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Mosquitoes vs. Plankton:
Can Native Zooplankton Control Mosquitoes?

This pilot project aims to determine whether native freshwater copepods in Talbot and Dorchester Counties can feed on the mosquito larvae that breed in ponds and containers. Our research seeks to answer three questions:

  1. What mosquitoes are found in Talbot and Dorchester counties?
  2. What species of native copepods eat larval mosquitoes?
  3. Can we these native copepods effectively control mosquitoes?

We will focus on container breeding mosquitos that are found in places where standing water exists and for which we have already developed methods for their capture.


Mosquitos are abundant on the Eastern Shore during warmer weather. Local governments and property owners exert great time, effort, and funding resources to control their populations. The State of Maryland currently monitors for the occurrence of a variety of mosquito borne diseases, including Zika Virus, eastern equine encephalitis virus, West Nile virus, and St. Louis encephalitis and others occurring in mosquitoes, wild birds, domestic animals and humans. Thus, mosquito control is an issue that affects the quality of life for everyone on the Eastern Shore, particularly for those who enjoy the outdoors, and also plays a key role in public health. Current control efforts are largely focused on spraying larvicides that kill mosquito eggs and larvae, with some other programs aimed at targeting adults in certain places. These sprays are often not specific to mosquitos, and thus can adversely affect many other members of the ecosystem. Additionally, invasive species of mosquito compete with native species, and often can affect the transmission of disease and pollination in ways that may also upset the ecosystem 

In some places, more ecologically safe and conservation-oriented control agents are employed, in which fish and birds eat larval and adult stages of the mosquito.  The efficacy of these strategies is still under scrutiny, but two other states have been working on using crustacean zooplankton called copepods because some copepod species are known to eat larval mosquitos. Copepods are a diverse group of animals that are found in nearly all bodies of water, from the deep ocean to high alpine lakes, and they may be the most abundant group of animals on earth.

The images below are of a male and female Acanthocyclops robustus, a species of freshwater copepod that was isolated from ponds in Talbot County, MD, and that we now have in culture at HPL. Preliminary experiments showed that these copepods will eat mosquito larvae, but that they are somewhat picky eaters, prefering some species of larve over others. Stay tuned for more in this space!

Acanthocyclops robustus female Acanthocyclops robustus male
Acanthocyclops robustus female (left) and male (right). Photo credit: Catherine Fitzgerald. Click on image for full size.

Support for the pilot project provided by the Waterfowl Chesapeake Communities in Conservation funding program.

James J. Pierson, Ph.D.
Associate Professor

2020 Horns Point Rd.
Cambridge, MD 21613


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