Thursday, June 9, 2011

Not-So-Effective Pest Control

There are two species of mosquitofish found in the United States, western mosquitofish (Gambusia affinis) and eastern mosquitofish (Gambusia holbrooki). They are very small fishes, with adults less than 3 inches in length. As the name suggests, mosquitofish eat mosquito larvae, along with plankton, small invertebrates, and larval fish. Because of their diet, they have been widely introduced around the world to control diseases like malaria that are associated with mosquitoes.

The native range of the mosquitofish is not well known because human introductions started in the early 1900s. The two species were likely restricted to Gulf and Atlantic coastal plains and the lower Mississippi River Valley. Due to the broad spectrum of their diet and water quality tolerance, mosquitofish are habitat “generalists” that are able to flourish in a wide range of conditions. These traits, combined with their high reproductive rate and frequent dispersal by humans, have resulted in two species that are very successful invaders.



Western Mosquitofish (Gambusia affinis). From http://www.issg.org/database/image.asp?ii=1636&ic=e

Despite their small size, invasive mosquitofish can have a big impact on their environment. Introductions of mosquitofish can lead to algal blooms if they have consumed the zooplankton that keeps algae under control. They can cause populations of native fishes to go extinct through competition for food and direct aggression. They also carry parasites that infect native fish. Worst of all, research has shown that mosquitofish are no more effective at controlling mosquito populations than native mosquito predators. They can even increase the size of mosquito populations by feeding on or outcompeting the mosquito’s native predators.

Mosquitofish can be a problem here in Tennessee because they threaten the Barrens topminnow (Fundulus julisia). This fish occurs in only in three counties in Tennessee and is part of our natural heritage. Unfortunately, the larvae of the Barrens topminnow are eaten by the mosquitofish, and larger juveniles have to compete with the invasive species for food. The Tennessee Aquarium Conservation Institute is currently reintroducing Barrens topminnows to springs with where mosquitofish have been excluded in order to prevent negative impacts from this invasive species.



6 comments:

Charisma Combestra said...

Pest control plays a very important role in the prevention of diseases for it helps in the elimination of this pest.

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Advancedpest management said...

This article delves with the impact of a pest control company on the environment. It gives tips and suggestions about how the community at large can help to do as little damage as possible to the environment.

southernutahpestcontrol said...

A pest control company can determine the source of your home or commercial property's infestation. Their methods of fumigation can also eradicate the problem and prevent future issues.

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Jimmy Smith said...

It quiet most effectiveness sharing, it really very valuable for us.

regards
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Marcus Wheeler said...

Finally, a proper preparation of the bed bug infested home is an essential element of getting rid of bed bugs. Decluttering, moving of the furniture away from the walls by about a foot, emptying of dresser drawers and removal of light switch and electrical outlet cover plates and propping up of the mattresses and box springs are necessary to give the bed bug exterminator proper access to areas that must be treated.

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buyket said...


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وفي مجال القضاء علي الحشرات بمختلف انواعها بالرياض وفرنا
اما ما يخص مدينتي الخرج وجدة مكافحة حشرات بالخرج
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شركة مكافحة الحمام
وايضا في مجال رش الدفان رش دفان بالرياض