. OMWM includes a variety of hydrologic manipulations, often tailored to the specific conditions on individual marshes, so the overall effectiveness of this approach is difficult to assess. Here, we report the results of controlled field trials to assess the effects of two approaches to OMWM on larval mosquito production at National Wildlife Refuges (NWR). A traditional OMWM approach, using pond construction and radial ditches was used at Edwin B. Forsythe NWR in New Jersey, and a ditch-plugging approach was used at Parker River NWR in Massachusetts. Mosquito larvae were sampled from randomly placed stations on paired treatment and control marshes at each refuge. The proportion of sampling stations that were wet declined after OMWM at the Forsythe site, but not at the Parker River site. The proportion of samples with larvae present and mean larval densities, declined significantly at the treatment sites on both refuges relative to the control marshes. Percentage of control for the 2 yr posttreatment, compared with the 2 yr pretreatment, was >90% at both treatment sites.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of open marsh water management on numbers of larval salt marsh mosquitoes
Series title:
Journal of Medical Entomology
Volume
46
Issue:
6
Year Published:
2009
Language:
English
Publisher:
Entomological Society of America
Publisher location:
Washington, D.C.
Contributing office(s):
Patuxent Wildlife Research Center
Description:
8 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Medical Entomology
First page:
1392
Last page:
1399
Number of Pages:
8
Country:
United States
State:
New Jersey;Massachusetts